Hitachi RAS-(3-6)HVNC1(E) Service Manual
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Hitachi RAS-(3-6)HVNC1(E) Service Manual

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Table of Contents

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UTOPIA IVX PREMIUM / IVX STANDARD SERIES
H(V)N(P/C)(1)(E)

Service Manual

RAS-(2-6)HVNP1(E)
RAS-(4-12)HNP(1)(E)
RAS-(3-6)HVNC1(E)
RAS-(4-12)HNC(1)(E)

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Summary of Contents for Hitachi RAS-(3-6)HVNC1(E)

  • Page 1: Service Manual

    UTOPIA IVX PREMIUM / IVX STANDARD SERIES H(V)N(P/C)(1)(E) Service Manual RAS-(2-6)HVNP1(E) RAS-(4-12)HNP(1)(E) RAS-(3-6)HVNC1(E) RAS-(4-12)HNC(1)(E)
  • Page 3 Contents General information Unit Installation Piping work and refrigerant charge Electrical wiring Control System Optional functions Test run Troubleshooting Spare parts Servicing Electrical checks of main parts Maintenance notes SMGB0087 rev.0 - 12/2013...
  • Page 5 General index General index General information ....................1 1.1 General information ............................ 2 1.1.1 General notes ..............................2 1.1.2 Introduction ..............................2 1.1.3 Environment-friendly units ..........................3 1.2 Safety................................4 1.2.1 Applied symbols .............................. 4 1.2.2 Norms and Regulations ........................... 4 1.3 Product guide.............................. 5 1.3.1 Classification of outdoor unit models .......................
  • Page 6 General index Piping work and refrigerant charge ............... 61 3.1 General notes before performing pipe work ..................... 62 3.1.1 Piping Materials ............................. 62 3.1.2 Three principles on refrigerant piping work ....................64 3.1.3 Suspension of refrigerant piping ........................64 3.1.4 Brazing work ..............................65 3.2 Piping connection for outdoor unit ......................66 3.2.1 RAS-(2-2.5)HVNP1 / RAS-3HVNC1 ......................
  • Page 7 General index 4.3.2 Function of the of DIP switches and RSW switches ..................103 4.3.3 Jumpers ............................... 107 4.3.4 LED’s indication ............................107 4.4 Electrical settings ............................ 108 4.4.1 Outdoor and indoor unit electrical wiring ..................... 108 4.4.2 Wire size ..............................109 4.5 H-LINK II system............................111 4.5.1 Features ...............................111 4.5.2 Specifications ...............................111...
  • Page 8 General index 5.4.4 Automatic cooling and heating operation ....................151 5.4.5 Defrost operation control ..........................152 5.5 Standard control functions ........................155 5.5.1 Freezing protection during cooling process or dry operation ..............155 5.5.2 Prevention control for high pressure increase during cooling operation ............. 156 5.5.3 Prevention control for excessively high discharge gas temperature ............
  • Page 9 General index 8.2.1 Alarm display ............................... 216 8.2.2 Alarm codes for the outdoor and indoor units ....................217 8.2.3 Troubleshooting by alarm code for the outdoor and indoor units ..............219 8.2.4 Alarm codes for the KPI (E/H/X)3E Series and DX Interface ..............275 8.3 Troubleshooting in check mode ......................
  • Page 10 General index 9.6.3 Parts name ..............................341 9.7 RAS-12HN(P/C)............................344 9.7.1 Cycle and structural parts ..........................344 9.7.2 Electrical parts (3Φ 400V/50Hz) ........................345 9.7.3 Parts name ..............................346 10. Servicing ......................... 349 10.1 Safety Introduction ..........................353 10.2 RAS-(2-2.5)HVNP1 and RAS-3HVNC1 ....................354 10.2.1 Removing pipe cover ..........................
  • Page 11 General index 10.4.7 Removing the compressor ........................376 10.4.8 Removing the High pressure switch and Pressure switch for control ............378 10.4.9 Opening electrical box (P plate) ........................ 379 10.4.10 Removing Reversing valve coil ....................... 379 10.4.11 Removing electronic expansion valve coil ....................379 10.4.12 Removing solenoid valve coil (SVA and SVC) ..................
  • Page 12 General index 10.6.15 Removing other electrical components ....................410 10.7 RAS-(4-6)H(V)NC1E..........................411 10.7.1 Removing service cover ..........................411 10.7.2 Remove outlet grille ............................411 10.7.3 Removing upper cover ..........................411 10.7.4 Removing bottom service cover and rear cover ..................412 10.7.5 Removing outdoor fan motor ........................412 10.7.6 Removing electrical box ..........................
  • Page 13 General index 10.9.6 Removing electrical box ..........................442 10.9.7 Removing the compressor ........................443 10.9.8 Removing High pressure switch and pressure switch for control .............. 446 10.9.9 Opening electrical box (P-Mounting Plate) ....................446 10.9.10 Removing reversing and solenoid valves coils ..................447 10.9.11 Removing electronic expansion valve coil ....................
  • Page 14 General index 12.2 Maintenance work..........................475 12.3 Service and maintenance record ......................476 12.4 Service and maintenance record using the 7-segment display ............477 12.5 Service and maintenance record by remote control switch ..............479 12.6 Pump-down method for replacing the compressor ................480 SMGB0087 rev.0 - 12/2013...
  • Page 15 1 General information G e n e r a l i n f o r m a t i o n Index 1.1. General information ..........................2 1.1.1. General notes .............................. 2 1.1.2. Introduction ..............................2 1.1.3. Environment-friendly units ........................... 3 1.2.
  • Page 16 Indoor Units One of the main merits of Hitachi units range is the combinability and flexibility of its indoor units SYSTEM FREE. This outs- tanding technology makes possible to use the same indoor units with both UTOPIA and SET FREE outdoor units, making easier the design, installation and control of the air conditioning installations.
  • Page 17 1 General information 1.1.3  Environment-friendly units This range of HITACHI outdoor units uses environmentally-friendly R410A gas refrigerant, and the RoHS and Green Dot regulations are applied throughout the manufacturing and installation process to reflect HITACHI’s awareness of environmental respect and commitment.
  • Page 18 1 General information 1.2 Safety 1.2.1  Applied symbols During normal air conditioning system design work or unit installation, greater attention must be paid in certain situations requiring particular care in order to avoid damage to the unit, the installation or the building or property. Situations that jeopardise the safety of those in the surrounding area or that put the unit itself at risk will be clearly indicated in this manual.
  • Page 19 1 General information 1.3 Product guide 1.3.1  Classification of outdoor unit models    IVX series Unit type (Outdoor unit): RAS Position-separating hyphen (fixed) Capacity (HP): 2, 2.5, 3, 4, 5, 6, 8, 10, 12 H = Heat pump V = Single phase unit (1~ 230V 50Hz) - = Three phase unit (3N~ 400V 50Hz) N = R410A refrigerant P: Premium series...
  • Page 20 1 General information 1.3.3  Product guide: Outdoor units    IVX Premium 1~ 230V 50Hz 3N~ 400V 50Hz Unit Code Unit Code Unit Code Unit Code Unit Code RAS-2HVNP1 60288615 RAS-2.5HVNP1 60288616 RAS-3HVNP1E 7E304018 RAS-4HVNP1E 7E304020 RAS-4HNP1E 7E304120 RAS-5HVNP1E 7E304021 RAS-5HNP1E 7E304121 RAS-6HVNP1E 7E304022 RAS-6HNP1E 7E304122 RAS-8HNPE 7E310110...
  • Page 21 1 General information 1.3.4  Outdoor unit accessory code list OU Ref: All models RAS-(2.0/2.5)HVNP1 / RAS-3HVNC1 RAS--3HVNP1E RAS-(4-6)HVNC1E RAS-(4-6)H(V)NPE / RAS-(8-10)HN(P/C)E RAS-12HN(P/C) Name Description Code Figure Ref. DBS-26 Drain discharge connection 60299192 AG-264 Air flow guide 60209100 d, c, AG-335A Air flow guide 60291431 f, g WSP-264 Wind guard...
  • Page 22 Snow protection hood; air inlet of left side (Stainless plate) ASG-SP10LE Snow protection hood; air inlet of left side (Steel plate) ASG-SP10LES Snow protection hood; air inlet of left side (Stainless plate) N O T E HITACHI has a range of accessories and remote control systems that can be used with the UTOPIA outdoor units. Please, refer to the Controls Technical Catalogue. SMGB0087 rev.0 - 12/2013...
  • Page 23 1 General information 1.3.5  Product guide: Indoor units & complementary systems    RCI and RCIM indoor units FSN(2/3)(E)(i) indoor units RCIM 4-way cassette 4-way cassette (compact) Unit Code Unit Code Unit Code Unit Code RCI-1.0FSN3Ek 7E404001 RCIM-0.8FSN3 60278172 RCI-1.0FSN3Ei 7E403014 RCI-1.0FSN3 60278119 RCI-1.5FSN3Ek 7E404002 RCIM-1.0FSN3 60278173 RCI-1.5FSN3Ei 7E403015 RCI-1.5FSN3 60278120 RCI-2.0FSN3Ek...
  • Page 24 1 General information    RCD and RPC indoor units FSN2(E) indoor units 2-way cassette Ceiling type Ceiling type Unit Code Unit Code Unit Code Unit Code RCD-1.0FSN2 (*) 60278029 RCD-1.5FSN2 (*) 60278030 RPC-1,5FSN3 60278164 RCD-2.0FSN2 (*) 60278031 RPC-2.0FSN3E 7E443003 RPC-2.0FSN3 60278165 RCD-2.5FSN2 (*) 60278032 RPC-2.5FSN3E 7E443004 RPC-2.5FSN3...
  • Page 25 1 General information    RPC, RPI and RPIM indoor units FSN(3/4)E indoor units RPIM Indoor ducted unit Unit Code Unit Code Unit Code RPIM-0.8FSN4E 7E430013 RPI-0.8FSN4E 7E424013 RPIM-0.8FSN4E-DU 7E431013 RPIM-1.0FSN4E 7E430014 RPI-1.0FSN4E 7E424014 RPIM-1.0FSN4E-DU 7E431014 RPIM-1.5FSN4E 7E430015 RPI-1.5FSN4E 7E424015 RPIM-1.5FSN4E-DU 7E431015 RPI-2.0FSN4E 7E424016 RPI-2.5FSN4E 7E424017 RPI-3.0FSN4E...
  • Page 26 1 General information    RPK, RPF and RPFI indoor units FSN(H)(2/3)(E/M) indoor units RPFI Wall type Floor type Floor concealed type Unit Code Unit Code Unit Code RPK-0.8FSN3M 60278146 RPK-0.8FSNH3M 60278154 RPF-1.0FSN2E 7E450001 RPFI-1.0FSN2E 7E460001 RPK-1.0FSN3M 60278147 RPK-1.0FSNH3M 60278155 RPF-1.5FSN2E 7E450002 RPFI-1.5FSN2E 7E460002 RPK-1.5FSN3M 60278148 RPK-1.5FSNH3M...
  • Page 27 1 General information 1.3.7  Product line-up: DX-Interface DX-Interface Unit Code EXV-2.0E1 7E610900 EXV-2.5E1 7E610901 Control box EXV-3.0E1 7E610902 EXV-4.0E1 7E610903 EXV-5.0E1 7E610904 EXV-6.0E1 7E610905 Expansion valve box EXV-8.0E1 7E610906 EXV-10.0E1 7E610907 SMGB0087 rev.0 - 12/2013...
  • Page 29 2 Unit Installation U n i t I n s t a l l a t i o n Index 2.1. Safety summary ............................ 16 2.2. Transportation of outdoor unit ....................... 17 2.3. Center of gravity ............................ 18 2.4. Factory-supplied accessories for RAS-12HN(P/C) ................19 2.5.
  • Page 30 2 Unit Installation 2.1 Safety summary D A N G E R • Install the outdoor unit with sufficient clearance around it for operation and maintenance as shown in the next pages. • Install the outdoor unit where good ventilation is available. • Do not install the outdoor unit where exists a high level of oil mist, salty air or sulphurous atmosphere. • Install the outdoor unit as far as practical (being at least 3 meters) from electromagnetic wave radiator such as medical equipment. • Keep clearance between units of more than 50 mm and avoid obstacles that could hamper air intake when installing more than one unit together. • Install the outdoor unit in the shade or not exposed to direct sunshine or direct radiation from high tempera- ture heat source. • Do not install the outdoor unit in a place where a seasonal wind directly blows into the outdoor fan. • For cleaning use non-inflammable and nontoxic cleaning liquid. Use of inflammable agent may cause explo- sion or fire. • Work with sufficient ventilation. Working in an enclosed space could cause oxygen deficiency. Toxic gas may be produced when cleaning agent is heated to high temperature by e.g. being exposed to fire. • Cleaning liquid shall be collected after cleaning. • Pay attention to do not clamp cables when attaching the service cover to avoid electric shock or fire. C A U T I O N • Check the foundation to be flat leveled and strongly enough.
  • Page 31 2 Unit Installation 2.2 Transportation of outdoor unit D A N G E R Do not put any foreign material into the outdoor unit and check to ensure that none exists in the outdoor unit before the installation and test run. Otherwise a fire or failure will occur. C A U T I O N Transport the products as close to the installation location as practical before unpacking. Hanging Method When hanging the unit ensure the balance of the unit check safety and lift it up smoothly. Do not remove any packing ma- terials and hang the unit under packing condition with two ropes as shown below.
  • Page 32 2 Unit Installation 2.3 Center of gravity Hanging Method When hanging the unit ensure the balance of the unit check safety and lift it up smoothly. Do not remove any packing materials and hang the unit under packing condition with two ropes as shown below. At leat two persons are needed to move the unit.
  • Page 33 2 Unit Installation a. 660 mm RAS-12HNP b. 200 mm RAS-12HNC h. 680 mm 1 Center of gravity 2.4 Factory-supplied accessories for RAS-12HN(P/C) Make sure that the following accessories are packed with the unit. Accessory Quantity Product Fiche Declaration of conformity 2.0 - 4.0 Energy Label Transportation Label Installation and operation manual...
  • Page 34 2 Unit Installation 2.5 Installation space (Initial ckeck) N O T E The following images are for illustration purposes only. 2.5.1  Basic sizes    RAS-2HVNP1 - RAS-2.5HVNP1 - RAS-3HVNC1 ≥ ≥    RAS-(4-6)H(V)NC1E)     All models (except RAS-2HVNP1 - RAS-2.5HVNP1 - RAS-3HVNC1 - RAS-(4-6)H(V)NC1E) Units in mm. SMGB0087 rev.0 - 12/2013...
  • Page 35 2 Unit Installation 2.5.2  RAS-(2-2.5)HVNP1 / RAS-3HVNC1 a) In case of front side and either of the sides are open b) In case that surrounding wall exist (single unit) (single unit) 1000 c) In case that upper side obstacles exist (single unit) ≤ 0 < L ≤ 1/2 H A ≥ 500 1/2 H < L ≤ H A ≥ 1000 e) In case of front side and either of the sides are open d) In case that upper side obstacles exist (serial units) (serial units) ≤ 300 0 < L ≤ 1/2 H A ≥...
  • Page 36 2 Unit Installation 2.5.3  RAS-(3-12)H(V)NP(1)(E) / RAS-3HVNC1 / RAS-12HNC (Unit: mm) Blocked in Inlet Side Upper Side Open Single Installation Multiple Installation (Two units or more) 200 or more of the back space is acceptable when the right and Allow 100 mm of space between units. Leave open both right and left sides are open.
  • Page 37 2 Unit Installation Outlet Side Blocked Upper Side Open Single Installation Multiple Installation (Two units or more) Allow 100 mm of space between units. Both right and left sides shall be open. Be sure to use the fan direction guide. Allow 100 mm of space Be sure to use the fan direction guide.
  • Page 38 2 Unit Installation Stack installation (allowed up to 2 Units) Upper Side Open Single Installation Multiple Installation Allow 100 mm of space between units. Serial sideways installa- Close the part A not to allow the outlet air bypassed. Install to tion allowed up to two units. Leave open both right and left sides. avoid the drain water from upper unit falling on the lower unit.
  • Page 39 2 Unit Installation 2.5.4  RAS-(4-6)H(V)NC1E (Unit: mm) Blocked in Inlet Side Upper Side Open Single Installation Multiple Installation (Two units or more) Front Side Upper Side Blocked Single Installation Multiple Installation (Two units or more) Outlet Side Blocked Upper Side Open Single Installation Multiple Installation (Two units or more) SMGB0087 rev.0 - 12/2013...
  • Page 40 2 Unit Installation Outlet Side Blocked Right and Left Blocked Upper Side Open Upper Side Blocked Single Installation Multi-Row and Multiple Installations When using airflow guide (AG-335A, op- Mount the airflow guide and provide sufficient space on both right and left sides tional), check that the discharged air is not short-circuited to the air inlet side When L >...
  • Page 41 2 Unit Installation 2.6 Place provision    Concrete foundation • Foundation could be on flat and it is recommended to be 100-300 mm higher than ground level. • Install a drainage around foundation for smooth drain. • When installing the outdoor unit fix it by M10 anchor bolts. •...
  • Page 42 2 Unit Installation Drain hole Position for drain boss (optional) (30x80) (30x80) (228) 1. Drain hole (30x80) 2. Drain hole (3-30x80) 4-R8 Front side 3 The whole of the base of the outdoor unit should be installed on a foundation. When using vibration-proof mat it should also be positioned the same way.
  • Page 43 2 Unit Installation 2.6.2    P lace provision for RAS-3HVNP1E / RAS-(4-6)H(V)N(P/C)1E / RAS-(8-10)HN(P/C)E /   RAS-12HN(P/C) Metal plate for RAS-3HVNP1E / RAS-(4-6)H(V)N(P/C)1E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C) 1 Outdoor unit. 2 Cut this portion of bolt. If not it’s difficult to remove Service cover. 3 Mortar hole (Ø100 x Depth 150). 4 Anchor bolt M10 (Ø12.5 Hole). 5 Drainage (Wide 100 x Depth 150). 6 Drainage.
  • Page 44 2 Unit Installation Recommended Metal Plate Size • (Field-Supplied) Material: Hot-Rolled Mild Steel. 4-C10 • Plate (SPHC) Plate Thickness: 4.5 T. RAS-3HVNP1E Model RAS-(4-6)H(V)N(P/C)1E RAS-12HN(P/C) RAS-(8-10)HN(P/C) A (mm) (560) B (mm) Example of fixing outdoor unit by anchor bolts 1. Max. 21 mm (After cut “A”) 2.
  • Page 45 2 Unit Installation    Suspended unit 1 Suspend the unit as shown in the figures. 2 Ensure that wall can withstand the weight of the outdoor unit indicated on the specifications plate. 3 It is advisable that each foot support should bear the full weight of the unit (in order take account of applied stress fatigue when unit is operating).
  • Page 46 2 Unit Installation 2.7 Optional parts and installation 2.7.1  Optional parts and installation for RAS-(2-2.5)HVNP1 / RAS-3HVNC1    Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-264 Wind guard WSP-264 Air outlet ASG-NP80F Zinc Plate Air inlet of rear side ASG-NP56B Air inlet of side face ASG-NP56L Air outlet ASG-NP80FS2 Air inlet of rear side ASG-NP63B52 Snow protection...
  • Page 47 2 Unit Installation Locations of fixing holes The holes Location shall be made by using self-screws (M4x13) and later shall be used SUS screw (M5x12) for fixing air flow guide. 1.Outdoor Unit 2.Hole (4 locations) One flow guide installation 1.Air discharge grille 2.Air flow 3.Outdoor unit 4.M5 fixing screw x4 (Accessories) 5.Air flow guide Service space (In case of upward air discharge)
  • Page 48 2 Unit Installation    Wind guard Specifications Model WSP-264 Quantity 1 per unit Material Galvanized sheet metal + baked painting Color UTOPIA Beige Weight 4.0 kg Fixing screw x 4 [M5 (SUS) x 30]- Unit Accessories Fixing Screw x 10 [M5 (SUS) x 12]- Wind Ward Installation manual Installation “Guard net”...
  • Page 49 2 Unit Installation    Snow protection hood Air discharge hood Nº Part name Quantity Right side plate Left side plate Front panel Fixing screw (Accessories) Hole for safety wire rope to prevent overturning Rear suction hood Nº Part name Quantity Right side plate Left side plate Upper front panel (Upside) Upper front panel (Downside).
  • Page 50 2 Unit Installation Attaching example of snow protection hood 1. Fixing screw (accessories) 2. Air inlet hood 3. Wire rope (optional for over turning protection) 4. Air discharge hood 5. Outdoor unit A. Rear side B. Left side C Front side N O T E The holes locations marked with a mark shall be made by using sel screw (M4X13) and later shall be used SUS Screw for fixing protection hood.
  • Page 51 2 Unit Installation 2.7.2  Optional parts and installation RAS-3HVNP1E     Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-335A Wind guard WSP-335A Air outlet ASG-NP335F Zinc plate Air inlet of rear side ASG-NP80B Air inlet of side face ASG-NP80L Air outlet ASG-NP335F52 Air inlet of rear side ASG-NP160BS2 Snow protection hood...
  • Page 52 2 Unit Installation One flow guide installation 1.Air discharge grille 2.Air flow 3.Air flow guide 4.Outdoor unit 5.M5 fixing screw x4 (Accessories) Service space (In case of upward air discharge) • In case of right and left sides air discharge enough space for air discharge is required. • The downward air discharge is also available. In such case install the base under the unit to secure enough space for air discharge.
  • Page 53 2 Unit Installation Attaching example of air wind guard • Attach the air flow guide to the air discharge grille with four (4) screws (supplied). • The fixing holes are located at 4 positions on the grille. (Screw tightening torque 2.4 3.1 N.m) • Do not remove the air discharge grille for air flow guide installation. C A U T I O N If the air guide is installed without discharge grille it may cause injury due to rotating fan.
  • Page 54 2 Unit Installation    Snow protection hood Air discharge hood Nº Part name Quantity Right side plate Left side plate Front panel Stay Fixing screw (Accessories) Hole for safety wire rope to prevent overturning Rear suction hood Nº Part name Quantity Right side plate Left side plate Upper front panel (Upside) Upper front panel (Downside) Fixing screw (Accessories)
  • Page 55 2 Unit Installation Attaching example of snow protection hood 1. Fixing screw (Accessories). 2. Rear suction hood 3. Wire rope (Optional. For overturning protection) 4. Air discharge grille 5. Left suction hood 6. Air discharge hood A. Left side B. Front side C. Rear side Specifications of snow protection hood Product name Air discharge hood...
  • Page 56 2 Unit Installation 2.7.3  Optional parts and installation RAS-(4-6)H(V)NC1E     Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-335A Wind guard WSP-335A Air outlet ASG-NP335F Zinc plate Air inlet of rear side ASG-NP80B Air inlet of side face ASG-NP80L Air outlet ASG-NP335F52 Air inlet of rear side ASG-NP160BS2 Snow protection hood...
  • Page 57 2 Unit Installation One flow guide installation 1.Air discharge grille 2.Air flow 3.Air flow guide 4.Outdoor unit 5.M5 fixing screw x4 (Accessories) Service space (In case of upward air discharge) • In case of right and left sides air discharge enough spa- ce for air discharge is required. • The downward air discharge is also available. In such case install the base under the unit to secure enough space for air discharge.
  • Page 58 2 Unit Installation    Wind guard Specifications Model WSP-335A Quantity 1 per unit Galvanized sheet metal + Material baked painting Color Gray (1.0Y8.5/0.5) Weight 5.5 kg Fixing screw Accessories x 4 [M5 (SUS) x 12] Installation manual Installation “Guard net” “Air flow guide” or “Snow protection restriction hood”...
  • Page 59 2 Unit Installation One windguard cover installation 1.Air discharge grille 2.Wind guard 3.Air discharge grille 4.Outdoor unit 5.M5 fixing screw x4 (Accessories) Service space • Both sides of the outdoor unit should be open. • No obstacles should be placed in the air discharge side. 1.Min.
  • Page 60 2 Unit Installation    Snow protection hood Air discharge hood Nº Part name Quantity <500> Right side plate Left side plate φ8 Front panel Stay Fixing screw (Accessories) Hole for safety wire rope to prevent overturning <500> Nº Part name Quantity 2 x φ8 4 x φ7 <520>...
  • Page 61 2 Unit Installation Left suction hood Nº Part name Quantity <300> Right side plate Left side plate Front panel (Upside) Front panel (Downside) Fixing hole x 2 Fixing screw (Accessories) Enlarged view of A (Fixing Hole) Nº Part name Quantity <300> Right side plate Left side plate Front panel (Upside) Front panel (Downside)
  • Page 62 2 Unit Installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood ASG-NP335F1 ASG-NP335FS3 Model ASG-SP10BE ASG-SP10BES ASG-5P10LE ASG-SP10LES ASG-SP11FB ASG-SP11FBS Quantity 1 unit Bonderized Bonderized Bonderized Stainless Stainless Stainless Material steel sheet steel sheet steel sheet (NSSC 180) (NSSC 180) (NSSC 180) Iron Iron Iron Gray...
  • Page 63 2 Unit Installation 2.7.4  Optional parts and installation RAS-(4-6)H(V)NPE / RAS-(8-10)HN(P/C)E    Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-335A X 2 Wind guard WSP-335A X 2 Air outlet ASG-NP335F X 2 Zinc plate Air inlet of rear side ASG-NP280B Air inlet of side face ASG-NP280L Air outlet ASG-NP335FS 2X 2...
  • Page 64 2 Unit Installation Two flow guides installation 1.Air discharge grille 2.Air flow 3.Air flow guide (see the note) 4.Outdoor Unit 5.M5 fixing screw x4 (Accessories) N O T E Air flow direction of both air flow guides should be the same. Service space (In case of upward air discharge) • In case of right and left sides air discharge enough space for air discharge is required.
  • Page 65 2 Unit Installation Attaching example of air wind guard • Attach the air flow guide to the air discharge grille with four (4) screws (supplied). • The fixing holes are located at 4 positions on the grille. (Screw tightening torque 2.4 3.1 N.m) • Do not remove the air discharge grille for air flow guide installation. C A U T I O N If the air guide is installed without discharge grille it may cause injury due to rotating fan.
  • Page 66 2 Unit Installation    Snow protection hood Air discharge hood Nº Part name Quantity Right side plate Left side plate Front panel Stay Fixing screw (Accessories) Hole for safety wire rope to prevent overturning Rear suction hood Nº Part name Quantity Right side plate Left side plate Upper front panel (Upside) Upper front panel (Downside) Fixing screw (Accessories)
  • Page 67 2 Unit Installation Attaching example of snow protection hood 1. Left suction hood 2. Fixing screw (Accessories) 3. Rear suction hood Upper side 4. Wire rope (Optional. For overturning protection) 5. Rear suction hood Lower side 6. Air discharge hood 7. Air discharge grille 8. Air discharge grille A.
  • Page 68 2 Unit Installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood Model ASG-NP335F ASG-NP335FS2 ASG-NP280B ASG-NP280BS2 ASG-NP280L ASG-NP280LS2 Quantity 2 per unit 1 per unit Bonderized Bonderized Bonderized Stainless Stainless Stainless Material steel sheet steel sheet steel sheet (NSSC 180) (NSSC 180) (NSSC 180) Iron Iron Iron...
  • Page 69 2 Unit Installation 2.7.5  Optional parts and installation RAS-12HN(P/C)    Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-335A X 2 Wind guard WSP-335A X 2 Air outlet ASG-NP335F X 2 Zinc plate Air inlet of rear side ASG-NP335B Air inlet of side face ASG-NP335L Air outlet ASG-NP335FS2 X 2...
  • Page 70 2 Unit Installation Two flow guides installation 1.Air discharge grille 2.Air flow 3.Air flow guide (see the note) 4.Outdoor Unit 5.M5 fixing screw x4 (Accessories) N O T E Air flow direction of both air flow guides should be the same. Service space (In case of upward air discharge) • In case of right and left sides air discharge enough space for air discharge is required.
  • Page 71 2 Unit Installation Attaching example of air wind guard • Attach the air flow guide to the air discharge grille with four (4) screws (supplied). • The fixing holes are located at 4 positions on the grille. (Screw tightening torque 2.4 3.1 N.m) • Do not remove the air discharge grille for air flow guide installation. C A U T I O N If the air guide is installed without discharge grille it may cause injury due to rotating fan.
  • Page 72 2 Unit Installation Air discharge hood Nº Part name Quantity Right side plate Left side plate Front panel Stay Fixing screw (Accessories) Hole for safety wire rope to prevent overturning Rear suction hood Nº Part name Quantity Right side plate Left side plate Upper front panel (Downside) Upper front panel (Upside) Fixing screw (Accessories) Hole for safety wire rope to prevent overturning...
  • Page 73 2 Unit Installation Attaching example of snow protection hood 1100 1. Left suction hood 2. Fixing screw (Accessories) 3. Rear suction hood Upper side 4. Wire rope (Optional. For overturning protection) 5. Air discharge hood 6. Air discharge grille 7. Rear suction hood Lower side 8.
  • Page 74 2 Unit Installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood Model ASG-NP335F ASG-NP335FS2 ASG-NP335B ASG-NP335BS2 ASG-NP335L ASG-NP335LS2 Quantity 2 per unit 1 per unit Bonderized Bonderized Bonderized Stainless Stainless Stainless Material steel sheet steel sheet steel sheet (NSSC180) (NSSC180) (NSSC180) Iron Iron Iron Gray Gray...
  • Page 75 3 Piping work and refrigerant charge P i p i n g w o r k a n d r e f r i g e r a n t c h a r g e Index 3.1. General notes before performing pipe work ..................62 3.1.1.
  • Page 76 3 Piping work and refrigerant charge 3.1 General notes before performing pipe work 3.1.1  Piping Materials 1 In order to avoid supply problems in terms of local regulations and quality, prepare locally-supplied copper pipes. N O T E In case of using copper pipes for piping sections bigger than Ø19.05 mm (3/4 inches), flaring work cannot be performed. If necessary, use a joint adapter. 2 Select the piping size with the correct thickness and correct material able to withstand sufficient pressure. 3 Select clean copper pipes.
  • Page 77 3 Piping work and refrigerant charge C A U T I O N • Cap the end of the pipe when pipe is to be inserted through a wall hole. • Do not put pipes on the ground directly without a cap or vinyl tape at the end of the pipe. • If piping installation is not completed until next day or over a longer period of time, braze off the ends of the piping and charge with oxygen free nitrogen through a Schrader valve type access fitting to prevent moisture and particle conta- mination. • Do not use insulation material that contains NH3, as it can damage copper pipe material and become a source of future leakage. • Insulate the unions and flare-nuts at the piping connection part completely. • Completely insulate both refrigerant gas and liquid piping between the indoor unit and the outdoor unit to avoid a de- crease of performance; if not, dew will occur on the piping surface. • Refrigerant circuit and Water circuit must be performed and inspected by a licensed technician and must comply with all relevant European and national regulations.  Insulation Attach the pipe insulation to each branch using vinyl tape. Attach also insulation to field supplied pipes in order to prevent the capacity decrease according to the ambient air conditions and dewing on the low pressure pipe surface.
  • Page 78 3 Piping work and refrigerant charge 3.1.2  Three principles on refrigerant piping work In case of using refrigerant R410A in the refrigeration cycle, the refrigeration oil should be of a synthetic type one. In order to avoid oxidation, pay much careful attention to basic piping work control to avoid infiltration of moisture or dust during the refrigerant piping work.
  • Page 79 3 Piping work and refrigerant charge 3.1.4  Brazing work The most important work in the refrigerant piping installation work is the brazing of the pipes. If it accidentally occurs a leakage due to a careless brazing process, it will cause clogged capillary pipes or serious compressor failure. In order to guarantee a proper brazing neck between different pipes surfaces, accurate pipe dimensions after the expan- sion process (see the table below): It is important to control the clearance of the pipe fitting portion as shown below.
  • Page 80 3 Piping work and refrigerant charge 3.2 Piping connection for outdoor unit 3.2.1  RAS-(2-2.5)HVNP1 / RAS-3HVNC1 1 Take the piping cover away from the unit. Then fetch the pipes through the rear side and route piping according to the installation place as shown in the figure. Make holes by cutting along the guideline at the rear of the cover or punching with a driver.
  • Page 81 3 Piping work and refrigerant charge 3.2.2  RAS-3HVNP1E / RAS-(4-6)H(V)N(P/C)1E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C) 1 The pipes can be connected from 4 directions. Make holes in the piping cover or cabinet for taking out pipes. Nº Description  Rear side piping work  Pipe Cover  Right side piping work Bottom side piping work ...
  • Page 82 3 Piping work and refrigerant charge  For the front and side piping Select the correct knock-out size depending on whether it is for power wiring or transition wiring Right-SIde Piping Hole RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E RAS-12HN(P/C) Front-SIde Piping Hole Front piping hole Front piping hole Right side piping hole Rigth side piping hole...
  • Page 83 3 Piping work and refrigerant charge  For the rear side piping After removing the rear-side piping cover, punch out the “A” holes along the guide line. Rear Cover N O T E Remove the rear pipe cover under the rear cover and remove part following the slit. 2 Mount the piping cover in order to avoid water entering into the unit. Seal the holes where pipes and wires are inserted, by using insulation (field-supplied).
  • Page 84 3 Piping work and refrigerant charge 3.2.3  Outdoor unit stop valve 1 Remove the stop valve cap before performing the air tight test after connecting the flare nut. Tighten the spindle valve in clockwise according to the following table “Tightening Torque of Stop Valves.” 2 Tighten the flare nut according the specified torque.
  • Page 85 3 Piping work and refrigerant charge Hexagonal wrench size used for spindle valve: (*) Size 2HP, 2.5HP 3HP, 4-6HP Standard 4-6 HP Premium, 8-12HP Gas valve 4 mm 5 mm Liquid valve 4 mm 4 mm 4 mm Do not apply two spanners at this position. If applied, leakage will occur.
  • Page 86 3 Piping work and refrigerant charge 3.3 Refrigerant piping range 3.3.1  Refrigerant piping length The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart. Keep the design point within the area of the chart, which is showing the applicable height difference according to piping length.
  • Page 87 3 Piping work and refrigerant charge  Maximum refrigerant piping length IVX Premium series Outdoor Unit 2HP 2.5HP 3HP 10HP 12HP Maximum piping length Actual Length (L) between the outdoor unit and the farthest indoor Equivalent Length (EL) unit 2 units (A+B+C) Total piping length 3 units (A+B+C+D) 4 units (A+B+C+D+E+F) 4 and 3 units (B+C+D) Maximum piping line after 4 units (B+D, B+E, C+F, first branch C+G) Main piping length A A > B, C, D, E, F, G Maximum height difference Outdoor / Indoor (H) 30 / 20 (Outdoor Unit is Higher / Lower.) Maximum height difference Indoor / Indoor...
  • Page 88 3 Piping work and refrigerant charge IVX Standard series Outdoor Unit 10HP 12HP Maximum piping length bet- Actual Length (L) ween the outdoor unit and the Equivalent Length (EL) farthest indoor unit 2 units (A+B+C) 3 units (A+B+C+D) Total piping length 4 units (A+B+C+D+E+F+G+) 2 and 3 units (B, C, D) Maximum piping line after first 4 units branch (B+D, B+E, C+F, C+G) Main piping length A A > B, C, D, E, F, G Maximum height difference Outdoor / Indoor (H) 30 / 20 (Outdoor Unit is Higher / Lower) Maximum height difference Indoor / Indoor Maximum height difference: branch pipe/Indoor (2,3 and 4 indoor units system) branch pipe/branch pipe (4 indoor units system)
  • Page 89 3 Piping work and refrigerant charge 3.3.3  Piping system for line branch 3 HP 4 HP 5 HP 6 HP 8 HP 10 HP 12 HP IVX Premium 2 -3 2 - 5 2 - 6 2 - 8 IU quantity allowed IVX Standard 2 - 4 (picture is as example)  Maximum refrigerant piping length (Line branch system) IVX Premium series Outdoor Unit 10HP 12HP Maximum piping length between the...
  • Page 90 3 Piping work and refrigerant charge 3.3.4  Combinations of piping size and piping length IVX Premium series Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.60 Ø22.20 Ø25.40 Ø28.60 Perfor- mance capacity 2 HP 2.5 HP 3 HP (1)(2) 4 -5-6 HP (3) (4) 8 HP (1)(4) (1)(3)
  • Page 91 3 Piping work and refrigerant charge 3.3.5  Refrigerant piping size and multikit/distributor selection C A U T I O N • Do not use refrigerant pipe sizes other than those indicated in this Technical Catalogue. The diameter of the refrigerant pipes depends directly on the outdoor unit capacity. • If larger diameter gas refrigerant pipes are used, the circuit lubrication oil tends to separate from the gas carrying it. The compressor will be seriously damaged due to a lack of lubrication. • If smaller diameter gas refrigerant pipes are used, the gas or liquid refrigerant will have serious difficulties in circulating. System performance will be affected. The compressor will run under more severe conditions than foreseen and will be damaged in a short space of time. Select the piping connection sizes according to the following procedures • Between outdoor unit and branch pipe: Select the same pipe connection size as the pipe size of the outdoor unit. •...
  • Page 92 ≥ 2.3 HP Ø15.88 Ø9.52 =4HP: TE-04N1 not possible ≥ 5HP: TE-56N1 If the capacity ratio between IU group 1+2 and 3+4 is higher than 60/40% please install a line branch system or contact with your Hitachi Dealer. SMGB0087 rev.0 - 12/2013...
  • Page 93 3 Piping work and refrigerant charge Line branch system Multi-kit model A Multi-kit model B (mm) Pipe Size (D) Outdoor Unit IVX Premium IVX Standard IVX Premium IVX Standard Series Series Series Series Liquid 3 / 4 / 5 / 6 Ø15.88 Ø9.52 E-102SN(2/3) E-102SN(2/3) E-102SN(2/3) E-102SN(2/3) Ø25.40 Ø9.52(1) E-162SN(2/3) E-162SN(2/3) E-102SN(2/3) E-102SN(2/3) 10 /12 Ø25.40 Ø12.70...
  • Page 94 3 Piping work and refrigerant charge 3.3.6  System installation N O T E • Pipe connection size on outdoor units, indoor units and the multikit or distributor vary according to the system. • The sizes of the indoor and outdoor units could be different. Adjust the flare adapter (accessory) to the indoor pipe connection in these cases.  Height difference between indoor units and distributor It is recommended to install all indoor units at the same height. When the height difference between the indoor units due to building construction is necessary, this should be less than the value indicated in the table.
  • Page 95  Installing Distributor 1 Install the distributor supplied by HITACHI on request. A tee can not be installed instead of a branch pipe. 2 Installing the distributor Fix the branch pipe horizontally to the pillar, wall or ceiling. Piping must not be fixed rigidly to the wall as thermal expansion and contraction can cause pipe fracture.
  • Page 96 3 Piping work and refrigerant charge 3.3.7  Connecting flare adapter Flare nut (accessories) Pipe (accessories) Indoor unit Liquid line Pipe (field supplield) Gas line Flare adapter (accessories) The piping sizes for indoor unit and outdoor unit are different. Attach the flare adapter (accessories) at the indoor piping union part.
  • Page 97 3 Piping work and refrigerant charge 3.4 Refrigerant charge C A U T I O N • Do not charge OXYGEN, ACETYLENE, or other flammable and poisonous gases into the refrigerant, as an explosion could occur. It is recommended that oxygen free nitrogen be charged for these types of test cycles when performing a leakage test or an airtight test. These types of gases are extremely dangerous. • Insulate the unions and flare-nuts at the piping connection part completely. • Insulate the liquid piping completely to avoid a decreased performance; if not, it will cause sweating on the surface of the pipe. • Charge refrigerant correctly following the procedures of the manuals. Overcharging or insufficient charging could cause a compressor failure.Insulate the unions and flare-nuts at the piping connection part completely. • Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difficult breathing. • If the flare nut is tightened too hard, the flare nut may crack after a long time and cause refrigerant leakage. Follow the next procedure to charge the R410A refrigerant inside the indoor unit: 1 Connect the gauge manifold using charging hoses with a nitrogen cylinder to the outdoor unit check joints of the liquid line and the gas line stop valves.
  • Page 98 3 Piping work and refrigerant charge 3.4.1  Caution of the pressure by check joint When the pressure is measured, use the check joint of gas stop valve (A), and use the check joint of liquid piping (B) in the figure below. At that time, connect the pressure gauge according to the following table because of high pressure side and low pressure side changes by operation mode.
  • Page 99 3 Piping work and refrigerant charge IVX Standard series Refrigerant charge before Additional refrigerant charge Maximum additional Chargeless length Model shipment (W (kg)) (P) (g/m) charge (kg) RAS-3HVNC1 RAS-4HVNC1E RAS-5HVNC1E RAS-6HVNC1E RAS-4HNC1E RAS-5HNC1E RAS-6HNC1E RAS-8HNCE 10.3 RAS-10HNCE 12.1 RAS-12HNC 12.1 (1) For 2 indoor units system configuration, the chargeless length is considered to be 0 m. (2) Calculated multiplying a constant factor.
  • Page 100 3 Piping work and refrigerant charge  Additional refrigerant charge calculation method Calculate the additional refrigerant charge amount according to the following steps: Step 1: Additional refrigerant charge calculation for liquid piping (W  (kg)) Outdoor units have been charged with refrigerant for 30m (20m for RAS-3HVNC) of actual piping length, an additional refrigerant charged is required in systems with actual piping length longer. a. For all UTOPIA units except RAS-(8-12)HN(P/C)(E) Use the following formula: = (L-30) x P (*)
  • Page 101 3 Piping work and refrigerant charge Step 2: Additional refrigerant charge calculation for indoor unit (W  (kg)) When the outdoor unit is combined with indoor units RPI-(8/10)HP allowed (1 unit system combination only), it´s necessary an additional refrigerant charge (W ) = 1kg/unit. For indoor units lower than 8 HP, an additional refrigerant charge it’s not needed.
  • Page 102 3 Piping work and refrigerant charge  Pump down refrigerant When the refrigerant should be collected into the outdoor unit due to indoor/outdoor unit relocation, collect the refrigerant as follows: 1 Attach the manifold gauge to the gas stop valve and the liquid stop valve. 2 Turn ON the power source.
  • Page 103 3 Piping work and refrigerant charge 3.5 Caution in case of refrigerant leakage The installers and those responsible for drafting the specifications are obliged to comply with local safety codes and regu- lations in the case of refrigerant leakage. 3.5.1  Maximum permitted concentration of hydrofluorocarbon (HFC) The refrigerant R410A, charged in the UTOPIA series system, is an incombustible and non-toxic gas. However, if leakage occurs and gas fills a room, it may cause suffocation.The maximum permissible concentration of HFC gas, R410A in air is 0.44 kg/m , according to EN378-1.
  • Page 104 3.6.2  When existing air-conditioner is a product of another manufacturer Existing pipes made by other manufacturer can also be used if the following conditions satisfied: 1 For systems with several indoor units, branch pipes shall be changed to Hitachi-specified model. 2 Please perform a pipe cleaning. SMGB0087 rev.0 - 12/2013...
  • Page 105 3 Piping work and refrigerant charge 3   P ermissible range for existing air-conditioning pipes (pipe length in the case of “without  cleaning process” IVX Premium series Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88 Thickness (mm) Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58 Thickness (mm) Material soft- annealed Material drawn...
  • Page 106 3 Piping work and refrigerant charge 3.6.3  Renewal kit selection model Hitachi offers, as an accessory, a renewal kit:  Recommended renewal kit Renewal Kit Renewal Kit External Attachment Internal Attachment External attachment Internal attachment to Outdoor Unit to Outdoor Unit to outdoor unit IVX Premium IVX Standard to outdoor unit...
  • Page 107 3 Piping work and refrigerant charge Model TRF-NP160U Pipe For liquid pipe Pipe connecting Pipe connecting port for I.U port for O.U (Flare connection) (Flare connection) For gas pipe Pipe connecting Pipe connecting port for I.U port for O.U (Flare connection) (Flare connection) O.U.: Outdoor Unit I.U.: Indoor Unit...
  • Page 108 3 Piping work and refrigerant charge  Renewal kit installation (Example) RAS-(2/2.5)HVNP1 RAS-3HVNC1 RAS-(4-6)H(V)NP1E RAS-8HN(P/C)E RAS-10HN(P/C)E RAS-12HV(P/C) RAS-(2/2.5)HVNP1 - RAS-3HVNC1 Field-Supplied pipes (with insulation) Strainer for liquid pipe (with accessory insulation) Put tape on insulation crossover Existing refrigerant pipes Strainer for gas pipe Put tape on insulation crossover (with accessory insulation) RAS-3HVNP Field-Supplied pipes...
  • Page 109 3 Piping work and refrigerant charge RAS-(4-6)H(V)NP1E - RAS-(8/10)HN(P/C)E Existing pipe (Outlet on the rear side) Flare connection Strainer for liquid pipe Strainer for gas pipe Flare connection Existing refrigerant Existing refrigerant pipe pipes (for liquid) (Outlet on the rear side) Existing refrigerant Existing refrigerant pipe pipes (for gas) (Outlet on the rear side)
  • Page 110 3 Piping work and refrigerant charge 3.7 Drain piping 3.7.1  Drain discharging boss When the base of the outdoor unit is temporarily utilized as a drain receiver and the drain water in it is discharged, this drain boss is utilized to connect the drain piping. Model Applicable Model RAS-(2/2.5)HVNP1...
  • Page 111 4 Electrical wiring E l e c t r i c a l w i r i n g Index 4.1. General notes ............................98 4.1.1. General check ............................98 4.2. Electrical wiring connection for the outdoor unit .................. 100 4.3.
  • Page 112 4 Electrical wiring 4.1 General notes C A U T I O N • Before any electrical wiring work or regular inspections, switch off the main power supply switches of the indoor and outdoor units. Wait three minutes before starting installation or maintenance work. • Make sure that the indoor and outdoor are completely stopped before starting work on the electrical wiring or regular inspections. • Protect cables, drain hose, electric parts, etc. from rodents and insects; otherwise these might damage unprotected components and, in the worst case, cause a fire. • Wrap the accessory packing around the wires, and plug the wiring connection hole with the seal material to protect the product from any condensed water and insects. • Do not allow cables to come into contact with the refrigerant pipes, metal edges, printed circuit boards (PCB) or the electric parts inside the unit; the cables may be damaged and, in the worst case, cause a fire. • Tightly secure the wires with the cord clamp inside the indoor unit. • Lead the wires through the knockout hole in the side cover when using conduit. • Secure the cable of the remote control switch with the cord clamp inside the electrical box. • Electrical wiring must comply with national and local codes. Contact your local authority in regards to standards, rules, regulations, etc. D A N G E R • Do not connect of adjust any wiring or connections unless the main power switch is OFF.
  • Page 113 4 Electrical wiring MODEL (Ω) MODEL (Ω) RAS-2HVNP1 RAS-2.5HVNP1 RAS-3HVNP1E RAS-3HVNC1 0.42 RAS-4HVNP1E RAS-4HVNC1E RAS-5HVNP1E RAS-5HVNC1E RAS-6HVNP1E RAS-6HVNC1E RAS-4HNP1E RAS-4HNC1E RAS-5HNP1E RAS-5HNC1E RAS-6HNP1E RAS-6HNC1E RAS-8HNPE RAS-8HNCE RAS-10HNPE RAS-10HNCE RAS-12HNP RAS-12HNC 3 Harmonics situation of each model regarding IEC 61000-3-2 and IEC 61000-3-12 is as follows: MODELS SITUATION REGARDING IEC 61000-3-2 and IEC 61000-3-12 MODEL RAS-2HVNP1...
  • Page 114 4 Electrical wiring 4.2 Electrical wiring connection for the outdoor unit The correct electrical wiring connection for the outdoor unit is shown below. 1 Connect the three-phase power supply source wires L1, L2, L3 and N (for 400V/50Hz) or L1 and N (for 230V/50Hz ) to the terminal board.
  • Page 115 4 Electrical wiring RAS-12HN(P/C) Power wires Earth Terminal Transmission wires 2 Connect the wires between the outdoor unit and the indoor unit to the terminals 1 and 2 on the terminal board. 1. Power supply 1~ 230V. 1. Power supply 3N~ 400V. 2.
  • Page 116 4 Electrical wiring 4.3 Setting the DIP switches for the outdoor unit 4.3.1  Quantity and position of DIP switches The PCB in the outdoor unit is operating with DIP switches and push switches. The location is as follows: RAS-(2/2.5)HVNP1 / RAS-3HVNC1 PCB2 PCB1 RAS-(3-12)H(V)N(P/C)(1)(E) N O T E DIP-IPM or PCB2 (depending on model) has a DSW1. When pin number 1 is set to ON position, the electrical current detections is canceled. Pin number 1 should be to OFF position after electrical work. SMGB0087 rev.0 - 12/2013...
  • Page 117 4 Electrical wiring 4.3.2  Function of the of DIP switches and RSW switches N O T E • The mark “■” indicates the position of dips switches. • No mark “■” indicates pin position is not affecting. • The figures show the settings before shipment or after selection. D A N G E R Before setting dips switches, first turn the power source off and then set the position of the dips switches. In case of setting the switches without turning the power source off, the contents of the setting are invalid.  DSW301 (Only RAS-(2/2.5)HVNP1 and RAS-3HVNC1 units): Test run mode Setting before shipment 1 2 3 4 5 6 Cooling Heating Forced stop of compressor ...
  • Page 118 4 Electrical wiring  DSW2: Pipe length setting (setting is required) / Optional function setting Setting before shipment Pipe length (≤5m) Pipe length setting should be performed as follows according to the on-site pipe length. Pipe length (≥30m) Cooling only Control to support existing pipes. When using Ø19,05 gas pipe (soft-annealed), switch ON DSW2 pin 4 in the outdoor unit PCB) Optional function setting mode (The optional function selection mode become available) 1 2 3 4 5 6...
  • Page 119 4 Electrical wiring  DSW4 / RSW1: Refrigerant cycle number setting (Setting is required) In case of using an H-Link II net it is required to set the refrigerant cycle number. Setting for the ten digit (Factory setting) 1 2 3 4 5 6 Setting position. Set by inserting slotted screwdriver into the groove (setting for the last digit) Rotary switche’s positions (RSW1) are set by inserting a screw driver into the groove.
  • Page 120 4 Electrical wiring Turn OFF DSW5 number 1 pin for cancel of end terminal resistance setting. Outdoor unit Outdoor unit Outdoor unit Outdoor unit DSW5 DSW5 DSW5 DSW5 Control wiring Control wiring Control wiring (H-LINK II or H-LINK) (H-LINK II or H-LINK) (H-LINK II or H-LINK) Indoor Indoor...
  • Page 121 4 Electrical wiring 4.3.3  Jumpers Jumper lead setting (JP1~6) Setting before shipment: System Single phase (1~) Three-phase (3N~) Only RAS-(2/2.5)HVNP and RAS-3HVNP N O T E • 0: Open • 1: Short circuit The function selection using the jumper lead setting is shown in the tables below: RAS-(2-2.5)HVNP / RAS-3HVNC Setting Function...
  • Page 122 4 Electrical wiring 4.4 Electrical settings 4.4.1  Outdoor and indoor unit electrical wiring • Connect the electrical wires (indoor unit and the outdoor unit) as show in the figure. • When installing the electrical wiring, follow local codes and regulations. • The refrigerant piping and the control wiring are connected to the units in the same refrigerant cycle. •...
  • Page 123 4 Electrical wiring 4.4.2  Wire size  Connection wiring Recommended minimum sizes for field provided wires: Power source cable size Transmitting cable size Model Power supply EN60 335-1 EN60 335-1 All Indoor Units 1~ 230V 50HZ 0.75 mm² 0.75 mm² IVX Premium Series RAS-2HVNP1 2.5 mm² RAS-2.5HVNP1 4.0 mm RAS-3HVNP1E 1~ 230V 50HZ RAS-4HVNP1E RAS-5HVNP1E 6.0 mm...
  • Page 124 4 Electrical wiring  Main switch protection Select the main switches in according to the next table: Model Power supply Max. current (A) CB (A) ELB (no.poles/A/mA) All Indoor Units 1~ 230V 50Hz 2/40/30 ELB: Earth switch; CB: Circuit breaker IVX Premium series IVX Standard series Outdoor unit MC (A) CB (A) Outdoor unit MC (A) CB (A) RAS-2HVNP1 12.0...
  • Page 125 4 Electrical wiring 4.5 H-LINK II system The H-LINK II is the wiring connection system between units. The H-LINK II wiring system only needs: • Two transmission wires connecting each indoor and outdoor unit for a total of 64 refrigerant cycles. • Connection wiring for all indoor and outdoor units in series.
  • Page 126 4 Electrical wiring 4.5.3  DIP Switch setting for twin, triple and quad systems Dip switch of indoor PCB and outdoor H-LINK II The DIP switches of all the indoor and outdoor units have to be set and the impedance of the transmission circuit adapted. • Example of the setting of the DIP switches. A: Cycle number 0. B: Cycle number 1.
  • Page 127 4 Electrical wiring Unit Name of DIP switch Mark Setting before the Shipment Function For setting the refrigerant cycle address of DSW4 the outdoor unit. Set the DSW4 and RSW1 to Refrigerant cycle RSW1 overlap the setting of other outdoor units in Outdoor the same H-LINK system. Unit To adapt the impedance of the transmission Resistance of terminal...
  • Page 128 4 Electrical wiring 4.5.5  Examples of H-LINK II system Two cases: 1. U sing H-LINK II system for air conditioning systems without a central control device (CSNET WEB or PSC-A64S). • Line connection with all units (including Utopia and/or Set Free, Mini Set Free and DC Inverter). A: Outdoor units.
  • Page 129 4 Electrical wiring • Connection with one main line and with the branch lines for the units. A: Outdoor units. B: Indoor units. C A U T I O N • The maximum number of units than can be connected is 64 outdoor units and 160 indoor units (including Utopia and/ or Set Free, Mini Set-free). • Do not install the wiring in a loop. • If the H-LINK II system is not used when carrying out the electrical wiring as shown above, it must be used once the wir- ing of the instrument is completed. The DIP switches must therefore be set as specified in the DIP switches on the PCB. 2. U sing the H-LINK II system for air conditioning systems with a central control device (CSNET WEB or PSC-A64S) •...
  • Page 130 4 Electrical wiring 4.6 System Control 4.6.1  Individual Operation Control wiring (H-LINK II) Indoor unit Outdoor unit DSW6 DIP switch 6 setting is NOT required. (The factory setting position is for the individual operation.) Remote control switch (PC-ART) Individual Thermo ON/OFF Operation The individual Thermo ON/OFF is available to be controlled each indoor unit even if multiple indoor units are controlled simultaneously by one remote control switch.
  • Page 131 4 Electrical wiring 4.6.2  Simultaneous Operation This unit can be operated simultaneously with twin, triple and quad combinations. One remote control switch (PC-ARF) can control without transition wiring up to 4 units of FSN2 series or later model types (H-LINK II supported models) simultaneously (Available if it is with the transition wiring.) Control wiring (H-LINK II) Indoor unit Outdoor unit...
  • Page 132 4 Electrical wiring 4.7 Electrical wiring diagrams 4.7.1  RAS-(2-2.5)HVNP1 / RAS-3HVNC1 (1~ 230V 50Hz) 7S139290 / 7S139291 /7S139294 SMGB0087 rev.0 - 12/2013...
  • Page 133 4 Electrical wiring Mark Name Mark Name Oil heater Motor for compressor Reactor MOF1 Motor for outdoor fan Inverter system power module Reversing valve relay Noise filter EFR1, EFS1, PF1,3 Fuse on PCB PSW1~3,351 Micro-computer control expansion DSW~6,301 Setting switch on PCB valve RSW1 Terminal board...
  • Page 134 4 Electrical wiring 4.7.3  RAS-3HVNP1E (1~ 230V 50Hz) XEK01261_0 SMGB0087 rev.0 - 12/2013...
  • Page 135 4 Electrical wiring MARK NAME MARK NAME Motor (for compressor use) Fan thermistor M0F1 Motor (for fan use Pressure sensor (discharge side) Power fuse High pressure switch (for protection) 4 way solenoid valve Low pressure switch (for control) Solenoid valve Reactor Electronic expansion valve DIP-IPM...
  • Page 136 4 Electrical wiring 4.7.4  RAS-(4-6)HVNP1E (1~ 230V 50Hz) XEK01262_1 SMGB0087 rev.0 - 12/2013...
  • Page 137 4 Electrical wiring MARK NAME MARK NAME THM9 Thermistor (for TD use) Motor (for compressor use) Fan thermistor M0F1,2 Motor (for fan use Pressure sensor (discharge side) Power fuse High pressure switch (for protection) 4 way solenoid valve Low pressure switch (for control) SVA,C Solenoid valve Reactor...
  • Page 138 4 Electrical wiring 4.7.6  RAS-(4-6)HNP1E (3N~ 400V 50Hz) XEK01263_2 SMGB0087 rev.0 - 12/2013...
  • Page 139 4 Electrical wiring MARK NAME MARK NAME THM9 Thermistor (for TD use) Motor (for compressor use) Pressure sensor (discharge side) M0F1,2 Motor (for fan use High pressure switch (for protection) EF1,2 Power fuse Low pressure switch (for control) 4 way solenoid valve Reactor SVA,C Solenoid valve...
  • Page 140 4 Electrical wiring 4.7.7  RAS-(4-6)HVNC1E (1~ 230V 50Hz) XEK01264_4 SMGB0087 rev.0 - 12/2013...
  • Page 141 4 Electrical wiring MARK NAME MARK NAME THM10 Thermistor (for condenser use) Motor (for compressor use) Fan thermistor M0F1 Motor (for fan use Pressure sensor (discharge side) Power fuse High pressure switch (for protection) 4 way solenoid valve Low pressure switch (for control) Solenoid valve Reactor Electronic expansion valve...
  • Page 142 4 Electrical wiring 4.7.8  RAS-(4-6)HNC1E (3N~ 400V 50Hz) XEK01265_4 SMGB0087 rev.0 - 12/2013...
  • Page 143 4 Electrical wiring MARK NAME MARK NAME THM9 Thermistor (for TD use) Motor (for compressor use) THM10 Thermistor (for condenser use) M0F1 Motor (for fan use High pressure switch (for protection) EF1,2 Power fuse Low pressure switch (for control) 4 way solenoid valve Reactor Solenoid valve DIP-IPM...
  • Page 144 4 Electrical wiring 4.7.10  RAS-(8-10)HN(P/C)E (3N~ 400V 50Hz) XEK01288_3 SMGB0087 rev.0 - 12/2013...
  • Page 145 4 Electrical wiring MARK NAME MARK NAME Reactor Motor (for compressor use) CB1,2 Capacitor M0F1,2 Motor (for fan use Inverter module EF1,2 Power fuse NF1-5 Noise filter 4 way solenoid valve PSW1 Switch (for forced defrosting use) SVA,C Solenoid valve PSW2 Switch (for checking use ()) Electronic expansion valve...
  • Page 146 4 Electrical wiring 4.7.12  RAS-12HN(P/C) (3N~ 400V 50Hz) 7T146440 SMGB0087 rev.0 - 12/2013...
  • Page 147 4 Electrical wiring MARK NAME MARK NAME PCB1-3 Printed circuit board Capacitor Sensor for refrigerant pressure CB1,2 Capacitor Pressure switch control Contactor for compressor motor High pressure switch for protection CS1,2 Capacitor PSW1-3 Push switch on PCB1 Reactor R1,2 Resistor Diode Module RS1,2 Resistor for starting...
  • Page 149 5 Control System C o n t r o l S y s t e m Index 5.1. Device control system ......................... 136 5.2. Outdoor units PCB ..........................138 5.2.1. RAS-(2-2.5)HVNP1 / RAS-3HVNC1 ......................138 5.2.2. RAS-3HVNP1E ............................139 5.2.3. RAS-(4-6)H(V)NP1E ..........................
  • Page 150 5 Control System 5.1 Device control system Purpose Control subject Cooling operation Heating operation Defrost operation The frequency control is determi- The frequency control is determi- ned with the next parameters: ned with the next parameters: Fixed frequency • • Ratio (IU capacity/OU capaci- Ratio (IU capacity/OU capaci- (For RAS-(2-2.5)HVNP1 and Control frequency of ty) for individual operation.
  • Page 151 5 Control System The figure below shows the outline of the control system Multiple signals Single signals Wireless remote control switch Thermistor for inlet air Suction gas pressure sensor Thermistor of discharge air Discharge gas pressure sensor Operation signals Thermistor for gas pipe Thermistor for outdoor temperature Thermistor for liquid pipe Discharge gas thermistor...
  • Page 152 5 Control System 5.2 Outdoor units PCB 5.2.1  RAS-(2-2.5)HVNP1 / RAS-3HVNC1 PCB1 PCB2 PCB1 Connector indication PCB1 LED indication Connector Name Colour Name PCN5 Crankcase heater of compressor (oil) LED1 Power source for the PCB PCN6 Reversing valve relay This LED indicates the transmission status LED2 Green between the indoor unit and the RCS PCN13 Pressure switch control This LED indicates the transmission status...
  • Page 153 5 Control System 5.2.2  RAS-3HVNP1E Connector indication Switch indication PCN1 Power supply connector DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN8 High pressure switch protection DSW3 Capacity code PCN9 Compressor contactor DSW4/ Refrigerant cycle number RSW1 PCN10 Low pressure switch protection DSW5...
  • Page 154 5 Control System 5.2.3  RAS-(4-6)H(V)NP1E Connector indication Connector indication PCN1 Power supply connector (1~only) CN404 Line connection between PCB and DIP-IPM CN405 Motor for fan 2 R1,N1,R2, Power supply and reverse phase detection (3N~ S2,T2 only) CN406 Motor for fan 1 PCN5 Crankcase heater of compressor (oil) EF1,2,3 Power protection...
  • Page 155 5 Control System 5.2.4  RAS-(4-6)H(V)NC1E Connector indication Connector indication PCN1 Power supply connector (1~only) CN404 Line connection between PCB and DIP-IPM R1,N1,R2, Power supply and reverse phase detection (3N~ CN406 Motor for fan S2,T2 only) EF1,2,3 Power protection PCN5 Crankcase heater of compressor (oil) EFR1 PCN6 4-way solenoid valve...
  • Page 156 5 Control System 5.2.5  RAS-(8-10)HN(P/C)E PCB1 PCB3 TAB4 TAB3 PCB1 Connector indication PCB1 Switch indication Connector Name Connector Name R1,N1,R2, DSW1 Test run Power supply and reverse phase detection S2,T2 DSW2 Auxiliary function setting PCN5 Crankcase heater of compressor (oil) DSW3 Capacity code PCN7 Solenoid valve DSW4/ Refrigerant cycle number...
  • Page 157 5 Control System 5.2.6  RAS-12HN(P/C) PCB1 PCB3 TAB4 TAB3 Connector indication Connector indication CN102 Transmission between PCB1 and PCB3 R1,N1,R2, Power supply and reverse phase detection S2,T2 CN404 Line connection between PCB1 and PCB3 CN406 Motor for fan 1 PCN5 Crankcase heater of compressor (oil) EF1,2,3 PCN7 Solenoid valve...
  • Page 158 5 Control System 5.3 Protection and safety control    Compressor protection The following devices and their combinations protect the compressor High-pressure switch This switch cuts out the operation of the compressor when the discharge pressure exceeds the setting. This band heater protects against the oil carry-over during the cold starting, as the band heater is energi- Oil heater zed while the compressor is stopped.
  • Page 159 5 Control System 5.4 Standard operation sequence 5.4.1  Cooling operation (for RAS-(2-2.5)HVNP Tem- and RAS-3HVNC ≤ 60ºC) Power to ≤ 75ºC perature on Power to PCB in Power to CH: ON outdoor unit: the top of comp. OU: ON (for RAS-(2-2.5)HVNP ≥ 75ºC and RAS-3HVNC ≥...
  • Page 160 5 Control System from 1 Start the AUTO-LOUVER only for air panel Pressing Alternatively or indoor unit with AUTO-LOUVER switch auto-louver Stop the AUTO-LOUVER Stop of inverter Stop of MC < Td target temperature -15ºC (for RAS-(2-2.5)HVNP and Tem- RAS-3HVNC < 60ºC) perature on Power to CH: ON the top of comp.
  • Page 161 5 Control System 5.4.2  Dry operation Tem- Power to ≤ 55ºC perature on Power to CH: ON outdoor unit: the top of comp. ≥ 60ºC Power to CH: OFF Only for indoor unit with Auto-louver 0 reset auto-louver Power to Start of transmission between IU indoor unit: Power PCB in IU: ON and OU.
  • Page 162 5 Control System from 1 Start the AUTO-LOUVER only for air panel Pressing Alternatively or indoor unit with AUTO-LOUVER switch auto-louver Stop the AUTO-LOUVER Stop of inverter Stop of MC < Td target temperature -15ºC (for RAS-(2-2.5)HVNP and Tem- RAS-3HVNC < 60ºC) perature on Power to CH: ON the top of comp.
  • Page 163 5 Control System 5.4.3  Heating operation (for RAS-(2-2.5)HVNP Tem- and RAS-3HVNC < 60ºC) Power to < 75ºC perature on Power to PCB in Power to CH: ON outdoor unit: the top of comp. OU: ON (for RAS-(2-2.5)HVNP ≥ 75ºC and RAS-3HVNC ≥ 60ºC) Power to CH: OFF Only for indoor unit with Auto-louver 0 reset...
  • Page 164 5 Control System from 1 Lower than +2ºC in set Heating operation temp. Control of MC frequency intake temp. (including stop) Higher than +2ºC in set temp. Control of MOF fan speed Thermo-OFF (including stop) Higher than set temp. MIF operation at low fan speed intake temp.
  • Page 165 5 Control System 5.4.4  Automatic cooling and heating operation Auto cool/heat operation Lower than set temperature intake temp. Higher than set temperature Cooling Heating operation operation Higher than +2ºC in set temperature intake temp. intake temp. Lower than -2ºC in set temperature Higher than set Lower than set temperature temperature...
  • Page 166 5 Control System 5.4.5  Defrost operation control Power to RVR: OFF Heating For unit with operation Power to Power to EHW: ON YH2: ON DEFROST indication frosting start condition Power to MIF: OFF Power to MOF: OFF RAS-(2-2.5)HVNP / RAS-3HVNC * DSW-1 ON (and DSW2-2 ON for RAS-2.5HVNP) Defrosting Power to Power to...
  • Page 167 5 Control System    Condition for Starting Defrost 1 Standard defrost a. Temperature condition RAS-(2-2.5)HVNP1 RAS-3HVNP1E Model RAS-3HVNC1 RAS-(4-12)H(V)N(P/C)(1)(E) Outdoor evaporating temperature (ºC) Defrosting Defrosting (pipe) operation Outdoor evaporating operation stop area temperature (ºC) stop area (pipe) Temperature condition under defosting -4.6 Outdoor operation...
  • Page 168 5 Control System    Condition for completing defrost operation The defrosting operation is stopped when any of following conditions are met. 1 The outdoor evaporating temperature becomes more than 25ºC (*1) for 2 minutes from starting the defrosting operation. 2 The outdoor evaporating temperature becomes more than 15ºC (*2) (the outdoor temperature < 10ºC) after passing 2 minutes from starting the defrosting operation.
  • Page 169 5 Control System 5.5 Standard control functions 5.5.1  Freezing protection during cooling process or dry operation Power supply Cooling or dry operation compres- sor operated for more than 30min. : The check interval differs depending on the conditions Cooling or dry operation or liquid Higher than 0ºC pipe surface tempera- ture on heat ex- changer Lower than 0ºC...
  • Page 170 5 Control System 5.5.2  Prevention control for high pressure increase during cooling operation This function is performed to prevent the abnormal condition (Alarm Code: 02) when the air flow volume is decreased by a seasonal wind against air outlet of the outdoor unit. When the following conditions are met, the forced Thermo-OFF operation will be performed.
  • Page 171 5 Control System 5.5.3  Prevention control for excessively high discharge gas temperature Heating operation < 60ºC < 65ºC air outlet air outlet temperature temperature ≥ 60ºC ≥ 65ºC CMC: OFF Power ti YH2: OFF Compressor: Power to EHW: (for unit with EHW) CMC: progress ≥ 65ºC ≥ 35ºC air outlet air outlet temperature...
  • Page 172 5 Control System 5.5.4  Activation for protection device control Operation FS: contact is Excesivelly high YH2: contact is MD operation: ON opened drain water level closed RUN indicator Activation of flashes protection device for IU PCB MIF operation: OFF Excesivelly high temperature of IU ITI: opened fan motor Light and LCD are...
  • Page 173 5 Control System 5.5.5  Preheating control of compressor RAS-(2-2.5)HVNP1 / RAS-3HVNC1 During stopping and operating compressor Power to OU: ON Temp ≥ 60ºC at top of com- pressor < 60ºC Power to CH: ON Temp < 60ºC at top of com- pressor ≥ 60ºC Power to CH: OFF ≥...
  • Page 174 5 Control System 5.5.6  Prevention control for high pressure increase This function is performed to prevent the abnormal condition (Alarm: 02) when the outdoor air flow is decreased by a sea- sonal wind against air outlet. When the CMC is ON during cooling operation, PSC is ON and Tc is higher than Tc1+4ºC, forced thermo-off operation will be performed.
  • Page 175 6 Optional functions O p t i o n a l f u n c t i o n s Index 6.1. Optional external input and output signals (By 7-segment display) ............ 162 6.1.1. Available ports ............................162 6.1.2. Available optional external signals ......................164 6.1.3.
  • Page 176 6 Optional functions 6.1 Optional external input and output signals (By 7-segment display) The system has several input and output signals, which can be selected using the following connectors of the outdoor unit’s PCB: Input connectors CN1 and CN2, which have two and one ports respectively to configure three optional input signals. Output connector CN1, which has two ports to configure two optional output signals.
  • Page 177 6 Optional functions  Specification of the components for a correct installation Component Manufacturer or specifications Remarks OMRON mini power relay model: Auxiliary relay (X1) Voltage between relay terminals 12 Vdc - 75 mA MY1F or equivalent OMRON mini power relay model: Auxiliary relay (X3) Voltage between relay terminals 12 Vdc LY2F or equivalent (SS1) (x1), (x2) contact example Manual type...
  • Page 178 6 Optional functions 6.1.2  Available optional external signals The outdoor units have the following signals that are described in the following table. These signals are set up through the PCB of the outdoor unit.  Input signals (CN1 and CN2)  RAS-(2-2.5)HVNP1 / RAS-3HVNC1 Ind. Input signal Application No setting application No setting This signal allows to pre-fix the operation mode, in this case the heating mode, independently of what the indoor unit requests.
  • Page 179 6 Optional functions Ind. Input signal Application This signal allows to regulate current consumption and establish an Current control demand average consumption of 60% of the rate point. This is very useful for installations that run 24 hours a day. This signal allows to regulate current consumption and establish an Current control demand average consumption of 70% of the rate point.
  • Page 180 6 Optional functions  Output signals (CN7) Ind. Output signal Application No setting application No setting This signal allows to pick up the machine’s operation signal. This is Operation signal very useful to start up additional systems such as humidifiers, fans and other additional air-conditioning systems. This signal picks up the machine’s alarm.
  • Page 181 6 Optional functions 6.1.3  Setting of the optional signals The optional signals of the outdoor unit are set up from the PCB of the outdoor unit and can be selected by pushing Input setting 1 Factory setting 1 CN1, 1-2 switches PSW1, PSW2 and PSW3. PSW1 SET* PSW2...
  • Page 182 6 Optional functions 6.1.4  Description of optional signals  Input signals N O T E In brackets control function numbers. a. Fixing operation mode (heating / cooling)(1/2) This input function is fixed in terminals CN1 or CN2 of the PCB of the outdoor unit, to use it as a cooling and heating mode. CN1 must be set up as follows.
  • Page 183 6 Optional functions N O T E • This is an auxiliary function to protect the unit from snow. In snowy regions, make sure to protect the unit with a snow- prevention roof, fence or snow-prevention hood (Field-Supplied), etc.. Otherwise, abnormal vibrations due to imbalan- ced propeller fan will be caused. • If the fan motor or fan controller fail during the intermittent operation of outdoor fan motor, stop all the outdoor fan motor to suspend the operation. Check the alarm code and deal properly with the failure next time the compressor is operated. • When setting the snow sensor switch for Intermittent Operation of Outdoor Fan Motor, make sure that the continuous operating time is 30 seconds or more. Also the intermittent operation of outdoor fan motor intervals shall be at least 10 minutes. Otherwise, malfunction of the outdoor fan motors will be caused by frequent start/stop. D A N G E R • Because of this setting, the outdoor fan can operate even while the outdoor unit (compressor) stops. • Display a notice to that effect on a readily visible part of the unit body, in order to avoid injuries caused by an unintended outdoor fan operation. d. Forced stoppage (4/5) (4)-RAS-(2.0-2.5)HVP1 / RAS-3HVNC1 (5)-RAS-3AVHNP1E / RAS-(4-12)H(V)N(P/C)(1)(E) This is an input function that turns on when the switch receives a signal that causes the compressor and the fan motor of the indoor unit to stop;...
  • Page 184 6 Optional functions  Output signals a. Operation signal (01) This optional signal is used to pick up the operation signal. It can be used to turn on or off complementary units of the air conditioning system,such as fans, humidifiers, etc. Connect the cabling and use the materials as shown in”6.1.1 Available ports”. Note that the contact of auxiliary relay X3 is closed when an operation signal is issued.
  • Page 185 6 Optional functions 6.2 Optional functions (By 7-segment display) The outdoor unit has several optional functions which can be selected through the 7-segment display of the outdoor unit PCB. 6.2.1  Setting of the optional functions The optional functions of the outdoor unit are set up from the PCB of the outdoor unit and can be selected by pushing switches PSW1, PSW2 and PSW3.
  • Page 186 6 Optional functions IVX Premium (RAS-(2.0-12)H(V)NP(1)(E)   ↓ ↑   ↓ ↑ SEG2 SEG1 SEG2 SEG1 Indoor exp. valve open- Not Available Control of the indoor ing change for stoppage Not Available unit fan during Thermo- indoor unit in heating OFF in heating mode mode 1 or 2 (for 3 to 12HP)
  • Page 187 6 Optional functions IVX Standard  (RAS-3HVNC1 / RAS-(8.0-12)HNC(E))   ↓ ↑   ↓ ↑ SEG2 SEG1 SEG2 SEG1 Not prepared Not Available Control of the indoor Not Available unit fan during Thermo- OFF in heating mode Available Available Indoor exp. valve open- Not Available ing change for Thermo- Night mode (Low noise)
  • Page 188 6 Optional functions IVX Standard (RAS-(4-6)H(V)NC1E   ↓ ↑   ↓ ↑ SEG2 SEG1 SEG2 SEG1 Indoor exp. valve open- Not Available Control of the indoor ing change for stoppage Not Available unit fan during Thermo- indoor unit in heating OFF in heating mode mode 1 or 2 (for 3 to 12HP)
  • Page 189 6 Optional functions 6.2.2  Description of the optional functions Control of the indoor unit fan during Thermo-OFF in heating mode (FA) Press PSW1 and select the setting condition “1” at the circulator function at heating thermo-OFF “FA”. In case that the fan speed is changed to “LOW” at heating Thermo-OFF, there is a case that the room air temperature is too high at heating Thermo-OFF.
  • Page 190 6 Optional functions Cancellation of Outdoor Ambient Temperature Limit (GS) Press “PSW1” and select the setting condition “0” to “3” at the cancellation of outdoor ambient temperature limit of “GS”. Then, this function can be set. The heating operation is continued under a high outdoor temperature or the cooling operation is continued under a low temperature.
  • Page 191 6 Optional functions Change of defrost condition (Jo) Press “PSW1” and select the setting condition “1” at the change of defrost condition “Jo”. Example for RAS-(3-12)H(V)N(P/C)(1)(E): Standard Specifications (factory default state) Heating specification Setting condition Function selection setting Jo:0 Function selection setting Jo:1 Defrosting Defrosting Outdoor operation Outdoor evaporat- operation evaporating stop area ing temperature (ºC) stop area temperature (ºC) (pipe)
  • Page 192 6 Optional functions Slo (Fan Speed) defrost setting (bJ) Press “PSW1” and select the setting condition “1” at the slow defrost setting “bJ“. Indoor fan operation is stopped during the defrost operation. Setting condition Indoor fan operation Indoor fan stop during defrost operation Indoor fan SLo during defrost operation Cancellation of outdoor hot start limit (H) Press “PSW1”...
  • Page 193 6 Optional functions Fixing on demand function (dE) Press “PSW1” and select the setting condition “1”, so that the fixing of demand function “dE” can be set. However, it is not necessary to short-circuit the demand input terminals on the outdoor unit PCB. (Refer to section “6.1.4 Description of optional signals” in the input “e. Current control demand (5/6/7/8/9/10)”) The tables below is the limit of the running current for this function.
  • Page 194 6 Optional functions Wave function setting (UE) Press “PSW1” and select the setting condition “1”, so that the wave function setting “UE”. While this function is activated, the maximum limit of running current is changed from (*)60% to 100% as shown in the figure.
  • Page 195 6 Optional functions Intermittent Operation of Outdoor Fan Motor (F1)(RAS-(4-6)H(V)NC1E only) Press “PSW1” and select the setting condition “0” to “4” in Intermittent Operation of Outdoor Fan Motor “F1” or set the control function No. of the external input setting to “4”, so the function can be set. This function is utilized for protection from snow (optional function).
  • Page 196 7-segment display of the outdoor unit’s PCB, there are available a large quantity of optional functions for each remote control switch connected to the system. An example of the available optional functions by the HITACHI remote control switches (PC-ART / PC-ARF) is shown below:...
  • Page 197 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting – Not available Not available – Use at 00 conditions – – Not available Not available – Use at 00 conditions – – Not available Not available – Use at 00 conditions –...
  • Page 198 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting – Not available Not available Use at 00 conditions – – Not available Not available Use at 00 conditions – – Not available Not available Use at 00 conditions – Standard (7 steps) Draft prevention Change of louver...
  • Page 199 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting Not activated This function is used to increase the air function supply pressure in the room. Activated function KPI: Increasing air supply volume Not activated This function selects the enthalpy sensor function input.
  • Page 200 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting Not activated function This function is used to set the automatic timer to switch off when the unit has 04-24 (04-24) h PC-ARF: Automatic been started by remote control. OFF timer setting 30 min Do not set the functions "0C"-"0F"...
  • Page 201 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting 17 ºC 18-20 (18-20) ºC 21 ºC Automatic reset This function is used to set automatic (factory setting) temperature for temperature release in HEAT mode. heating 25-28 (25-28) ºC 29 ºC 30 ºC PC-ART: Not –...
  • Page 202 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting Not activated function PC-ART: Lock This function is used to lock timer activa- function for timer tion. Activated function (factory setting) PC-ART: Not Not available – – – available Use at 00 condition Display PC-ART: Maintenance This function is used to display or hide...
  • Page 203 6 Optional functions Individual Element Optional function Settings Setting conditions Description setting Not available (Use Not available – – PC-ARF only as 00 conditions) Not available (Use Not available – – PC-ARF only as 00 conditions) Not available (Use Not available – –...
  • Page 205 7 Test run Te s t r u n Index 7.1. Checking procedure before the test run ....................192 7.2. Test run procedure using the remote control switch (PC-ART) ............194 7.3. Test run procedure using the remote control switch (PC-ARF) ............196 7.4.
  • Page 206 7 Test run 7.1 Checking procedure before the test run When you have finished the installation, perform the test run according to the following procedure. After performing the test run, hand over the system to the customer. Perform the test run of the indoor units one by one in order. Make sure that the electrical wiring and the refrigerant piping are correctly connected.
  • Page 207 7 Test run • Check to ensure the operating temperature: Cooling operation: Š Indoor DB 21.5ºC and above, Š Indoor WB 16ºC and above, Š Outdoor DB 0ºC and above Heating operation: Š Indoor DB 27ºC and below. (*) About insulation resistance • The insulation may lower during a test run or after being left with the main power OFF for a long time, due to refrigerant accumulation in the compressor.
  • Page 208 7 Test run 7.2 Test run procedure using the remote control switch (PC-ART) Turn ON the power source of the units  Procedure for TEST RUN mode of remote control switch. Operation lamp Counting number of Depress the MODE and the OK switches together for more connected than 3 seconds. units If TEST RUN and the counting number of the connected units to the remote control switch (for example...
  • Page 209 7 Test run Remote control switch Inspection points after power Unit condition Wrong portions indication source OFF Connecting order of each ter- minal boards. Screw fastening of each termi- nal boards. The power source of N O T E outdoor unit in not turned The operation lamp flickers.
  • Page 210 7 Test run 7.3 Test run procedure using the remote control switch (PC-ARF) Display Part Schedule Timer Indicator It is indicated when the schedule timer Fan Speed Indicator Swing Louver Room Name function is set. Indicator Indicator Operation Lock Indicator Operation Mode It is indicated when the operation lock Indicator function is set. The indications of “HEAT” and “AUTO” are indicated FLTR Filter Sign Indicator only for the heat pump type...
  • Page 211 7 Test run Test run screen Test Run Menu Test Run Function Selection a. The test run menu will be displayed. Thermistor Selection Input/Output Function 5 SEL. ENT. RTN. Test Run Setting: 2 units COOL MODE SPEED b. Select “Test Run” and press “OK”. The test run settings will be displayed. LOUV.
  • Page 212 7 Test run 8 For SET-FREE Series: According to the label “Checking of Outdoor Unit by 7-Segment Display on PCB1” attached to the rear side of the front cover of the outdoor unit, check temperature, pressure and the operation frequency, and connected indoor unit numbers by 7-segment displays.
  • Page 213 7 Test run 7.4 Test run procedure using the wireless remote control switch (PC-LH3A/B) N O T E If the wired remote control switch is used or if multiple units (SET-FREE, DC INVERTER and utopia series) are operating simultaneously, you cannot perform the test run by means of the remote control switch. If that is the case, perform the test run by means of the wired remote control switch. 1 Perform the test run after completing the installation. a. Set the batteries for the remote control switch. b. Turn ON the power source of the indoor units and the outdoor units.
  • Page 214 7 Test run c. Alarm code display If some malfunction occurs because of the activation of a safety device or any other reason, the red RUN LED blinks (0.5 seconds ON / 0.5 seconds OFF). Refer to section “8.2.2 Alarm codes for the outdoor and indoor units” on chapter “8. Troubleshooting”. The alarm code displays the number of blinks of the green DEF LED and the yellow FILTER LED as shown bellow: Green DEF LED: Digit 2 of the alarm code blinks.
  • Page 215 7 Test run 7.5 Test run procedure from the outdoor unit side The test run procedure from the outdoor unit side is shown below. You can set this DIP switch while the power source is ON. Setting of dip switch DSW1 1 Test Run 2 COOL/HEAT (Setting ON: Heat Operation) 3 COOL / HEAT intermediate season 4 Manual Compressor stop D A N G E R...
  • Page 216 7 Test run Operation Dip Switch Setting Operation Remarks • Do not repeat defrost operation fre-  Manual defrost operation starts  Defrost operation is available regar- quently. dless of frosting condition and total time Press PSW1 for more than 3 se- of heating operation.
  • Page 217 7 Test run 7.6 Check list 7.6.1  Check list on test run MODEL: SERIAL NUMBER: COMPRESSOR MFG NUMBER: NAME AND ADDRESS OF CUSTOMER: DATE: 1 Is the rotation direction of the indoor coil fan correct? __________ 2 Is the rotation direction of the outdoor coil fan correct? __________ 3 Is there any abnormal compressor sound? __________ 4 Has the unit been operating for at least twenty (20) minutes? __________ 5 Check the room temperature:...
  • Page 218 7 Test run 7.6.2  Check list on compressor CLIENT: MODEL: DATE: Serial number: Production date: Checker: N° Check item Check method Result Remarks (1) Is wire of thermistor correctly connected by viewing? Is THM9 correctly connected? (2) Check to ensure the 7-segment indica- THM9: Discharge gas thermistor tion of Td when compressor is operating.
  • Page 219 7 Test run Additional information for “Check list on compressor” Check item Additional information (mechanism of compressor failure) The liquid refrigerant return volume to the compressor is controlled by the discharge gas temperature Td when compressor is operating. If Td thermistor is disconnected, the liquid refrigerant return volume will become small 1 & 2 by detecting the temperature even if the actual discharge gas temperature is high.
  • Page 221 8 Troubleshooting T r o u b l e s h o o t i n g Index 8.1. Initial troubleshooting .......................... 208 8.1.1. Checking by means of the 7-segment display ..................208 8.1.2. Failure of the power supply to the indoor unit and the remote control switch .......... 209 8.1.3.
  • Page 222 8 Troubleshooting 8.1  Initial troubleshooting 8.1.1  Checking by means of the 7-segment display Simple checking procedure by means of the 7-segment display 1  Turn on all the indoor units which are connected to the outdoor unit. 2  Turn on the outdoor unit 3  Auto-addressing starts. (Outdoor unit printed circuit board PCB1). During the auto-addressing, you can check the following items by means of the 7-segment display of the outdoor unit. •...
  • Page 223 8 Troubleshooting 8.1.2  Failure of the power supply to the indoor unit and the remote control switch • The LED and the LCD are not indicated. • Not operated If the fuses are blown out or a breaker is activated, investigate the cause of the overcurrent and take the necessary action. Action   Phenomenon Cause Check item (Turn OFF the main switch)
  • Page 224 8 Troubleshooting 8.1.3  Abnormal transmission between the remote control switch and the indoor unit RUN LED on the remote control switch: • Flickering every 2 seconds. Action  Phenomenon Cause Check item  (Turn OFF the main switch) Disconnection or insufficient contacting of the remote control Check the cable and the Repair the cable or connect the cable connections cable Check the remote control Replace the remote control Failure of the remote control switch switch by means of the...
  • Page 225 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Failure of thermistor Failure of air inlet Disconnection of Replace or correctly connect thermistor thermistor Check it by self-checking *2) the wires if abnormal operation exists Abnormal operation of the remote control switch cord Check PCB by means of the Failure of the indoor unit PCB Replace PCB if it failed...
  • Page 226 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Indoor cool load is greater than the cooling Calculate the cool load Use a bigger unit capacity Gas leakage or Correctly charge the shortage of Measure superheat refrigerant after repairing the refrigerant gas leakage Excessively small Measure and check the diameter tube or long...
  • Page 227 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Clogging of the outdoor unit Remove the clogging heat exchanger? Obstacles at the inlet or the Insufficient air flow to outlet of the outdoor unit Remove the obstacles the outdoor unit heat heat exchanger exchanger Is the service area for the Secure the service area...
  • Page 228 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Indoor heat load is greater than the heating Replace the unit with a Calculate the heat load capacity bigger unit Gas leakage or Correctly charge the insufficient refrigerant Measure superheat refrigerant after the gas leak- charge age check and repairing Excessively small...
  • Page 229 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Foreign particles inside of the fan casing Visually inspect it Remove the foreign particles Adjust the position of the fan Indoor unit fan runner is hitting the casing Visually inspect it runner Adjust the position of the Outdoor unit propeller fan is hitting the shroud Visually inspect it propeller fan...
  • Page 230 The screen also displays the indoor unit number -A-, the alarm code -B- and the model code -C-. If there are various indoor units connected, the above mentioned information is shown for each one of them -D-. Write down the indications and contact your HITACHI service supplier. • Power supply failure All displays disappear.
  • Page 231 8 Troubleshooting 8.2.2  Alarm codes for the outdoor and indoor units • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. • The unit number and the alarm code are displayed on the 7 segments of the outdoor unit PCB and Remote control Screen (if installed).
  • Page 232 8 Troubleshooting Code  Category Type of abnormality Main cause number Incorrect capacity setting or combined capacity Incorrect Capacity Code Setting, Excessive or Insuf- between outdoor and indoor units ficient Indoor Unit Total Capacity Code Abnormality of anoher Indoor Unit in the same Refrig- Incorrect setting signal from another Indoor Unit erant Cycle (Failure of Power Source, Abnormality of in same system (RPK only)
  • Page 233 8 Troubleshooting 8.2.3  Troubleshooting by alarm code for the outdoor and indoor units Alarm code Activation of the safety device (flow switch) in the indoor unit (except RPK series) This alarm code is displayed when the contact between #1 and #2 of CN14 is not closed over 120 seconds during the cooling process, the heating process or the fan operation.
  • Page 234 8 Troubleshooting Alarm code Activation of the safety device (flow switch) in the indoor unit (RPK only) Indication of Outdoor Unit PCB Alarm code Indoor Unit No. for Malfunction Turn OFF the power Is alarm code “01” indi- Is DSW2-1P on O.U. source and then turn cated on LCD or 7-seg- PCB ON?
  • Page 235 8 Troubleshooting Action  Phenomenon Cause Check item  (Turn OFF the main switch) Check the heat exchanger Remove the dust or the clog- for dust or for clogging ging Check the air filter for dust Remove the dust Check for any obstacles at Insufficient Air Flow to the Heat Exchanger (Outdoor Heat Ex- the inlet or the outlet of the Remove the obstacles changer during the Cooling Process or Indoor Heat Exchanger...
  • Page 236 8 Troubleshooting Activation of the safety device in the outdoor unit Alarm code (Except RAS-(2/2.5)HVNP1 and RAS-3HVNC1) This alarm is indicated when one of safety devices is activated during compressor running. Is the con- nector for PCN8 Plug connector correctly correctly connected? Is there the...
  • Page 237 8 Troubleshooting Action  Phenomenon Cause Check item  (Turn OFF the main  switch) Check the heat exchanger Remove the dust or the for dust or for clogging clogging Check the air filter for dust Remove the dust Check for any obstacles at Insufficient Air Flow to the Heat Exchanger (Outdoor Heat the inlet or the outlet of the Remove the obstacles Exchanger during the Cooling Process or Indoor Heat...
  • Page 238 8 Troubleshooting Abnormal transmission between the indoor units and the outdoor unit for Alarm code RAS-(2-2.5)HVNP1 / RAS-3HVNC1 This alarm is displayed when an abnormal operation is maintained for three minutes after the normal transmission between the indoor units and the outdoor unit. Also, an abnormal operation is maintained for 30 seconds after the micro-computer is automatically reset.
  • Page 239 8 Troubleshooting Is DSW5-1P (terminating Set it correctly resistance) OU on PCB1 Is 230 V Is LED1 (red) on Check power source between L1, N on OU PCB1 ON? for outdoor unit TB1? Does the fuse on OU PCB1 blow out? Replace fuse Remove connector “CN8”...
  • Page 240 8 Troubleshooting Action   Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage by means Power failure or power is not ON Supply the power of the tester Check the insulation material Remove the short-circuit and Short-circuit between the wires for breaks replace the fuse Measure the insulation Remove short-circuit to ground Short-circuited wire to ground...
  • Page 241 8 Troubleshooting Abnormal transmission between the indoor units and the outdoor unit for Alarm code RAS-(3-12)H(V)N(P/C)(1)(E) This alarm is displayed when an abnormal operation is maintained for three minutes after the normal transmission between the indoor units and the outdoor unit. Also, an abnormal operation is maintained for 30 seconds after the micro-computer is automatically reset.
  • Page 242 8 Troubleshooting O.U.: Outdoor unit I.U.:Indoor unit Is DSW5-1P (Terminating Set it correctly Resistance) on O.U PCB1 Is there 230V between L1/ Is LED4 (red) on O.U. Check power source L2(N) (For 1~ models) or PCB1 ON? for outdoor unit between L1/L2/L3/N (For 3N~ models)? Does the fuse EF1 (and...
  • Page 243 8 Troubleshooting Action  Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage Power failure or no power supply Supply power using the tester Remove cause of short circuit. Check for breakage of Short circuit between wires Replace fuse and/or IU/OU insulation PCB if faulty Remove cause of short circuit Measure the insulation to ground.
  • Page 244 8 Troubleshooting   N O T E • *1) In the case that the end terminal resistance (DSW5-1) is set to OFF for H-LINK connection, set the end terminal resistance to ON when CN8 is disconnected. Set the end terminal resistance to OFF when CN8 is reconnected. •...
  • Page 245 8 Troubleshooting Alarm code Abnormal transmission between Inverter PCB and Outdoor PCB1 This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission between the outdoor unit PCB1 and inverter PCB2. Also, the abnormal operation is maintained for 30 seconds after the micro-computer is automatically reset.
  • Page 246 8 Troubleshooting RAS-(3-6)H(V)NP1E In case fuse melted, Is fuse (EF1 or EF2) replace fuse. of outdoor unit normal? Check the cause of melting Remove the connector CN6 on PCB1. Power source ON No (LED2 ON or OFF) Is LED2 (green) on OU PCB1 flashing? Faulty OU PCB1 Reconnect the connector CN6 on...
  • Page 247 8 Troubleshooting RAS-(8-12)HN(P/C)(E) In case fuse melted, Is fuse (EF1 or EF2) replace fuse. of outdoor unit normal? Check the cause of melting Remove the connector CN6 on PCB1. Power source ON No (LED2 ON or OFF) Is LED2 (green) on OU PCB1 flashing? Faulty OU PCB1 Reconnect the connector CN6 on...
  • Page 248 8 Troubleshooting Alarm code Code abnormal operation of picking up phase signal This alarm is displayed when the main power source phase is reversely connected or one phase is not connected. Single phase and 3 phases Correctly connect each (Is there any phase which is phase of the power source PCB1 is normal not connected)?
  • Page 249 8 Troubleshooting Alarm code Excessively low voltage or excessively high voltage for the inverter • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. •...
  • Page 250 8 Troubleshooting RAS-(3-6)H(V)NP1E / RAS-(8-12)HN(P/C)(E) Restart the operation Is the power Check wiring and supply voltage cable capacity 400V±10%? Is the power supply voltage 323V during operation? Does the voltage fall during operation by operation of Fault magnetic other apparatus? contactor. Replace it. Frequency can in- crease higher than 60 Hz...
  • Page 251 8 Troubleshooting Alarm code Decrease of Discharge Gas Superheat • This alarm code is indicated as follows: When the temperature at the top of the compressor is lower than condensing temperature and indoor expansion valve opening is lower than 300 pulse for 30 minutes in cooling operation, retry operation will be performed once. When outdoor expansion valve opening is lower than 70 pulse for 30 minutes in heating operation, retry operation will be performed once.
  • Page 252 8 Troubleshooting Action   Phenomenon Cause Check item (Turn OFF the main switch) Refrigerant cycle is different from the electrical Check refrigerant cycle Repair wiring system and the electrical system Overcharged refrigerant Measure pressure Correctly charge refrigerant Check expansion valve Replace expansion valve if Faulty expansion valve faulty Replace PCB and check Fault...
  • Page 253 8 Troubleshooting Alarm code Excessively High Discharge Gas Temperature at the Top of Compressor The alarm appears during cooling operation when the compressor-top thermistor temperature remains at Tdc1 or above for 10 minutes, or at Tdc2 or above for 5 seconds. The alarm appears during heating operation when the compressor-top thermistor temperature remains at Tdh1 or above for 10 minutes, or at Tdh2 or above for 5 seconds.
  • Page 254 8 Troubleshooting Alarm code Abnormal operation of thermistor for the indoor unit air inlet temperature (air inlet thermistor) This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ) during the cooling process or the heating process. The system is automatically restarted when the fault is removed. Is THM1 (inlet) connected to Connect it I.U.
  • Page 255 8 Troubleshooting Alarm code Abnormal operation of the thermistor for the indoor discharge air temperature (air outlet thermistor) This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ) during the cooling process or the heating process. The system is automatically restarted when the fault is removed. Is THM2 (outlet air) connected Connect it I.U.
  • Page 256 8 Troubleshooting Abnormal operation of the thermistor for the indoor unit heat exchanger liquid pipe temperature Alarm code (freeze protection thermistor) This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ) during the cooling process or the heating process.
  • Page 257 8 Troubleshooting Abnormal operation of the thermistor for the indoor unit heat exchanger gas pipe temperature (gas Alarm code piping thermistor) This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ) during the cooling process or the heating process.
  • Page 258 8 Troubleshooting Activation of the protection device for the indoor fan motor (except RCI-FSN3, RCIM-FSN3, RPC- Alarm code FSN3 and RPK-FSN(H)3M) This alarm code is displayed when the temperature of the internal thermostat for the indoor fan motor is higher than 135 ºC.
  • Page 259 8 Troubleshooting Alarm code Activation of the protection device for the indoor fan motor (RCI-FSN3, RCIM-FSN3, RPC-FSN3) This alarm code is displayed when the following conditions occurs three times in 30 minutes. Indoor fan rotates less than 70 rpm for 5 seconds during operation. •...
  • Page 260 8 Troubleshooting Alarm code Activation of the protection device for the indoor fan motor (RPK) This alarm code is displayed when the following conditions occurs three times in 30 minutes. Indoor fan rotates less than 70 rpm for 5 seconds during operation. •...
  • Page 261 8 Troubleshooting Alarm code Abnormality of thermistor for discharge gas temperature (compressor thermistor) • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 262 8 Troubleshooting Alarm code Abnormality of High pressure sensor for RAS-(3-12)H(V)NP(1)(E) • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 263 8 Troubleshooting Alarm code Abnormal operation of the thermistor for the outdoor temperature (outdoor unit ambient thermistor) • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 264 8 Troubleshooting Abnormal operation of the thermistor for the evaporating temperature during the heating process Alarm code (outdoor unit) • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 265 8 Troubleshooting Alarm code Incorrect Capacity Setting or Combined Capacity between Indoor Units and Outdoor Unit • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 266 8 Troubleshooting Alarm code Incorrect Indoor number setting The alarm code appears from 3 to 5 minutes after the outdoor unit power activation if duplication is detected in indoor unit numbers connected to an outdoor unit (one refrigerant system). This applies when indoor unit numbers are set by DSW6 and RSW1.
  • Page 267 8 Troubleshooting Alarm code Abnormality of Protective Circuit for Protection (Outdoor Unit) RAS-(2-2.5)HVNP1 / RAS-3HVNC1 The alarm code appears if approx. DC12V is supplied to the DIP-IPM connector when the inverter operation is commanded (after five seconds following activation of the remote control switch). Place the tester as shown in the diagram below to check the connector of PCN401.
  • Page 268 8 Troubleshooting Alarm code Cooling Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP1 and RAS-3HVNC1 Abnormality indication will appear when the protection device is activated during compressor operation at cooling (see Note), with the outdoor unit evaporation temperature higher than 55ºC and the compressor-top temperature higher than 95ºC.
  • Page 269 8 Troubleshooting Action  Phenomenon Cause Check item  (Turn OFF main switch) Clogging of Heat Exchanger? Remover clogging Check for dust on air filter Remove dust Insufficient air flow to heat ex- changer of outdoor unit Check the service space Secure service space Check for outdoor fan speed Replace fan motor if faulty Check for hot air near the Make good circulation...
  • Page 270 8 Troubleshooting Alarm code Heating Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP1 and RAS-3HVNC1 Abnormality indication will appear when the protection device is activated during compressor operation at heating (see Note), with the outdoor unit evaporation temperature higher than 55 ºC and the compressor-top temperature higher than 95 ºC.
  • Page 271 8 Troubleshooting Action  Phenomenon Cause Check item  (Turn OFF Main Switch) Clogging of Heat Exchanger Check for dust on air filter Activation of High Pressure Remove it Switch due to Excessively High Insufficient Air Flow to Heat Check for any obstacle at inlet Discharge Pressure during Exchanger of Indoor Unit or outlet of heat exchanger Heating Operation...
  • Page 272 8 Troubleshooting Alarm code Activation of high pressure increase protection device When the compressor is operated with the discharge pressure (Pd) higher than 3.8MPa for 1 minute, the retry operation is performed 3 minutes after all compressors are stopped. Thereafter, this alarm code is indicated when above abnormality is detected twice in 30 minutes.
  • Page 273 8 Troubleshooting Activation to Protect System from Excessively Low Suction Pressure Alarm code (Protection from Vacuum Operation) In the case that the evaporating temperature (Cooling: Liquid Refrigerant Piping Temperature of Indoor Unit, Heating: Evaporating Temperature of Outdoor Unit) is lower than -37 ºC (250~350 kΩ) and the thermistor on top of compres- sor is higher than 90 ºC for 10 minutes, retry operation is performed 3 minutes after compressor stoppage.
  • Page 274 8 Troubleshooting Alarm code Overcurrent protection activation for RAS-(2-2.5)HVNP1 and RAS-3HVNC1 Turn OFF power and check LED1 is OFF. Disconnect relay Is there any cause of connectors from compressor. Check the Restart operation. instantaneous voltage Turn ON number 1 of DSW301 on compressor Does it trip soon? It trips...
  • Page 275 8 Troubleshooting Alarm code Overcurrent protection activation for RAS-(3-12)H(V)N(P/C)(1)(E) Turn OFF power and disconnect U, V, W from compressor terminals. Is there any cause of Check the Restart operation. Turn ON number 1 of DSW1 on instantaneous voltage compressor Does it trip soon? It trips PCB2 (IPM or DIP IPM) and decrease?
  • Page 276 8 Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(2-2.5)HVNP1 / RAS-3HVNC1) This alarm code is displayed when the current transformer is abnormal (0 A detection or 3 A alarm condition) and the alarm has more than three occurrences in 30 minutes. Condition of Activation: Š...
  • Page 277 8 Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(3-6)H(V)N(P/C)1E) This alarm code is displayed when the current transformer is abnormal (0 A detection or 5 A alarm condition) and the alarm has more than three occurrences in 30 minutes. Condition of Activation: Š...
  • Page 278 8 Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(8-12)HN(P/C)(E)) This alarm code is displayed when the current transformer is abnormal (0 A detection or 5 A alarm condition) and the alarm has more than three occurrences in 30 minutes. Condition of Activation: Š...
  • Page 279 8 Troubleshooting Alarm code Activation of transistor module (RAS-(2-2.5)HVNP1 / RAS-3HVNC1) ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times. Conditions: •...
  • Page 280 8 Troubleshooting Alarm code Activation of transistor module (Except for (RAS-(2-2.5)HVNP1 / RAS-3HVNC1)) IPM or Dip IPM and PCB2 have detecting function of abnormality. This alarm is indicated when the transistor mod- ule detect the abnormality 7 times in 30 minutes including 7. Retry operation is performed up to the occurrence of 6 times.
  • Page 281 8 Troubleshooting Compressor stops immediately. Turn OFF power, (Itc=1, 12)* disconnect U, V, W from compressor Check the Normal Failure of inverter PCB. terminals and restart. Restart operation. compressor Replace it. Does the protecting function activate? *3) Abnormal Compressor stops Check the compressor.
  • Page 282 8 Troubleshooting Alarm code Activation of transistor module (RAS-(8-12)HN(P/C)(E)) IPM or Dip IPM and PCB2 have detecting function of abnormality. This alarm is indicated when the transistor mod- ule detect the abnormality 7 times in 30 minutes including 7. Retry operation is performed up to the occurrence of 6 times.
  • Page 283 8 Troubleshooting Compressor stops immediately. (Itc=1, 12)* Are the power wires Pass the power wires passed through CT Restart operation. through CT (inverter element)? Compressor stops after few minutes. (Itc=21)* Turn OFF power, disconnect U, V, W from compressor Check the Normal Failure of inverter PCB.
  • Page 284 8 Troubleshooting Alarm code Abnormality of inverter fin temperature (RAS-3HVNP1E / RAS-(4-6)H(V)N(P/C)1E) This alarm code is indicated after the operation is stpped when the following condition occurs three times within 30 minutes. The retry operation is performed twice. Conditions: • When the temperature of the thermistor for inverter fin excess 80 °C (RAS-3HVNP1E) •...
  • Page 285 8 Troubleshooting Alarm code Abnormality of inverter fin temperature (RAS-(8-12)HN(P/C)(E)) This alarm code is indicated after the operation is stpped when the following condition occurs three times within 30 minutes. The retry operation is performed twice. Conditions: • When the temperature of the thermistor for inverter fin excess 100 °C. Restart the Is thermistor short operation.
  • Page 286 8 Troubleshooting Alarm code Abnormality of Inverter Module Actual frequency from Inverter PCB is less than 10 Hz (after inverter frequency output form PCB1 to Inverter PCB). This alarm is displayed when it occurs 3 times in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
  • Page 287 8 Troubleshooting Abnormality of fan motor protection (DC fan motor) Alarm code For RAS-(2-2.5)HVNP1 and RAS-3HVNC1 This alarm is indicated when the revolution pulse output from the fan motor is lower than 20min during 30 seconds and it stops. Regarding stops, when less than 35 seconds have passed since fan start up, after the first abnormality is detected, if its occurs 4 times more within 5 minutes, it stops and alarm is displayed.
  • Page 288 8 Troubleshooting Alarm code Compressor protection • This alarm code is displayed when one of the following alarms occurs three times within six hours. If the outdoor unit operates continuously without removing the cause of the alarm, the compressor may be seriously damaged Alarm code ...
  • Page 289 8 Troubleshooting 8.2.4  Alarm codes for the KPI (E/H/X)3E Series and DX Interface Code  KPI- KPI- Category Type of Abnormality Main cause number KIT2 Active Float switch activation (high water level in drain Indoor Activation of protection device hose or abnormality in drain pipe, float switch or drain pan). Outdoor fuse meltdown, Indoor/outdoor Transmission Transmission Error connection wiring (breaking, wiring error, etc.) Loose, disconnected, broken or short-circuited...
  • Page 290 8 Troubleshooting 8.3  Troubleshooting in check mode 8.3.1  Troubleshooting using the remote controller PC-ART Use the “OK” switch of the remote control in the following cases: 1  When the RUN LED is flickering. 2  To trace back the cause of the malfunction after restarting from the stop- page while the RUN LED is flickering. 3 ...
  • Page 291 8 Troubleshooting Check mode 1: Current data will be displayed Check mode Check mode 2: The data which was held immediately before the failure will be displayed Press “OK” The indication will delay as the transmission between the remote control switch and the for more than indoor unit takes about ten seconds.
  • Page 292 8 Troubleshooting Although the wireless controller is used for the wall type indoor unit with the built-in receiver part, you can check the alarm code by connecting the PC-P2HTE. Suction grille Connector for check   N O T E • The unit does not operate by pressing the operation switch.
  • Page 293 8 Troubleshooting Indication of micro-computer input/output Heating Thermo-ON Micro-computer input/output in C1  Alarm indoor unit Cooling Thermo-ON Dark Micro-computer input/output in C2 - outdoor unit Y52C2 Y211 Y212 Y52C1 Dark Y20B Y20A Outdoor fan Indication of unit stoppage cause d1 01 14 Cause of stoppage 00 Operation OFF, Power OFF 01 Thermo-OFF (NOTE 1) 02 Alarm (NOTE 2) 03 Freeze protection overheating protection...
  • Page 294 8 Troubleshooting Abnormal operation occurrence counter Abnormal operation occurrence E1 01 Countable up to 99. counter Over 99 times, “99” is always displayed. Instantaneous power failure oc- E2 00 currence counter in indoor unit   N O T E Transmission error occurrence • If a transmission error continues for three minutes, E3 00 counter between remote control...
  • Page 295 8 Troubleshooting Expansion opening indication Indoor unit expansion valve L1 20 opening (%) Outdoor unit expansion valve L2 gg MV1 opening (%) Outdoor unit expansion valve In case of models without the expansion valve (MV2), the L3 gg MV2 opening (%) same figure is displayed L4 00 31 Control information Estimated electric current indication...
  • Page 296 8 Troubleshooting  Contents of the check mode 2 When more than three indoor units are connected to one remote control switch, the latest data of only the first three indoor units that are connected serially are displayed. If you press the part “” of the TEMP switch, the next display appears. If you press the part “” of the TEMP switch, the previous display appears.
  • Page 297 8 Troubleshooting  Self-checking procedure of PCB by means of the Remote Control Switch Use the following troubleshooting procedure for testing the PCB in the indoor unit and the outdoor unit: Press Stop operation Press both switches for three seconds PCB check mode Indi- Contents cation Normal (ex.) Indication of unit No. “0” Abnormality (open-circuit, short-circuit, etc.) in circuit for: Air inlet temperature thermistor Discharge air temperature thermistor...
  • Page 298 8 Troubleshooting If you are using a wireless remote control switch with the built-in receiver part of the wall-type indoor unit and you need to perform the above checking, perform the following procedure: 1  Turn OFF the power supply. 2  Disconnect the connector (CN25) on PWB(M). 3 ...
  • Page 299 8 Troubleshooting  Self-checking procedure of the remote control switch Cases where the OK switch is used: 1  If the remote control switch displays a malfunction. 2  For the regular maintenance check. Indicating  Turn ON the power source LCD indication period  (sec.) Simultaneously press the following three switches. (During the operation, you can press the switches.) Only for the cancellation of...
  • Page 300 8 Troubleshooting The LCD changes as shown below. The detected temperature of the remote control thermostat is displayed at the (A) part in the figure below. If the indicators “ ” or “  ” are displayed at the “A” part, the remote control thermostat is abnormal.
  • Page 301 8 Troubleshooting 8.3.2  Troubleshooting using the remote controller PC-ARF Each “Check Menu” item and its function are explained in the following table. Check Menu Item Function Check 1 Sensor condition of air conditioner will be monitored and indicated. Check 2 Sensor data of air conditioner prior to alarm occurrence will be indicated. Alarm History Display Previous alarm record (date, time, alarm code) will be indicated.
  • Page 302 8 Troubleshooting Check mode 1 items Item Data Name Item Data Name Set Temperature Times of Abnormal Transmitting Inlet Air Temperature Times of Inverter Tripping Discharge Air Temperature Louver Sensor State Liquid Pipe Temperature Discharge Pressure Remote Thermistor Temperature Suction Pressure Outdoor Air Temperature Control Information Gas Pipe Temperature Operating Frequency Evaporating Temperature at Heating...
  • Page 303 8 Troubleshooting  Checking procedure of PCB by means of the Remote Control Switch Check Menu (1) Press and hold “ ” (menu) and “?” (help) simultaneously for 3 seconds during the normal mode. I. U./O. U. PCB Check The check menu is displayed. Self Checking (2) Select “I.U./O.U. PCB Check” from the check menu and press “OK”.
  • Page 304 8 Troubleshooting  Self-checking procedure of PCB by means of the Remote Control Switch The self checking performs to check the remote control switch and to clear EEPROM (storage cell inside of the remote control switch). (1) Press and hold “ ” (menu) and “?” (help) simultaneously for 3 Check Menu seconds during the normal mode (when unit is not operated).
  • Page 305 8 Troubleshooting (9) No Function Self Checking This function is not used. Press “OK” to proceed. 0 7 : 0 0 0 (10) Transmission Circuit Test The remote control switch automatically starts to check the transmission circuit. Self Checking (11) Remote Control Switch Thermistor Test 0 9 : 0 2 5 The temperature detected by remote control switch thermistor is displayed at “...
  • Page 306 8 Troubleshooting 8.3.3  Troubleshooting using the 7 segment display  Simple checking by 7-segment display During auto-addressing, the following items can be checked using the Turn ON indoor unit connected to outdoor unit’s on-board 7-segment LED display: the outdoor unit 1  Disconnection of power supply to the indoor unit. Turn ON the outdoor unit 2 ...
  • Page 307 8 Troubleshooting RAS-(2-2.5)HVNP1 / RAS-3HVNP1 Item Indication data Item Check  Indic. Indic. Contents number Input/output state of outdoor micro- Indicates only for the segments corresponding to the equipment in  computer the figure. (See figure above) 00~96 Capacity of operating indoor unit oP 11 In case that capacity is higher than 100, the last two digits flash 0~115 ( Hz) Inverter order frequency to compressor...
  • Page 308 8 Troubleshooting RAS-(3-12)H(V)NP(1)(E) Item Indication data Item Check  Indic. Indic. Contents number Input/output state of outdoor micro- Indicates only for the segments corresponding to the equipment in  computer the figure. (See figure above) 00~199 Capacity of operating indoor unit oP 11 In case that capacity is higher than 100, the last two digits flash Control Software No.
  • Page 309 8 Troubleshooting RAS-(4-12)H(V)NC(1)(E) Item Indication data Item Check  Indic. Indic. Contents number Input/output state of outdoor micro- Indicates only for the segments corresponding to the equipment in  computer the figure. (See figure above) 00~199 Capacity of operating indoor unit oP 11 In case that capacity is higher than 100, the last two digits flash Control Software No.
  • Page 310 8 Troubleshooting  Cause of indoor unit stoppage ( Indication Contents Operation OFF, Power OFF Thermo-OFF Alarm Freeze protection overheating protection Instantaneous power failure at outdoor unit Instantaneous power failure at indoor unit Stoppage of Cooling Operation due to Low Outdoor Air Temperature Stoppage of Heating Operation due to High Outdoor Air  ...
  • Page 311 8 Troubleshooting Cancellation of Forced Thermo OFF ( Turn ON the power source and wait for more than 30 seconds. Then press PSW1 for more than 3 seconds. Forced thermo-OFF (indoor unit error code 21) will be cancelled. However, this function may damage the compressor, use only on inevitable occasion. •...
  • Page 312 8 Troubleshooting  Protection control code on 7-segment display 1  Protection control code is displayed on 7-segment when a protection control is activated. 2  Protection control code is displayed while function is working, and goes out when released. 3  When several protection control are activated, code number with higher priority will be indicated (see below for the priority order).
  • Page 313 8 Troubleshooting  Activating condition of protection control code To monitor the conditions such as the temperature change and others, the control of the frequency and other controls are performed by the protection control in order to prevent the abnormal operations. The activating conditions of protection control are shown in the table below: RAS-(2-2.5)HVNP1 / RAS-3HVNC1 Code...
  • Page 314 8 Troubleshooting RAS-(3-12)H(V)N(P/C)(1)(E) Code Protection control Activating condition Remarks Compression ratio ε ≥ 7.5 => frequency decrease Pressure ratio control ε = (Pd+0.1)/(Ps+0.1) Compression ratio ε ≤ 1.6 => frequency increase High Pressure Switch for Control is activated High-pressure increase protection => Frequency Decrease If Inverter PCB secondary current >...
  • Page 315 8 Troubleshooting 8.4  Checking procedure for main parts 8.4.1  Checking procedure for the PCB (PCB1 ref PO101)   N O T E *1) The following table shows the check points and the normal range of voltage in the case that the voltage on the outdoor unit PCB is measured with a circuit tester. The setting of the circuit tester shall be set within the DC voltage measurement range when the following voltages are measured.
  • Page 316 8 Troubleshooting Check Point Normal Range (V) (+) Side of Tester (-) Side of Tester Approx. 311VDC VDC-2 VCC15-1 13.5VDC ~ 16.5VDC VCC05 4.5VDC ~ 5.5VDC GND1 VCC12 11.9VDC ~14.3VDC   C A U T I O N • Do not apply the test lead to unspecified check points when measuring the voltage with a circuit tester. Otherwise, it may cause a failure of the outdoor unit PCB and the circuit tester.
  • Page 317 8 Troubleshooting 8.4.2  Checking procedure for the DIP-IPM inverter  RAS-(3-6)H(V)N(P/C)1E High voltage discharge work for replacing parts   C A U T I O N Electrical hazard. Risk of electrical shock. Perform this high voltage discharge work to avoid an electric shock. 1  Turn OFF the main switches and wait for three min- DIP-IPM utes.
  • Page 318 8 Troubleshooting 1  Touch [+] side of the tester to DIP-IPM 52C terminal, and [-] side to DIP-IPM R, S and T terminals to meas- ure the resistance. Normal if all three terminals have 1 kΩ or greater. 2  Contrary to [1], touch [-] side of the tester to DIP-IPM 52C terminal, and [+] side to DIP-IPM R, S terminals to measure the resistance.
  • Page 319 8 Troubleshooting 9  Check items [1] – [8]. 10  Touch [+] side of the tester to DIP-IPM DCL2 terminal, and [-] side to [P] of ISPM/DIP-IPM (soldered part) to measure the resistance. Normal if all three terminals have 100 kΩ or greater 11 ...
  • Page 320 8 Troubleshooting Checking Method of Fuse for fan motor protection (EF1) (Measure the resistance under 1 kΩ range of a circuit tester.)   N O T E DO NOT use a digital tester. By placing the side of tester to EF1 on inverter PCB, measure the resistance. If the resistance is 0Ω, it is normal. Contact with specified terminals Place wires to to measure.
  • Page 321 8 Troubleshooting Transistor module checking procedure Outer Appearance and Internal Circuit of Transistor Module 1. Drive circuit. 2. Overheating protection circuit. 3. Sensor. Procedure: Remove all the terminals of the transistor module before check. If items [1] – [4] are performed and the results are satisfac- tory, the transistor module is normal.
  • Page 322 8 Troubleshooting Diode module checking procedure Outer appearance and internal circuit of diode module: If items [1] – [4] are performed and the results are satisfactory, the diode module is normal. Measure it under 1kΩ range of a tester.   N O T E DO NOT use a digital tester.
  • Page 323 8 Troubleshooting 8.4.3  Checking procedure for the capacitors CB1 & CB2   D A N G E R • Electrical hazard. Risk of serious injuries or death. • Before installing the electrical wiring or before performing a periodical check, turn OFF the main switch of the unit. For safety reasons, be sure that the fan is stopped. • Prevent from touching the capacitors’ terminals. High voltage should be present before discharging them. • Turn off the unit and wait for the LED 201 to be off before touching the components. If it’s possible, check the capacitance of each capacitor : 4700μF ± 20% (between 3760μF to 5640μF). A visual check of the pressure valve of capacitors must be done to ensure it’s integrity  ...
  • Page 324 8 Troubleshooting 8.4.4  Checking procedeure for the DC fan motor When ISPM/DIP-IPM is faulty and Alarm 03, 04 or 53 appears, the fan motor may also be damaged. To prevent ISPM/DIP- IPM damage which may result from operation combined with a faulty fan motor, check also if the fan motor is not damaged when ISPM/DIP-IPM is replaced  ...
  • Page 325 8 Troubleshooting 8.4.5  Checking procedure for the AC fan motor Fan motor rated  Resistance (Ω)   Part name Unit models Wiring diagram Lead wire colour capacity (at 20ºC) Blue Main coil 2 Auxiliary coil Fan motor Black Black-White 21.6+-10% KFC6S-201SB5P RAS-12HN(P/C) Black-Blue 32.1+-10% (1 piece 200W Main Black-Red 24.4+-10% (lower)) coil 1 White Thermo Orange 8.4.6  Checking procedure for the electronic expansion valve for indoor and outdoor units Indoor unit electronic expansion valve Outdoor unit electronic expansion valve Check the liquid pipe temperature during the heating...
  • Page 326 8 Troubleshooting 8.4.7  Checking procedure for other parts Resistance (Ω) Part name Model code Resistance (Ω) Unit models 1250 RAS-(3-12)H(V)NP(1)(E) Solenoid Valve Coil SR10D (at 20ºC) RAS-(4-12)H(V)NC(1)(E) 1473 RAS-(3-12)H(V)NP(1)(E) VHV-01AP552B1 (at 20ºC) RAS-(8-12)HNC(E) Reversing Valve Coil RAS-(2-2.5)HVNP1 STF-G01AG579A1 (at 75ºC) RAS-3HVNC (4-way solenoid valve) 1800 STF-H01AI1870A1 RAS-(4-6)H(V)NC1E (at 20ºC) 1.138 EU1114D9 RAS-2HVNP1...

  • Page 327: Troubleshooting

    8 Troubleshooting  Checking procedure for the reversing valve Troubleshooting Is the connector PCN(6/100) *1) Connect it correctly. on PCB1 connected correctly? Reversing valve is faulty (disconnec- Is the resistance of the reversing tion, etc.). Replace it with a new one.   N O T E valve coil *2) correct? *1) PCB1 connnector PCN100 (PCN6 RAS-(2-2.5)HVNP1,...
  • Page 328 8 Troubleshooting 4-way solenoid 4-way solenoid valve coil valve coil Time Chart Cooling operation Defrost operation Heating operation Heating operation 4-way solenoid valve Current is continuously carried while the reversing valve is ON. is turned ON Coil voltage Bistable solenoid operation type (pulse-activated) Operation Mode: Cooling → Heating Operation Mode: Cooling →...
  • Page 329 8 Troubleshooting Switch relay: ON Switch relay: OFF (Cooling/Heating) (Cooling/Heating) Reversing valve relay: ON Reversing valve relay: ON 4-way solenoid 4-way solenoid valve coil valve coil Separation Separation resistance resistance Time Chart Cooling operation Defrost operation Heating operation Heating operation 4-way solenoid valve Current is carried only when turning the reversion...
  • Page 330 8 Troubleshooting  Checking procedure for the compressor CHECK LIST ON COMPRESSOR Client: Model: Date: Serie number: Production date: Checker: Check item Check method Result Remarks Is THM9 correctly connected? 1. Is wire of thermistor correctly connected by view- ing? THM9: Discharge Gas Thermistor 2. Check to ensure the 7-segment indication of Td when comp.
  • Page 331 8 Troubleshooting Additional Information for “CHECK LIST ON COMPRESSOR” Check item Additional information (mechanism of the compressor failure) 1 & 2 The liquid refrigerant return volume to the compressor is controlled by the discharge gas temperature Td when com- pressor is operating. If Td thermistor is disconnected, the liquid refrigerant return volume will become small by detect- ing the temperature even if the actual discharge gas temperature is high.
  • Page 333 9 Spare parts S p a r e p a r t s Index 9.1. RAS-(2-2.5)HVNP1 ..........................320 9.1.1. Cycle and structural parts ........................320 9.1.2. Parts table ............................... 321 9.2. RAS-3HVNC1............................322 9.2.1. Cycle and structural parts ........................322 9.2.2.
  • Page 334 9 Spare parts 9.1 RAS-(2-2.5)HVNP1 9.1.1  Cycle and structural parts LOCATION OF SPARE PARTS IN THE UNIT MODEL RAS-2HVNP1 RAS-2.5HVNP1 U98A U34B U15C U15A U32B U98E U21B U21A U01A U100 U01B U15B U98B U32A U98D U34A U27B U27A U98C U101 Spare Parts Document: EPN-201212B SMGB0087 rev.0 - 12/2013...
  • Page 335 9 Spare parts 9.1.2  Parts table    Cycle and structural parts Number Part name Remarks U01A Pressure SW High pressure U01B Pressure SW For control Fuse U15A Thermistor U15B Thermistor U15C Thermistor U21A Expansion valve U21B Coil for expansion valve U27A Stop valve Gas line U27B Stop valve...
  • Page 336 9 Spare parts 9.2 RAS-3HVNC1 9.2.1  Cycle and structural parts LOCATION OF SPARE PARTS IN THE UNIT MODEL RAS-3HVNC1 U98A U34B U15C U15A U32B U98E U21B U21A U01A U100 U01B U15B U98B U32A U98D U34A U27B U27A U98C U101 Spare Parts Document: EPN-201212A SMGB0087 rev.0 - 12/2013...
  • Page 337 9 Spare parts 9.2.2  Parts table    Cycle and structural parts Number Part name Remarks U01A Pressure SW High pressure U01B Pressure SW For control Fuse U15A Thermistor U15B Thermistor U15C Thermistor U21A Expansion valve U21B Coil for expansion valve U27A Stop valve Gas line U27B Stop valve...
  • Page 338 9 Spare parts 9.3 RAS-3HVNP1E 9.3.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT CABINET AND CYCLE Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 339 9 Spare parts 9.3.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(3/4/5/6)HVNP1E View from A Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 340 9 Spare parts 9.3.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks Rear Cover Assy Assembly Stay End P Unit Handle Partition S Assy H Cover Accumulator Pipe Cover B Strainer Upper Cover Assy Assembly Pressure SW for Low Pressure Service Cover S Assy Assembly Coil 20...
  • Page 341 9 Spare parts 9.4 RAS-(4-6)H(V)NP1E 9.4.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT CABINET AND CYCLE Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 342 9 Spare parts 9.4.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(3/4/5/6)HVNP1E View from A Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 343 9 Spare parts LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(4/5/6)HNP1E View from A Spare Parts Document: EPN-201211A SMGB0087 rev.0 - 12/2013...
  • Page 344 9 Spare parts 9.4.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks Strainer Rear Cover L Assy Assembly Pressure SW for Low Pressure Handle Coil 20 Coil for Solenoid Valve H Cover Coil Coil for 4-Way Valve Pipe Cover B 4-Way Valve Assy Assembly Upper Cover Assy...
  • Page 345 9 Spare parts    Electrical parts RAS-(4-6)HVNP1E RAS-(4-6)HNP1E Part name Remarks Part name Remarks Electrical Wiring Diagram Assembly (2+3+Harness) Electrical Wiring Diagram Assembly (2+3+Harness) P Plate Unit Assembly (2-1~2-11) P Plate Unit Assembly (2-1~2-11) P Plate Assy Assembly P Plate Assy Assembly Printed Circuit Board PCB1, PO101A Assy...
  • Page 346 9 Spare parts 9.5 RAS-(4-6)H(V)NC1E 9.5.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT CABINET AND CYCLE RAS-4H(V)NC1E Spare Parts Document: EPN-201211A SMGB0087 rev.0 - 12/2013...
  • Page 347 9 Spare parts LOCATION OF SPARE PART IN THE UNIT CABINET AND CYCLE RAS-(5/6)H(V)NC1E 34 41 37 41 31-2 31-1 30-3 23-2 30-2 30-4 30-6 23-4 30-1 23-3 30-5 30-8 30-7 B-5x14 30-10 35 41 23-1 B-6x16 30-9 B-5x14 Spare Parts Document: EPN-201211A SMGB0087 rev.0 - 12/2013...
  • Page 348 SUBJECT SERVICE DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 19/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9 Spare parts 9.5.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT...
  • Page 349 ELECTRICAL PARTS RAS-(4/5/6)HNCE LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(4/5/6)HNC1E  View from A View from A  Spare Parts Document: EPN-201211D Hitachi Air Conditioning Products Europe, S. A. Nº EPN-201211A Barcelona (Spain) SMGB0087 rev.0 - 12/2013...
  • Page 350 9 Spare parts 9.5.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks End P Unit Rear Cover Assy Assembly Partition S Assy Handle Accumulator Assy H Cover Strainer Pipe Cover B Coil 20 Coil for Solenoid Valve Upper Cover Assy Assembly Coil Coil for 4 Way Valve...
  • Page 351 9 Spare parts    Electrical parts RAS-(4-6)HVNC1E RAS-(4-6)HNC1E Part name Remarks Part name Remarks Electrical Wiring Diagram Assembly (2+3+Harness) Electrical Wiring Diagram Assembly (2+3+Harness) P Plate Unit Assembly (2-1~2-11) P Plate Unit Assembly (2-1~2-11) P Plate Assy Assembly P Plate Assy Assembly Printed Circuit Board PCB1, PO101D Assy...
  • Page 352 9 Spare parts 9.6 RAS-(8-10)HN(P/C)E 9.6.1  Cycle and structural parts RAS-(8-10)HNPE Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 353 9 Spare parts RAS-(8-10)HNCE Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 354 9 Spare parts 9.6.2  Electrical parts View from P Spare Parts Document: EPN-201211D SMGB0087 rev.0 - 12/2013...
  • Page 355 9 Spare parts 9.6.3  Parts name    Cycle and structural parts RAS-(8-10)HNPE Part name Remarks Part name Remarks Strainer Rear Cover L Assy Assembly Pressure SW Handle Coil 20 Coil for Solenoid Valve H Cover Coil Coil for 4 Way Valve Pipe Cover B 4-Way Valve Assy Assembly Upper Cover Assy...
  • Page 356 9 Spare parts RAS-(8-10)HNCE Part name Remarks Part name Remarks Strainer Rear Cover L Assy Assembly Pressure SW Handle Coil 20 Coil for Solenoid Valve H Cover Coil Coil for 4 Way Valve Pipe Cover B 4-Way Valve Assy Assembly Upper Cover Assy Assembly 30-1 D Pipe Unit...
  • Page 357 9 Spare parts    Electrical parts Part name Remarks Electrical Box Assembly (2+3+4+Harness) P Plate Assy Assembly Printed Circuit Board PCB1, PO101B Assy Spacer For PCB1, PCB3, Noise Filter Push Spacer For PCB1 Printed Circuit Board PCB3, PO121A Assy Terminal Board Noise Filter Fuse Holder Fuse...
  • Page 358 Flat Head Screw Pan Head Tapping Screw Hexagon Head Bolt Stud Bolt G Nut Washer Spring Lock Washer Toothed Lock Washer Accessory Spare Parts Document: SPN-201302 N O T E • The unicromated coating is applied to iron and steel material for the unspecified materials of the bolt and screw. • The parts without the order numbers are the custom-ordered, and these are not included in the price list provided by us. When ordering them, the part name and the drawing number are required. • Some parts may take longer time to deliver. Contact your HITACHI distributor for details such as delivery date or price etc. SMGB0087 rev.0 - 12/2013...
  • Page 359 Flat Head Screw Pan Head Tapping Screw Hexagon Head Bolt Stud Bolt G Nut Washer Spring Lock Washer Toothed Lock Washer Spare Parts Document: SPN-201302 N O T E • The parts without the order numbers are the custom-ordered, and these are not included in the price list provided by us. When ordering them, the part name and the drawing number are required. • Some parts may take longer time to deliver. Contact your HITACHI distributor for details such as delivery date or price etc. • The unicromated coating is applied to iron and steel material for the unspecified materials of the bolt and screw. SMGB0087 rev.0 - 12/2013...
  • Page 360 Compressor DA65PHD-D1SE2 Screw Vibration Absorber Valve Stay Vibration Absorber Thermo Attaching Plate Screw Crankcase Heater 240V-40W HITACHI Label Soundproof Cover Thermistor for Outdoor Temperature Rubber Cap Thermistor for Pipe Temperature Heat Exchanger Lower Side for Discharge Gas Tempe- Heat Exchanger...
  • Page 361 9 Spare parts    Electrical parts Part name Remarks Metal Plate Printed Circuit Board for Control (PO101-S) Fuse on Control PCB, 250V 5A Fuse on Control PCB, 250V 10A Plastic Material Plastic Material Printed Circuit Board for DC Fan Control (PO121-S) Fuse on DC Fan Control PCB, 250V 5A Fuse...
  • Page 363 10 Servicing 1 0 . S e r v i c i n g Index 10.1. Safety Introduction ..........................353 10.2. RAS-(2-2.5)HVNP1 and RAS-3HVNC1 ....................354 10.2.1. Removing pipe cover ..........................354 10.2.2. Removing front cover ..........................354 10.2.3. Removing outdoor fan ..........................354 10.2.4.
  • Page 364 10 Servicing 10.4.8. Removing the High pressure switch and Pressure switch for control ............378 10.4.9. Opening electrical box (P plate) ......................379 10.4.10. Removing Reversing valve coil ....................... 379 10.4.11. Removing electronic expansion valve coil ....................379 10.4.12. Removing solenoid valve coil (SVA and SVC) ..................380 10.4.13.
  • Page 365 10 Servicing 10.7. RAS-(4-6)H(V)NC1E ........................... 411 10.7.1. Removing service cover ...........................411 10.7.2. Remove outlet grille ..........................411 10.7.3. Removing upper cover ..........................411 10.7.4. Removing bottom service cover and rear cover ..................412 10.7.5. Removing outdoor fan motor ........................412 10.7.6. Removing electrical box .......................... 413 10.7.7.
  • Page 366 10 Servicing 10.9.8. Removing High pressure switch and pressure switch for control ............446 10.9.9. Opening electrical box (P-Mounting Plate) ....................446 10.9.10. Removing reversing and solenoid valves coils ..................447 10.9.11. Removing electronic expansion valve coil ....................447 10.9.12. Removing reversing valve ........................448 10.9.13.
  • Page 367 10 Servicing 10.1  Safety Introduction   D A N G E R DO NOT TOUCH THE ELECTRICAL COMPONENTS WHILE LED 201 (RED) ON THE INVERTER PCB OR LED1 (RED) ON PCB1 OR LED4 ON PCB1 ARE ON, TO AVOID ELECTRICAL SHOCK. WAIT UNTIL ALL LEDS TURN OFF.
  • Page 368 10 Servicing 10.2  RAS-(2-2.5)HVNP1 and RAS-3HVNC1 10.2.1  Removing pipe cover Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing.
  • Page 369 10 Servicing 5  Remove the electrical box cover. 6  Remove the fan motor connector (CN24) inserted into the PCB in the electrical box. Remove the fan motor lead wire fixed onto the motor clamp using a cord band. Remove 4 screws which fixes the motor. Cord band Cap nut Fan motor lead wire...
  • Page 370 10 Servicing 5  Open the soundproof cover wrapped around the compressor and remove the terminal box cover of the compressor body. Disconnect the compressor wires in the terminal box and remove the thermis- tor on top of the compressor. Compressor-Top Thermistor Mount •...
  • Page 371 10 Servicing 10.2.5  Removing high pressure switch and pressure switch for control 1  Remove the pipe cover following Removing pipe cover. 2  Remove 3 fixing screws and remove the upper cover. 3  Remove the front cover following Removing front cover. 4  Collect the refrigerant from the check joint. 5  Disconnect the Faston Terminals. 6 ...
  • Page 372 10 Servicing 10.2.7  Removing electronic expansion valve coil 1  Remove the pipe cover following Removing pipe cover. 2  Remove 3 fixing screws and remove the upper cover. CN5A connector 3  Remove the front cover following Removing front cover. (white) 4  Remove the electrical box cover. 5  Remove 7 fixing screws and remove the side cover. 6 ...
  • Page 373 10 Servicing 10.2.8  Removing electrical components Removing Electrical Box 1  Remove the pipe cover following Removing pipe cover. 2  Remove 3 fixing screws and remove the upper cover. 3  Remove the electrical box cover. 4  Remove 1 fixing screw and remove the terminal cover. 5  Disconnect all the wiring connected to the control PCB. 6 ...
  • Page 374 10 Servicing 10.2.8.2  Removing other electrical components 1  Remove the pipe cover following Removing pipe cover. 2  Remove 3 fixing screws and remove the upper cover. 3  Remove the electrical box cover. 4  Removing Electrical Components. Remove the fixing screw and remove the reactor. • To mount components be sure to match the wiring connection with the mark band codes.
  • Page 375 10 Servicing 10.3  RAS-3HVNP1E 10.3.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. Pull downward and remove the service cover after removing 3 upper and lower fixing screws.
  • Page 376 10 Servicing 10.3.3  Removing upper cover Remove the upper cover upward after removing 9 fixing screws. Upper cover 10.3.4  Removing bottom service cover and rear cover 1  Remove 5 screws which fix the bottom service cover. Pull and re- move the bottom service cover. 2  Remove the upper cover following “10.3.3 Removing upper cover”. 3 ...
  • Page 377 10 Servicing 10.3.5  Removing outdoor fan motor 1  Remove the service cover following “10.3.1 Removing service cover”. 2  Remove the outlet grille following “10.3.2 Remove outlet grille”. 3  Remove the upper cover following “10.3.3 Removing upper cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 378 10 Servicing 10.3.6  Removing electrical box Upper cover Upper Cover Electrical box Electrical Box 1  Remove the service cover following “10.3.1 Remo- Remove 4 screws fixing the ving service cover”. Remove four (4) fixing screws electrical box for electrical box. 2  Remove the upper cover following “10.3.3 Removing upper cover”.
  • Page 379 10 Servicing 10.3.7  Removing the compressor 1  Remove the service cover, upper cover, bottom service cover and rear cover following “10.3.1 Removing service co- ver”, “10.3.3 Removing upper cover”, and “10.3.4 Removing bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall. 2 ...
  • Page 380 10 Servicing   N O T E Be sure to separate the blazing burner flame sufficiently from the wires and electrical components around the brazed part in order to avoid burning. Brazing Part Brazing Part Discharge Pipe Discharge Pipe Suction Pipe Suction Pipe 8  Remove 1 nut which fix the compressor and remove it by lifting up. Compressor Position Vibration-Proof Rubber : with a nut -: without a nut Vibration-proof Vibration-Proof...
  • Page 381 10 Servicing   N O T E • To prevent contamination of the refrigerant by water or foreign materials, do not expose the refrigerant parts open to atmosphere for long periods. If necessary, seal pipe ends using caps or tape. • Remove the cap for compressor right before replacing the compressor. When replacing the compressor, seal the tape at the suction and the discharge pipes to prevent foreign materials. Remove it when brazing pipes. • Securely check terminal numbers and mark bands before disconnecting lead wires. When reassembling the lead wires, connect them to match surely the terminal numbers and the mark bands. If the lead wires are connected incorrectly to the terminal, the compressor will be damaged due to reverse rotation. 10.3.8  Removing the High pressure switch and Pressure switch for control 1  Remove the service cover following “10.3.1 Removing service cover”. 2  Collect the refrigerant from the check joint according to “10.3.7 Removing the compressor” in this chapter. High pressure switch and pressure switch for control 1 ...
  • Page 382 10 Servicing 10.3.9  Opening electrical box (P plate) Upper Cover Upper cover Power plate Power Plate 1  Remove the service cover following “10.3.1 Remo- ving service cover” in this chapter. 2  Unplug all the connectors of the electrical box. Fixing Screw Fixing screw 3  Remove 5 screws which fix the electrical box and open the P plate turning counter clockwise approxi- mately 90°.
  • Page 383 10 Servicing 10.3.12  Removing solenoid valve coil (SVC) Solenoid valve coil Solenoid valve coil screw 1  Remove the service cover and the upper cover following “10.3.1 Removing service cover” “10.3.1 Removing ser- vice cover”. 2  Unplug the connector PCN14 (SVC) on O.U. PCB1. 3  Remove the fixing screw, and remove the solenoid valve coil (SVC) upward.
  • Page 384 10 Servicing 10.3.14  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.3.1 Removing service cover”, and “10.3.4 Removing bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.3.7 Removing the compressor” 3  Remove the coils according to “10.3.11 Removing electronic expansion valve coil”and...
  • Page 385 10 Servicing 10.3.16  Removing other electrical components 1  Remove the service cover following “10.3.1 Removing service cover”in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following “10.3.9 Opening electrical box (P plate)”. • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. Fuse 1 ...
  • Page 386 10 Servicing 10.4  RAS-(4-6)H(V)NP1E 10.4.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. Service 1  Remove the 4 fixing screws, slide the service cover downward and Service Cover cover remove it.
  • Page 387 10 Servicing 10.4.3  Removing upper cover Upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. 10.4.4  Removing the bottom service cover and rear cover Rear cover Air outlet grille 1  Remove 5 screws fixing the lower part of service cover and remove Bottom the lower part of service cover by pulling towards front side.
  • Page 388 10 Servicing 10.4.5  Removing outdoor fan motor 1  Remove the service cover following “10.4.1 Removing service cover”. 2  Remove the outlet grille following “10.4.2 Removing air outlet grille” 3  Remove the upper cover following “10.4.3 Removing upper cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 389 10 Servicing 10.4.6  Removing electrical box Upper cover Upper Cover Electrical box Electrical Box 1  Remove the service cover following “10.4.1 Removing Remove four (4) fixing screws Remove 4 screws service cover” . for electrical box. fixing the electrical 2  Remove the upper cover following “10.4.3 Removing upper cover”.
  • Page 390 10 Servicing 10.4.7  Removing the compressor CN5A PCN9 PCN8 PCN14 PCN13 PCN7 PCN6 PCN10 PCN5 DSW5 SEG1 LED3 LED2 DSW1 RSW1 DSW2 DSW4 REG1 1  Remove the service cover, bottom service cover and rear cover LED4 Rear Cover PCN100 R195 Rear Cover PCN1 following “10.4.1 Removing service cover” and “10.4.4 Removing...
  • Page 391 10 Servicing  Fixation of the compressor to the bottom plate Compressor position Vibration-proof rubber 1 Vibration-proof rubber 2 — — — — Vibration-proof Vibration-Proof Rubber 2 Rubber 2 Vibration-proof Vibration-Proof Rubber 1 Rubber 1 Cool the pipe by Cool the pipe wet cloth by wet cloth. 8  When brazing the replaced compressor quickly perform the brazing whi- le the compressor side piping is cooled with wet cloth in order to avoid the brazing material from entering the compressor.
  • Page 392 10 Servicing 10.4.8  Removing the High pressure switch and Pressure switch for control 1  Remove the service cover and the bottom service cover following “10.4.1 Removing service cover”, and “10.4.4 Remo- ving the bottom service cover and rear cover”. 2  Collect the refrigerant from the check joint according to “10.4.7 Removing the compressor” in this chapter. High pressure switch and pressure switch for control 1  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 2 ...
  • Page 393 10 Servicing 10.4.9  Opening electrical box (P plate) Upper Cover Upper cover Power plate Power Plate 1  Remove the service cover following “10.4.1 Removing service cover” in this chapter. Fixing Screw Fixing 2  Unplug all the connectors of the electrical box. screw 3  Remove 5 screws which fix the electrical box and open the P plate turning counter clockwise approximately 90°.
  • Page 394 10 Servicing 10.4.12  Removing solenoid valve coil (SVA and SVC) Solenoid valve coil screw Fixing Screws for Solenoid Valve Coil 1  Remove the service cover and the upper cover following Solenoid valve coil (SVC) Solenoid Valve Coil (SVC) “10.4.1 Removing service cover” “10.4.3 Removing upper cover”. 2  Unplug the connector PCN7 (SVA) and PCN14 (SVC) on O.U. PCB1.
  • Page 395 10 Servicing 10.4.14  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.4.1 Removing service cover” “10.4.4 Removing the bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.4.7 Removing the compressor”. 3  Remove the coils according to “10.4.10 Removing Reversing valve coil” and “10.4.12 Removing solenoid valve coil (SVA and SVC)”. 4  Remove the brazed parts as shown in the figures. Electronic Expansion Valve (EVO) Brazed Parts: 2 Solenoid Valve (SVA) Brazed Parts: 2 Solenoid Valve (SVC) Brazed Parts: 2...
  • Page 396 10 Servicing 10.4.15  Removing electrical components 10.4.15.1  Removing control PCB (PCB1) 1  Remove the service cover following “10.4.1 Removing ser- Holder vice cover”. Holder 2  Remove all the wiring connected to the control PCB. 3  Remove the 6 holders. Clamp the middle part of the holders with long-nose pliers and remove it toward front side. Printed Circuit Board (PCB1) Printed Circuit Board (PCB1) 10.4.15.2 ...
  • Page 397 10 Servicing 10.4.16  Removing other electrical components 1  Remove the service cover following “10.4.1 Removing service cover” in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following “10.4.9 Opening electrical box (P plate)”. • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. Fuse 1 ...
  • Page 398 10 Servicing 10.5  RAS-(8-10)HNPE 10.5.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. Service 1  Remove the 4 fixing screws, slide the service cover downward and Service Cover cover remove it.
  • Page 399 10 Servicing 10.5.3  Removing upper cover Upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. 10.5.4  Removing the bottom service cover and rear cover Rear Air outlet cover grille 1  Remove 5 screws fixing the lower part of service cover and remove Bottom the lower part of service cover by pulling towards front side.
  • Page 400 10 Servicing 10.5.5  Removing outdoor fan motor 1  Remove the service cover following “10.5.1 Removing service cover”. 2  Remove the outlet grille following “10.5.2 Removing air outlet grille”. 3  Remove the upper cover following “10.5.3 Removing upper cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 401 10 Servicing 10.5.6  Removing electrical box Electrical box Upper cover 1  Remove the service cover following “10.5.1 Removing service cover”. 2  Remove the upper cover following “10.5.3 Removing Remove the upper cover”. Remove 6 screws which fix the electrical fixing screws box. 3  Pull up and remove the electrical box.  ...
  • Page 402 10 Servicing 10.5.7  Removing the compressor 1  Remove the service cover and the bottom service cover following Upper cover “10.5.1 Removing service cover”, and “10.5.4 Removing the bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall.
  • Page 403 10 Servicing Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Indication of terminal number Terminal box cover Compressor Compressor wires Fix it with screw Compressor wires (3 wires) Details for compressor terminals   N O T E • Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around before heating with burner for the oil inside the piping may flame up.
  • Page 404 10 Servicing 7  Remove 2 nuts which fix the compressor and remove it by lifting it up with inclining forward.   N O T E To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE ATTEN- TION not to crush to break the pipe. 8  When brazing the replaced compressor quickly perform the brazing while the compressor side piping is cooled with wet cloth in order to avoid the brazing material from entering the compressor.
  • Page 405 10 Servicing 10.5.8  Removing High pressure switch and pressure switch for control 1  Remove the service cover following “10.5.1 Removing service cover” in this chapter. 2  Collect the refrigerant from the check joint according to “10.5.7 Removing the compressor”, in this chapter. High pressure switch and pressure switch for control 1  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 2 ...
  • Page 406 10 Servicing 10.5.10  Removing reversing valve coil 1  Remove the service cover following “10.5.1 Removing service cover” in this chapter. 2  Remove the connector (PCN100) on the control PCB (PCB1) of the electrical box. 3  Remove the reversing valve coil by removing 1 screw fixing the coil. Upper cover.
  • Page 407 10 Servicing 10.5.12  Removing solenoid valve coil (SVA and SVC) 1  Remove the service cover following “10.5.1 Removing service co- Solenoid valve coil screw Solenoid valve ver”. coil (SVC) 2  Open the P-mounting plate. Check to ensure the LED201 (Red) of the inverter PCB (PCB2) is OFF. 3  Unplug the connector PCN7 (SVA) and PCN14 (SVC) on O.U. PCB1.
  • Page 408 10 Servicing 10.5.14  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.5.1 Removing service cover” “10.5.4 Removing the bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.5.7 Removing the compressor”. 3  Remove the coils according to “10.5.10 Removing reversing valve coil”...
  • Page 409 10 Servicing 10.5.15  Removing electrical components 10.5.15.1  Removing control PCB (PCB1) and relay PCB (PCB3) Printed Circuit Board (PCB1) 1  Remove the service cover following “10.5.1 Removing ser- vice cover”. 2  Remove all the wiring connected to the control PCB and the Holder relay PCB.. 3  Remove the 6 holders for each PCB. Clamp the middle part of the holders with long-nose pliers and remove it toward front side.
  • Page 410 10 Servicing Removing Diode Module (DM) 1  Disconnect the wirings of terminal + - U V W on the diode module. 2  Remove 2 M5 fixing screws on the diode module. 3  Remove the diode module from the electrical box. 5 Screws (M5) Fixing screw (M5) Removing Transistor Module (IPM) 1 ...
  • Page 411 10 Servicing 10.5.16  Removing other electrical components 1  Remove the service cover following “10.5.1 Removing service cover” in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following “10.5.9 Opening electrical box (P-Mounting Plate)”. • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. Fuses Capacitors 1 ...
  • Page 412 10 Servicing 10.6  RAS-12HNP 10.6.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. 1  Remove the 5 fixing screws, slide the service cover downward and Service cover remove it.
  • Page 413 10 Servicing 10.6.3  Removing upper cover Upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. 10.6.4  Removing the bottom service cover and rear cover Rear Air outlet cover grille 1  Remove 5 screws fixing the lower part of service cover and remove Bottom the lower part of service cover by pulling towards front side.
  • Page 414 10 Servicing 10.6.5  Removing outdoor fan motor 1  Remove the service cover following “10.6.1 Removing service cover”. 2  Remove the outlet grille following “10.6.2 Removing air outlet grille”. 3  If necessary, remove the upper cover following “10.6.3 Removing upper cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 415 10 Servicing 10.6.6  Removing electrical box 1  Remove the service cover following “10.6.1 Removing service cover”. Remove the fixing screws 2  Remove the upper cover following “10.6.3 Removing upper cover”. Remove 6 screws which fix the electrical box. 3  Pull up and remove the electrical box.  ...
  • Page 416 10 Servicing 10.6.7  Removing the compressor Upper cover 1  Remove the service cover and the bottom service cover following “10.6.1 Removing service cover”, and “10.6.4 Removing the bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall. Check joint 2 ...
  • Page 417 10 Servicing Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Indication of terminal number Terminal box cover Compressor Compressor wires Fix it with screw Compressor wires (3 wires) Details for compressor terminals   N O T E • Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around before heating with burner for the oil inside the piping may flame up.
  • Page 418 10 Servicing Suction pipe Compressor position Discharge pipe Cover pipes with wet cloth Vibration-proof Rubber 2 Vibration-proof Rubber 1 Fixation of the compressor to the bottom plate Compressor position Vibration-proof rubber 1 Vibration-proof rubber 2 — — — — Detail of Spring for Crankcase Heater 9  Reassemble the parts in the reverse order of removing procedures.
  • Page 419 10 Servicing 10.6.8  Removing High pressure switch and pressure switch for control 1  Remove the service cover following “10.6.1 Removing service cover” in this chapter. 2  Collect the refrigerant from the check joint according to “10.6.7 Removing the compressor”, in this chapter. High pressure switch and pressure switch for control 1  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 2 ...
  • Page 420 10 Servicing 10.6.10  Removing reversing and solenoid valves coils 1  Remove the service cover following “10.6.1 Removing service cover” in this chapter. 2  Remove the connectors on the control PCB (PCB1) of the electrical box according to the following picture. 3  Remove the valve coils by removing 1 fixing screw for each coil. Upper cover Electrical box Rear cover...
  • Page 421 10 Servicing 10.6.12  Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.6.1 Removing service cover” “10.6.4 Removing the bottom service cover and rear cover”. 2  Remove the reversing valve coil according to “10.6.12 Removing reversing valve”. 3  Recover the refrigerant from check joints according to “10.6.7 Removing the compressor”. 4  Remove the reversing valve assemblies from the fixed positions (5 brazing parts and 1 flare connection). a. ...
  • Page 422 10 Servicing 10.6.13  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.6.1 Removing service cover” “10.6.4 Removing the bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.6.7 Removing the compressor”. 3  Remove the coils according to “10.6.11 Removing electronic expansion valve coil” and “10.6.10 Removing reversing and solenoid valves coils”. Removing electronic expansion valve Electronic expansion valve 1 ...
  • Page 423 10 Servicing 10.6.14  Removing electrical components 10.6.14.1  Removing control PCB (PCB1 and PCB3) 1  Remove the service cover following “10.6.1 Removing ser- vice cover”. Holder 2  Remove all the wiring connected to the control PCB. 3  Remove the 6 holders. Clamp the middle part of the hol- ders with long-nose pliers and remove it toward front side. Printed Circuit Board (PCB1 and PCB3) 10.6.14.2 ...
  • Page 424 10 Servicing Removing Transistor Module (IPM) 1  Disconnect all the wirings connected to the transistor module. 2  Remove the connectors CN2, CN3, CN206, PCN301 and PCN302 from the transistor module. 3  Disconnect the wirings of P N U V W on the transistor module. 4 ...
  • Page 425 10 Servicing 10.7  RAS-(4-6)H(V)NC1E 10.7.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. Service Cover 1  Pull downward and remove the service cover after removing 4 upper and lower fixing screws.
  • Page 426 10 Servicing 10.7.4  Removing bottom service cover and rear cover 1  Remove 5 screws which fix the bottom service cover. 2  Pull and remove the bottom service cover. 3  Remove the upper cover following “10.7.3 Removing upper cover”. 4  Remove 8 screws which fix the rear cover. 5  Pull backward and remove the rear cover. Electrical Box Electrical Box Air Outlet Grille...
  • Page 427 10 Servicing Remove 4 screws which fix the motor. Model RAS-(4-6)H(V)NC1E Connector pin location Inverter PCB - CN202 Motor fixing screws 4x M5 screws Motor clamp. Cord clamp. Plastic band. Lead Wire for fan motor. Fan motor   N O T E 1 ...
  • Page 428 10 Servicing U-shapped hole Front Front U-shaped Hole side Side Partition plate Partition Plate Fan Room Fan room Original position Original Position Electrical Box (Radiation Fin) Electrical box (radiation fin) Front Front Front Front side side Side Side Partition plate Partition Plate Set the electrical box (radiation fin) Place the electrical box (radiation fin) in...
  • Page 429 10 Servicing   N O T E Check Perform the recovery work at the check joint of piping. If not, the refrigerant remains inside. 6  Open the soundproof cover wrapped around the compressor and remove the terminal box cover attached to the com- pressor. Then disconnect the wires for the compressor and the thermistor for the discharge gas temperature (THM9) on the top of the compressor.
  • Page 430 10 Servicing Vibration Absorber Front Side Compressor Position Vibration-Proof Rubber : with a nut -: without a nut 10  When brazing the replaced compressor braze quickly cooling the pipes on the compressor side with wet cloth to avoid the filler metal entering into the compressor.  ...
  • Page 431 10 Servicing 10.7.7.2  RAS-(5-6)H(V)NC1E Upper Cover 1  Remove the service cover, upper cover, bottom ser- Rear Cover vice cover and rear cover following “10.7.1 Remo- ving service cover”, “10.7.3 Removing upper cover”, “10.7.4 Removing bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall.
  • Page 432 10 Servicing 8  Remove the suction pipe and discharge pipe from the compressor.   N O T E Be sure to separate the blazing burner flame sufficiently from the wires and electrical components around the brazed part in order to avoid burning. 9  Remove 2 nuts which fix the compressor and remove it by lifting it up with inclining forward.   N O T E To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE AT- TENTION not to crush to break the pipe.
  • Page 433 10 Servicing 11  Perform in the reverse procedure of removing after replacing the compressor. a.  Check if the Faston terminal has any abnormality. (Ensure the pull out force greater than 20 Nm). If the Faston terminal is identified faulty replace with a new one. b. ...
  • Page 434 10 Servicing 10.7.8  Removing the High pressure switch and Pressure switch for control 1  Remove the service cover and the bottom service cover following “10.7.1 Removing service cover”, and “10.7.4 Remo- ving bottom service cover and rear cover”. 2  Collect the refrigerant from the check joint according to “10.7.7 Removing the compressor”, in this chapter. 3  Remove the soundproof cover on the compressor. 4 ...
  • Page 435 10 Servicing 10.7.9  Opening electrical box (P plate) Upper Cover Upper cover Power plate Power Plate 1  Remove the service cover following “10.7.1 Removing service cover” in this chapter. Fixing Screw Fixing screw 2  Unplug all the connectors of the electrical box. 3  Remove 5 screws which fix the electrical box and open the P plate turning counter clockwise approximately 2 Fixing screws 2 Fixing Screws...
  • Page 436 10 Servicing 10.7.11  Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following “10.7.1 Removing service cover”, “10.7.4 Removing bottom service cover and rear cover” and “10.7.3 Removing upper cover”. Pull out the expansion valve coil upward while holding it 2  Disconnect the CN5A connector on the control PCB of the elec- trical box.
  • Page 437 10 Servicing 10.7.13  Removing reversing valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following “10.7.1 Removing service cover”, “10.7.4 Removing bottom service cover and rear cover” and “10.7.3 Removing upper cover”. 2  Remove the reversing valve coil according to “10.7.10 Removing Reversing valve coil”. 3  Remove the solenoid valve coil (SVA) according to the item “Removing Solenoid Valve Coil (SVA).” 4 ...
  • Page 438 10 Servicing 10.7.14  Removing Electronic expansion valve and Solenoid valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following “10.7.1 Removing service cover”, “10.7.4 Removing bottom service cover and rear cover” “10.7.3 Removing upper cover”. 2  Recover the refrigerant from check joints according to Brazing Part Solenoid Valve (SVA) “10.7.7 Removing the compressor”.
  • Page 439 10 Servicing 10.7.15.2  Removing Inverter module Inverter PCB Inverter PCB 1  Remove the service cover following “10.7.1 Removing service cover” in this chapter. 2  Open the P plate turning counter clockwise approxi- mately 90° following “10.7.9 Opening electrical box (P plate)”. 4 fixing Fixing Screw 3  Check that the LED201 (red) on Inverter is OFF when screws (4 pcs.) the P plate is opened.
  • Page 440 10 Servicing 10.8  RAS-(8-10)HNCE 10.8.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. Service Service Cover • Do not expose the refrigerant cycle to the atmosphere for a long cover period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing.
  • Page 441 10 Servicing 10.8.3  Removing upper cover Upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. 10.8.4  Removing the bottom service cover and rear cover Rear outlet cover grille 1  Remove 5 screws fixing the lower part of service cover and remove Bottom the lower part of service cover by pulling towards front side.
  • Page 442 10 Servicing 10.8.5  Removing outdoor fan motor 1  Remove the service cover following “10.8.1 Removing service cover”. 2  Remove the outlet grille following “10.8.2 Removing air outlet grille”. 3  Remove the upper cover following “10.8.1 Removing service cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 443 10 Servicing 10.8.6  Removing electrical box Electrical box Upper cover 1  Remove the service cover following “10.8.1 Removing service cover”. 2  Remove the upper cover following “10.8.3 Removing Remove upper cover”. the fixing 3  Remove 6 screws which fix the electrical box. screws 4  Pull up and remove the electrical box.  ...
  • Page 444 10 Servicing 10.8.7  Removing the compressor Upper cover 1  Remove the service cover and the bottom service cover following “10.8.1 Removing service cover”, and “10.8.4 Removing the bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall. 2 ...
  • Page 445 10 Servicing Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Indication of terminal num- Terminal box cover Compressor Compressor wires Fix it with screw Compressor wires (3 wires) Details for compressor ter- minals   N O T E • Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around before heating with burner for the oil inside the piping may flame up.
  • Page 446 10 Servicing 7  Remove 2 nuts which fix the compressor and remove it by lifting it up with inclining forward.   N O T E To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE AT- TENTION not to crush to break the pipe. 8  When brazing the replaced compressor quickly perform the brazing while the compressor side piping is cooled with wet cloth in order to avoid the brazing material from entering the compressor.
  • Page 447 10 Servicing 10.8.8  Removing High pressure switch and pressure switch for control 1  Remove the service cover following “10.8.1 Removing service cover” in this chapter. 2  Collect the refrigerant from the check joint according to “10.8.7 Removing the compressor”, in this chapter. 3  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 4 ...
  • Page 448 10 Servicing 10.8.10  Removing reversing valve coil 1  Remove the service cover following “10.8.1 Removing ser- vice cover” in this chapter. 2  Remove the connector (PCN6) on the control PCB (PCB1) of the electrical box. 3  Remove the reversing valve coil by removing 1 screw fixing the coil. 4 ...
  • Page 449 10 Servicing 10.8.12  Removing solenoid valve coil (SVA) Ebox 1  Remove the service cover following “10.8.1 Removing service co- ver”. 2  Open the P-mounting plate. Check to ensure the LED201 (Red) of the inverter PCB (PCB2) is OFF. 3  Unplug the connector PCN7 (SVA) on O.U. PCB1. 4 ...
  • Page 450 10 Servicing 10.8.14  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.8.1 Removing service cover” “10.8.4 Removing the bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.8.7 Removing the compressor”. 3  Remove the coils according to ““10.8.11 Removing elec- tronic expansion valve coil” and “10.8.12 Removing so- lenoid valve coil (SVA)”...
  • Page 451 10 Servicing 10.8.15.2  Removing Inverter module Holder 1  Remove the service cover following “10.8.1 Removing service cover”. 2  Open the P plate turning counter clockwise approximately 90° following “10.8.9 Opening electrical box (P-Mounting Plate)”. 3  Check that the LED201 (red) on Inverter is OFF when the P plate is opened. 4 ...
  • Page 452 10 Servicing 10.8.16  Removing other electrical components 1  Remove the service cover following “10.8.1 Removing service cover” in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following “10.8.9 Opening electrical box (P-Mounting Plate)”. • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. Fuses Capacitors 1 ...
  • Page 453 10 Servicing 10.9  RAS-12HNC 10.9.1  Removing service cover   N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long Service cover period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing.
  • Page 454 10 Servicing 10.9.3  Removing upper cover Upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. 10.9.4  Removing the bottom service cover and rear cover Rear cover outlet grille 1  Remove 5 screws fixing the lower part of service cover and remove Bottom the lower part of service cover by pulling towards front side.
  • Page 455 10 Servicing 10.9.5  Removing outdoor fan motor 1  Remove the service cover following “10.9.1 Removing service cover”. 2  Remove the outlet grille following “10.9.2 Removing air outlet grille”. 3  If necessary, remove the upper cover following “10.9.3 Removing upper cover”. 4  To remove the propeller fan remove the cap nut and washer which fix the propeller fan onto the motor shaft. (Use a puller when the propeller fan and motor shaft are fixed too tightly).
  • Page 456 10 Servicing 10.9.6  Removing electrical box 1  Remove the service cover following “10.9.1 Removing Remove the service cover”. fixing screws 2  Remove the upper cover following “10.9.3 Removing upper cover”. 3  Remove 6 screws which fix the electrical box. 4  Pull up and remove the electrical box.  ...
  • Page 457 10 Servicing 10.9.7  Removing the compressor Upper cover 1  Remove the service cover and the bottom service cover following “10.9.1 Removing service cover”, and “10.9.4 Removing the bottom service cover and rear cover”. When the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall. Check joint 2 ...
  • Page 458 10 Servicing Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Indication of terminal num- Terminal box cover Compressor Compressor wires Fix it with screw Compressor wires (3 wires) Details for compressor ter- minals   N O T E • Compressor piping must be connected by brazing. MAKE SURE that any flammable material is not around before heating with burner for the oil inside the piping may flame up.
  • Page 459 10 Servicing 7  Remove 2 nuts which fix the compressor and remove it by lifting it up with inclining forward.   N O T E To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE ATTEN- TION not to crush to break the pipe. 8  When brazing the replaced compressor quickly perform the brazing while the compressor side piping is cooled with wet cloth in order to avoid the brazing material from entering the compressor.
  • Page 460 10 Servicing 10.9.8  Removing High pressure switch and pressure switch for control 1  Remove the service cover following “10.9.1 Removing service cover” in this chapter. 2  Collect the refrigerant from the check joint according to “10.9.7 Removing the compressor”, in this chapter. 3  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 4 ...
  • Page 461 10 Servicing 10.9.10  Removing reversing and solenoid valves coils 1  Remove the service cover following “10.9.1 Remo- Upper cover ving service cover” in this chapter. Electrical box 2  Remove the connectors on the control PCB (PCB1) of the electrical box according to the following pic- ture. 3  Remove the valve coils by removing 1 fixing screw for each coil.
  • Page 462 10 Servicing 10.9.12  Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.9.1 Removing service cover” “10.9.4 Removing the bottom service cover and rear cover”. 2  Remove the reversing valve coil according to “10.9.12 Removing reversing valve”. 3  Recover the refrigerant from check joints according to “10.9.7 Removing the compressor”. 4  Remove the reversing valve assemblies from the fixed positions (4 brazing parts and 1 flare connection). a. ...
  • Page 463 10 Servicing 10.9.13  Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following “10.9.1 Removing service cover” “10.9.4 Removing the bottom service cover and rear cover”. 2  Recover the refrigerant from check joints according to “10.9.7 Removing the compressor”. 3  Remove the coils according to “10.8.11 Removing electronic expansion valve coil” and “10.9.10 Removing reversing and solenoid valves coils”. Removing electronic expansion valve Electronic expansion valve 1 ...
  • Page 464 10 Servicing 10.9.14  Removing electrical components 10.9.14.1  Removing control PCB (PCB1) 1  Remove the service cover following “10.9.1 Removing ser- vice cover”. Holder 2  Remove all the wiring connected to the control PCB. 3  Remove the holders. Clamp the middle part of the holders with long-nose pliers and remove it toward front side. 10.9.14.2 ...
  • Page 465 10 Servicing Removing Transistor Module (IPM) 1  Disconnect all the wirings connected to the transistor module. 2  Remove the connectors CN2, CN3, CN206, PCN301 and PCN302 from the transistor module. 3  Disconnect the wirings of P N U V W on the transistor module. 4 ...
  • Page 466 10 Servicing Capacitors Reactor Diode module 1  Remove all the wiring connected to the capacitors.   N O T E The wires have polar characters. Identify the wire mark band and the indication on the capacitor when connecting wires. Fuse 2  Remove 2 screws fixing the capacitors. Capacitor 1  Remove all the wiring connected to CMC. 2  Remove 3 screws fixing the CMC. Reactor 1 ...
  • Page 467 11 Electrical checks of main parts 11 . E l e c t r i c a l c h e c k s o f m a i n p a r t s Index 11.1. Inverter ..............................454 11.1.1.
  • Page 468 11 Electrical checks of main parts 11.1  Inverter 11.1.1  Specifications of inverter Applicable  RAS-(2-2.5)HVNP1  RAS-(4-6)HNP1E RAS-(4-6)HNC1E RAS-(8-12)HN(P/C)(E) RAS-3HVNP1E RAS-(4-6)HVNP1E RAS-(4-6)HVNC1E model RAS-3HVNC1 1 Phase 220-240V/50Hz, Applicable 3 Phase 400V 50 Hz 1 Phase. 230V 50 Hz power source 1 Phase 220V/60Hz Output current 24.0A 16.0A 25.0A...
  • Page 469 11 Electrical checks of main parts Protection function Applicable  RAS-(2-2.5)HVNP1  RAS-(4-6)HNP1E RAS-(4-6)HNC1E RAS-(8-12)HN(P/C)(E) RAS-3HVNP1E RAS-(4-6)HVNP1E RAS-(4-6)HVNC1E model RAS-3HVNC1 Excessive low voltage at a voltage is lower than Excessive high 350 V DC Excessive low voltage at a voltage is lower than 194 V DC or low voltage Excessive high voltage at a voltage is higher Excessive high voltage at a voltage is higher than 400 V DC...
  • Page 470 11 Electrical checks of main parts 11.1.2  Inverter time chart Frequency Frequency LOW Main Circuit Main circuit Frequency Power Source Frequency All bit 1 Operation All bit 1 operation All bit 1 All bit 1 power source HIGH HIGH Frequency Frequency Instruction instruction Output voltage Output...
  • Page 471 11 Electrical checks of main parts 11.1.3  Protective function 1  Excessive high or low voltage for inverter a.  Level of detection • When the voltage of direct current is greater than (A) • When the voltage of direct current is smaller than (B) Power supply 3N ~ 400V 50Hz ...
  • Page 472 11 Electrical checks of main parts 5  Fin temperature increase a.  Level of detection When the temperature of internal thermistor exceeds more than 80ºC (for 3HP), 90ºC (for 4 to 6HP Premium), 92ºC (for 4 to 6HP Standard) or 100ºC (for 8 to 12HP) an abnormality is detected. b. ...
  • Page 473 11 Electrical checks of main parts 11.2  Thermistor Thermistors for the outdoor unit DCL1 JP12 R116 R115 JP11 CN5A PCN9 PCN8 PCN14 PCN13 PCN7 PCN6 PCN10 PCN5 C112 DSW5 SEG1 DANGER HIGH VOLTAGE LED3 CP20 R111 LED2 DCL2 DSW1 R117 R118 RSW1 DSW2 DSW4 CP26 REG1 LED4...
  • Page 474 11 Electrical checks of main parts Thermistor for discharge gas temperature (THM9) (For prevention of discharge gas overheating) 1  A thermistor for the upper part temperature of the Thermistor resistance characteristics compressor is installed to prevent discharge gas from overheating. If discharge gas temperature increases excessively lubri- cating oil deterioration occurs and lubricating properties deteriorate resulting in short compressor life.
  • Page 475 11 Electrical checks of main parts Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting) (THM8) Thermistor resistance characteristics 78.0 58.3 44.0 33.7 26.0 20.2 15.9 12.6 10.0 8.05 6.52 5.31 4.36 3.60 2.99 2.49 -15 -10 35 40 Temperature (ºC) Thermistor for condensing temperature of RAS-4H(V)RNS3E outdoor unit (THM10) Thermistor resistance characteristics 78.0 58.3 44.0 33.7 26.0 20.2 15.9...
  • Page 476 11 Electrical checks of main parts 11.3  Electronic expansion valve Micro-computer Pulse signal 2-phase permanent magnetic pulse motor Control 0 to 500 pulse by 1 pulse Refrigerant flow control 1. Pulse motor. Precise control 2. Needle. Items Specifications Type UKV series Refrigerant R410A Working temperature range -30 ºC 70 ºC (operation time of the coil: less than 50%)
  • Page 477 11 Electrical checks of main parts 11.4  High pressure protection device If the discharge pressure is excessively high the compressor and the component parts of the refrigeration cycle can be damaged. • High Pressure Switch (PSH): If the discharge pressure is excessively high the compressor and the component parts of the refrigeration cycle can be da- maged.
  • Page 478 11 Electrical checks of main parts RAS-4H(V)NC1E RAS-(5-6)H(V)NC1E RAS-(8-10)HNPE RAS-(8-10)HNCE Pressure sensor for High pressure control switch Pressure High pressure sensor for Brazing part Brazing part switch control Discharge pipe Brazing part Brazing part P view Suction pipe Discharge pipe Brazing part Low pressure switch RAS-12HNP...
  • Page 479 11 Electrical checks of main parts 11.5  Noise filter (NF) 11.5.1  Noise filter for 3N~ (400V/50Hz) The noise filter decreases the leakage of noise made by the inverter to the power supply side. Terminals indicated with “LOAD” are connected to the inverter side and terminals indicated with “LINE” to the power supply side. Items Specifications Model...
  • Page 480 11 Electrical checks of main parts 11.5.2  Noise filter for 1~ (230V/50Hz) The noise filter decreases the leakage of noise made by the inverter to the power supply side. Terminals indicated with “LOAD” are connected to the inverter side and terminals indicated with “LINE” to the power supply side. Items Specifications Model...
  • Page 481 11 Electrical checks of main parts 11.6  Capacitor (CB1 CB2) 8/10/12 HP only This part is used for changing the alternative current to the direct current for the inverter. Connect two capacitor in line and used. Items Specifications Models LNX2W472MSEEHE Capacity of static electricity 4700 μF Rated voltage 450 VDC Permissible temperature range...
  • Page 482 11 Electrical checks of main parts 11.7  Reactor (DCL) 11.7.1  Reactor (DCL) for 3N~ (400V/50Hz) This part is used for changing the alternative current to the direct current for the inverter. Items Specifications Character 1.0 mH+10 (at 1 kHz) Rated current 30 A Direct resistance 22.8 mΩ+20 (at 20 °C) Permissible temperature range -20 ºC to 60 ºC...
  • Page 483 11 Electrical checks of main parts 11.8  Scroll compressor 11.8.1  Reliable mechanism for low vibrating and low sound 1  The rotating direction is definite. 2  The pressure inside of the chamber is high pressure and the surface temperature of the chamber is 60 ºC to 110 ºC. 11.8.2  Principle of compression 1.
  • Page 485 12 Maintenance notes 1 2 . M a i n t e n a n c e n o t e s Index 12.1. General notes ............................472 12.1.1. Checking the power source and the wiring connection ................472 12.1.2. Burnt-out compressor due to an insufficient refrigerant charge ............... 472 12.1.3.
  • Page 486 12 Maintenance notes 12.1  General notes 12.1.1  Checking the power source and the wiring connection Check the following items in the case of abnormal operation: Check item Procedure Is the breaker or the fuse Check the secondary voltage of the breaker and the fuse by means of a tester. cut out? Disconnect the secondary side of the transformer and check the voltage by means of a tester. Indoor unit Indoor unit transformer...
  • Page 487 12 Maintenance notes 12.1.3  Insufficient cooling performance when a long piping is applied Question and answer for the field work Example 2: Insufficient cooling performance when a long piping is applied Phenomenon Sufficient cooling was not available for an indoor unit that was located at the farthest position. If the location of an outdoor unit is 20 meters lower than the location of the indoor units resetting of the DIP switch DSW2 is required.
  • Page 488 12 Maintenance notes 12.1.5  Alarm code “03” Question and answer for the field work Example 4: Alarm code “03” Phenomenon Alarm code “31” sometimes occurred and the system stopped. The combination of the indoor units and the outdoor unit was the following. Power Power Source source Cause This system was used in a tenant building. One of tenant’s customers turned off the main switch for the indoor unit while other indoor units are running.
  • Page 489 12 Maintenance notes 12.2  Maintenance work For the indoor unit and the outdoor unit 1  Fan and fan motor • Lubrication: All the fan motors are pre-lubricated and sealed at the factory. Therefore no lubrication maintenance is required. • Sound and vibration: Check for abnormal sounds and vibrations. •...
  • Page 490 12 Maintenance notes 12.3  Service and maintenance record Check item Action Judgement Is the service area sufficient? — Is there a short circuit of the discharged air? — Any heat influence? — Is the ground wire connected? — Refrigerant piping. — Good Not Good Fixing the units.
  • Page 491 12 Maintenance notes 12.4  Service and maintenance record using the 7-segment display Customer’s name:___________________________________________________________ Date:_______________ RAS-  RAS-   Outdoor unit model (serial No.) (Serial No._______________) (Serial No.________________) 1. Operation mode 2. Test run start time 3. Data collect start time 4. Read out data from 7-segment in outdoor unit 4.1 Protection control code 4.2 Total capacity of IU connected(*) FAN1 FAN2 FAN1 FAN2 4.3 Input/output state of outdoor micro-computer 4.4 Alarm code for abnormal stoppage of compressor 4.5 Inverter order frequency to compressor 4.6 Indoor order frequency to compressor 4.7 Air flow ratio...
  • Page 492 12 Maintenance notes Customer’s name:___________________________________________________________ Date:_______________ RAS-  RAS-   Outdoor unit model (serial No.) (Serial No._______________) (Serial No.________________) 7.5 Cause of IU stoppage 8. Indoor unit (unit number _____________________) 8.1 IU expansion valve opening 8.2 Liquid pipe temperature of IU (Freeze protection) 8.3 IU intake air temperature 8.4 IU discharge air temperature 8.5 Cause of IU stoppage  ...
  • Page 493 12 Maintenance notes 12.5  Service and maintenance record by remote control switch Data sheet for checking by remote control switch Time IU model IU serial number IU number / alarm code Check mode 1 Check mode 2 1·2 1·2 1·2 1·2 1·2 B Temperature indication Set temperature Inlet air temperature Discharge air temperature Liquid pipe temperature Remote thermistor temperature...
  • Page 494 12 Maintenance notes 12.6  Pump-down method for replacing the compressor Procedure Remarks Turn off the main switch of the outdoor unit. — Make sure that the terminal part of the detached power Remove the covers the thermistor the crankcase heater the supply wires is not exposed by the winding insulation tape power wirings and other items according to the chapter 10.
  • Page 495 12 Maintenance notes Procedure Remarks Perform the replacement of the compressor and the change of the refrigerant oil according to the section “replacing the Make sure that you follow the instructions. compressor”. If you collect the refrigerant only on the low-pressure side Perform the vacuum from the check joint of the low-pressure (A in 10).
  • Page 498 Hitachi Air Conditioning Products Europe, S.A.U. Ronda Shimizu, 1 - Polig. Ind. Can Torrella 08233 Vacarisses (Barcelona) Spain Hitachi certifies that our products have met EU consumer safety, health and environmental requirements. Hitachi Air Conditioning Products Europe, S.A.U. is certified with:...

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