Hitachi RAS-2-HVNP Service Manual
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Hitachi RAS-2-HVNP Service Manual

Utopia ivx premium / ivx standard h(v)n(p/c)(e) series
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Table of Contents

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

Service Manual

RAS-(2-6)HVNP(E)
RAS-(4-12)HNP(E)
RAS-(3-6)HVNC(E)
RAS-(4-12)HNC(E)

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Summary of Contents for Hitachi RAS-2-HVNP

  • Page 1: Service Manual

    UTOPIA IVX PREMIUM / IVX STANDARD SERIES H(V)N(P/C)(E) Service Manual RAS-(2-6)HVNP(E) RAS-(4-12)HNP(E) RAS-(3-6)HVNC(E) RAS-(4-12)HNC(E)

  • Page 3: Contents

    Contents C o n t e n t s 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 Maintenace notes SMGB0079 rev.0 - 01/2013...

  • Page 5: Table Of Contents

    General Index Index Contents ..........................i 1. 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 ..........................2 1.2 Safety................................3 1.2.1 Applied symbols .............................. 3 1.2.2 Norms and Regulations ........................... 3 1.3 Product guide .............................

  • Page 6: Piping Work And Refrigerant Charge

    General Index 3. Piping work and refrigerant charge ................51 3.1 General notes before performing pipe work ..................... 52 3.1.1 Piping Materials ............................. 52 3.1.2 Three principles on refrigerant piping work ....................54 3.1.3 Suspension of refrigerant piping ........................54 3.1.4 Brazing work ..............................

  • Page 7: Control System

    General Index 4.3.1 Quantity and position of DIP switches ......................92 4.3.2 Function of the of DIP switches and RSW switches ..................93 4.3.3 Jumpers ................................. 97 4.3.4 LED’s indication ............................. 97 4.4 Common wiring ............................98 4.4.1 Electrical wiring between outdoor and indoor unit ..................98 4.4.2 Wire size ................................

  • Page 8: Troubleshooting

    General Index 5.4.1 Cooling operation ............................128 5.4.2 Dry operation ............................... 130 5.4.3 Heating operation ............................132 5.4.4 Automatic cooling and heating operation ....................134 5.4.5 Defrost operation control ..........................135 5.5 Standard control functions ........................138 5.5.1 Freezing protection during cooling process or dry operation ..............138 5.5.2 Prevention Control for High Pressure Increase during Cooling Operation ..........

  • Page 9: Spare Parts

    General Index 8.1.3 Abnormal transmission between the remote control switch and the indoor unit .......... 186 8.1.4 Abnormal operation of the devices ......................186 8.2 Troubleshooting procedure ........................192 8.2.1 Alarm display ............................... 192 8.2.2 Alarm codes for the outdoor and indoor units ....................193 8.2.3 Troubleshooting by alarm code for the outdoor and indoor units ..............
  • Page 10 General Index 9.6.1 Cycle and structural parts ..........................308 9.6.2 Electrical parts ............................. 310 9.6.3 Parts name ..............................311 9.7 RAS-12HN(P/C)............................314 9.7.1 Cycle and structural parts ..........................314 9.7.2 Electrical parts ............................. 315 9.7.3 Parts name ..............................316 10. Servicing ........................319 10.1 Introduction ............................323 10.2 Servicing for Outdoor Units RAS-(2-2.5)HVNP and RAS-3HVNC ............
  • Page 11 General Index 10.3.2.5 Removing outdoor fan motor ................... 348 10.3.2.6 Removing electrical box ....................349 10.3.2.7 Removing the compressor ....................350 10.3.2.8 Removing the High pressure switch and Pressure switch for control ......353 10.3.2.9 Opening electrical box (P plate) ..................354 10.3.2.10 Removing Reversing valve coil ..................
  • Page 12 General Index 10.3.4.14 Removing other electrical components ................. 390 10.4 Servicing for Standard Series ....................... 391 10.4.1 Outdoor Units RAS-(4-6)H(V)NCE ......................391 10.4.1.1 Removing service cover ....................391 10.4.1.2 Remove outlet grille ......................391 10.4.1.3 Removing upper cover ....................392 10.4.1.4 Removing bottom service cover and rear cover ..............

  • Page 13: Electrial Checks Of Main Parts

    General Index 10.4.3.6 Removing electrical box ....................426 10.4.3.7 Removing High pressure switch and pressure switch for control ........430 10.4.3.8 Opening electrical box (P-Mounting Plate) ..............430 10.4.3.9 Removing reversing and solenoid valves coils ..............431 10.4.3.10 Removing electronic expansion valve coil ..............432 10.4.3.11 Removing reversing valve .....................
  • Page 14 General Index 12.3 Service and maintenance record ......................460 12.4 Service and maintenance record using the 7-segment display ............461 12.5 Service and maintenance record by remote control switch ..............463 12.6 Pump-down method for replacing the compressor ................464 SMGB0079 rev.0 - 01/2013...

  • Page 15: General Information

    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 ........................... 2 1.2.

  • Page 16: General Information

    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: Safety

    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 18: Product Guide

    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 19: Product Guide: Outdoor Units

    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-2HVNP 60288519 RAS-2.5HVNP 60288520 RAS-3HVNPE 7E304005 RAS-4HVNPE 7E304007 RAS-4HNPE 7E304107 RAS-5HVNPE 7E304008 RAS-5HNPE 7E304108 RAS-6HVNPE 7E304009 RAS-6HNPE 7E304109...

  • Page 20: Outdoor Unit Accessory Code List

    Snow protection hood; air inlet of left side (Stainless plate) ASG-NP335L Snow protection hood; air inlet of left side (Zinc plate) 60291435 ASG-NP335LS2 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. SMGB0079 rev.0 - 01/2013...

  • Page 21: Product Guide: Indoor Units & Complementary Systems

    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 RCI-1.0FSN3Ei 7E403014 RCI-1.0FSN3 60278119 RCIM-0.8FSN2 60278010 RCI-1.5FSN3Ei 7E403015 RCI-1.5FSN3 60278120 RCIM-1.0FSN2 60278011 RCI-2.0FSN3Ei 7E403016 RCI-2.0FSN3 60278121 RCIM-1.5FSN2 60278013 RCI-2.5FSN3Ei...
  • Page 22 1. General information •    RCD and RPC indoor units FSN2(E) indoor units 2-way cassette Ceiling type Unit Code Unit Code RCD-1.0FSN2 60278029 RCD-1.5FSN2 60278030 RCD-2.0FSN2 60278031 RPC-2.0FSN2E 7E440003 RCD-2.5FSN2 60278032 RPC-2.5FSN2E 7E440004 RCD-3.0FSN2 60278033 RPC-3.0FSN2E 7E440005 RCD-4.0FSN2 60278034 RPC-4.0FSN2E 7E440007 RCD-5.0FSN2 60278035 RPC-5.0FSN2E 7E440008...
  • Page 23 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 24: Product Guide: Complementary Systems

    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 RPK-1.0FSN3M 60278147 RPF-1.0FSN2E 7E450001 RPFI-1.0FSN2E 7E460001 RPK-1.0FSNH3M 60278155 RPK-1.5FSN3M 60278148 RPF-1.5FSN2E 7E450002 RPFI-1.5FSN2E 7E460002 RPK-1.5FSNH3M...
  • Page 25 1. General information    DX-Interface Control box Expansion valve box DX-Interface Model Code EXV-2.0E1 7E610900 EXV-2.5E1 7E610901 EXV-3.0E1 7E610902 EXV-4.0E1 7E610903 EXV-5.0E1 7E610904 EXV-6.0E1 7E610905 EXV-8.0E1 7E610906 EXV-10.0E1 7E610907 SMGB0079 rev.0 - 01/2013...

  • Page 27: Unit Installation

    2. Unit Installation . U n i t I n s t a l l a t i o n Index 2.1. Safety summary ............................ 14 2.2. Transportation of outdoor unit ....................... 15 2.3. Center of gravity ............................ 16 2.4. Factory-supplied accessories for RAS-12HN(P/C) ................

  • Page 28: Safety Summary

    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 •...

  • Page 29: Transportation Of Outdoor Unit

    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 30: Center Of Gravity

    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 31: Factory-Supplied Accessories For Ras-12Hn(P/C)

    2. Unit Installation 2.4 Factory-supplied accessories for RAS-12HN(P/C) Make sure that the following accessories are packed with the unit. N O T E If any of these accessories are not packed with the unit please contact your dealer. Accessory Quantity Pipe with Flare Nut for Refrigerant Piping SMGB0079 rev.0 - 01/2013...

  • Page 32: Installation Space (Initial Ckeck)

    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-2HVNP - RAS-2.5HVNP - RAS-3HVNC ≥ ≥    All models (except RAS-2HVNP - RAS-2.5HVNP - RAS-3HVNC) ≥ ≥ Units in mm. SMGB0079 rev.0 - 01/2013...

  • Page 33: Ras-(2-2.5)Hvnp / Ras-3Hvnc

    2. Unit Installation 2.5.2  RAS-(2-2.5)HVNP / RAS-3HVNC a) In case of front side and either of the sides are open (single unit) b) In case that surrounding wall exist (single unit) 1000 c) In case that upper side obstacles exist (single unit) ≤...

  • Page 34: Ras-3Hvnpe / Ras-(4-6)H(V)N(P/C)E / Ras-(8-10)Hn(P/C)E / Ras-12Hn(P/C)

    2. Unit Installation 2.5.3   RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C) (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 left Allow 100 mm of space between units. Leave open both right and left sides are open.
  • Page 35 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. Leave open both right and left Be sure to use the fan direction guide.
  • Page 36 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 installation Close the part A not to allow the outlet air bypassed. Install to avoid the allowed up to two units.

  • Page 37: Place Provision

    2. Unit Installation 2.6 Place provision 2.6.1  Place provision for RAS-(2-2.5)HVNP / RAS-3HVNC 1 Secure the outdoor unit with the anchor 1. Base of outdoor unit 2. Nut 3. Special washer (M12) 4. Anchor bolts 5. Filled mortar 6. Concrete A. Max. 17 mm Fix the outdoor unit to the anchor bolts by special washer of factory-supplied accessory. 2 When installing the outdoor unit fix the unit by anchor bolts.Regarding the location of fixing holes.
  • Page 38 2. Unit Installation 4 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. When installing the outdoor unit on a field-supplied frame use metal plates to adjust the frame width for stable installation as shown in Figure.

  • Page 39: Place Provision For Ras-3Hvnpe / Ras-(4-6)H(V)N(P/C)E / Ras-(8-10)Hn(P/C)E / Ras-12Hn(P/C)

    2. Unit Installation 2.6.2  Place provision for RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E /   RAS-12HN(P/C)    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 40 2. Unit Installation Recommended Metal Plate Size • (Field-Supplied) Material: Hot-Rolled Mild Steel. 4-C10 • Plate (SPHC) Plate Thickness: 4.5 T. RAS-3HVNPE Model RAS-(4-6)H(V)N(P/C)E 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 41 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 42 2. Unit Installation    Installing location where the unit will be exposed to strong wind Follow the instructions below to install on the roof or in a place which is not surrounded by buildings and where the product may be buffeted by strong winds. 1 Select a place where the input or outlet side of the product is exposed to strong winds. 2 When the outlet is exposed to strong winds: Strong direct winds may cause a lack of air flow and negative effects on the unit operation.

  • Page 43: Optional Parts And Installation

    2. Unit Installation 2.7 Optional parts and installation 2.7.1  Optional parts and installation for RAS-(2-2.5)HVNP / RAS-3HVNC    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...
  • Page 44 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 gui- 1 Outdoor Unit 2 Hole (4 locations) One flow guide installation Air discharge grille Air flow 3 Outdoor unit...
  • Page 45 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 46 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)
  • Page 47 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 •...

  • Page 48: Optional Parts And Installation Ras-3Hvnpe / Ras-(4-6)H(V)Nce

    2. Unit Installation 2.7.2  Optional parts and installation RAS-3HVNPE / RAS-(4-6)H(V)NCE    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 Air inlet of rear side ASG-NP80B Zinc plate Air inlet of side face ASG-NP80L Air outlet ASG-NP335F52 Air inlet of rear side ASG-NP160BS2 Snow protection hood...
  • Page 49 2. Unit Installation One flow guide installation 1 Air discharge grille 2 Air flow 3 Air flow guide 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.
  • Page 50 2. Unit Installation    Wind guard Specifications Model WSP-335A Quantity 1per 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 51 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)
  • Page 52 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.

  • Page 53: Optional Parts And Installation Ras-(4-6)H(V)Npe / Ras-(8-10)Hn(P/C)E

    2. Unit Installation 2.7.3  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 54 2. Unit Installation Two flow guides installation 1 Air discharge grille 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.
  • Page 55 2. Unit Installation    Wind guard Specifications Model WSP-335A Quantity 2 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 56 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...
  • Page 57 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.
  • Page 58 2. Unit Installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood ASG- Model ASG-NP335F ASG-NP335FS2 ASG-NP280B ASG-NP280BS2 ASG-NP280L NP280LS2 Quantity 2 per unit 1 per unit Bonderized steel Bonderized steel Bonderized steel Stainless Stainless Stainless...

  • Page 59: Optional Parts And Installation Ras-12Hn(P/C)

    2. Unit Installation 2.7.4  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 60 2. Unit Installation Two flow guides installation 1 Air discharge grille 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) •...
  • Page 61 2. Unit Installation    Wind guard Specifications Model WSP-335A Quantity 2 per unit Galvanized sheet metal + Material baked painting Color Gray (1.0Y8.5/0.5) Weight 5.5 kg Fixing screw x 4 Accessories [M5 (SUS) x 12] Installation manual “Guard net” “Air flow guide” or “Snow Installation restriction protection hood”...
  • Page 62 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...
  • Page 63 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 64 2. Unit Installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood ASG- Model ASG-NP335F ASG-NP335FS2 ASG-NP335B ASG-NP335BS2 ASG-NP335L NP335LS2 Quantity 2 per unit 1 per unit Bonderized steel Bonderized steel Bonderized steel Stainless Stainless Stainless...

  • Page 65: Piping Work And Refrigerant Charge

    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 ..................52 3.1.1.

  • Page 66: General Notes Before Performing Pipe Work

    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 per- formed. 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 67 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 contamination.

  • Page 68: Three Principles On Refrigerant Piping Work

    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 69: Brazing Work

    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 leak- age 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 70: Piping Connection For Outdoor Unit

    3. Piping work and refrigerant charge 3.2 Piping connection for outdoor unit 3.2.1  RAS-(2-2.5)HVNP / RAS-3HVNC 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 71: Ras-3Hvnpe / Ras-(4-6)H(V)N(P/C)E / Ras-(8-10)Hn(P/C)E / Ras-12Hn(P/C)

    3. Piping work and refrigerant charge 3.2.2  RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / 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 72 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 RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E RAS-12HN(P/C) Right-SIde Piping Hole Right side piping hole Front piping hole Front-SIde Piping Hole Front piping hole Rigth side...

  • Page 73: Rear Cover

    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 74: Outdoor Unit Stop Valve

    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 75 3. Piping work and refrigerant charge Hexagonal wrench size used for spindle valve: 3HP, 4-6 HP Premium, (*) Size 2HP, 2.5HP 4-6HP Standard 8-12HP Gas valve 4 mm 5 mm Liquid valve 4 mm 4 mm 4 mm Do not apply two spanners at this position.

  • Page 76: Refrigerant Piping Range

    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 77 3. Piping work and refrigerant charge    Maximum refrigerant piping length IVX Premium series Outdoor Unit 2.5HP 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) 3 units (A+B+C+D) Total piping length 4 units (A+B+C+D+E+F+G+)
  • Page 78 3. Piping work and refrigerant charge IVX Standard series Outdoor Unit 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) 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...

  • Page 79: Piping System For Line Branch

    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 quantity IVX Standard 2 - 4 allowed (picture is as example) ...

  • Page 80: Combinations Of Piping Size And Piping Length

    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 Performance capacity 2 HP 2.5 HP 3 HP (1)(2) 4 - 5 - 6 (3) (4) 8 HP...

  • Page 81: Refrigerant Piping Size And Multikit/Distributor Selection

    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 ca- rrying 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 82 Ø9.52 TW-52AN =4HP: TE-04N1 are 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 SMGB0079 rev.0 - 01/2013...
  • Page 83 3. Piping work and refrigerant charge Line branch system (mm) Multi-kit model A Multi-kit model B Pipe Size (D) IVX Premium Series IVX Standard Series IVX Premium Series IVX Standard Series Outdoor Unit HP Liquid 3 / 4 / 5 / 6 Ø15.88 Ø9.52 E-102SN2...

  • Page 84: System Installation

       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 85: Connecting Flare Adapter

    3. Piping work and refrigerant charge 3 Correct position of distributor (available also for quad installation) • This is the correct position: Branch pipe Refrigerant di- G r e a t e r rection than 0.5 m Main pipe Main pipe Refrigerant direction Down •...

  • Page 86: Refrigerant Charge

    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.

  • Page 87: Caution Of The Pressure By Check Joint

    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 88: Refrigerant Charge Quantity

    3. Piping work and refrigerant charge 3.4.2  Refrigerant charge quantity Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length. 1 The additional refrigerant quantity should be determined and charged into the system according to the following pro- cedure.
  • Page 89 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.
  • Page 90 3. Piping work and refrigerant charge Step 3: Calculation of total additional refrigerant charge (W (kg)) • For all UTOPIA units except RAS-(8-12)HN(P/C)(E) Put weight W and W calculated in step 1 and step 2 into the following formula: W = W System example (W) = • For UTOPIA units RAS-(8-12)HN(P/C)(E) In case of RAS-(8-12)HN(P/C)(E), it must be used the following formula: W = W System example (W) =...
  • Page 91 3. Piping work and refrigerant charge    Setting of pipe length DSW.  DSW2 setting will be required only when the refrigerant pipe length is shorter than 5 m or longer than 30 m. Pipe length setting shall be performed as shown below. (The ■...

  • Page 92: Caution In Case Of Refrigerant Leakage

    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.

  • Page 93: Piping Work For Compatibility With The Piping Of Current Installations Where Is Used R22 Or R407C

    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. SMGB0079 rev.0 - 01/2013...

  • Page 94: Permissible Range For Existing Air-Conditioning Pipes

    3. Piping work and refrigerant charge 3.6.3  Permissible 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 Draw Performance capacity 2 HP...

  • Page 95: Renewal Kit Selection Model

    3. Piping work and refrigerant charge 3.6.4  Renewal kit selection model Hitachi offers, as an accessory, a renewal kit:    Recommended renewal kit Renewal Kit Renewal Kit External Attachment to Internal Attachment to External Attachment Internal Attachment to Outdoor Unit Outdoor Unit to Outdoor Unit Outdoor Unit IVX Premium...
  • Page 96 3. Piping work and refrigerant charge Model TRF-NP160U Pipe For liquid pipe Pipe connecting port Pipe connecting port for O.U for I.U (Flare connection) (Flare connection) For gas pipe Pipe connecting port Pipe connecting port for O.U for I.U (Flare connection) (Flare connection) O.U.: Outdoor Unit I.U.: Indoor Unit...
  • Page 97    Renewal kit installation (Example) RAS-(2/2.5)HVNP - RAS-3HVNC 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 - RAS-(4-6)H(V)NCE Field-Supplied pipes (with insulation) Strainer for liquid pipe (with accessory insulation) Put tape on insulation crossover...
  • Page 98 3. Piping work and refrigerant charge RAS-12HV(P/C) Existing refrigerant pipe (Outlet on the rear side) Existing refrigerant pipe (Brazing connection) Strainer for liquid pipe Flare connection Strainer for gas pipe Brazing connection Elbow connection (Field-Supplied) Existing refrigerant pipe (Outlet on the rear side) Existing refrigerant pipe (Outlet on the rear side) N O T E...

  • Page 99: Drain Piping

    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)HVNP...

  • Page 101: Electrical Wiring

    4. Electrical wiring . E l e c t r i c a l w i r i n g Index 4.1. General notes ............................88 4.1.1. General check ............................88 4.2. Electrical wiring connection for the outdoor unit ..................90 4.3.

  • Page 102: General Notes

    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 in- door 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 unpro- tected 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 stan- dards, 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 103 4. Electrical wiring MODEL Z max (Ω) MODEL Z max (Ω) RAS-2HVNP RAS-2.5HVNP RAS-3HVNPE 0.39 RAS-3HVNC RAS-4HVNPE 0.27 RAS-4HVNCE 0.27 RAS-5HVNPE RAS-5HVNCE 0.27 0.27 RAS-6HVNPE RAS-6HVNCE 0.27 0.27 RAS-4HNPE RAS-4HNCE RAS-5HNPE RAS-5HNCE RAS-6HNPE RAS-6HNCE 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 MODEL...

  • Page 104: Electrical Wiring Connection For The Outdoor Unit

    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 Insert the power source cables L1, L2, L3 and N (for 400V/50Hz) or L1 and N (for 230V/50Hz ) and the ground cable into the ring core, coiling them with two turns and fix the cables using the cable tie (accessory).
  • Page 105 4. Electrical wiring 3 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. Control cable (5V). 2. Control cable (5V). 4 Fix the cable with the clamp supplied in the Electrical Box to ensure strain relief.

  • Page 106: Setting The Dip Switches For The Outdoor Unit

    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)HVNP / RAS-3HVNC PCB2 PCB1 RAS-(3-12)H(V)N(P/C)(E) SMGB0079 rev.0 - 01/2013...

  • Page 107: Function Of The Of Dip Switches And Rsw Switches

    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)HVNP and RAS-3HVNC units): Test run mode Setting before shipment 1 2 3 4 5 6 Cooling Heating Forced stop of compressor DSW1  (Only RAS-(2/2.5)HVNP and RAS-3HVNC units): No setting is required When set pin number 1 to ON, the electric current detection is cancelled.

  • Page 108: Optional Functions

    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 Optional function setting 1 2 3 4 5 6 External input/output setting mode DSW3: Capacity setting (no setting is required) Factory setting...
  • Page 109 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 110 4. Electrical wiring 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 Unit Indoor Unit Indoor Unit Indoor Unit DSW6: Setting of multiple indoor units operation (setting is required)

  • Page 111: Jumpers

    4. Electrical wiring 4.3.3  Jumpers Jumper lead setting (JP1~6) Setting before shipment: System Single phase (1~) Three-phase (3N~) 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 Details...

  • Page 112: Common Wiring

    4. Electrical wiring 4.4 Common wiring 4.4.1  Electrical wiring between outdoor and indoor unit • Connect the electrical wires between the 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 113: Wire Size

    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-2HVNP 2.5 mm²...
  • Page 114 4. Electrical wiring    Main switch protection Select the main switches in according to the next table: ELB (no. Model Power supply Max. current (A) CB (A) poles/A/mA) All Indoor Units 1~ 230V 50Hz 2/40/30 ELB: Earth switch; CB: Circuit braker IVX Premium series Outdoor unit MC (A)

  • Page 115: H-Link Ii System

    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. •...

  • Page 116: Dip Switch Setting For Twin, Triple And Quad Systems

    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 No.

  • Page 117: Examples Of The System Of Connection Between H-Link And H-Link Ii Units

    4. Electrical wiring Unit Name of DIP switch Mark Setting before the Shipment Function For setting the refrigerant cycle address of the outdoor unit. Set the DSW4 Refrigerant cycle DSW4 and RSW1 to overlap the set- RSW1 ting of other outdoor units in the same H-LINK system.

  • Page 118: Examples Of H-Link Ii System

    4. Electrical wiring 4.5.5  Examples of H-LINK II system Two cases: 1. Using 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 119 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 Uto- pia 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 wiring of the instrument is completed. The DIP switches must therefore be set as specified in the DIP switches on the PCB. 2. Using the H-LINK II system for air conditioning systems with a central control device (CSNET WEB or PSC- A64S) •...

  • Page 120: System Control

    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. Remote Control Switch ( The factory setting position is (PC-ARF) for the individual operation.) 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 121: Simultaneous Operation

    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 122: Electrical Wiring Diagrams

    4. Electrical wiring 4.7 Electrical wiring diagrams 4.7.1  RAS-(2-2.5)HVNP / RAS-3HVNC (1~ 230V 50Hz) 317S139290 / 317S139291 /317S139294 SMGB0079 rev.0 - 01/2013...

  • Page 123: Ras-3Hvnpe (1~ 230V 50Hz)

    4. Electrical wiring 4.7.2  RAS-3HVNPE (1~ 230V 50Hz) XEK01261_0 SMGB0079 rev.0 - 01/2013...

  • Page 124: Ras-(4-6)Hvnpe (1~ 230V 50Hz)

    4. Electrical wiring 4.7.3  RAS-(4-6)HVNPE (1~ 230V 50Hz) XEK01262_0 SMGB0079 rev.0 - 01/2013...

  • Page 125: Ras-(4-6)Hnpe (3N~ 400V 50Hz)

    4. Electrical wiring 4.7.4  RAS-(4-6)HNPE (3N~ 400V 50Hz) XEK01263_1 SMGB0079 rev.0 - 01/2013...

  • Page 126: Ras-(4-6)Hvnce (1N~ 230V 50Hz)

    4. Electrical wiring 4.7.5  RAS-(4-6)HVNCE (1N~ 230V 50Hz) XEK01264_2 SMGB0079 rev.0 - 01/2013...

  • Page 127: Ras-(4-6)Hnce (3N~ 400V 50Hz)

    4. Electrical wiring 4.7.6  RAS-(4-6)HNCE (3N~ 400V 50Hz) XEK01265_1 SMGB0079 rev.0 - 01/2013...

  • Page 128: Ras-(8-10)Hn(P/C)E (3N~ 400V 50Hz)

    4. Electrical wiring 4.7.7  RAS-(8-10)HN(P/C)E (3N~ 400V 50Hz) XEK01288_0 SMGB0079 rev.0 - 01/2013...

  • Page 129: Ras-12Hnp (3N~ 400V 50Hz) - Preliminary Data

    4. Electrical wiring 4.7.8  RAS-12HNP (3N~ 400V 50Hz) - Preliminary data 317S136064 SMGB0079 rev.0 - 01/2013...

  • Page 130: Ras-12Hnc (3N~ 400V 50Hz) - Preliminary Data

    4. Electrical wiring 4.7.9  RAS-12HNC (3N~ 400V 50Hz) - Preliminary data 317S136071 SMGB0079 rev.0 - 01/2013...

  • Page 131: Control System

    5. Control System . C o n t r o l S y s t e m Index 5.1. Device control system ......................... 118 5.2. Outdoor units PCB ..........................120 5.2.1. RAS-(2-2.5)HVNP / RAS-3HVNC ......................120 5.2.2. RAS-3HVNPE ............................121 5.2.3.

  • Page 132: Device Control System

    5. Control System 5.1 Device control system Purpose Control subject Cooling operation Heating operation Defrost operation The frequency control is determined The frequency control is determined with the next parameters: with the next parameters: Fixed frequency • Ratio (I.U. capacity/O.U. ca- •...
  • Page 133 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 134: Outdoor Units Pcb

    5. Control System 5.2 Outdoor units PCB 5.2.1  RAS-(2-2.5)HVNP / RAS-3HVNC 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...

  • Page 135: Ras-3Hvnpe

    5. Control System 5.2.2  RAS-3HVNPE Connector indication Switch indication PCN1 Fuse 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 136: Ras-(4-6)H(V)Npe

    5. Control System 5.2.3  RAS-(4-6)H(V)NPE Connector indication Switch indication PCN1 Fuse DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN7 Solenoid valve DSW3 Capacity code PCN8 High pressure switch protection DSW4/ Refrigerant cycle number RSW1 PCN9 Compressor contactor DSW5...

  • Page 137: Ras-(4-6)H(V)Nce

    5. Control System 5.2.4  RAS-(4-6)H(V)NCE Connector indication Switch indication PCN1 Fuse DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN6 4-way solenoid valve DSW3 Capacity code PCN7 Solenoid valve DSW4/ Refrigerant cycle number RSW1 PCN8 High pressure switch protection DSW5 Switch...

  • Page 138: Ras-(8-10)Hn(P/C)E

    5. Control System 5.2.5  RAS-(8-10)HN(P/C)E PCB1 PCB3 PCB1 Connector indication PCB1 Switch indication Connector Name Connector Name PCN1 Fuse DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN7 Solenoid valve DSW3 Capacity code PCN8 High pressure switch protection DSW4/ Refrigerant cycle number RSW1...

  • Page 139: Ras-12Hnp - Preliminary Data

    5. Control System 5.2.6  RAS-12HNP - Preliminary data Connector indication Switch indication PCN1 Fuse DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN7 Solenoid valve DSW3 Capacity code PCN8 High pressure switch protection DSW4/ Refrigerant cycle number RSW1 PCN9 Compressor contactor DSW5...

  • Page 140: Ras-12Hnc - Preliminary Data

    5. Control System 5.2.7  RAS-12HNC - Preliminary data Connector indication Switch indication PCN1 Fuse DSW1 Test run PCN5 Crankcase heater of compressor (oil) DSW2 Auxiliary function setting PCN6 4-way solenoid valve DSW3 Capacity code PCN7 Solenoid valve DSW4/ Refrigerant cycle number RSW1 PCN8 High pressure switch protection DSW5 Switch...

  • Page 141: Protection And Safety Control

    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 Oil heater energized while the compressor is stopped.

  • Page 142: Standard Operation Sequence

    5. Control System 5.4 Standard operation sequence 5.4.1  Cooling operation RAS-(2-2.5)HVNP 60ºC) (for 75ºC RAS-3HVNC RAS-(2-2.5)HVNP 60ºC) (for 75ºC RAS-3HVNC 12HN(P/C) 25ºC 15ºC 25ºC 15ºC Power to Y52C or RY : ON Continues in the next page. SMGB0079 rev.0 - 01/2013...
  • Page 143 5. Control System Td target temp. -15ºC RAS-(2-2.5)HVNP <60ºC) (for RAS-3HVNC Td target temp. -10ºC RAS-(2-2.5)HVNP 60ºC) (for RAS-3HVNC Power to Y52C or RY : ON COOL SMGB0079 rev.0 - 01/2013...

  • Page 144: Dry Operation

    5. Control System 5.4.2  Dry operation Continues in the next page. SMGB0079 rev.0 - 01/2013...
  • Page 145 5. Control System Td target temp. -15ºC RAS-(2-2.5)HVNP <60ºC) (for RAS-3HVNC Td target temp. -10ºC RAS-(2-2.5)HVNP 60ºC) (for RAS-3HVNC Power to Y52C or RY : ON SMGB0079 rev.0 - 01/2013...

  • Page 146: Heating Operation

    5. Control System 5.4.3  Heating operation RAS-(2-2.5)HVNP <60ºC) (for 75ºC RAS-3HVNC RAS-(2-2.5)HVNP 60ºC) (for 75ºC RAS-3HVNC 12HN(P/C) 25ºC 15ºC 25ºC 15ºC -1ºC in Power to Y52C or RY : ON <90Hz After 3 to 48 sec. Power to demand YH2:OFF frequency 90Hz Power to YH2:ON...
  • Page 147 5. Control System Td target temp. -15ºC RAS-(2-2.5)HVNP <60ºC) (for RAS-3HVNC Td target temp. -10ºC RAS-(2-2.5)HVNP 60ºC) (for RAS-3HVNC Power to Y52C or RY : ON IU Air outlet temperature Higher than 50ºC HEAT SMGB0079 rev.0 - 01/2013...

  • Page 148: Automatic Cooling And Heating Operation

    5. Control System 5.4.4  Automatic cooling and heating operation SMGB0079 rev.0 - 01/2013...

  • Page 149: Defrost Operation Control

    5. Control System 5.4.5  Defrost operation control Power to YH2:ON RAS-(2-2.5)HVNP / RAS-3HVNC * DSW2-1 ON (and DSW2-2ON for RAS-2.5HVNP) After 90 After 30 seconds * seconds Other than above <90Hz Power to demand YH2:OFF frequency 90Hz Power to YH2:ON SMGB0079 rev.0 - 01/2013...
  • Page 150 5. Control System    Defrosting Operation The following defrosting operations, “Standard Defrost”, “Forced Defrost” and “Manual Defrost” are available. 1 Standard Defrost This operation is started according to the outdoor temperature, the outdoor evaporating temperature and operating time. 2 Forced Defrost This operation starts when the indoor unit is operated Thermo-ON/OFF repeatedly and the standard defrost is not used.
  • Page 151 5. Control System N O T E For RAS-(2-2.5)HVNP / RAS-3HVNC: • (*1) More than 39 minutes. • (*2) If outdoor temperature is less than -6ºC then the compressor is operated continuously for more than 2 minutes. If outdoor temperature is more than -6ºC then the compressor is operated continuously for more than 9 minutes. • (*3) Less than 6ºC.    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 25 C (*1) for 2 minutes from starting the defrosting operation.

  • Page 152: Standard Control Functions

    5. Control System 5.5 Standard control functions 5.5.1  Freezing protection during cooling process or dry operation Cooling or Dry Operation Cooling or Dry Operation SMGB0079 rev.0 - 01/2013...

  • Page 153: Prevention Control For High Pressure Increase During Cooling Operation

    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 154: Prevention Control For Excessively High Discharge Gas Temperature

    5. Control System 5.5.3  Prevention control for excessively high discharge gas temperature <60ºC 60ºC CMC: ON 35ºC 35ºC demand frequency >90Hz Heater control for Indoor Unit SMGB0079 rev.0 - 01/2013...

  • Page 155: Activation For Protection Device Control

    5. Control System 5.5.4  Activation for protection device control Current of the Blow EHW fuse EHW circuit > 10A or >20A SMGB0079 rev.0 - 01/2013...

  • Page 156: Preheating Control Of Compressor

    5. Control System 5.5.5  Preheating control of compressor RAS-(2-2.5)HVNP / RAS-3HVNC During stopping and operating compressor Other than above During stopping compressor During operating compressor SMGB0079 rev.0 - 01/2013...

  • Page 157: Prevention Control For High Pressure Increase

    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+4 °C, forced thermo-off operation will be performed.

  • Page 159: Optional Functions

    6. Optional functions . O p t i o n a l f u n c t i o n s Index 6.1. Optional input and output signals (By 7-segment display) ..............146 6.1.1. Available ports ............................146 6.1.2. Available optional signals ........................148 6.1.3.

  • Page 160: Optional Input And Output Signals (By 7-Segment Display)

    6. Optional functions 6.1 Optional 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 161 6. Optional functions    Specification of the components for a correct installation Component Manufacturer or specifications Remarks OMRON mini power relay model: Auxiliary relay (X3) Voltage between relay terminals 12 Vdc - 75 mA MY1F or equivalent (SS1) (x1), (x2) contact example Manual type Voltage between terminals of the 230V - 5 mA contactor Optional part PCC-1A (capable of con- 3P connector cable Five wires with connectors as one set...

  • Page 162: Available Optional Signals

    6. Optional functions 6.1.2  Available optional 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.    RAS-(2-2.5)HVNP / RAS-3HVNC Input signals Ind. Input signal Application Port No setting application No setting...
  • Page 163 6. Optional functions    RAS-3HVNPE / RAS-(4-12)H(V)N(P/C)(E)  Input signals Ind. Input signal Application Port 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. If the indoor units Fixing the heating mode CN1 and CN2 request the oposite mode than the outdoor unit, the compressor will not start.

  • Page 164: Setting Of The Optional Signals

    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 165: Description Of Optional Signals

    6. Optional functions 6.1.4  Description of optional signals    Input signals RAS-(2-2.5)HVNP / RAS-3HVNC 1 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 166 6. Optional functions RAS-3HVNPE / RAS-(4-12)H(V)N(P/C)(E)  1 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. Short circuit between the terminals 1 and 2 of CN1: set heating mode.
  • Page 167 6. Optional functions    Output signals 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 Available ports.

  • Page 168: Optional Functions (By 7-Segment Display)

    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 169 6. Optional functions IVX Premium   ↓ ↑   ↓ ↑ SEG2 SEG1 SEG2 SEG1 Indoor exp. valve ope- Not Available Control of the indoor ning change for stoppa- Not Available unit fan during Thermo- ge indoor unit in heating OFF in heating mode mode 1 or 2 (for 3 to 12HP)
  • Page 170 6. Optional functions IVX Standard   ↓ ↑   ↓ ↑ 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 Not Available opening change for Night mode (Low noise) Thermo-OFF indoor unit...

  • Page 171: Description Of The Optional Functions

    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 172 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 173 6. Optional functions Slo 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 174 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 Descrip- tion of optional signals in the input...

  • Page 175: Optional Functions (By Remote Control Switch)

    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 one of the HITACHI remote control switches (PC-ART) is shown below: N O T E • Please, refer to the Controller’s Technical Catalogue for the specific information about the optional functions...
  • Page 176 6. Optional functions Individual Setting Items Optional function Contents setting condition Not prepared “- -” Fixed Not used Not used Not prepared (Use as 00 conditions) Not used Not prepared (Use as 00 conditions) Average static pressure (factory set) Static pressure selection (RPI) High static pressure Low static pressure ○...
  • Page 177 6. Optional functions Individual Setting Items Optional function Contents setting condition Automatic ventilation KPI: Ventilation mode Ventilation with total heat exchanger ○ Ventilation with bypass (No total heat exchange) Not available Econofresh: all fresh mode 01/02 All fresh mode Not available KPI: Increasing air supply volume Available ○...
  • Page 178 6. Optional functions Individual Setting Items Optional function Contents setting condition Function not valid 04-24 (04-24) h Automatic timer OFF setting × 0.5 h 1.5 h 40 mins 45 mins 50 mins 55 mins Master Main and secondary remote control setting ×...
  • Page 179 6. Optional functions Individual Setting Items Optional function Contents setting condition Standard Lower limit +1ºC Lower limit +2ºC Cooling lower limit for setting temperature (*4) × Lower limit +9ºC Lower limit +10ºC Standard Upper limit –1ºC Upper limit –2ºC Heating upper limit for setting temperature (*5) ×...
  • Page 180 6. Optional functions Individual Setting Items Optional function Contents setting condition Not available Not prepared (Use as 00 condition) Not available Not prepared (Use as 00 condition) Not available Not prepared (Use as 00 condition) Not available Not prepared (Use as 00 condition) Not available Not prepared (Use as 00 condition)

  • Page 181: Test Run

    7. Test run . Te s t r u n Index 7.1. Checking procedure before the test run ....................168 7.2. Test run procedure using the remote control switch (PC-ART) ............170 7.3. Test run procedure using the remote control switch (PC-ARF) ............172 7.4.

  • Page 182: Checking Procedure Before The Test Run

    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 183 7. Test run • Check to ensure the operating temperature: Cooling operation: Š Indoor DB 21.5 ºC and above, Š Indoor WB 16 ºC and above, Š Outdoor DB 0 ºC and above Heating operation: Š Indoor DB 27 ºC 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 184: Test Run Procedure Using The Remote Control Switch (Pc-Art)

    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.
  • Page 185 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 Recovering method of FUSE for flickers.

  • Page 186: Test Run Procedure Using The Remote Control Switch (Pc-Arf)

    7. Test run 7.3 Test run procedure using the remote control switch (PC-ARF) Display Part Schedule Timer Indicator Fan Speed Indicator It is indicated when the schedule timer Swing Louver Room Name function is set. Indicator Indicator Operation Lock Indicator Operation Mode Indicator It is indicated when the operation lock...
  • Page 187 7. Test run Test Run Setting: 2 units COOL MODE SPEED Select “Test Run” and press “OK”. The test run settings will be LOUV. displayed. T-RUN TIME 120MIN SEL. RTN. Test Run Setting: 00 unit MODE COOL SPEED NOTE LOUV. When “00”...

  • Page 188: Troubleshooting

    7. Test run Test Run: 2 units MODE COOL 9 To finish the test run, press “ ” (run/stop) again or pass SPEED over the set test run time. When changing the test run time, LOUV. press “ ” or “ ” to select “T-RUN TIME”. Then, set the test T-RUN TIME 510MIN run time (30 to 600 minutes) by pressing “...

  • Page 189: Test Run Procedure Using The Wireless Remote Control Switch (Pc-Lh3A/B)

    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.
  • Page 190 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 on chapter Troubleshooting. Alarm codes 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 191: Test Run Procedure From The Outdoor Unit Side

    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...
  • Page 192 7. Test run • Do not repeat defrost operation fre-  Manual Defrost Operation  Defrost operation is available regar- quently. dless of frosting condition and total time Starts of heating operation. Press PSW1 for more than 3 se- conds during heating operation, ...

  • Page 193: Check List

    7. Test run 7.6 Check list 7.6.1  Check list on test run MODEL: SERIAL No. COMPRESSOR MFG No. 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 194: Check List On Compressor

    7. Test run 21 Does the drain water flow smoothly from the drain pipe? __________ 7.6.2  Check list on compressor CLIENT: MODEL: DATE: Serial N°: 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 indication of...
  • Page 195 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 &...

  • Page 197: Troubleshooting

    8. Troubleshooting . T r o u b l e s h o o t i n g Index 8.1. Initial troubleshooting .......................... 184 8.1.1. Checking by means of the 7-segment display ..................184 8.1.2. Failure of the power supply to the indoor unit and the remote control switch .......... 185 8.1.3.

  • Page 198: Initial Troubleshooting

    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 199: Failure Of The Power Supply To The Indoor Unit And The Remote Control Switch

    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 200: Abnormal Transmission Between The Remote Control Switch And The Indoor Unit

    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) Check the cable and the connec- Repair the cable or connect the Disconnection or insufficient contacting of the remote control cable tions cable Check the remote control switch...
  • Page 201 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...
  • Page 202 8. Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Indoor cool load is greater than the cooling capac- Calculate the cool load Use a bigger unit Gas leakage or short- Correctly charge the refrigerant Measure superheat age of refrigerant after repairing the gas leakage Excessively small Measure and check the field-...
  • Page 203 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 heat Remove the obstacles the outdoor unit heat exchanger exchanger...
  • Page 204 8. Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Indoor heat load is greater than the heating ca- Replace the unit with a bigger Calculate the heat load pacity unit Correctly charge the refrigerant Gas leakage or insuffi- Measure superheat after the gas leakage check and cient refrigerant charge...
  • Page 205 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...

  • Page 206: Troubleshooting Procedure

    -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. •...

  • Page 207: Alarm Codes For The Outdoor And Indoor Units

    8. Troubleshooting 8.2.2  Alarm codes for the outdoor and indoor units Code Category Type of Abnormality Main cause Failure of fan motor, drain discharge, PCB, relay, float switch Indoor unit Activation of protection device (float switch) activated. Activation of PSH, locked motor, abnormal operation in the Outdoor unit Activation of protection device (high pressure cut) power supply phase.

  • Page 208: Troubleshooting By Alarm Code For The Outdoor And Indoor Units

    8. Troubleshooting 8.2.3  Troubleshooting by alarm code for the outdoor and indoor units Alarm code Activation of the safety device in the indoor 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. •...
  • Page 209 8. Troubleshooting Activation of the safety device (high pressure switch) in the outdoor unit Alarm code (Except Alarm codes 41 and 42) • 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 210 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...
  • Page 211 8. Troubleshooting Abnormal transmission between the indoor units and the outdoor unit for Alarm code RAS-(2-2.5)HVNP / RAS-3HVNC • 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 212 8. Troubleshooting SMGB0079 rev.0 - 01/2013...
  • Page 213 8. Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage by means of Power failure or power is not ON Supply the power the tester Check the insulation material for Remove the short-circuit and Short-circuit between the wires breaks replace the fuse Remove short-circuit to ground...
  • Page 214 8. Troubleshooting Abnormal transmission between the indoor units and the outdoor unit for Alarm code RAS-(3-12)H(V)N(P/C)(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. •...
  • Page 215 8. Troubleshooting SMGB0079 rev.0 - 01/2013...
  • Page 216 8. Troubleshooting Check continuity Replacing Wires, Disconnected Wire and looseness of Repairing and Insufficient Contacting connection screws. Tightening Screws Incorrect Wiring Incorrect Wiring Check terminal Nos. Correctly connect wires. SMGB0079 rev.0 - 01/2013...
  • Page 217 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. • *2) Transmission Setting (SW1) Item Setting Position Left Side (for H-LINK/H-LINK II) • PCB1 output voltage Voltage Vcc 12 –...
  • Page 218 8. Troubleshooting Alarm code Abnormal transmission between Inverter PCB and Outdoor PCB1 • 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 219 8. Troubleshooting RAS-(3-6)H(V)NPE N O T E • *1): Surely perform the troubleshooting of the resistance for inrush current prevention (R115/R116) on inverter PCB. If the resistance for inrush current prevention (R115/R116) fails, the abnormal transmitting occurs. • *2): Surely perform the troubleshooting of DC fan motor according to section Procedure of checking other main parts. If the DC fan motor fails, the normal inverter PCB may be damaged. • *3): Perform the troubleshooting of the fuses “EF1” on O.U. PCB1 and “EF1” on inverter PCB for fan motor protection. If the fuses for fan motor protection fail, DC fan motor is not operated normally. SMGB0079 rev.0 - 01/2013...
  • Page 220 8. Troubleshooting RAS-(8-12)HN(P/C)(E) N O T E Surely perform the troubleshooting of DC fan motor according to section Procedure of checking other main parts. If the DC fan motor fails, the normal inverter PCB may be damaged. SMGB0079 rev.0 - 01/2013...
  • Page 221 8. Troubleshooting Alarm code Code abnormal operation of picking up phase signal • 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 222 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 223 8. Troubleshooting RAS-(3-6)H(V)NPE / RAS-(8-12)HN(P/C)(E) N O T E • The indicated voltage is for three phase models. The power supply voltage for single phase models is 220V and 187V during operation. • *1): If capacitor has high voltage, perform the high voltage discharge work refer to the item Procedure of checking other main parts. • *2): Regarding replacing or checking method for the inverter PCB, refer to the item Procedure of checking other main parts.
  • Page 224 8. Troubleshooting Alarm code Decrease of Discharge Gas Superheat • 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 225 8. Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Check ref. cycle and the Ref. cycle is different from the electrical system Repair wiring electrical system Overcharged Refrigerant Measure pressure Correctly charge refrigerant Replace expansion valve if Faulty Expansion Valve Check expansion valve *1) faulty...
  • Page 226 8. Troubleshooting Alarm code Excessively High Discharge Gas Temperature at the Top of Compressor • 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 227 8. Troubleshooting Alarm code Abnormal operation of thermistor for the indoor unit air inlet temperature (air inlet 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 228 8. Troubleshooting Alarm code Abnormal operation of the thermistor for the indoor discharge air temperature (air outlet 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 229 8. Troubleshooting Abnormal operation of the thermistor for the indoor unit heat exchanger liquid pipe temperature Alarm code (freeze protection 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 230 8. Troubleshooting Abnormal operation of the thermistor for the indoor unit heat exchanger gas pipe temperature (gas Alarm code piping 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 231 8. Troubleshooting Alarm code Activation of the protection device for the indoor fan motor (except RCI, RCIM and RPK) • 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 232 8. Troubleshooting Alarm code Activation of the protection device for the indoor fan motor (RCI, RCIM) • 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 233 8. Troubleshooting Alarm code Activation of the protection device for the indoor fan motor (RPK) • 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 PCB1.
  • Page 234 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 235 8. Troubleshooting Alarm code Abnormality of High pressure sensor for RAS-(3-12)H(V)NP(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 236 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 237 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 238 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 239 8. Troubleshooting Alarm code Incorrect Indoor number setting • The RUN LED flickers and “ALARM” is displayed on the remote control switch. • The unit number, alarm code and unit model code appear alternately on the Set Temperature display of the remote control switch.
  • Page 240 8. Troubleshooting Alarm code Abnormality of Protective Circuit for Protection (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 241 8. Troubleshooting Alarm code Cooling Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP and RAS-3HVNC • 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 242 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 Exchanger 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 ceiling...
  • Page 243 8. Troubleshooting Alarm code Heating Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP and RAS-3HVNC • 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 244 8. Troubleshooting Action Phenomenon Cause Check item (Turn OFF Main Switch) Clogging of Heat Exchanger Check for dust on air filter Remove it Activation of High Pressure Switch Insufficient Air Flow to Heat Check for any obstacle at inlet or due to Excessively High Discharge Exchanger of Indoor Unit outlet of heat exchanger...
  • Page 245 8. Troubleshooting Alarm code Activation of high pressure increase protection device • 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 246 8. Troubleshooting Activation to Protect System from Excessively Low Suction Pressure (Protection from Vacuum Opera- Alarm code tion) • 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 247 8. Troubleshooting Alarm code Overcurrent protection activation for RAS-(2-2.5)HVNP and RAS-3HVNC SMGB0079 rev.0 - 01/2013...
  • Page 248 8. Troubleshooting Alarm code Overcurrent protection activation for RAS-(3-12)H(V)N(P/C)(E) Turn OFF power and disconnect U, V, W from Is there any cause of compressor terminals. Check the Restart operation. instantaneous voltage Turn ON #1 of DSW1 on PCB2 compressor. Does it trip soon? decrease? (IPM or dipIPM) and restart.
  • Page 249 8. Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(2-2.5)HVNP / RAS-3HVNC) • 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 250 8. Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(3-6)H(V)N(P/C)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 251 8. Troubleshooting Alarm code Abnormal operation of the current sensor (RAS-(8-12)HN(P/C)(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 252 8. Troubleshooting Alarm code Activation of transistor module (RAS-(2-2.5)HVNP / RAS-3HVNC) • 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 253 8. Troubleshooting Alarm code Activation of transistor module (RAS-3HVNPE / RAS-(4-6)H(V)NCE) • 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 254 8. Troubleshooting Alarm code Activation of transistor module (RAS-(4-6)H(V)NPE) • 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 255 8. Troubleshooting Compressor stops O.U.: Outdoor Unit immediately. I.U.: Indoor Unit Turn OFF power, (Itc=1, 12)* Normal disconnect U, V, W from compressor Check Failure of Inverter PCB. Restart operation. terminals and restart. the compressor. Replace it. Does the protecting Compressor function activate? *3) Abnormal...
  • Page 256 8. Troubleshooting Alarm code Activation of transistor module (RAS-(8-12)HN(P/C)(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 257 8. Troubleshooting Are the power wires Pass the power passed through wires through CT CT(inverter element)? Check inverter Replace transistor Check transistor and inverter module (*1) (*2) Replace transistor module Is the space between Apply silicon to cover the transistor module entirely the space and radiation fins entirely covered by silicon?
  • Page 258 8. Troubleshooting Alarm code Abnormality of inverter fin temperature (RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)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 259 8. Troubleshooting Alarm code Abnormality of inverter fin temperature (RAS-(8-12)HN(P/C)(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 260 8. Troubleshooting Alarm code Abnormality of Inverter Module • 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 261 8. Troubleshooting Alarm code Abnormality of fan motor protection (DC fan motor) for RAS-(2-2.5)HVNP and RAS-3HVNC • 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 Abnormality of fan motor protection (DC fan motor) Alarm code for RAS-(3-6)H(V)NPE and RAS-(8-12)HN(P/C)(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 Abnormality of fan motor protection (DC fan motor) for RAS-(4-6)H(V)NCE • 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 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 Content of abnormality Tripping of protection device in outdoor unit...
  • Page 265 8. Troubleshooting Alarm code Incorrect Setting of Unit and Refrigerant Cycle No. • 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: Alarm Codes For The Kpi (E/H/X)3E Series And Dx Interface

    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 KIT2 Active Float switch activation (high water level in drain hose or Indoor Activation of protection device abnormality in drain pipe, float switch or drain pan). Outdoor fuse meltdown, Indoor/outdoor connection wir- Transmission Transmission Error ing (breaking, wiring error, etc.)

  • Page 267: Troubleshooting In Check Mode

    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 stoppa- ge while the RUN LED is flickering.
  • Page 268 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. • The above function is available only when the alarm occurs.
  • Page 269 8. Troubleshooting Indication of micro-computer input/output Heating Thermo-ON Micro-computer input/output in C1  indoor unit Alarm 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 Operation OFF, power OFF N O T E 1 Thermo - OFF (NOTE 1), activating float switch Explanation of term,...
  • Page 270 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 occu- E2 00 rrence counter in indoor unit N O T E Transmission error occurrence • If a transmission error continues for three mi- E3 00 counter between remote control nutes, one is added to the occurrence counter.
  • Page 271 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 272 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 273 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 swit- ches for three se- PCB check mode conds Indi- Contents cation Normal (ex.) Indication of unit No.
  • Page 274 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 Connect the PC-ART.
  • Page 275 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.
  • Page 276 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 277: Troubleshooting Using The Remote Controller Pc-Arf

    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 278 8. Troubleshooting Check mode 1 items Item Data Name Item Data Name Set Temp. Times of Abnormal Transmitting Inlet Air Temp. Times of Inverter Tripping Discharge Air Temp. Louver Sensor State Liquid Pipe Temp. Discharge Pressure Remote Thermistor Temp. Suction Pressure Outdoor Air Temp. Control Information Gas Pipe Temp.
  • Page 279 8. Troubleshooting    Checking procedure of PCB by means of the Remote Control Switch Check Menu (1) Press and hold “ ” (menu) and “?” (help) simultaneously I. U./O. U. PCB Check for 3 seconds during the normal mode. The check menu is displayed. Self Checking (2) Select “I.U./O.U. PCB Check” from the check menu and press “OK”.
  • Page 280 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 Check Menu 3 seconds during the normal mode (when unit is not operated).
  • Page 281 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 282: Troubleshooting Using The 7 Segment Display

    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 Reverse connection of the operating line between the outdoor and indoor units.
  • Page 283 8. Troubleshooting    Check mode items RAS-(2-2.5)HVNP / RAS-3HVNP Item Indication data Item Check Contents dic. dic. 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 0~115 ( Hz)
  • Page 284 8. Troubleshooting RAS-(3-12)H(V)NP(E) Item Indication data Item Check Contents dic. dic. 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 285 8. Troubleshooting RAS-(4-12)H(V)NC(E) Item Indication data Item Check Contents dic. dic. 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 286 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 heating operation due to high outdoor Demand thermo OFF: air temperature Temperature Area in Heating Operation Demand thermo OFF...
  • Page 287 8. Troubleshooting Cancellation of Forced Thermo OFF ( Turn ON the power source and wait for more than 30 seconds. Then press PSW1 and PSW3 simultaneously 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 288 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 289 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)HVNP / RAS-3HVNC Code...
  • Page 290 8. Troubleshooting RAS-(3-12)H(V)N(P/C)(E) Code Protection control Activating condition Remarks Compression ratio ≥ 7.5 => frequency decrease ε Pressure ratio control ε = (Pd+0.1)/(Ps+0.1) Compression ratio ≤ 1.6 => frequency increase ε High Pressure Switch for Control is activated High-pressure increase protection =>...

  • Page 291: Checking Procedure For Main Parts

    8. Troubleshooting 8.4 Checking procedure for main parts 8.4.1  Procedure for checking the DIP-IPM inverter for indoor and outdoor units    RAS-(3-6)H(V)N(P/C)E 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 minu- DIP-IPM tes. Make sure that no high voltage exists. If LED201 is ON after start-up and LED201 is OFF after turning OFF power source, the voltage will decrease lower than DC50V.
  • Page 292 8. Troubleshooting 1 Touch [+] side of the tester to DIP-IPM 52C terminal, and [-] side to DIP-IPM R, S and T terminals to mea- sure 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 293 8. Troubleshooting • ACT circuit of inverter PCB Internal circuit of ACT part of inverter module Non-faulty if [9] – [13] are checked and satisfied. (Measure with 1 kΩ range of a tester.) External Appearance and Internal Circuit of Transistor Module N O T E DO NOT use a digital tester.
  • Page 294 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.
  • Page 295 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 satis- factory, the transistor module is normal.
  • Page 296 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 297: Checking Capacitors Cb1 & Cb2

    8. Troubleshooting 8.4.2  Checking 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 N O T E It is not recommended to check tension.

  • Page 298: Fault Diagnosis Of Dc Fan Motor

    8. Troubleshooting 8.4.3  Fault diagnosis of 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 C A U T I O N • Turn OFF main power before start working.

  • Page 299: Checking Procedure For The Electronic Expansion Valve For Indoor And Outdoor Units

    8. Troubleshooting 8.4.4  Checking procedure for the electronic expansion valve for indoor and outdoor units Indoor unit electronic expansion valve Outdoor unit electronic expansion valve Locked with fully closed Check the liquid pipe temperature during the hea- It is abnormal if the liquid pipe pressure ting process. It is abnormal if the temperature does not increase during the pump down does not increase.

  • Page 300: Checking Procedure For Other Parts

    8. Troubleshooting 8.4.6  Checking procedure for other parts Part name Model code Resistance (Ω) Unit models 1250 RAS-(3-12)H(V)NP(E) Solenoid Valve Coil SR10D RAS-(4-12)H(V)NC(E) (at 20 1473 VHV-01AP552B1 RAS-(3-12)H(V)NP(E) (at 20 Reversing Valve Coil RAS-(2-2.5)HVNP STF-G01AG579A1 RAS-(3-12)H(V)NC(E) (at 75 1.138 EU1014D9 RAS-2HVNP (at 75 1.138 EU140XA2 RAS-2.5HVNP (at 75...
  • Page 301 8. Troubleshooting    Checking procedure for the compressor CHECK LIST ON COMPRESSOR Client: Model: Date: Serie No. Production Date: Checker: Check item Check method Result Remarks Is THM9 correctly connected? 1. Is wire of thermistor correctly connected by viewing? THM9: Discharge Gas Thermistor 2.
  • Page 302 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 compressor is operating. If Td thermistor is disconnected, the liquid refrigerant return volume will become small by detecting the temperature even if the actual discharge gas temperature is high.

  • Page 303: Spare Parts

    9. Spare parts . S p a r e p a r t s Index 9.1. RAS-(2-2.5)HVNP ..........................290 9.1.1. Cycle and structural parts ........................290 9.1.2. Parts table ............................... 291 9.2. RAS-3HVNC............................292 9.2.1. Cycle and structural parts ........................292 9.2.2.

  • Page 304: Ras-(2-2.5)Hvnp

    9. Spare parts 9.1 RAS-(2-2.5)HVNP 9.1.1  Cycle and structural parts LOCATION OF SPARE PARTS IN THE UNIT MODEL: RAS-2HVNP RAS-2.5HVNP U98A U34B U15C U15A U32B U98E U21B U21A U01A U01B U15B U98B U32A U98D U34A U27B U27A U98C Spare Parts Document: EPN-201212A D-RAS-2HVNP-V, D-RAS-2.5HVNP-V - 4 - SMGB0079 rev.0 - 01/2013...

  • Page 305: Parts Table

    9. Spare parts 9.1.2  Parts table    Cycle and structural parts Part name Remarks U01A Pressure SW High pressure U01B Pressure SW For control Fuse U15A Thermistor U15B Thermistor U15C Thermistor U21A Exp. valve U21B Coil for exp. valve U27A Stop valve Gas line U27B Stop valve...

  • Page 306: Ras-3Hvnc

    9. Spare parts 9.2 RAS-3HVNC 9.2.1  Cycle and structural parts LOCATION OF SPARE PARTS IN THE UNIT MODEL: RAS-3HVNC U98A U34B U15C U15A U32B U98E U21B U21A U01A U01B U15B U98B U32A U98D U34A U27B U27A U98C Spare Parts Document: EPN-201212A D-RAS-3HVNC-V - 5 - SMGB0079 rev.0 - 01/2013...

  • Page 307: Parts Table

    9. Spare parts 9.2.2  Parts table    Cycle and structural parts Part name Remarks U01A Pressure SW High pressure U01B Pressure SW For control Fuse U15A Thermistor U15B Thermistor U15C Thermistor U21A Exp. valve U21B Coil for exp. valve U27A Stop valve Gas line U27B Stop valve...

  • Page 308: Ras-3Hvnpe

    9. Spare parts SUBJECT SERVICE 9.3 RAS-3HVNPE DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 4/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9.3.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT...

  • Page 309: Electrical Parts

    SUBJECT SERVICE 9. Spare parts DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 15/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9.3.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT...

  • Page 310: Parts Name

    9. Spare parts 9.3.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks EXPV Coil Coil for Expansion Valve Rear Cover Assy Assembly Stay Handle End P Unit H Cover Partition S Assy Pipe Cover B Accumulator Upper Cover Assy Assembly Strainer Service Cover S Assy...

  • Page 311: Ras-(4-6)H(V)Npe

    9. Spare parts SUBJECT SERVICE 9.4 RAS-(4-6)H(V)NPE DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 8/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9.4.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT...

  • Page 312: Electrical Parts

    SUBJECT SERVICE DATE: Dec’12 9. Spare parts New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 15/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9.4.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT...
  • Page 313 SUBJECT SERVICE DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 17/21 9. Spare parts Outdoor Units IVX Premium and IVX Standard Series NEWS LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(4/5/6)HNPE ...

  • Page 314: Parts Name

    9. Spare parts 9.4.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks 21-1-1-1 Expansion Valve Rear Cover L Assy Assembly 21-1-1-2 Strainer Handle 21-2 Header G Unit Assembly H Cover EXPV Coil Coil for Expansion Valve Pipe Cover B Stay Upper Cover Assy Assembly...
  • Page 315 9. Spare parts    Electrical parts RAS-(4-6)HVNPE RAS-(4-6)HNPE 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 316: Ras-(4-6)H(V)Nce

    9. Spare parts SUBJECT SERVICE DATE: Dec’12 9.5 RAS-(4-6)H(V)NCE New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 12/21 Outdoor Units IVX Premium and IVX Standard Series NEWS 9.5.1  Cycle and structural parts LOCATION OF SPARE PART IN THE UNIT...
  • Page 317 SUBJECT SERVICE 9. Spare parts DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 13/21 Outdoor Units IVX Premium and IVX Standard Series NEWS LOCATION OF SPARE PART IN THE UNIT CABINET AND CYCLE...

  • Page 318: Electrical Parts

    SUBJECT SERVICE DATE: Dec’12 9. Spare parts 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 9.5.2  Electrical parts LOCATION OF SPARE PART IN THE UNIT...
  • Page 319 SUBJECT SERVICE DATE: Dec’12 New issue of Spare Parts List for HITACHI New DC Inverter UTOPIA PARTS PAGE: 21/21 Outdoor Units IVX Premium and IVX Standard Series 9. Spare parts NEWS LOCATION OF SPARE PART IN THE UNIT ELECTRICAL PARTS RAS-(4/5/6)HNCE ...

  • Page 320: Parts Name

    9. Spare parts 9.5.3  Parts name    Cycle and structural parts Part name Remarks Part name Remarks 21-1-1-2 Strainer Rear Cover Assy Assembly 21-2 Header G Unit Assembly Handle EXPV Coil Coil for Expansion Valve H Cover Stay Pipe Cover B End P Unit Upper Cover Assy Assembly Partition S Assy...
  • Page 321 9. Spare parts    Electrical parts RAS-(4-6)HVNCE RAS-(4-6)HNCE 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 322: Ras-(8-10)Hn(P/C)E

    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-201211B SMGB0079 rev.0 - 01/2013...
  • Page 323 9. Spare parts RAS-(8-10)HNCE Spare Parts Document: EPN-201211B SMGB0079 rev.0 - 01/2013...

  • Page 324: Electrical Parts

    9. Spare parts 9.6.2  Electrical parts Spare Parts Document: EPN-201211B SMGB0079 rev.0 - 01/2013...

  • Page 325: Parts Name

    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 326 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...
  • Page 327 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...

  • Page 328: Ras-12Hn(P/C)

    Spring Lock Washer Hexagon Head Bolt Toothed Lock Washer NOTE: The unicromated coating is applied to iron and steel material for the unspecified materials of the bolt and screw. NOTE: The parts without order number are the custom-ordered, and these are not mentioned in the price list. When ordering them, the part name and the drawing number are required. Contact your HITACHI distributor for the delivery date and price about them. - 3 - Spare Parts Document: SPN-201302 SMGB0079 rev.0 - 01/2013...

  • Page 329: Electrical Parts

    Spring Lock Washer Hexagon Head Bolt Toothed Lock Washer NOTE: The unicromated coating is applied to iron and steel material for the unspecified materials of the bolt and screw. NOTE: The parts without order number are the custom-ordered, and these are not mentioned in the price list. When ordering them, the part name and the drawing number are required. Contact your HITACHI distributor for the delivery date and price about them. - 5 - Spare Parts Document: SPN-201302 SMGB0079 rev.0 - 01/2013...

  • Page 330: Parts Name

    Vibration Absorber Screw Valve Stay Crankcase Heater 240V-40W Thermo Attaching Plate Soundproof Cover Screw Rubber Cap HITACHI Label Heat Exchanger Lower Side Thermistor for Outdoor Temp. Heat Exchanger Upper Side Thermistor for Pipe Temp. Partition Plate Thermistor for Discharge Gas Temp.
  • Page 331 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 333: Servicing

    10. Servicing . S e r v i c i n g Índice 10.1. Introduction............................323 10.2. Servicing for Outdoor Units RAS-(2-2.5)HVNP and RAS-3HVNC ............324 10.2.1. Removing pipe cover ..........................324 10.2.2. Removing front cover ..........................324 10.2.3. Removing outdoor fan ..........................324 10.2.4.
  • Page 334 10. Servicing 10.3.2.7. Removing the compressor ....................350 10.3.2.8. Removing the High pressure switch and Pressure switch for control ........353 10.3.2.9. Opening electrical box (P plate) .................... 354 10.3.2.10. Removing Reversing valve coil ..................... 354 10.3.2.11. Removing electronic expansion valve coil ................355 10.3.2.12.
  • Page 335 10. Servicing 10.4. Servicing for Standard Series......................391 10.4.1. Outdoor Units RAS-(4-6)H(V)NCE ......................391 10.4.1.1. Removing service cover ......................391 10.4.1.2. Remove outlet grille ....................... 391 10.4.1.3. Removing upper cover ......................392 10.4.1.4. Removing bottom service cover and rear cover ..............392 10.4.1.5.
  • Page 336 10. Servicing 10.4.3.7. Removing High pressure switch and pressure switch for control .......... 430 10.4.3.8. Opening electrical box (P-Mounting Plate) ................430 10.4.3.9. Removing reversing and solenoid valves coils ..............431 10.4.3.10. Removing electronic expansion valve coil ................432 10.4.3.11. Removing reversing valve ..................... 433 10.4.3.12.

  • Page 337: Introduction

    10. Servicing 10.1  Introduction D A N G E R • Before performing any of the service operations described in this chapter turn all the main switches off and the place security lockers or convenient warning indicators in order to prevent them from turning on accidentally. • In case of blocked or stucked parts use appropiated tools and eventually lubricants to release them. • In case of sharped edged parts as covers use security gloves to avoid getting injured. • When performing brazing work besides security gloves it is must to wear convenient eye protection. • Check and be sure that the LED201 (Red) on the inverter PCB is OFF for all electrical maintenance. • Do NOT touch the electrical components when the LED201 (Red) on the inverter PCB is ON to avoid electrical shock. N O T E • All compressors are connected by brazing. Check to ensure whether there are flammable things around or not when using a burner for pipe connections if not oil existing pipe inside may ignite. • Do not expose the refrigerant cycle to the atmosphere for a long period in order to avoid mixing the water and foreign particles into the refrigerant cycle. After removing compressor replace it quickly. If exposed for a long period seal the suction pipe and discharge pipe. • Remove the cap for the compressor just before replacing the compressor. Before mounting the compressor seal the suction pipe and discharge pipe with a tape to protect the compressor from foreign particles. Remove the tape at pipe connection. SMGB0079 rev.0 - 01/2013...

  • Page 338: Servicing For Outdoor Units Ras-(2-2.5)Hvnp And Ras-3Hvnc

    10. Servicing 10.2  Servicing for Outdoor Units RAS-(2-2.5)HVNP and RAS-3HVNC 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 339: Removing The Compressor

    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. 1.
  • Page 340 10. Servicing 4  Remove 7 fixing screws and remove the side cover. 1. Electrical box. 2. Heat exchanger. 3. Compressor-top thermistor. 4. Compressor wiring. 5. Terminal cover. 6. Side cover Soundproof cover. 5  Open the soundproof cover wrapped around the compressor and remove the terminal box cover of the compressor body.

  • Page 341: Removing High Pressure Switch And Pressure Switch For Control

    10. Servicing 7  Remove push nuts A and B which fixes the compressor. Lift the compressor and remove from the unit body. (C in the figure does not have a push nut). a.  Check if the Faston terminal has any abnormality when replacing the compressor. (Ensure the pull out force greater than 20 N)If the Faston terminal is identified faulty replace to a new one.

  • Page 342: Removing Four-Way Valve Coil

    10. Servicing 10.2.6  Removing four-way valve coil 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  Remove the electrical box cover. 5  Disconnect the PCN6 connector on the control PCB of the electrical box. 1: PCN6 Connector (Green) 6 ...

  • Page 343: Removing Electrical Components

    10. Servicing 7  Hold and disconnect the coil of the expansion valve.The expansion valve coil is equipped with a lock mechanism.En- sure that the coil is locked when replacing. 1. One terminal cover screw. 2. Side cover. 1. Expansion valve coil. 3.
  • Page 344 10. Servicing 7  Pull up and remove the electrical box. 1. Electrical box cover. 2. Two screws.    Removing Display PCB 1  Remove the pipe cover following Removing pipe cover. 2  Remove 1 fixing screw and remove the terminal cover. 3 ...
  • Page 345 10. Servicing    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. •...

  • Page 346: Servicing For Premium Series

    10. Servicing 10.3  Servicing for Premium series 10.3.1  Outdoor unit RAS-3HVNPE 10.3.1.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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  Pull downward and remove the service cover after removing 3 upper and lower fixing screws. • Pay attention not to drop the service cover. 1.

  • Page 347: Removing Upper Cover

    10. Servicing 10.3.1.3 Removing upper cover 1  Remove the upper cover upward after removing 9 fixing screws. 1. Upper cover. 10.3.1.4 Removing bottom service cover and rear cover 1  Remove 5 screws which fix the bottom service cover. Pull and remove the bottom service cover. 2  Remove the upper cover following Removing upper cover.

  • Page 348: Removing Outdoor Fan Motor

    10. Servicing 10.3.1.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  Remove the upper cover following 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 349: Removing Electrical Box

    10. Servicing 10.3.1.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 4 screws which fix the electrical box. Upper cover Upper Cover 4  Pull up and remove the electrical box. Electrical box Electrical Box Remove 4 screws fixing the...

  • Page 350: Removing The Compressor

    10. Servicing 10.3.1.7 Removing the compressor 1  Remove the service cover upper cover bottom service cover and rear cover following Removing service cover, Remo- ving upper cover, and 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 351 10. Servicing 6  Remove the crankcase heater. 7  Remove the suction pipe and discharge pipe from the compressor. Remove the brazed part after cutting the pipes at “A” by a pipe cutter. 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...
  • Page 352 10. Servicing 10  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 ter- minal is identified faulty replace with a new one. b. ...

  • Page 353: Removing The High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.3.1.8 Removing the High pressure switch and Pressure switch for control 1  Remove the service cover following Removing service cover. 2  Collect the refrigerant from the check joint according to Removing the compressor, in this chapter. High pressure switch and pressure switch for control 1  Remove the soundproof cover on the compressor. 2  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 3 ...

  • Page 354: Opening Electrical Box (P Plate)

    10. Servicing 10.3.1.9 Opening electrical box (P plate) 1  Remove the service cover following Removing service cover in this chapter. 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 90°. •...

  • Page 355: Removing Electronic Expansion Valve Coil

    10. Servicing 10.3.1.11 Removing electronic expansion valve coil 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) and LED1 (Red) are ON to avoid electrical shock.

  • Page 356: Removing Reversing Valve

    10. Servicing 10.3.1.13 Removing reversing valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service cover, Removing bottom service cover and rear cover Removing upper cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil.

  • Page 357: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.3.1.14 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Solenoid Valve Coil.
  • Page 358 10. Servicing    Removing Inverter module 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the Inverter PCB...

  • Page 359: Removing Other Electrical Components

    10. Servicing 10.3.1.16 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 360: Outdoor Units Ras-(4-6)H(V)Npe

    10. Servicing 10.3.2  Outdoor units RAS-(4-6)H(V)NPE 10.3.2.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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 4 fixing screws, slide the service cover downward and remove it. • Pay attention not to fall off the service cover. Service cover Service Cover 10.3.2.2 Removing air outlet grille...

  • Page 361: Removing Upper Cover

    10. Servicing 10.3.2.3 Removing upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. Upper cover 10.3.2.4 Removing the bottom service cover and rear cover 1  Remove 5 screws fixing the lower part of service cover and remove the lower part of service cover by pulling towards front side.

  • Page 362: Removing Outdoor Fan Motor

    10. Servicing 10.3.2.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  Remove the upper cover following 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 363: Removing Electrical Box

    10. Servicing 10.3.2.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 4 screws which fix the electrical box. Upper cover Upper Cover 4  Pull up and remove the electrical box. Electrical box Electrical Box Remove 4 screws fixing the...

  • Page 364: Removing The Compressor

    10. Servicing 10.3.2.7 Removing the compressor 1  Remove the service cover, bottom service cover and rear cover following Removing service cover 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 365 10. Servicing 7  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. 8  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 CLO- SE ATTENTION not to crush to break the pipe.
  • Page 366 10. Servicing 10  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 367: Removing The High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.3.2.8 Removing the High pressure switch and Pressure switch for control 1  Remove the service cover and the bottom service cover following Removing service cover, and Removing bottom service cover and rear cover. 2  Collect the refrigerant from the check joint according to compressor, in this chapter. Removing the High pressure switch and pressure switch for control 1 ...

  • Page 368: Opening Electrical Box (P Plate)

    10. Servicing 10.3.2.9 Opening electrical box (P plate) 1  Remove the service cover following Removing service cover in this chapter. 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 90°. •...

  • Page 369: Removing Electronic Expansion Valve Coil

    10. Servicing 10.3.2.11 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off. 2  Disconnect the CN5A connector on the control PCB of the electrical box.

  • Page 370: Removing Reversing Valve

    10. Servicing 10.3.2.13 Removing reversing valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service cover, Removing bottom service cover and rear cover Removing upper cover. 2  Recover the refrigerant from check joints according to Removing Compressor.

  • Page 371: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.3.2.14 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Solenoid Valve Coil.

  • Page 372: Removing Electrical Components

    10. Servicing 10.3.2.15 Removing electrical components    Removing control PCB (PCB1) 1  Remove the service cover following Removing service cover. 2  Remove all the wiring connected to the control PCB. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED Holder Holder...

  • Page 373: Removing Other Electrical Components

    10. Servicing 10.3.2.16 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 374: Oudoor Units Ras-(8-10)Hnpe

    10. Servicing 10.3.3  Oudoor units RAS-(8-10)HNPE 10.3.3.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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 4 fixing screws, slide the service cover downward and remove it. • Pay attention not to fall off the service cover. Service cover Service Cover 10.3.3.2 Removing air outlet grille...

  • Page 375: Removing Upper Cover

    10. Servicing 10.3.3.3 Removing upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. Upper cover 10.3.3.4 Removing the bottom service cover and rear cover 1  Remove 5 screws fixing the lower part of service cover and remove the lower part of service cover by pulling towards front side.

  • Page 376: Removing Outdoor Fan Motor

    10. Servicing 10.3.3.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  Remove the upper cover following 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 377: Removing Electrical Box

    10. Servicing 10.3.3.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 6 screws which fix the electrical box. Electrical box Upper cover 4  Pull up and remove the electrical box. Remove the fixing screws N O T E...

  • Page 378: Removing The Compressor

    10. Servicing 10.3.3.7 Removing the compressor 1  Remove the service cover and the bottom service cover following Removing service cover, and 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 379 10. Servicing 1. Thermistor holder 2. Holder 3. Td Thermistor 4. Thermistor fixing plate 5. Rubber cap Th Thermistor 6. Indication of terminal number 7. Terminal box cover 8. Compressor 9. Compressor wires 10. Fix it with screw 11. Compressor wires (3 wires) A.
  • Page 380 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 CLO- SE ATTENTION 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 381: Removing High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.3.3.8 Removing High pressure switch and pressure switch for control 1  Remove the service cover following Removing service cover in this chapter. 2  Collect the refrigerant from the check joint according to 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 382: Removing Reversing Valve Coil

    10. Servicing 10.3.3.10 Removing reversing valve coil 1  Remove the service cover following Removing service cover in this chapter. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off. 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. 1.

  • Page 383: Removing Electronic Expansion Valve Coil

    10. Servicing 10.3.3.11 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Disconnect the CN5A connector on the control PCB1 of the electrical box. 3 ...

  • Page 384: Removing Reversing Valve

    10. Servicing 10.3.3.13 Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil. 3 ...

  • Page 385: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.3.3.14 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Solenoid Valve Coil.

  • Page 386: Removing Electrical Components

    10. Servicing 10.3.3.15 Removing electrical components    Removing control PCB (PCB1) and relay PCB (PCB3) 1  Remove the service cover following Removing service cover. 2  Remove all the wiring connected to the control PCB and the Printed Circuit Board (PCB1) relay PCB. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off.
  • Page 387 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. 1: 5 Screws (M5) 2: Fixing screw (M5) Removing Transistor Module (IPM) ...

  • Page 388: Removing Other Electrical Components

    10. Servicing 10.3.3.16 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 389: Outdoor Units Ras-12Hnp

    10. Servicing 10.3.4  Outdoor Units RAS-12HNP 10.3.4.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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 remove it. • Pay attention not to fall off the service cover. Service cover 10.3.4.2 Removing air outlet grille 1 ...

  • Page 390: Removing Upper Cover

    10. Servicing 10.3.4.3 Removing upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. Upper cover 10.3.4.4 Removing the bottom service cover and rear cover 1  Remove 5 screws fixing the lower part of service cover and remove the lower part of service cover by pulling towards front side.

  • Page 391: Removing Outdoor Fan Motor

    10. Servicing 10.3.4.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  If necessary, remove the upper cover following 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 392: Removing Electrical Box

    10. Servicing 10.3.4.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 6 screws which fix the electrical box. 4  Pull up and remove the electrical box. Remove the fixing screws N O T E The following wiring must be removed to dismount the electrical box.

  • Page 393: Removing The Compressor

    10. Servicing 10.3.4.7 Removing the compressor 1  Remove the service cover and the bottom service cover following Removing service cover, and 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 394 10. Servicing 1. Thermistor holder 2. Holder 3. Td Thermistor 4. Thermistor fixing plate 5. Rubber cap Th Thermistor 6. Indication of terminal number 7. Terminal box cover 8. Compressor 9. Compressor wires 10. Fix it with screw 11. Compressor wires (3 wires) A.
  • Page 395 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 CLO- SE ATTENTION 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 396: Removing High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.3.4.8 Removing High pressure switch and pressure switch for control 1  Remove the service cover following Removing service cover in this chapter. 2  Collect the refrigerant from the check joint according to 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 397: Removing Reversing And Solenoid Valves Coils

    10. Servicing 10.3.4.9 Removing reversing and solenoid valves coils 1  Remove the service cover following Removing service cover in this chapter. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off. 2  Remove the connectors on the control PCB (PCB1) of the electrical box according to the following picture. 3 ...

  • Page 398: Removing Electronic Expansion Valve Coil

    10. Servicing 10.3.4.10 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate).

  • Page 399: Removing Reversing Valve

    10. Servicing 10.3.4.11 Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil. 3 ...

  • Page 400: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.3.4.12 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Reversing and Solenoid Valves...
  • Page 401 10. Servicing Removing solenoid valves 1  Remove the brazed parts and the flare connections as Solenoid valve (SVA) shown in the figures. Solenoid Valve (SVA) Brazed Parts: 2 Solenoid Valve (SVC) Brazed Parts: 2 Solenoid Valve (SVF) Flare connections: 2 a.  Remove the solenoid valves with cooling the valve bodies by wet cloth.

  • Page 402: Removing Electrical Components

    10. Servicing 10.3.4.13 Removing electrical components    Removing control PCB (PCB1) 1  Remove the service cover following Removing service cover. 2  Remove all the wiring connected to the control PCB. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED Holder Holder...
  • Page 403 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. 1: 5 Screws (M5) 2: Fixing screw (M5) Removing Transistor Module (IPM) ...

  • Page 404: Removing Other Electrical Components

    10. Servicing 10.3.4.14 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 405: Servicing For Standard Series

    10. Servicing 10.4  Servicing for Standard Series 10.4.1  Outdoor Units RAS-(4-6)H(V)NCE 10.4.1.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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  Pull downward and remove the service cover after removing 3 upper and lower fixing screws. • Pay attention not to drop the service cover. 1.

  • Page 406: Removing Upper Cover

    10. Servicing 10.4.1.3 Removing upper cover 1  Remove the upper cover upward after removing 9 fixing screws. 1. Upper cover. 10.4.1.4 Removing bottom service cover and rear cover 1  Remove 5 screws which fix the bottom service cover. Pull and remove the bottom service cover. 2  Remove the upper cover following Removing upper cover.

  • Page 407: Removing Outdoor Fan Motor

    10. Servicing 10.4.1.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  Remove the upper cover following 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 408: Removing Electrical Box

    10. Servicing 10.4.1.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 4 screws which fix the electrical box. Upper cover Upper Cover 4  Pull up and remove the electrical box. Electrical box Electrical Box Remove four (4) fixing screws...

  • Page 409: Removing The Compressor

    10. Servicing 10.4.1.7 Removing the compressor    RAS-4H(V)NCE 1  Remove the service cover upper cover bottom service cover and rear cover following Removing service cover, Remo- ving upper cover, and 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 410 10. Servicing 6  Remove the crankcase heater. 7  Remove the suction pipe and discharge pipe from the compressor. Remove the brazed part after cutting the pipes at “A” by a pipe cutter. 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...
  • Page 411 10. Servicing Detail of Spring for Cranckase Heater Detail of Spring for Crankcase Heater Compressor Cranckase Heater Crankcase Heater Compressor When attaching the spring, When attatching the spring, pay attentio not to damage pay attention not to damage the cranckase heater. the crankcase heater.
  • Page 412 10. Servicing    RAS-(5-6)H(V)NCE 1  Remove the service cover, upper cover, bottom service cover and rear cover following Removing service cover, Remo- ving upper cover, and 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 413 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 CLO- SE ATTENTION not to crush to break the pipe.
  • Page 414 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 415: Removing The High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.4.1.8 Removing the High pressure switch and Pressure switch for control    RAS-4H(V)NCE 1  Remove the service cover and the bottom service cover following cover, and Removing service Removing bottom service cover and rear cover. 2  Collect the refrigerant from the check joint according to Removing the compressor, in this chapter.

  • Page 416: Opening Electrical Box (P Plate)

    10. Servicing 10.4.1.9 Opening electrical box (P plate) 1  Remove the service cover following Removing service cover in this chapter. 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 90°. •...

  • Page 417: Removing Electronic Expansion Valve Coil

    10. Servicing 10.4.1.11 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service cover, Removing bottom service cover and rear cover Removing upper cover. 2  Disconnect the CN5A connector on the control PCB of the electrical box. 3 ...

  • Page 418: Removing Reversing Valve

    10. Servicing 10.4.1.13 Removing reversing valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service cover, Removing bottom service cover and rear cover Removing upper cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil.

  • Page 419: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.4.1.14 Removing Electronic expansion valve and Solenoid valve 1  Remove the service cover, the bottom service cover, the rear cover and the upper cover following Removing service cover, Removing bottom service cover and rear cover Removing upper cover. 2  Recover the refrigerant from check joints according to Removing Compressor.
  • Page 420 10. Servicing    Removing Inverter module 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the Inverter PCB...

  • Page 421: Removing Other Electrical Components

    10. Servicing 10.4.1.16 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 422: Outdoor Units Ras-(8-10)Hnce

    10. Servicing 10.4.2  Outdoor Units RAS-(8-10)HNCE 10.4.2.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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 4 fixing screws, slide the service cover downward and remove it. • Pay attention not to fall off the service cover. Service cover Service Cover 10.4.2.2 Removing air outlet grille...

  • Page 423: Removing Upper Cover

    10. Servicing 10.4.2.3 Removing upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. Upper cover 10.4.2.4 Removing the bottom service cover and rear cover 1  Remove 5 screws fixing the lower part of service cover and remove the lower part of service cover by pulling towards front side.

  • Page 424: Removing Outdoor Fan Motor

    10. Servicing 10.4.2.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  Remove the upper cover following 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 425: Removing Electrical Box

    10. Servicing 10.4.2.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 6 screws which fix the electrical box. Electrical box Upper cover 4  Pull up and remove the electrical box. Remove the fixing screws N O T E...

  • Page 426: Removing The Compressor

    10. Servicing 10.4.2.7 Removing the compressor 1  Remove the service cover and the bottom service cover following Removing service cover, and 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 427 10. Servicing 1. Thermistor holder 2. Holder 3. Td Thermistor 4. Thermistor fixing plate 5. Rubber cap Th Thermistor 6. Indication of terminal number 7. Terminal box cover 8. Compressor 9. Compressor wires 10. Fix it with screw 11. Compressor wires (3 wires) A.
  • Page 428 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 CLO- SE ATTENTION 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 429: Removing High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.4.2.8 Removing High pressure switch and pressure switch for control 1  Remove the service cover following Removing service cover in this chapter. 2  Collect the refrigerant from the check joint according to Removing the compressor, in this chapter. 3  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 4 ...

  • Page 430: Removing Reversing Valve Coil

    10. Servicing 10.4.2.10 Removing reversing valve coil 1  Remove the service cover following Removing service cover in this chapter. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off. 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. 1.

  • Page 431: Removing Electronic Expansion Valve Coil

    10. Servicing 10.4.2.11 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Disconnect the CN5A connector on the control PCB1 of the electrical box. 3 ...

  • Page 432: Removing Reversing Valve

    10. Servicing 10.4.2.13 Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil. 3 ...

  • Page 433: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.4.2.14 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Solenoid Valve Coil.

  • Page 434: Removing Electrical Components

    10. Servicing 10.4.2.15 Removing electrical components    Removing control PCB (PCB1) and relay PCB (PCB3) 1  Remove the service cover following Removing service cover. 2  Remove all the wiring connected to the control PCB and the Printed Circuit Board (PCB1) relay PCB. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off.
  • Page 435 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. 1: 5 Screws (M5) 2: Fixing screw (M5) Removing Transistor Module (IPM) ...

  • Page 436: Removing Other Electrical Components

    10. Servicing 10.4.2.16 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 437: Outdoor Units Ras-12Hnc

    10. Servicing 10.4.3  Outdoor Units RAS-12HNC 10.4.3.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedu- re 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 remove it. • Pay attention not to fall off the service cover. Service cover 10.4.3.2 Removing air outlet grille 1 ...

  • Page 438: Removing Upper Cover

    10. Servicing 10.4.3.3 Removing upper cover 1  Remove 11 screws fixing the upper cover and remove the upper cover upward. Upper cover 10.4.3.4 Removing the bottom service cover and rear cover 1  Remove 5 screws fixing the lower part of service cover and remove the lower part of service cover by pulling towards front side.

  • Page 439: Removing Outdoor Fan Motor

    10. Servicing 10.4.3.5 Removing outdoor fan motor 1  Remove the service cover following Removing service cover. 2  Remove the outlet grille following Remove outlet grille. 3  If necessary, remove the upper cover following 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 440: Removing Electrical Box

    10. Servicing 10.4.3.6 Removing electrical box 1  Remove the service cover following Removing service cover. 2  Remove the upper cover following Removing upper cover. 3  Remove 6 screws which fix the electrical box. 4  Pull up and remove the electrical box. Remove the fixing screws N O T E The following wiring must be removed to dismount the electrical box.
  • Page 441 10. Servicing    Removing the compressor 1  Remove the service cover and the bottom service cover following Removing service cover, and 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 442 10. Servicing 1. Thermistor holder 2. Holder 3. Td Thermistor 4. Thermistor fixing plate 5. Rubber cap Th Thermistor 6. Indication of terminal number 7. Terminal box cover 8. Compressor 9. Compressor wires 10. Fix it with screw 11. Compressor wires (3 wires) A.
  • Page 443 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 CLO- SE ATTENTION 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 444: Removing High Pressure Switch And Pressure Switch For Control

    10. Servicing 10.4.3.7 Removing High pressure switch and pressure switch for control 1  Remove the service cover following Removing service cover in this chapter. 2  Collect the refrigerant from the check joint according to Removing the compressor, in this chapter. 3  Disconnect the Faston Terminals of High Pressure Switch and Pressure sensor for PD control. 4 ...

  • Page 445: Removing Reversing And Solenoid Valves Coils

    10. Servicing 10.4.3.9 Removing reversing and solenoid valves coils 1  Remove the service cover following Removing service cover in this chapter. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED turns off. 2  Remove the connectors on the control PCB (PCB1) of the electrical box according to the following picture. 3 ...

  • Page 446: Removing Electronic Expansion Valve Coil

    10. Servicing 10.4.3.10 Removing electronic expansion valve coil 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate).

  • Page 447: Removing Reversing Valve

    10. Servicing 10.4.3.11 Removing reversing valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Remove the reversing valve coil according to Removing Reversing Valve Coil. 3 ...

  • Page 448: Removing Electronic Expansion Valve And Solenoid Valve

    10. Servicing 10.4.3.12 Removing Electronic expansion Valve and Solenoid Valve 1  Remove the service cover, the bottom service cover and the rear cover following Removing service cover Remo- ving bottom service cover and rear cover. 2  Recover the refrigerant from check joints according to Removing Compressor. 3  Remove the coils according to Removing Electronic Expansion Valve Coil Removing Reversing and Solenoid Valves...

  • Page 449: Removing Electrical Components

    10. Servicing 10.4.3.13 Removing electrical components    Removing control PCB (PCB1) 1  Remove the service cover following Removing service cover. 2  Remove all the wiring connected to the control PCB. D A N G E R DO NOT touch electrical components while the LED1 (Red) is ON to avoid electrical shock. Wait until the LED Holder Holder...
  • Page 450 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. 1: 5 Screws (M5) 2: Fixing screw (M5) Removing Transistor Module (IPM) ...

  • Page 451: Removing Other Electrical Components

    10. Servicing 10.4.3.14 Removing other electrical components 1  Remove the service cover following Removing service cover in this chapter. 2  Open the P plate turning counter clockwise approximately 90° following Opening electrical box (P plate). • Check that the LED201 (red) on Inverter is OFF when the P plate is opened. D A N G E R DO NOT touch electrical components while the LED201 (Red) is ON to avoid electrical shock. Wait until the LED turns off.

  • Page 453: Electrial Checks Of Main Parts

    11. Electrial checks of main parts . E l e c t r i a l c h e c k s o f m a i n p a r t s Index 11.1. Inverter ..............................440 11.1.1. Specifications of inverter ......................... 440 11.1.2.

  • Page 454: Inverter

    11. Electrial checks of main parts 11.1 Inverter 11.1.1  Specifications of inverter RAS-(8-12) RAS-(2-2.5)HVNP Applicable model RAS-(4-6)HNPE RAS-(4-6)HNCE RAS-3HVNPE RAS-(4-6)HVNPE RAS-(4-6)HVNCE HN(P/C)(E) RAS-3HVNC Applicable power source 3 Phase 400V 50 Hz 1 Phase. 230V 50 Hz Output current 24.0A 16.0A 45.0A 10.5A 16.0A 24.0A 16.0A...
  • Page 455 11. Electrial checks of main parts Protection function RAS-(8-12) RAS-(2-2.5)HVNP Applicable model RAS-(4-6)HNPE RAS-(4-6)HNCE RAS-3HVNPE RAS-(4-6)HVNPE RAS-(4-6)HVNCE HN(P/C)(E) RAS-3HVNC Excessive low voltage at a voltage is lower than 350 V DC Excessive low voltage at a voltage is lower than 194 V DC Excessive high or low voltage for inverter Excessive high voltage at a voltage is higher...

  • Page 456: Inverter Time Chart

    11. Electrial checks of main parts 11.1.2  Inverter time chart Frequency Main Circuit Power Source Frequency All bit 1 Operation All bit 1 HIGH Frequency Instruction Output Voltage Soft Start-Stop (Frequency) The changing speed depends on command from PCB. Failure Signal Output Activation of Protection Transmitting...

  • Page 457: Protective Function

    11. Electrial 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) V abnormalities are detected. • When the voltage of direct current is smaller than (B) V abnormalities are detected. Power supply 400V 50Hz 230V 50Hz...

  • Page 458: Overload Control

    11. Electrial 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 459: Thermistor

    11. Electrial 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 DANGER HIGH VOLTAGE DSW5 SEG1 LED3 R111 CP20 DCL2 LED2 R117 DSW1 R118 RSW1 DSW2...
  • Page 460 11. Electrial checks of main parts 4 If compressor upper part temperature increases excessively the protection control is activated and the compressor is stopped according to the following method. Operation Upper part temperature of compressor Defecting period Over 132 ºC 10 minutes (continuously) Cooling Over 140 ºC...

  • Page 461: Electronic Expansion Valve

    11. Electrial 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...

  • Page 462: High Pressure Protection Device

    11. Electrial 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: In case that the discharge pressure is higher than 4.15 MPa (R410A) the protection control is activated and the compressor is stopped.
  • Page 463 11. Electrial checks of main parts RAS-4H(V)NCE RAS-(5-6)H(V)NCE Electrical Box Upper cover Discharge pipe Upper cover Brazing Electrical Box part High pressure switch Pressure sensor for PD control RAS-(8-10)HNPE RAS-(8-10)HNCE Pressure sen- High pressure switch sor for control Pressure sen- High pressure Brazing part Brazing part...

  • Page 464: Noise Filter (Nf)

    11. Electrial 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 465: Noise Filter For 1~ (230V/50Hz)

    11. Electrial 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 466: Capacitor (Cb1 Cb2)

    11. Electrial checks of main parts 11.6 Capacitor (CB1 CB2) 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 LNX2G472MSEAHE Capacity of static electricity 4700 μF Rated voltage 400 VDC...

  • Page 467: Reactor (Dcl)

    11. Electrial 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 468: Scroll Compressor

    11. Electrial 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 °C to 110 °C. 11.8.2 ...

  • Page 469: Maintenance Notes

    12. Maintenance notes . M a i n t e n a n c e n o t e s Index 12.1. General notes ............................456 12.1.1. Checking the power source and the wiring connection ................456 12.1.2. Burnt-out compressor due to an insufficient refrigerant charge ............... 456 12.1.3.
  • Page 470 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 of the fuse cut Check the secondary voltage of the breaker and the fuse by means of a tester. out? Disconnect the secondary side of the transformer and check the voltage by means of a tester.

  • Page 471: Insufficient Cooling Performance When A Long Piping Is Applied

    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 DSW3 is required.

  • Page 472: Not Cooling Well Due To Insufficient Installation Space For The Outdoor Unit

    12. Maintenance notes 12.1.5  Alarm code “31” Question and answer for the field work Example 4: Alarm code “31” Phenomenon Alarm code “31” sometimes occurred and the system stopped. The combination of the indoor units and the outdoor unit was the following. Power Source Cause...

  • Page 473: Maintenance Work

    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 474: Service And Maintenance Record

    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. —...

  • Page 475: Service And Maintenance Record Using The 7-Segment Display

    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.
  • Page 476 12. Maintenance notes Customer’s name:________________________________ Date:____________________ RAS- RAS- Outdoor unit model (serial No. ) (Serial No. ) (Serial No. ) 8.2 Liquid pipe temp. of I.U. (Free- ze protection) 8.3 I.U. intake air temp. 8.4 I.U. discharge air temp. 8.5 Cause of I.U. stoppage N O T E • O.U.: Outdoor Unit.

  • Page 477: Service And Maintenance Record By Remote Control Switch

    12. Maintenance notes 12.5 Service and maintenance record by remote control switch Data sheet for checking by remote control switch Time I.U. modelo I.U. serial No. I.U. No. / alarm code Check Check 1·2 1·2 1·2 1·2 1·2 mode 1 mode 2 B Temp.

  • Page 478: Pump-Down Method For Replacing The Compressor

    12. Maintenance notes 12.6 Pump-down method for replacing the compressor Procedure Remarks Turn off the main switch of the outdoor unit. Remove the covers the thermistor the crankcase heater the power Make sure that the terminal part of the detached power supply wirings and other items according to the chapter 10.
  • Page 480 Hitachi Air Conditioning Products Europe, S.A. 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. is certified with:...

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