Hitachi RAS-H(V)RNME-AF Service Manual
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Hitachi RAS-H(V)RNME-AF Service Manual

Yutaki s series
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Table of Contents

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YUTAKI S SERIES

Service Manual

RWM-FSN3E Indoor units
RAS-H(V)RNME-AF Outdoor units
RAS-HVRN2 Outdoor unit

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Summary of Contents for Hitachi RAS-H(V)RNME-AF

  • Page 1: Service Manual

    YUTAKI S SERIES Service Manual RWM-FSN3E Indoor units RAS-H(V)RNME-AF Outdoor units RAS-HVRN2 Outdoor unit...
  • Page 3 Contents C o n t e n t s General Information Unit installation Piping work and refrigerant charge Electrical wiring Control system User interface Optional functions Commissioning Electrical checks of the main parts Spare parts Servicing Troubleshooting SMGB0070 rev. 1 - 08/2011...

  • Page 5: Table Of Contents

    Index Index Contents ..........................3 1. General information ....................... 1 1.1 General information ............................ 2 1.1.1 General notes ..............................2 1.1.2 Introduction ..............................2 1.1.3 Environtment-friendly units ..........................3 1.2 Applied symbols ............................4 1.3 Product guide.............................. 5 1.3.1  Classification of indoor unit models ......................... 5 1.3.2 ...
  • Page 6 Index 3. Piping work and refrigerant charge ................55 3.1  Refrigerant and water pipe work ....................... 56 3.1.1  General notes before performing pipe work ....................56 3.1.2 Suspension of refrigerant and water pipes ....................56 3.1.3  Pipe work and connection ..........................57 3.2  Water pipe work and connection ......................67 3.2.1 General notes ..............................67 3.2.2 Water piping connection ..........................68 3.2.3 ...
  • Page 7 Index 5.2.1 Indoor unit ..............................115 5.2.2 Outdoor unit ..............................116 5.3 Safety protection and control device....................... 118 5.3.1 Indoor unit ..............................118 5.3.2 Outdoor unit ..............................118 5.4 Standard control functions ........................119 5.4.1 Indoor Unit ..............................119 6. LCD user’s interface....................179 6.1 Description of the hardware ........................180 6.1.1 ...
  • Page 8 Index 7.2.2  Configuration ..............................211 7.2.3 Description of optional output signals ......................213 8. Commissioning ......................215 8.1  Preliminary check ........................... 216 8.1.1  Checking the unit ............................216 8.1.2  Electrical checking ............................216 8.1.3  Hydraulic circuit checking ..........................216 8.1.4  Checking the Refrigerant circuit ........................217 8.2 Commissioning procedure ........................217 8.3 Indoor unit test run ..........................
  • Page 9 Index 10. Spare parts ........................ 237 10.1 Outdoor units ............................238 10.1.1 RAS-2HVRN2 ............................238 10.1.2 RAS-3HVRNME-AF ..........................240 10.1.3 RAS-(4-6)HVRNME-AF ..........................243 10.1.4 RAS-(4-6)HRNME-AF ..........................246 10.1.5 RAS-(8/10)HRNME-AF ..........................249 10.2 Indoor units ............................252 11. Servicing........................257 11.1 Outdoor unit ............................258 11.1.1 RAS-2HVRN2 ............................

  • Page 11: 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. Environtment-friendly units .......................... 3 1.2.

  • Page 12: General Information

    1 General information 1.1 General information 1.1.1 General notes No part of this publication may be reproduced, copied, filed or transmitted in any shape or form without the permission of  HITACHI Air Conditioning Products Europe, S.A. Within the policy of continuous improvement of its products, HITACHI Air Conditioning Products Europe, S.A. reserves the right to make changes at any time without prior notification and without being compelled to introducing them into products  subsequently sold. This document may therefore have been subject to amendments during the life of the product. HITACHI makes every effort to offer correct, up-to-date documentation. Despite this, printing errors cannot be controlled by  HITACHI and are not its responsibility.

  • Page 13: Contents

     Domestic Hot Water (DHW) production YUTAKI S also gives the option of sanitary hot water production, allowing the user to benefit from the heat pump’s high  efficiency and achieve hot water up to 70ºC. This is made possible by a Domestic Hot Water Tank accessory supplied by  HITACHI, which is heated in the heat pump at temperatures below 60ºC, using water pre-heated. An electric heater inte- grated at the top of the stainless steel tank, increases the temperature in accordance with the user’s needs.  Additional combinations YUTAKI S system can be used for the following additional combinations: Solar combination for DHW YUTAKI S system can be combined with solar panel.

  • Page 14: Applied Symbols

    1 General information 1.2 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. To indicate these situations, a series of special symbols will be used to clearly identify these situations. Pay close attention to these symbols and to the messages following them, as your safety and that of others depends on it.

  • Page 15: Product Guide

    Compressor power (HP): 2. Heat pump V: Single phase unit (1~ 230V 50Hz) -: Three phase unit (3N~ 400V 50Hz) Inverter system R410A refrigerant Series -: Made in Japan  RAS-H(V)RNME-AF Unit type (outdoor unit) Position-separating hyphen (fixed) Compressor power (HP): 3, 4, 5, 6, 8, 10. Heat pump V: Single phase unit (1~ 230V 50Hz) -: Three phase unit (3N~ 400V 50Hz) Inverter system R410A refrigerant...

  • Page 16: Classification Of Domestic Hot Water Tank Accessory

    1 General information 1.3.3 Classification of Domestic Hot Water Tank accessory Unit type: Domestic Hot Water Tank Capacity (L) 200-300 Litres Tank type: E=Enamelled S=Stainless Position-separating hyphen (fixed) 2.5 kW Electrical Heater Series E = Made in Europe DHWT 1.3.4 Product guide: indoor unit RWM-FSN3E indoor units  1~  3N~ Unit Code Unit Code RWM-2.0FSN3E...

  • Page 17: Product Guide: Outdoor Unit

    1 General information 1.3.5 Product guide: outdoor unit RAS-H(V)RNME-AF outdoor units RAS-HVRNME-AF units RAS-HRNME-AF units Unit Code Unit Code RAS-2HVRN2 60288093 RAS-3HVRNME-AF 7E300018 RAS-4HVRNME-AF 7E300020 RAS-4HRNME-AF 7E300120 RAS-5HVRNME-AF 7E300021 RAS-5HRNME-AF 7E300121 RAS-6HVRNME-AF 7E300022 RAS-6HRNME-AF 7E300122 RAS-8HRNME-AF 7E317110 RAS-10HRNME-AF 7E317111 1.3.6 Accessory code list ...

  • Page 18: Smgb0070 Rev. 1

    1 General information  Other accessories Accessory Name Code Figure ATW-HSK-01 7E549905 Hydraulic separator (BDHM1) (BDHM1) ATW-3WV-01 7E549906 3-way valve (VID3V1) (VID3V1) ATW-AQT-01 7E549907 Aquastat (ASMSH1) (ASMSH1) ATW-2KT-01 7E549904 2nd temperature kit (CDH2Z1) (CDH2Z1) Mixing valve motor 7E549912 ATW-MVM-01 Drain pan kit  ATW-DPK-01 7E549902 (For RWM-(2.0-6.0)FSN3E) Drain pan kit 7E549903...
  • Page 19 1 General information Accessory Name Code Figure Water temperature sensor ATW-WTS-02Y 9E500004 (for Domestic Hot Water Tank) DHWT200E-2.5H1E Domestic Hot Water Tank Enamelled (200 L.) 70544000 DHWT300E-2.5H1E Domestic Hot Water Tank Enamelled (300 L.) 70544001 DHWT200S-2.5H1E Domestic Hot Water Tank Stainless (200 L.) 70544100 DHWT300S-2.5H1E Domestic Hot Water Tank Stainless (300 L.) 70544101 Permanent cathode protection for enamelled tank  DHWT-CP-01 70544900 (200 L.) Permanent cathode protection for enamelled tank  DHWT-CP-03 70544903 (300 L.) Permanent cathode protection for stainless tank  DHWT-CP-02 70544901 (200 L.) Permanent cathode protection for stainless tank ...

  • Page 21: Unit Installation

    2 Unit installation U n i t i n s t a l l a t i o n Index 2.1. Outdoor unit installation......................... 10 2.1.1. Initial check ..............................10 2.1.2. Transportation of outdoor unit........................11 2.1.3. Center of gravity ............................12 2.1.4.

  • Page 22: Outdoor Unit Installation

    2 Unit installation 2.1 Outdoor unit installation 2.1.1 Initial check C A U T I O N • 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, for 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.

  • Page 23: Transportation Of Outdoor Unit

    2 Unit installation 2.1.2 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.  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 in the figure. RAS-(4-10)H(V)RNME-AF RAS-2HVRN2 RAS-3HVRNME-AF Over 60º Wire rope Over 60º Wire rope 0.7 to 1.0 m 0.7 to 1.0 m Do not remove the plastic band Do not remove the plastic band or the corrugate paper frame...

  • Page 24: Center Of Gravity

    2 Unit installation 2.1.3 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. a. 515 mm RAS-2HVRN2 b. 180 mm h. 275 mm a. 590 mm RAS-3HVRNME-AF b. 185 mm h. 370 mm a. 615 mm RAS-(4-6)H(V)RNME-AF b. 190 mm h.

  • Page 25: Factory-Supplied Accessories For Ras-(8-10)Hrnme-Af

    2 Unit installation 2.1.4 Factory-supplied accessories for RAS-(8-10)HRNME-AF 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 Appearance Quantity Gasket Pipe flange for refrigerant gas piping Ring core Cable tie Compressed sheet SMGB0070 rev. 1 - 08/2011...

  • Page 26: Installation Space

    2 Unit installation 2.1.5 Installation space RAS-2HVRN2 Blocked in Inlet Side Upper Side Open Single Installation Multiple Installation (Two units or more) Pipe Cover Pipe Cover Ensure 250 mm or more of the side space on the pipe cover Allow 250 mm of space between units. Leave open both right and side.
  • Page 27 2 Unit installation Blocked in Inlet Side The length A is as show in the following table: 0<L=1/2H 500 or greater 1/2H<L≤H 1000 or greater When L > H use a base for outdoor unit to make L ≤ H. Close the base not to allow the outlet air bypassed. Outlet Side Blocked Upper Side Open Single Installation Multiple Installation (Two units or more) Pipe Cover...
  • Page 28 2 Unit installation Lateral Side Blocked Upper Side Open Single Installation Pipe Cover Pipe Cover Ensure 250 mm or more of the side space on the pipe cover Ensure 250 mm or more of the side space on the pipe cover side. side.
  • Page 29 2 Unit installation Single Installation Multiple Installation Blocked in Inlet Side Pipe Cover Pipe Cover Allow 250 mm of service space between units. Serial sideways installation allowed up to two units. Close the part A not to allow the outlet air bypassed. Install to Leave open both right and left sides.
  • Page 30 2 Unit installation RAS-(3-6)H(V)RNME-AF Blocked in Inlet Side Upper Side Open Single Installation Multiple Installation (Two units or more) 100 mm or more of the side space is acceptable on the service cover Allow 100 mm of space between units. Leave open both right and left side.
  • Page 31 2 Unit installation Blocked in Inlet Side The length A is as shown in the following table: 0 < L ≤ 1/2H 600 or greater 1/2H < L≤ H 1200 or greater Be sure to use the fan direction guide. Allow 100 mm of space between units. Leave open both right and left sides. Serial installation allowed up to two units.
  • Page 32 2 Unit installation Lateral Side Blocked Upper Side Open Single Installation Upper Side Blocked Stack installation (allowed up to 2 Units) Upper Side Open Single Installation Multiple Installation Allow 100 mm of space between units. Serial sideways installa- Close the part A not to allow the outlet air bypassed. Install to tion allowed up to two units.
  • Page 33 2 Unit installation Multiple Installation in Multiple Rows Serial Installation in Multiple Rows (E.g. Rooftop) Allow approx. 100 mm of space from the side unit. Leave open both right and left sides. The length A is as shown in the following table: 0 < L ≤ 1/2H ≤ 200 1/2H < L≤ H...
  • Page 34 2 Unit installation RAS-(8-10)HRNME-AF Single installation Single installation Single installation Single installation Single installation Single installation Single installation Single installation Single installation Single installation Single installation Single installation Around side are open Around sides are open with obstacles above Around sides are open Around sides are open with obstacles above Around sides are open Around sides are open...
  • Page 35 2 Unit installation Stack installation (allowed up to 2 Units) Single Installation Multiple Installation Allow 100 mm of space between units. Serial sideways installa- tion allowed up to two units. Leave open both right and left sides. Close the part A not to allow the outlet air bypassed. Install to Close the part A not to allow the outlet air bypassed.

  • Page 36: Installation Place Provision

    2 Unit installation 2.1.8 Installation place provision  Concrete foundation 1 When installing the outdoor unit, fix the unit by anchor bolts. Base of Air flow direction outdoor unit Special washer (Accessory) * M10 (RAS-2HVRN2, RAS-(3-6)H(V)RNME-AF) M12 (RAS-(8/10)HRNME-AF) Anchor bolt M12 * ** < 17 mm (RAS-2HVRN2) Filled mortar < 21 mm (RAS-(3-10)H(V)RNME-AF) Fix the outdoor unit to the anchor bolts by special washer.
  • Page 37 2 Unit installation 3 During the heating or defrosting operations, drain water is discharged from the unit. When installing the unit, the location with good drainage should be selected, or establish the drainage. It is recommended not to install the unit at high place such as on a roof or a veranda, because the water may drip from the unit.
  • Page 38 2 Unit installation  Suspended unit 1 Suspend the unit as the drawing indicates. Wall bracket (*) 2 Ensure that wall can resist the Outdoor unit weight indi- cated in specification label plate. 3 It is recommended to select each foot support to bear the full weight of the unit (in order to consider stress Anchor Bolts (*) fatigue applied when unit is working too).

  • Page 39: Optional Parts And Installation

    2 Unit installation 2.1.9 Optional parts and installation  RAS-2HVRN2 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 40 2 Unit installation Locations of fixing holes The holes Location shall be made by using self-screws (M4x13) and  later  shall  be  used  SUS  screw  (M5x12)  for  fixing  air  flow  guide. 1 Outdoor Unit 2 Hole (4 locations) One flow guide installation 1 Air discharge grille 2 Air flow 3 Outdoor unit...

  • Page 41: Specifications

    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” “Air flow guide” or “Snow protection ...
  • Page 42 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 43 2 Unit installation Attaching example of snow protection hood 1. Fixing screw (accessories) 2. Air inlet hood 3. Wire rope (optional for over turning protection) 4. Air discharge hood 5. Outdoor unit A. Rear side B. Left side C Front side N O T E The holes locations marked with a mark shall be made by using sel screw (M4X13) and later shall be used SUS Screw for fixing protection hood.
  • Page 44 2 Unit installation  RAS-3HVRNME-AF Air flow guide, wind guard and snow protection hood Air flow guide Wind Guard Optional parts Model Air flow guide AG-335A Wind guard WSP-335A Air outlet ASG-NP335F Zinc plate Air inlet of rear side ASG-NP80B Air inlet of side face ASG-NP80L Snow protection Snow protection hood...
  • Page 45 2 Unit installation One flow guide installation Service space (In case of upward air discharge) Š In case of right and left sides air discharge, M5 fixing screw x4 enough space for air discharge is required. (Accessories) Š The downward air discharge is also available. In Outdoor unit such case, install the base under the unit to secu- Air discharge...
  • Page 46 2 Unit installation One windguard cover installation Service space Š Both sides of the outdoor unit should be open. M5 fixing screw x4 Air discharge grille (Accessories) Š No obstacles should be placed in the air dischar- ge side. Outdoor unit Wind guard Air discharge grille Outdoor unit Wind guard...
  • Page 47 2 Unit installation Left suction hood Part name Qty. Fixing hole x 2 Right side plate    Left side plate Enlarged view of A   (Fixing Hole) Fixing screw (Accessories) Front panel (Upside)   Front panel (Downside) ...
  • Page 48 2 Unit installation Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood Model ASG-NP335F ASG-NP335FS2 ASG-NP80B ASG-NP160BS2 ASG-NP80L ASG-NP160LS2 Quantity 2 per unit 1 per unit Bonderized Bonderized Bonderized Stainless Stainless Stainless steel sheet Material steel sheet steel sheet (NSSC 180) (NSSC 180)
  • Page 49 2 Unit installation •  Air flow guide Specifications Model AG-335A View from A Quantity 2 per unit Mounting dimension Air discharge direction Upward (downward), left & right Weather proof polypropylene Material resin Color Gray Weight 1.9 kg Fixing screw x 4 [M5 (SUS) x 20] Accessories Air flow guide Installation manual...
  • Page 50 2 Unit installation •  Wind guard Specifications Model WSP-335A Quantity 2 per unit Galvanized sheet metal + baked  Material painting Color Gray (1.oY8.5/0.5) (Mounting dimension) Weight 5.5 kg Air flow Fixing screw x 4 [M5 (SUS) x 12] Accessories Installation manual Air flow Air flow “Guard net”, “Air flow guide” or  Installation restriction “Snow protection hood”...
  • Page 51 2 Unit installation •  Snow protection hood Air discharge hood Part name Qty.  Right side plate   Left side plate  Front panel  Fixing screw (Accessories) Hole for safety wire rope to prevent overturning Stay   ...
  • Page 52 2 Unit installation Attaching example of snow protection hood Left suction hood Fixing screw (Accessories) Fixing screw Air discharge (Accessories) hood Rear suction hood Upper side Air discharge Fixing screw grille (Accessories) Wire rope Air discharge Front side hood (Optional. For over- turning protection) Air discharge grille Rear suction hood...
  • Page 53 2 Unit installation  RAS-(8/10)HRNME-AF 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 54 •  Two flow guides installation 1 Air discharge grille 2 Air flow 3 Air flow guide (see the note) 4 Outdoor Unit 5 M5 fixing screw x4 (Accessories) N O T E Air flow direction of both air flow guides should be the same. •  Service space (In case of upward air discharge) In case of right and left sides air discharge enough space for air discharge is required.
  • Page 55 2 Unit installation C A U T I O N If the air guide is installed without discharge grille it may cause injury due to rotating fan. •  Two windguard covers installation 1 Air discharge grille 2 Wind guard 3 Outdoor unit 4 M5 fixing screw x4 (Accessories) •  Service space Both sides of the outdoor unit should be open. No obstacles should be placed in the air discharge side.
  • Page 56 2 Unit installation •  Left suction hood Nº Part name Quantity Right side plate Left side plate Front panel (upside) Front side (downside) Fixing hole x 2 Fixing screw (Accessories) Ø15 •  Attaching example of snow protection hood 1100 1. Left suction hood A.
  • Page 57 2 Unit installation •  Specifications of snow protection hood Product name Air discharge hood Rear suction hood Left suction hood Model ASG-NP335F ASG-NP335FS2 ASG-NP335B ASG-NP335BS2 ASG-NP335L ASG-NP335LS2 Quantity 2 per unit 1 per unit Bonderized Bonderized Bonderized Stainless Stainless Stainless steel sheet steel sheet steel sheet Material (NSSC180)

  • Page 58: Indoor Unit Installation

    2 Unit installation 2.2 Indoor unit installation 2.2.1 Selection of the installation location The indoor unit of the split-type air to water must be installed following these basic requirements: •  Install the unit in a no-frost enviroment. •  The unit is prepared to be wall mounted (wall bracket is factory supplied), so make sure that selected wall is flat and is  made of a non-combustible surface, strong enough for supporting the indoor unit weight. • ...

  • Page 59: Wall Mounting Procedure

    2 Unit installation 2.2.2 Wall mounting procedure •  Step : Fix the wall support to the wall using appropriate plugs and screws. Make sure that the wall support is com- pletely levelled. •  Step : Hang the indoor unit on the wall support (two persons are required in order to lift the unit. The unit’s weight is approximately 60 kg (RWM-(2.0-6.0)FSN3E) and 85 kg (RWM-(8.0/10.0)FSN3E)) •  Step : Fix the indoor unit at the bottom side using appropriate plugs and screws. To do so, the unit is equipped with two holes at the bottom outer edges of the back plate frame (there are two additional holes on the upper outer edges ...

  • Page 60: Cover Assembly

    2 Unit installation 2.2.3 Cover assembly N O T E This operation should be performed upon completion of the unit’s pipe work. •  Step : Place the Unit’s Cover at same level of the wall mounted unit by taking it from the bottom side (one person can  perform this operation, during this operation it is possible to rest the Cover on the Electrical Box). •  Step : Place the Right side Cover Holes over the Back Plate Hooks (x2 locations) with the help of the external marks  indicated by “>”). •  Step : When the Right side is centred, repeat the operation on the Left side. Put the Left side Cover Holes into the Back Plate frame Hooks (x2 locations) with the help of the external marks indicated by “>”).

  • Page 61: Drain Pan Assembly

    2 Unit installation 2.2.4 Drain pan assembly N O T E If there is a cooling installation a drain pan must be installed. Hitachi’s drain pan accessory is supplied by re- quest: Name Code For models ATW-DPK-01 7E549902 RWM-(2.0-6.0)FSN3E ATW-DPK-02 7E549903 RWM-(8.0/10.0)FSN3E Drain pipe assembly is recommended only after completion of the pipe work, following assembly instructions included with the accessory. Make sure to avoid dew outside the drain pan when installing it on the pipes, and maintain level in order to pre- vent drain pan overflow. 2.2.5 Service space •  Install  the  indoor  unit  with  sufficient  clearance  around  it  to  provide  good  conditions  for  electrical  cables,  Water  and ...

  • Page 62: Dhwt - Domestic Hot Water Tank

    2 Unit installation 2.3 DHWT - Domestic Hot Water Tank 2.3.1 Name of parts  DHWT(200/300)S-2.5H1E Ref. Qty. Name  Inspection aperture  HSW storage tank  External covering  Top cover  Thermal insulation  Control panel  Electrical Heater  Heating coil ...

  • Page 63: Unit Installation

    2 Unit installation 2.3.2 Unit installation Transport the products as close as possible to the installation location before unpacking. Check the contents of the pac- kage: •  DHWT Model •  Installation and Operation Manual & Documents 2.3.3 Selection procedure for DHWT units N O T E • DHWT appliance is intended to be installed in an indoor place. • DHWT installation must be done by professional installers. • Install the DHWT with sufficient clearance around it for operation and maintenance as shown in the following figures. • Install the DHWT where good ventilation is available. Do not install the DHWT where there is a high level of oil mist, salty air or sulphurous atmosphere. • When installing some device next to DHWT, keep clearance between DHWT and any other obstacle of more than 500 mm.

  • 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. Refrigerant and water pipe work ......................

  • Page 66: Refrigerant And Water Pipe Work

    3   Piping work and  refrigerant charge 3.1 Refrigerant and water pipe work 3.1.1 General notes before performing pipe work 1 Prepare locally-supplied copper pipes. 2 Select the piping size with the correct thickness and correct material able to withstand sufficient pressure. 3 Select clean copper pipes. Make sure that there is no dust or moisture inside the pipes. Blow the inside of the pipes  with oxygen free nitrogen to remove any dust and foreign materials before connecting them. N O T E A system with no moisture or oil contamination will give maximum performance and lifecycle compared to that of a poorly prepared system. Take particular care to ensure that all copper piping is clean and dry internally.

  • Page 67: Pipe Work And Connection

    3   Piping work and  refrigerant charge Do not fix the refrigerant and water pipes directly with the metal fittings (refrigerant piping may expand and contract). Some  examples for suspension method are shown below. For piping along For instant installation For Suspending the wall Heavies work 3.1.3 Pipe work and connection  Outdoor unit Piping connection 1 The pipes can be connected from any of the following four directions: front, rear, bottom or right side, when facing the outdoor unit.
  • Page 68 3   Piping work and  refrigerant charge Part Push down the cover slowly Rear cover Front side piping cover Rear side piping cover Make holes in the piping cover or cabinet for taking the pipes out.  Take the piping cover away from the unit, and make holes by cut- ting along the guideline at the rear of the cover or punching it with a driver. Remove the burr with a cutter. N O T E Hold the cover with a hand at the same time while removing the screws as the cover may fall down.
  • Page 69 3   Piping work and  refrigerant charge For the downward piping Part Liquid piping Wiring Gas piping Knock-out hole Bottom base N O T E The wiring must not be in contact directly with the pipes. For the rear side piping Part Rear cover N O T E Remove the rear pipe cover under the rear cover and remove the stipped 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 an insulation (field-supplied).
  • Page 70 3   Piping work and  refrigerant charge 7 Operation of stop valve should be performed according to the figure. Closed before shipment Description Remarks — Allen wrench Hex 4/5/10 mm Refrigerant Piping Field supplied — Refrigerant Pressure To outdoor unit Seat Surface Fully closed position Check Joint Only the charging those can be connected —...

  • Page 71: Refrigerant Piping Length

    3   Piping work and  refrigerant charge Evacuation and refrigerant charge Connect the gauge manifold using charging hoses with a vacuum pump or a nitrogen cylinder to the check joints of  the liquid line and the gas line stop valve. Check for any gas leakage at the flare nut connection, by using nitrogen gas to increase the pressure at 4.15 MPa  for outdoor units inside of the field-supplied piping. Operate the vacuum pump for 1 to 2 hours until the pressure decreases lower than a pressure of 756 mmHg in vacuum.
  • Page 72 3   Piping work and  refrigerant charge Item (2-10)HP Actual piping length Maximum piping length (L) Equivalent piping length Outdoor unit higher than indoor unit Maximum height difference between indoor and outdoor unit (H) Indoor unit higher than outdoor unit Refrigerant piping size Piping connection size of outdoor unit &...
  • Page 73 3   Piping work and  refrigerant charge Drain discharging boss When the base of the outdoor unit is temporarily used as a drain receiver and the drain water in it is discharged, this drain boss is used to connect the drain piping. Model Applicable Model DBS-12L RAS-2HVRN2...

  • Page 74: Refrigerant Pipe Connections

    3   Piping work and  refrigerant charge  Indoor unit Before performing the pipe work and pipe connections, the unit cover must be removed (follow chapter Indoor Unit Insta- llation in reverse). Piping location Refere to the figure below detailing the location of the refrigerant pipes, dimensions and connection sizes. N O T E There is a label behind the pipes indicating its circuit connection. RWM-(2.0-6.0)FSN3E RWM-(8.0/10.0)FSN3E Refrigerant Refrigerant liquid piping liquid piping Refrigerant Refrigerant Refrigerant gas piping Refrigerant gas piping Water inlet/outlet pipe Water inlet/outlet pipe liquid piping liquid piping...
  • Page 75 3   Piping work and  refrigerant charge •  Dimensions of the flared pipe Units: mm (inch) Nominal External diameter diameter Ø +0/-0.4 (1/4) 6.35 (3/8) 9.53 13.2 (1/2) 12.7 16.6 (5/8) 15.88 19.7 •  Thickness of the copper pipes Units: mm (inch) Nominal External Thickness diameter diameter (1/4) 6.35 0.80 (3/8) 9.53 0.80 (1/2)

  • Page 76: Brazing Work

    3   Piping work and  refrigerant charge Brazing work C A U T I O N • Use nitrogen gas for blowing during pipe brazing. If oxygen, acetylene or fluorocarbon gas is used, it will cau- se an explosion or poisonous gas. • A rust coating will appear inside of tubes if no nitrogen gas blowing is performed during brazing work. This film will be flecked off after operation and will circulate in the circuit, resulting in clogged expansion valves, etc, and the compressor will be affected. • Use a reducer valve when nitrogen gas blowing is performed during brazing. The gas pressure should be maintained within 0.03 to 0.05 MPa. If excessively high pressure is applied to a pipe, it will cause an explosion. Copper pipe size Ød1 +0.08 +0.1...

  • Page 77: Water Pipe Work And Connection

    3   Piping work and  refrigerant charge 3.2 Water pipe work and connection 3.2.1 General notes •  Install the factory supplied Shutdown Valves for connecting the Water Inlet / Outlet pipes as close as possible to the Indoor Unit,  in order to minimise flow resistance and, if necessary, for water flow regulation. •  It is advisable to use flexible joints after the Shutdown Valve for the water Inlet / Outlet piping to prevent the transmis- sion of vibrations. • ...

  • Page 78: Water Piping Connection

    3   Piping work and  refrigerant charge 3.2.2 Water piping connection  Piping location and connection size The unit is factory supplied with two shutdown valves to be connected to the water inlet / outlet pipe. By using these shut- down valves it is very practical to connect the indoor unit to the heating system by using flexible joints just bellow the valves  (G 1-1/4” connection). Refer to the figure bellow detailing the location of the Water Pipes location, dimensions and Connection sizes.

  • Page 79: Draining Pipe Work

    3   Piping work and  refrigerant charge 3.2.3 Draining pipe work Connect the drain pipe coming from the safety valve (located with the water IN/OUT pipes) to the general draining system. N O T E The safety valve will be activated when water pressure reaches 3 bars. •  Two draining ports are provided with the factory supplied shutdown valves, and a draining cap on the expansion vessel to drain the water from the indoor unit in case of servicing.
  • Page 80 3   Piping work and  refrigerant charge  Pressure Lost calculation The indoor unit is factory supplied with two Shutdown Valves which are provided with a Pressure Port. The object of these  Pressure Ports, is to offer the installer a quick connection to read the Lost Pressure in the circuit when commissioning. Plug in a differential Manometer to the Pressure Ports and open the inlet / outlet ports (1*) The Pressure Lost is calculated from the pressure difference between the value of the inlet and the outlet water pressure. N O T E If there is no having a Differential Manometer, it is possible to do this operation with just one std. Manometer (1*)

  • Page 81: Pressure Charts

    3   Piping work and  refrigerant charge 3.3 Pressure charts  RWM-(2.0-10.0)FSN3E RWM-2.0FSN3E RWM-3.0FSN3E Water flow Water flow RWM-4.0FSN3E RWM-5.0FSN3E Water flow Water flow N O T E V: Pump motor speed (V : Low, V : Medium, V : High) SMGB0070 rev.1 - 08/2011...
  • Page 82 3   Piping work and  refrigerant charge RWM-6.0FSN3E RWM-8.0FSN3E Water flow Water flow RWM-10.0FSN3E Water flow N O T E V: Pump motor speed (V : Low, V : Medium, V : High) SMGB0070 rev.1 - 08/2011...

  • Page 83: Dhwt - Domestic Hot Water Tank

    3   Piping work and  refrigerant charge 3.4 DHWT - Domestic Hot Water Tank 3.4.1 Hydraulic circuit When Piping connections are performed: 1 Connect all pipes as close as possible to the unit, so that disconnection can be easily performed when required. 2 It is recommended to use flexible joints for the piping of water inlet and outlet, so vibration will not be transmitted. 3 Whenever possible, sluice valves should be installed for water piping, in order to minimise flow resistance and to main- tain sufficient water flow.

  • Page 84: Pressure Drop

    3   Piping work and  refrigerant charge 3.4.2 Pressure drop DHWT(200/300)E-2.5H1E DHWT(200/300)S-2.5H1E  General standard for hydraulic installation The safety valve unit will fitted at the sanitary water installation. A pressure reducer must be placed in the DHWT installation. The nominal pressure of the safety unit will be 8 bar. When the main pressure is more than 6 bar a pressure reducer should be installed. The water discharge during heating (expansion) is normal.

  • Page 85: Electrical Wiring

    4 Electrical wiring E l e c t r i c a l w i r i n g Index 4.1. Unit electrical wiring and connection ..................... 48 4.1.1. General check ............................48 4.1.2. Electrical connection of outdoor unit ......................49 4.1.3.

  • Page 86: Unit Electrical Wiring And Connection

    4 Electrical wiring 4.1 Unit electrical wiring and connection 4.1.1 General check 1 Ensure that the field-supplied electrical components (mains power switches, circuit breakers, wires, connectors and  wire terminals) have been properly selected according to the electrical data indicated. Make sure that they comply  with national and regional electrical codes. 2 Following the Council Directive 2004/108/EC(89/336/EEC), relating to electromagnetic compatibility, next table indica- tes: Maximum permissible system impedance Zmax at the interface point of the user’s supply, in accordance with EN61000-3-11.

  • Page 87: Electrical Connection Of Outdoor Unit

    4 Electrical wiring C A U T I O N • Check to ensure that the indoor pump and the outdoor fan have stopped before electrical wiring work or pe- riodical check is performed. • Protect the wires, drain pipe, electrical parts, from rats or other small animals. If not protected, rats may da- mage unprotected parts, and at the worst, a fire will occur. • 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. • 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. • Electrical wiring must comply with national and local codes. Contact your local authority in regards to stan- dards, rules, regulations, etc. • Check that the ground wire is securely connected. N O T E • Check and test to ensure that if there is more than one source of power supply, that all are turned OFF. • Be sure to use a dedicated power supply. Never use a power supply shared by another appliance. 4.1.2 Electrical connection of outdoor unit The correct electrical wiring connection for the outdoor unit is shown below: 1 Using the appropriate cable, connect the power circuit to the appropiate terminals as shown on the wiring label and the illustration below.
  • Page 88 4 Electrical wiring RAS-(4-6)HRNME-AF RAS-(8/10)HRNME-AF Power wires Band Earth Ring core Transmitting Power source cable Power Earth Transmission cable Earth cable wires terminal wires 3 Connect the transmission wires between the outdoor unit and the indoor unit to the terminals 1 and 2 on the terminal board.

  • Page 89: Electrical Connection Of Indoor Unit

    4 Electrical wiring 4.1.3 Electrical connection of indoor unit  Wiring connection The correct electrical wiring connection for the outdoor unit is shown below: 1 Using the appropriate cable, connect the power circuit to the appropiatre terminals as shown on the wiring label and the illustration bellow.
  • Page 90 4 Electrical wiring  Terminal board connections Mark Part name Description TERMINAL BOARD 1 (TB1) AC 230V The mains power supply connection (230/400VAC) is wired to AC 400V terminals T,L1,L2,L3, N. TERMINAL BOARD 2 (TB2) Indoor/Outdoor commu- The H-LINK transmission between outdoor unit and indoor unit is tation cables wired to terminals 1-2.

  • Page 91: Control System

    4 Electrical wiring  Terminal board detailed connection Main power supply (TB1) The mains power connection is wired to Terminal Board 1 (TB1) as follows: Power supply: 1~ 230V 50Hz Power supply: 3N~ 400V 50Hz Indoor/Outdoor commutation cables (TB2) The transmission is wired to terminals 1-2. The H-LINK II wiring system requires only two transmission cables that connect to the indoor unit and the outdoor unit. Indoor unit Outdoor unit Room thermostat configuration...
  • Page 92 4 Electrical wiring •  Installation of the AF-RTU-01 Thermostat (Hitachi part) Remove jumper between terminals 5 and 6 of the Terminal Board 2 and connect the thermostat receiver as shown in the  following image: RF Receiver Thermostat requirements: Power supply: 230V AC. Contact voltage: 230V. N O T E • If intelligent room thermostat is selected, optional ON/OFF thermostat has no effect. • Set the configuration in the user control. See LCD User interface configuration for more information. Swimming pool Input (TB2) It is necessary to connect an external input to the Heat pump to provide a signal with Swimming pool’s Water pump is...
  • Page 93 C A U T I O N Only 3-way type valve can be connected: • Spring return 2-wire type 3-way valve: The 3-way valve should be fitted when normally working (not power into the valve). • If using SPST 3-wire valve, HITACHI is not responsible for its operation. Swimming pool valve (TB2) The unit can be used to heat Swimming pool. The signal is used for the 3-way motorized diverting valve and to provide posi- tion control of supply water flow (flow for space heating when no signal, and flow for swimming pool when signal is ON).
  • Page 94 4 Electrical wiring Mixing valve for 2 circuit control (TB2) In a mixing system (for second temperature level), the mixing valve is controlled to maintain the required supply tempera- ture. Item Name Description Left Close 15 17 16 Neutral Neutral Vmix Right Open...
  • Page 95 DHW temperature itself. EH DHWT Electrical heater input N O T E For the HITACHI Domestic Hot Water Tank (DHW200/300(E/S)-2.5H1E) the Terminal connections will be terminals 3 and 4. Solar output (TB2) When solar mode is enabled by the heat pump and the temperature in the solar panel rises above the water temperature in the domestic hot water tank, Heat pump outputs will be switched ON.
  • Page 96 4 Electrical wiring Thermistors The DHW sensor (THM ) is used to control the domestic hot water storage tank. Water sensor (THM ) for hydraulic separator or buffer tank and boiler combination. The mixed supply sensor (THM ) is used in systems with a mixing valve and should be positioned after the mixing valve and the circulation pump on the second circuit. 2nd ambient sensor (THM ) is used when the heatpump is located in a position not suitable for this measura- AMB2...

  • Page 97: Setting Of Dip Switches And Rsw Switches

    4 Electrical wiring 4.2 Setting of DIP switches and RSW switches 4.2.1 Outdoor unit  Location of DIP switches and RSW switches The PCB (see the electrical wiring diagram - plane a) in the outdoor unit is operated with different dip switches, rotary switches and push switches.

  • Page 98: Optional Functions 7

    4 Electrical wiring DSW2: Piping length/selection function Function Setting position Setting before shipment 1 2 3 4 5 6 5 m < Lt 1 2 3 4 5 6 Piping length Lt > 30 m 1 2 3 4 5 6 5 m <...
  • Page 99 4 Electrical wiring DSW4/RSW1: Refrigerant cycle setting (No change) Setting position (DSW4) Setting position (RSW1) Setting for tens Setting for units (second digit) (first digit) 1 2 3 4 5 6 Rotary switches’ positions (RSW1) are set by inserting a screw driver into the groove. DSW5: Transmission setting of end terminal resistance Before shipment, No.

  • Page 100: Indoor Unit

    4 Electrical wiring 4.2.2 Indoor unit  Location of DIP switches and RSW switches Below are the dip switch positions: Upper side shows unit status Lower side shows unit status 2 Status indication. Press PSW2 more than 3 seconds to change the status display mode N O T E • The mark “■” indicates the dip switches positions.
  • Page 101 4 Electrical wiring  Functions of dip switches and rotary switches DSW1: Not used DSW2: Unit capacity setting RWM-2.0FSN3E RWM-3.0FSN3E RWM-4.0FSN3E RWM-5.0FSN3E RWM-6.0FSN3E RWM-8.0FSN3E RWM-10.0FSN3E DSW3: Additional settings Setting before shipment N.A (not used) N.A (not used) 1-step heater for 3-phase unit N.A.
  • Page 102 4 Electrical wiring DSW4: Additional setting Setting before shipment Optional functions enabled Heater Forced OFF N.A. (Not used) Standard / ECO water pump operation Emergency operation heater Cooling operation Outdoor sensor accessory N.A (not used) N O T E Never activate Heater Forced OFF and Emergency operation heater at the same time. C A U T I O N Never turn all DSW4 dip switch pins ON. If this happens, the software of the unit will be removed.
  • Page 103 4 Electrical wiring RSW1 & RSW2: Refrigerant cycle setting Refrigerant cycle setting: RSW1: Ten digits RSW2: Unit digits RSW3 & RSW4: Indoor unit address setting Refrigerant cycle setting: RSW3: Ten digits RSW4: Unit digits  Led indications LED1: Pump operation LED1 Status Pump operation ON...
  • Page 104 4 Electrical wiring LED5: Power supply indication Status LED5 Supply ON Supply OFF LED6: Alarm indication Status LED5 Alarm ON ON (flick) Alarm OFF LED7: Not used LED8: H-Link transmission indication  Operation display (seven-segments PCB) Operation display at normal operation Segment display: Segment Display Upper...
  • Page 105 4 Electrical wiring Check indicator Combination of checking switches (▲: PSW2▼: PSW1) displays the  three indications shown below: ▲: PSW2 ▼: PSW1 Function name Detail of display Water temps, ○ Check indicator cycle temps, etc ○ : Press for more than 3 sec Press PSW2 for more than 3 sec. Normal Display Check  indicator Press PSW2 for more than 3 sec.
  • Page 106 4 Electrical wiring Š Summary table of “Check indication” Code Display Data display Description Heat water Temperature Setting (ºC) Cold Water Temperature Setting (ºC) Water Inlet Temperature (THM ) (ºC) Water outlet Temperature (THM ) (ºC) Water outlet Temperature HP (THM ) (ºC) WOHP Water outlet Temperature Circuit 2 (THM ) (ºC) Water outlet Temperature Boiler (THM...

  • Page 107: Common Wiring

    4 Electrical wiring 4.3 Common wiring C A U T I O N All the field wiring and electrical components must comply with local codes. 4.3.1 Electrical wiring between outdoor and indoor unit Connect the electrical wires between the indoor unit and the outdoor unit, as shown in the next diagram. Follow the local codes and regulations when performing the electrical wiring.

  • Page 108: Wire Sizes

    4 Electrical wiring 4.3.2 Wire sizes •  Recommended minimum sizes for field provided wires Transmi- Power supply Actuator ting Cable Max. Required Required Required cable size cable size Size Model Power supply Current number number number of wires of wires of wires EN60335- EN60335-1 EN60335-1 RWM-2.0FSN3E 4.0 mm²...

  • Page 109: Dhwt - Domestic Hot Water Tank

    4 Electrical wiring 4.4 DHWT - Domestic Hot Water Tank  General check 1 Ensure that the field-supplied electrical components (mains power switches, circuit breakers, wires, connectors and  wire terminals) have been properly selected according to the electrical data indicated. Make sure that they comply  with national and regional electrical codes. 2 Electrical connection must be done by professional installer. 3 Check to ensure that the power supply voltage is within +/-10% of the rated voltage. 4 Make ensure that power supply has an impedance low enough to warranty not reduce the starting voltage more than  85% of the rated voltage. 5 Check that the earth wire is securely connected, tagged and locked in accordance with national and local codes.

  • Page 110: Electrical Wiring Connection

    4 Electrical wiring  Electrical wiring connection The electrical wiring connection between DHWT and Yutaki system is as follows: Customer connection: Power supply: Electric heater DHWT Sensor DHWT 1~ 230V 50Hz Pump con- nection  Wire size •  Recommended minimum size for field provided wires: Power supply EH control Sensor cable Maximum cable size cable size size Model Power supply current (A)
  • Page 111 4 Electrical wiring  Electrical wiring connection diagram Power cable Control cable (To system control unit) Main switch Ref. Name Regulating and Safety thermostat Auxiliary Relay Operating Mode switch R 123 Electrical Heater LED1: POWER ON LED2: AUTO MODE ON LED3: Electrical Heater Manual Terminal Board L/N/T...

  • Page 112: Internal Wiring

    4 Electrical wiring  Internal wiring Internal Wiring Connection Power cable Control EH cable Sensor DHWT cable Detail D  Cathodic protection Anode-Control Test In order to protect the inside of the vessel from corrosion all the enamelled DHWT can be equipped whit a cathodic pro- tection unit, comprising magnesium sacrifice anodes, charge gauges and wiring of connection.
  • Page 113 • Do not install the permanent cathode protection and the cathodic protection together.  Titanium protection accessory All the Hitachi DHWT can be equipped with the permanent cathode protection system which is totally automatic and maintenance free. It basically comprises a titanium anode (1) mounted on the storage tank’s connection plate (2) and connected to a poten- tiostat (3) which automatically regulates the input current to the anode, constantly measuring the potential of the storage tank), through the leads (4).Wiring the anode to the potentiostat by means of leads (4) is carried out in the following way:...

  • Page 114: Electric Heater

    4 Electrical wiring  Electric heater The electric heater is made of Incoloy alloy 825 and complies with the European Low Voltage Directive 2006/95/EC. It comprises a flange that holds three U-Shaped heating elements for 2.5kw power resistances. Replace electric heater The steps to be followed are: 1 Totally disconnect the unit from the main power supply. 2 With the help of a tool remove the heater to be replaced.
  • Page 115 4 Electrical wiring DHWT(200/300)S-2.5H1E Ref. Name  Flange  Heater  Seal To earth terminal of the control panel  Washers To the top flange To terminal 5 and 6 of the control panel  Screws  Studs  Nuts  Metal protective casing ...

  • Page 116: Electrical Wiring Diagrams

    4 Electrical wiring 4.5 Electrical Wiring Diagrams 4.5.1 Electrical wiring diagram for indoor unit  RWM-(2.0-6.0)FSN3E SMGB0070 rev.1 - 08/2011...
  • Page 117 4 Electrical wiring  RWM-(8.0/10)FSN3E SMGB0070 rev.1 - 08/2011...

  • Page 118: Electrical Wiring Diagram For Outdoor Unit

    4 Electrical wiring 4.5.2 Electrical wiring diagram for outdoor unit  RAS-2HVRN2 SMGB0070 rev.1 - 08/2011...
  • Page 119 4 Electrical wiring  RAS-3HVRNME-AF C110 Q203 Q204 CP21 CP22 C208 C105 C109 CP13 R112 CP19 C108 LED201 ê‘ C104 CP14 CP23 Lot No. C100 R113 R109 R114 CP18 CP15 LED202 CP27 R110 CP25 CP10 CP24 CP11 CP12 CP30 CP29 C201 R304 R210...
  • Page 120 4 Electrical wiring  RAS-(4-6)HVRNME-AF SMGB0070 rev.1 - 08/2011...
  • Page 121 4 Electrical wiring  RAS-(4-6)HRNME-AF SMGB0070 rev.1 - 08/2011...
  • Page 122 4 Electrical wiring  RAS-(8/10)HRNME-AF SMGB0070 rev.1 - 08/2011...

  • Page 123: Control System

    5 Control system C o n t r o l s y s t e m Index 5.1. Device control system ........................... 86 5.2. Printed circuit board ..........................87 5.2.1. Indoor unit ..............................87 5.2.2. Outdoor unit ............................... 88 5.3. Safety protection and control device .....................

  • Page 124: Device Control System

    5 Control system 5.1 Device control system The figure below shows the outline of the control system. Wireless remote Wireless remote control switch control switch 2 Multiple signals Wireless transmission circuit Single signals Suction gas pressure sensor Thermistor for water inlet (Receiver) Discharge gas pressure sensor Thermistor for water outlet Operation signals Thermistor for water outlet 2 Thermistor for outdoor temperature...

  • Page 125: Printed Circuit Board

    5 Control system 5.2 Printed circuit board 5.2.1 Indoor unit •  PCB Drawing PCB1 PCB2 Connector Indications PCB1 Name Connector Nº Power supply PCN1 Power supply 2 PCN2 Power Transformer power supply (230v) PCN3A,B Transformer power supply (24v) CN10A,B LCD Power supply CN15 Low Water Pressure &...

  • Page 126: Outdoor Unit

    5 Control system 5.2.2 Outdoor unit  RAS-2HVRN2 PCB1 LED indication LED1 Power source for the PCB LED2 Green This LED indicates the inverter transmission status This LED indicates the transmission status LED3 Yellow between the indoor unit and the outdoor unit LED351 For inspection LED353...
  • Page 127 5 Control system  RAS-(3-10)H(V)RNME-AF Connector indication Switch indication PCN1 Fuse DSW1 Test run (PCB1) PCN2 PCB1 connection from outdoor to indoor unit DSW2 Piping length and selection function PCN5 Crankcase heater of compressor (oil) DSW3 Capacity code PCN6 Output optional function DSW4/ PCN7 Output optional function Refrigerant cycle number RSW1...

  • Page 128: Safety Protection And Control Device

    5 Control system 5.3 Safety protection and control device 5.3.1 Indoor unit MODEL RWM-(2.0/3.0)FSN3E RWM-(4.0-6.0)FSN3E RWM-(8.0/10.0)FSN3E For Electric Heater Manual reset, Non-adjustable (one per unit) Surface Thermostat 75ºC±5% Non-reset (needs to be replaced), Non-adjustable (one per unit) Thermal fuse 110ºC +0 -5% Fuse capacity For Water circulation Low water pressure switch Automatic reset Open 1 bar Close...

  • Page 129: Standard Control Functions

    5 Control system 5.4 Standard control functions 5.4.1 Indoor Unit  Space heating Main heating configuration Available system configuration is as follows: Configuration 1: Direct Circuit High temperature Low temperature (45~60 ºC) (30~35 ºC) Aux Heater The unit is connectable to only one circuit demand, either high temperature (i.e., radiator or fan coils) or low temperature (radiant floor).
  • Page 130 5 Control system Configuration 2: Direct and mixing circuit (two levels of water outlet temperature) Zone 2: Low temperature (30~35 ºC) Zone 1: High temperature (50~60 ºC) Second temperature control Secondary water pump Aux Heater Motorized 3way valve H y d r a u l i c Separator When the YUTAKI S is connected to two different heating circuits, circuit 1 will be direct (high temperature for radiator operation) and circuit 2 will be a mixing circuit in order to have a second temperature control using mixing valve (low tem-...
  • Page 131 5 Control system Water temperature set-point Each of the 2 water circuits will have an independent water set-point. Water circuit set-point configuration can be set as follows: CODE Description Default Value CIRCUIT 1 (Direct circuit) 3-004 WTh1 Water Calculation Heating C1 (None; OTCpoints; OTCgradient; Fix) OTCgradient CIRCUIT 2 (Mixed circuit) 3-104 WTh2 Water Calculation Heating C2 (None;...
  • Page 132 5 Control system OTC Points: Outside temperature compensated (OTC) control by points OTC Points system will use average outdoor ambient temperature in order to get the water temperature set-point. Water set-point will be determined using the following rule: Water temperature set-point ºC (44) Tsh (20) Tsh Outdoor ambient temperature (ºC)
  • Page 133 5 Control system OTC Gradient: Outside temperature compensated (OTC) control by gradient Water target is selected by an Outside Temperature compensated (OTC) control that is defined by a different gradient of  the curve. The initial point of the curve is always 20ºC-20ºC (Water outlet target 20ºC at outdoor ambient temperature of 20ºC). The gradient of the heating curve describes the relation between the change in the supply temperature and the change in outside temperature.
  • Page 134 5 Control system Fixed water temperature set-point Outdoor ambient temperature has no effect on this setting. The user will select a fixed water outlet temperature setpoint. Water temperature setpoint ºC Outdoor ambient temperature (ºC) Where: : Fixed temperature setting n: heating circuit number (n= 1 or 2) CODE Description Default Value Range Steps Units CIRCUIT 1 (Direct circuit) 3-010 Fixed Tº...
  • Page 135 5 Control system Second water temperature control The mixing valve is controlled to maintain the second heating supply temperature at the second heating temperature set-point. The mixing valve position is calculated with a proportional integral action (P+I) control algorithm based on the difference between the heating supply set-point and the heating supply temperature.
  • Page 136 5 Control system Selection of heating circuit minimum/maximum temperature limits by Installer The installer will limit the Space Heating Temperature Set-point in order to prevent excessively high or low temperatures in the space heating. Water outlet temperature set-point ºC Maximum water temperature Tmaxh Tminh Minimum water temperature...
  • Page 137 5 Control system  Space cooling Water circuit configuration N O T E The air to water heat pump is pre-configurated to work only in heating mode. In order to allow the cooling mode, it is necessary to perform a dip-switch setting and install the drain pan accessory. In the case, all the cooling mode uses for the unit will be permitted and the LCD user’s interface cooling configuration will appear. In case of heating istallation working also in cooling operation, the responsability of correct system functioning will be of the installer. The configuration examples given below are only for illustration purposes. •  Main cooling configuration Configuration 1: Direct Circuit Low temperature Medium tempera- (5~12 ºC) ture (16~21 ºC) Aux Heater The unit is connectable to only one circuit demand, either low temperature (i.e., fan coils) or medium temperature (refres- hing floor).
  • Page 138 5 Control system Configuration 2: Direct and mixing circuit (two levels of water outlet temperature) Zone 2: Medium temperature (16~21 ºC) Zone 1: Low temperature (5~12 ºC) Second temperature control Secondary water pump Aux Heater Motorized 3way valve Hydraulic Separator When the YUTAKI S is connected to two different cooling circuits, circuit 1 will be direct (low temperature for fanoils ope- ration (12~5ºC)) and circuit 2 will be a mixing circuit in order to have a second temperature control using mixing valve ...
  • Page 139 5 Control system Space cooling general control conditions If “Water Type heating” reads “None” (disabled), then all space control cooling is disabled. Space Cooling mode is activated by any of the following events: Space Cooling mode selected by user (YUTAKI S LCD controller) and Space Cooling mode activated by external thermostat signal (ATW-RTU-01) (Installation Option 1) or Space Cooling mode activated by intelligent thermostat (ATW-RTU-02) (Installation Option 2) Space Cooling mode is disabled if:...
  • Page 140 5 Control system Outside temperature compensated (OTC) control for refreshing floor The weather-dependent set-point field settings define the parameters for weather-dependent operation of the unit. When  weather-dependent operation is active the water temperature is determined automatically depending on the outdoor tem- perature: higher outdoor temperatures will result in colder water and vice versa. Water Outlet temperature set-point ºC Outdoor ambient temperature ºC Where: hc: Temperature setting for max water temperature at low ambient temperature cooling...
  • Page 141 5 Control system Fixed water temperature setting OTC has no effect on this setting. The user will select a fixed water outlet temperature between 5ºC and 21ºC using the  user interface (LCD Controller). Outlet temperature set-point ºC Outdoor ambient temperature (ºC) Where: : Fixed water temperature setting. n: heating circuit number (n= 1 or 2). CODE Description Default Value Range Steps Units CIRCUIT 1 (Direct circuit) 3-018...
  • Page 142 5 Control system Second water temperature control The mixing valve is controlled to maintain the second cooling supply temperature at the second cooling temperature set- point. The mixing valve position is calculated with a proportional integral action (P+I) control algorithm based on the diffe- rence between the cooling supply set-point and the cooling supply temperature.
  • Page 143 5 Control system Selection of cooling circuit minimum/maximum temperature limits by Installer The  maximum  temperature  limit  can  be  used,  for  example,  to  prevent  low  temperatures  from  reaching  floor-refreshing  systems. The minimum temperature limit can be used when a minimum level of cooling in the cooling circuit is desired. Water Outlet temperature set-point ºC Maximum water temperature Tmaxc...
  • Page 144 5 Control system  Room Thermostat control YUTAKI S unit can be used with two different Room Thermostats available as accessories: ON/OFF Thermostat (ATW-RTU-01) Intelligent Room Thermostat (with Opentherm communication) (ATW-RTU-02) with extension room thermostat for second circuit (ATW-RTU-03) Thermostat Type is selected using the parameter list on user interface: CODE Description Default Value...
  • Page 145 5 Control system •  Minimum on time and ON/OFF time cycle In order to reduce Thermo ON/OFF Cycles per hour, there are two additional functions for ON/OFF Thermostat. These two functions are: a. Minimum ON Time: When Thermostat is demanded, a minimum ON time will be applied (including when demand is OFF) b.
  • Page 146 5 Control system Intelligent room thermostat (accessory ATW-RTU-02/03) When an intelligent room thermostat is installed (as accessory), the unit and Room Thermostat communicate by means of the receiver and Opentherm communication. Room thermostat sends the actual room temperature and room temperature setting to the unit. Unit Intelligent Thermostat Thermostat Zone 1...
  • Page 147 5 Control system In this case, for a 2K change in room set-point, the supply is changed by 4K. 20 ºC (default room Outlet temperature set-point ºC temperature condi- tion) OTC offset x2 18ºC (room set-point) Outdoor ambient temperature (ºC) N O T E Room set-point factor has no effect on setting fixed temperature operation.
  • Page 148 5 Control system New water temperature set-point is calculated as follows: Ttwo = Ttwo OTC + Rfact x ( RS - RT) Where: Ttwo: Resulting Water Set-Point Ttwo OTC : Water Set-Point as calculated by OTCn. Rfact : Room compensation factor (Default 2) RS: Room set point RT: Room temperature Example:...
  • Page 149 5 Control system •  Thermo OFF condition by room thermostat If Room Temperature Roff is higher (heating operation) or lower (cooling operation) than Room Temperature set-point, it must also be set to THERMO OFF (Compressor OFF, Heater OFF,…) and water pump must be turned OFF after over-run time (if ECO Pump is selected).
  • Page 150 5 Control system  Circuit water pumps Main water pump for heating or cooling circuit application •  Pump configuration (Standard & Economy function) Pump control can be set to standard or Economy mode. This configuration is set using DSW4 pin 5. When pin is OFF, pump will be in standard operation and pump always be in operation when space heating or cooling is enabled, but when space heating or cooling is disabled using the LCD user interface or Thermostat OFF (intelligent ther- mostat only), pump must be switched OFF and only switched ON by Domestic Hot water request.
  • Page 151 5 Control system •  Overrun pump delay All pumps are no longer required; operation must continue at least until pump overrun time has passed since end of re- quirement. Request Heat Demand by Thermostat No request Water Pump Stop 7-001 Time CODE Description...
  • Page 152 5 Control system Pump seizure protection The pump seizure protection function helps to prevent these components from sticking during long periods of inactivity. Every week the components will be run for a short period. Pumps are switched on for 1 minute. Heat Demand by Thermostat Space Heating/ Cooling status Water Pump WEEK 1 WEEK 2 Time CODE Description Default Value Range Steps Units Disabled 8-002 SeizPr Seizure Protection Status Disabled Enabled...
  • Page 153 5 Control system  Auxiliary electric heater for space heating All units are delivered with an integrated electric heater for additional heating capacity during cold outdoor temperatures. The electrical heater also can be used for emergency operation in case of outdoor unit malfunction. The electrical heater is available for a heating capacity of 3,6 and 9 kW, depending on unit capacity selected.
  • Page 154 5 Control system •  Heater wait time If Water set-point (Ttwo) ≤ Maximum Heat Pump Operation, Electric Heater will be only allowed to operate when more than  electrical heater waiting time (5-005) Wait Time has passed since Heat Pump was started. When Water set-point (Ttwo) > Maximum Heat Pump Operation or when heater needs to operate in emergency mode, Electric Heater may be operated regardless of Wait time.
  • Page 155 5 Control system Heater for emergency mode When user allows emergency mode (DSW4-4 ON), heater may operate in said mode. This configuration allows also Hot Sanitary Water emergency operation. N O T E For more information refer to chapter Optional functions.  Boiler combination for space heating Boiler operation Boiler will only operate if unit is in Space Heating or Hot Sanitary Water modes. It will always be disabled in any other mode (Swimming Pool and Cooling mode).
  • Page 156 C A U T I O N • Be sure that the boiler and the integration of the boiler with the YUTAKI S system is in accordance with relevant European and national regulations. • HITACHI can not be held responsible for incorrect or unsafe situations in the boiler system. • Make sure that return water to the YUTAKI S heat exchanger never exceeds more than 57ºC. • Make sure that the non-return valves (field supplied) are correctly installed in the system as shown in the illustration above. •  Boiler bivalent point Unit should be sized to operate mainly in heat pump mode.
  • Page 157 5 Control system Target temperature •  Space heating Being a parallel system (either Heat Pump or Boiler), water setting will be the same as the water set-point for Heat pump without outdoor unit temperature restrictions but with restrictions of Maximum water temperature by installer. • ...
  • Page 158 5 Control system Boiler minimum and maximum times Boiler can only be stopped after minimum ON time has passed (6-004). Boiler can only be started after minimum OFF time has passed (6-005). Request Heat Demand by Thermostat No request Request Boiler demand No request 6-006...
  • Page 159 5 Control system  Use of boiler + electric heater When using Boiler + Heater, unit normally operates in heat pump, and the heater supplies the extra heating necessary. Heater till certain extreme outdoor temperature and Boiler will only operate when temperature is too low for Heat Pump and Heater.
  • Page 160 5 Control system  Domestic Hot Water (DHW) An optional domestic hot water tank can be connected to the YUTAKI S Indoor unit. The domestic hot water tank is availa- ble in four models: 200 or 300 liters, enamelled or stainless, with integrated electrical Heater (See available accessories). Refer to the domestic hot water tank installation manual for more details. Sanitary water will only operate if it is enabled from LCD user interface: CODE Description Default Value...
  • Page 161 5 Control system Maximum set-point selected by Installer In order to avoid excessively hot water in the tank, there is an additional function that allows the installer to set a maximum  temperature. CODE Description Default Value Range Steps Units 3-122 DHW maximum set-point Tº 40~70 ºC DHWMAX N O T E Antilegionella function has no effect. High demand mode differential (T DHWON Sanitary Water Heater will start when following conditions are met: • ...
  • Page 162 5 Control system Heat pump operation for DHW (T & T HPON HPOFF During Heat Pump operation for DHW, sanitary water tank is heated using heating water circuit. Since there is no sensor inside the heating circuit for sanitary water tank, water outlet temperature is used to control sani- tary tank heating. Heat pump operation for sanitary water starts when T is lower than T HPSTART Heat pump operation for sanitary water stops when T is greater than T .
  • Page 163 5 Control system Working example using STANDARD DEMAND mode and default values except T set Case 1. DHWS At this point T (ºC) consider that load =70ºC DHWS is bigger than heater capacity = 60ºC HPMAX 54ºC HPSTOP = 44ºC HPSTART Time HP Operation Heater Operation N O T E This example does not consider the possible constraints due to timing between changes.
  • Page 164 5 Control system DHW second cycle wait time This defines the minimum time between two consecutive domestic hot water heat pump cycles. Sanitary Water will not start if: Sanitary Water Off Time < (3-028) CDHW Heater Start-Up by T (High Demand Differential) is not limited by this function. DHWON Sanitary Water start-up by T &...
  • Page 165 5 Control system Space heating priority temperature If Space Heating Priority function is enabled, Heat Pump operation by Sanitary mode will stop if: Text (ambient temperature) < SHPT (3-031). When Heat Pump operation is stopped by this function it will continue working using Heater operation if stoppage condi- tions for heater are not met. CODE Description Default Value Range Steps Units...
  • Page 166 When the swimming pool operation is required, the swimming pool pump starts to operate given the swimming pool pump feedback. In this situation, the 3-way valve of the DHWT is not activated and the 3-way valve for the swimming pool chan- ges its normal position diverting to the swimming pool heat exchanger, allowing to heat the swimming pool water tempe- rature to a comfortable value. HITACHI DHWT Accessory Space Heating & Cooling Space Heating & Cooling...
  • Page 167 Pump & Control above the water temperature in the Solar Panel HITACHI DHWT Accessory Sensor Solar 2 domestic  hot  water  tank,  the  pumps  (Field supply) from the solar pump station and the solar  kit  begin  operating  in  order  to ...
  • Page 168 5 Control system Solar installation requirements •  Electrical connection The solar pump station have an auxiliary contact that closes when the operation station it is working to heat the domestic  hot water tank operated. Terminal Board YUTAKI S Unit Solar Pump station When solar mode is enabled by the heat pump and the temperature of the glycol solution in the solar panel has risen above the water temperature in the domestic hot water tank, one of the HP’s outputs will be switched ON (terminals 25/26).
  • Page 169 5 Control system Setting the solar status This default setting can be changed, so that at all times, when solar heat becomes available, domestic water heating by the heat pump will be (if busy) interrupted and taken over by the sun. CODE Description Default Value 10-001 Solar status (Disabled, Enabled) Disabled Solar enabling/disabling conditions • ...
  • Page 170 5 Control system Maximum time solar heating for DHW In some high demand cases this function controls the maximum time that Sanitary Water can operate using Solar power alone. Heater operation is not affected by it. Solar power will be stopped when: Solar Operation Time >...

  • Page 171: Installation Information

    5 Control system  Room Thermostat Unit installation and configuration (as accessory) Description ON/OFF Intelligent The Room Unit communicates with the RF Receiver on an 868MHz (ATW-RUT-01) (ATW-RTU-02/03) Radio  Frequency  (RF) band  to  control  the Yutaki  S system. Neither  product will communicate with other RF products that use different frequencies or communication protocols.
  • Page 172 5 Control system  Installing the Programmable thermostat Please follow the illustrations and information below in sequence to install the RF Receiver and Room Unit correctly. To enable special features and see what other system options are available refer to section Installer Mode.
  • Page 173 5 Control system Installing Intelligent Receiver (ATW-RTU-02) Please follow the illustrations and information below in sequence to install the RF Receiver and Room Unit correctly. To enable special features and see what other system options are available refer to section Installer Mode.
  • Page 174 5 Control system Installing the Room Unit (ATW-RTU-01/02/03) •  Power Up Installing the Batteries: a. Lift up the front cover of the Room Unit to reveal the battery cover and product controls. b. Remove the battery cover by pressing down and sliding out. c.
  • Page 175 5 Control system RF Communication check (test mode) (ON/OFF Thermostat) (ATW-RTU-01) To check the RF communication, hold the Room Unit about 2-3 metres from the installed RF Receiver. Set the Room Unit to off by pressing the button. then press the buttons together with the button for 3 seconds. The unit will display ‘tESt’ and it will send test signals to the RF Receiver. If the test signals are received the LED on the RF Receiver, will flash between 1 and 5 times. Flashing the green LED on every 5 seconds (relay output will remain off) for a maximum ...
  • Page 176 5 Control system Communication loss (Only Intelligent thermostat) (ATW-RTU-02/03) In the event of an RF communications loss, the LED on the RF Receiver will indicate which type of fault has occurred. •  If there is a communications fault between the RF Receiver and the Room Unit, then the LED on the RF Receiver will flash red for 0.1 sec ON every three seconds.
  • Page 177 5 Control system Fail-Safe Mode Setup (ON/OFF Thermostat) (ATW-RTU-01) The fail-safe mode defines the RF Receiver box output relay status if the RF communication is lost (e.g. when the Room  Unit stops communicating due to discharged batteries). The factory setting keeps the relay permanently off when the communication is lost. Fail-Safe mode setup (Intelligent thermostat) (ATW-RTU-02/03) The fail-safe mode defines the system status if the RF communication is lost (e.g. when the Room Unit stops communi- cating due to discharged batteries). If the system is a direct (radiator one), then the factory setting will make the system  revert to a set point of 10°C for frost protection. If indirect loops are added, the system will continue to operate at the last communicated setpoint.
  • Page 178 5 Control system Using the Room Unit for specific applications (Intelligent thermostat) (ATW-RTU-02/03) The Room Unit is a versatile controller that can be used to control many different applications. Please note that when the Room Unit is installed in conjunction with a System Controller, the functionality will differ to that when installed with a  standard boiler system. Most of the functions shown below will be controlled by the System Controller and be set within its parameters.
  • Page 179 5 Control system •  Category 2 - System Settings N O T E To ensure correct heat pump system operation, parameter 8:Su must be set correctly. Parameter Parameter Factory Default Setting Optional Setting Category 2 Parameters – System Settings (press the button to access this category) Heat/Cool selection enable 4:HC Disabled Enabled / disable Room Temperature Sensor Programmer and room...
  • Page 180 5 Control system Binding/Rebinding Procedure (Intelligent thermostat) (ATW-RTU-02/03) Binding is a necessary process in order to link the room thermostat with the wireless receiver and assign them to the co- rresponding circuit on the YUTAKI S controller. Make sure the room thermostats are shut down before starting the binding process. They must be in the Off position. First, reset the wireless receiver by holding down the button for BINDING CIRCUIT 1 15 seconds. This will erase the receiver’s current configuration. Next, prepare the wireless receiver to link it to the room thermos- tat and unit. Press and hold the receiver button for 5 seconds. CANCEL START Next, select the circuit to be linked inside the binding zone. Af-...
  • Page 181 5 Control system N O T E The same process applies to circuit 2 when selected on the menu. In summary, the binding process for intelligent thermostat follows the steps below: Ensure that thermostats are in the off position. Press the button on the receiver for 15 seconds in order to remove the current configuration.  Press the button on the receiver for 5 seconds. Select the circuit to be linked on the binding menu. Press the start button on the screen. Start the binding mode on the thermostat. Refer to its instruction manual. Press Ok button on the thermostat to confirm binding. ...
  • Page 182 Room Unit •  Description The Hitachi programmable wireless Room Unit is designed to control your heating system efficiently, providing comfortable  temperatures when you are at home and energy savings when you are away. The following instructions explain how to program and use the Room Unit to provide the most home comfort at the least cost.
  • Page 183 5 Control system This section shows you how to setup and run the Room Unit in 3 simple steps: SteP 1: Installing the Batteries N O T E Please follow the instructions in this section only if the Room Unit screen is blank (no symbols or digits are dis- played). If the room temperature is already displayed move on to Step 2: Setting the Day and Time. To install the Batteries: a. Lift up the front cover of the Room Unit to reveal the battery cover and product controls. b.
  • Page 184 5 Control system Programming the Room Unit (Heating) The Built-in Heating Program The built-in heating program has 6 temperature level changes per day that can be set between 3.00 am and 2.50 am the fo- llowing day - allowing you to maintain the evening temperature after midnight. Each temperature level can be set between 5°C and 35°C, and adjusted in 0.5°C increments. The factory default program for heating is as follows.
  • Page 185 5 Control system Š You now have a choice of how to set the program for the next day: f. i) Press the  button to copy Monday’s program into Tuesday. The display will go blank apart from the ‘non flashing’  day indicator, which indicates the day copied and the ‘flashing’ target day to copy the program to. To accept this  day press the green button. To select a different target day press the  button until the ‘flashing’ day indicator  is under the required day, then accept it by pressing the green button.
  • Page 186 5 Control system •  During Normal Operation Š Temperature Override During normal operation (AUTO ( ) or MAN ( ) mode) the programmed temperature can be adjusted manually by pres- sing the buttons or the  button. The ‘target’ temperature will be displayed and flash for 5 seconds - during this  time the buttons can be used to modify the set value. N O T E This temperature override is cancelled at the next programmed temperature change.
  • Page 187 5 Control system •  If something happens to my heating system how can I check that the thermostat is working? Refer to the Troubleshooting Guide. If you still need assistance after this call your installer. The thermostat should only be opened or removed by a qualified professional to prevent possible injury from electric shock and/or damage to the product. Symptom Possible Cause Remedy Check to see if there are batteries in the battery  Batteries not installed. compartment and the paper tab has been removed. The Room Unit has a blank LCD ...

  • Page 189: Lcd User's Interface

    6 LCD user’s interface L C D u s e r ’ s i n t e r f a c e Index 6.1. Description of the hardware ........................ 152 6.1.1. Button definitions ............................. 152 6.2. Comprehensive view ........................... 152 6.3. Description of the icons ........................

  • Page 190: Description Of The Hardware

    6.1.1 Button definitions The control’s operating mode is very simple, with 7 user-friendly buttons. Button descriptions: HITACHI On/Off: From the comprehensive view, this switches the selec- ted area on or off. If no area is selected, the entire unit will be switched on or off.
  • Page 191 6 LCD user’s interface  Time and date    Displays the current date and time information. The information displayed may be changed on the control configuration menu.  Alarm indication  Alarm indication will appear when an alarm is detected. The  alarm icon and alarm code will appear. ...

  • Page 192: Description Of The Icons

    6 LCD user’s interface 6.3 Description of the icons Icon Name Values Explanation Circuit I or II is in Demand-OFF Circuit I or II is on Thermo-OFF Circuit I or II is working far from the desired temperature Circuit I or II Status Circuit I or II is working near from the desired temperature Circuit I or II is working on the desired temperature ANTL ANTL Anti-legionella is activated and working DHW is on Thermo-OFF DHW is working far from the desired temperature DHW Status DHW is working near from the desired temperature...
  • Page 193 6 LCD user’s interface Icon Name Values Explanation Compressor Compressor is enabled Alarm Existing alarm. This icon will appear with the alarm code Boiler Boiler system is working Tariff When tariff signal is received, the operation restriction is applied When the timer is configured and enabled, this icon will go with the active timer  DHW Timer number Defrost Defrost function is active Test Run...

  • Page 194: Controller Configuration

    6 LCD user’s interface 6.4 Controller configuration Control configuration contains different configuration options for the control. Those options are explained in the following  items.  Time and date Setting the time and date will show the following options: Configuration can be switched between: Complete: display will show date and time Time: display will only show the time Date: display will only show the date aligned to the right None: hide time and date Time format options can be switched between: TIME AND DATE...

  • Page 195: Unit Configuration

    6 LCD user’s interface 6.5 Unit configuration The following chapters explain all the items contained on the Unit configuration for the user. N O T E Menus may be modified during configuration. Configuration will hide or display available options. For example, if Circuit 2 is disabled, all circuit 2 options will be hidden. 6.5.1 Operation display This is the list of operation display parameters that can be consulted. All of them are read-only. Most of these variables are the same ones that can be consulted by 7-segment, taking information from the outdoor unit. CODE Description Default Value...

  • Page 196: Space Heating Configuration

    Each circuit will have its own Water Calculation type for heating. Booth circuits may be configured as: Point Gradient HITACHI None WATER CALCULATION Tº C 1 WATER CALCULATION Tº C1 To switch between them the variable type must be edited.
  • Page 197 6 LCD user’s interface  WATER CALCULATION Tº C 1 WATER CALCULATION Tº C1 Type This calculation mode sets the circuit’s temperature setting to a defined value, forcing the unit to maintain it.  None WATER CALCULATION Tº C 1 WATER CALCULATION Tº C1 Type None The None option sets the circuit as disabled. ...

  • Page 198: Space Cooling Configuration

    6 LCD user’s interface 6.5.3 Space cooling configuration In space cooling, the water calculation types work in the same way  as for space heating, without the gradient view. This leaves the following water calculation types: Point None To switch between them the variable type must be edited. WATER CALCULATION Tº C1 WATER CALCULATION Tº...
  • Page 199 6 LCD user’s interface  None WATER CALCULATION Tº C 1 WATER CALCULATION Tº C1 Type None The None option disables the circuit.  Variables table Default values and margins will be different than for space heating. Values used in those views are displayed in the fo- llowing table.

  • Page 200: Dhw

    6 LCD user’s interface 6.5.4 DHW Sanitary tank has its own configurable variables, displayed in the following table. CODE Description Default Value Range Steps Units Disabled 3-121 DHW status Disabled Enabled Standard usage 3-021 DHW Mode Standard usage High demand 3-022 DHW Tº set-point 30 ~ (3-122) * ºC DHW timer Anti-legionella This menu has different sub-menus that are: DHW timer: this is a programmable timer that allows banning the usage of DHW only on the assigned periods.
  • Page 201 6 LCD user’s interface  DHW timer When user selects configure value, another window will be displayed,as  seen in the following image. That screen will included the following options: DHW TIMERS DHW TIMERS Timer Creation Timer Creation Timer creation: this will be used to set the different programs. Timer Assignation Timer Assignation Reset Timer Creation Reset Timer Creation...

  • Page 202: Optional Functions

    6 LCD user’s interface  Anti-legionella User can only activate or deactivate the anti-legionella function. Code Description Default Value Range Steps Units Disabled 8-004 Disinfection function status Disabled Enabled This function will work If it is turned on. It will start at selected time and on the selected day (Operation interval) with the  selected temperature during the selected time. In the comprehensive view, the text “ANTL” will appear in the tank area. C A U T I O N Anti-legionella function is hidden to the user by default. Installer can display it.

  • Page 203: Installer Access

    6 LCD user’s interface 6.6 Installer access A special user with higher access privileges can use the controller to configure the system. This user is referred to as the Installer, and in order to access the controller as Installer, you must hold down the OK and Return buttons for 3 seconds. RETURN After that, the “Enter the password combination” message will appear. The password combination for the Installer is: Right ( ), Down ( ), Left (...

  • Page 204: Unit Configuration

    6 LCD user’s interface 6.6.1 Unit configuration  Operation display This menu is exactly the same than in user mode.  General parameters General parameters allow for the configuration of the general system variables. CODE Description Default Value Range Steps Units General Parameters Room Thermostat Options 1-001 OUa Refrigerant Cycle Address 0~63 1-002 IUa Indoor Unit Address...
  • Page 205 6 LCD user’s interface Area binding Binding is a necessary process in order to link the room thermostat with the wireless receiver and assign them to the co- rresponding circuit on the controller. Make sure the room thermostats are shut down before starting the binding process. They must be in the Off position. First, reset the wireless receiver by holding down the button for 15 BINDING CIRCUIT 1 seconds. This will erase the receiver’s current configuration. Next, prepare the wireless receiver to link it to the room thermostat  CANCEL START and unit. Press and hold the receiver button for 5 seconds. Next, select the circuit to be linked inside the binding zone. After ...

  • Page 206: System Configuration

    6 LCD user’s interface 6.6.2 System configuration  User privileges This will define what the user may or may not do. For example, the Installer can decide whether or not the user may switch  between different water calculation types, or whether or not the user may enable or disable the anti-legionella function. CODE Description Default Value Range Steps Units Water calculation privilege 3-999 Calculation Type Selection No / Yes 3-998...
  • Page 207 6 LCD user’s interface DHW Timer DHW Timer is the same as that displayed in user mode. Anti-legionella The user can only activate or de-activate it, while the Installer will have access to all configuration parameters. CODE Description Default Value Range Steps Units 8-003 OpInt Operation Day Sunday Daily / Mon ~ Sun 8-005 StTim Starting Time 01:00 (00~24) Time 8-006 DHWSP DHW Tº...

  • Page 208: Water Pump

    6 LCD user’s interface  Mixing valve for C2 The following table lists the settings that may be edited to control circuit 2’s mixing valve. CODE Description Default Value Range Steps Units 3-133 PBMV Proportional Band (K) 0~20  3-134 IRFMV Integral Reset Factor (%) 0.0~20 3-135...
  • Page 209 6 LCD user’s interface  Test Run When outdoor test run is selected, the remote control will ask for the duration of the test, and the working mode will be the same as that  explained in the normal user chapter, only with the Installer mode icon on the notifications bar.  Optional Function This will include the same parameters as those in user mode, with the addition of the following parameters. CODE Description Default Value Range Steps Units Seizure Protection Disabled 8-020 Hydraulic Separator Status Disabled...

  • Page 211: Optional Functions

    7 Optional functions O p t i o n a l f u n c t i o n s Index 7.1. Indoor unit ............................174 7.1.1. Floor screed drying function (circuits 1 & 2) .................... 174 7.1.2. Automatic summer switch-off ........................175 7.1.3.

  • Page 212: Indoor Unit

    7 Optional functions 7.1 Indoor unit Yutaki S unit has different optional functions designed to give the user better control over the facilities that the user can  apply. 7.1.1 Floor screed drying function (circuits 1 & 2) New air to water heat pump has a new special optional function used exclusively for the process of drying of newly applied screed on floor heating system. This process is based on EN1264 part 4. When the user activates the floor screed drying function, the water set point follows a predetermined schedule: Water outlet 1 Water set-point is kept constant at 25ºC (*)  for ...

  • Page 213: Automatic Summer Switch-Off

    7 Optional functions 7.1.2 Automatic summer switch-off At higher outside temperatures it doesn’t make sense to keep heating the building. The YUTAKI S system will switch the  heating off when the daily average outdoor temperature of the previous day rises above the Summer Switch-Off Activation Temperature. Variables used: CODE Description Default Value Range Steps Units 8-001 Auto Summer Switch-OFF Disable Disable/Enabled 8-102...

  • Page 214: Pump And Valve Seizure Protection

    7 Optional functions 7.1.3 Pump and valve seizure protection The pump/valve seizure protection function helps to prevent these components sticking during long periods of inactivity. Every week the components will run for a short period. Mixing valves are fully opened and then fully closed (time depends on runtime parameter) •  Diverting valves are switched on for 1 minute. •  Pumps are switched on for 1 minute CODE Description Default Value...

  • Page 215: Tariff Input (Electrical Tariff Input)

    7 Optional functions 7.1.5 Tariff input (electrical tariff input) This function can be used to block the heat pump. It allows an external tariff switch device to switch off the heat pump during peak electricity demand period. When the system is working in combination with Boiler, the boiler will be switched ON to provide the necessary heating. Tariff-switching device Tariff device CODE Description Default Value Range 8-008 Tariff function enabled/disabled Disabled Disabled / Enabled 00:Heat pump blocked when signal is closed. 01:Heat pump blocked when signal is open. 8-010 Tariff action (00~03)  02:DHW blocked when signal is closed. 03:DHW blocked when signal is open. Use boiler instead of heat pump 8-009 Disabled Disabled / Enabled...

  • Page 216: Electrical Heater Or Boiler Emergency Mode

    7 Optional functions 7.1.6 Electrical heater or boiler emergency mode To use the electrical heater or boiler in the event of outdoor unit failure, apply additional setting to IU setting •  DSW4-4:ON –> Heater/Boiler Emergency enabled ON •  DSW4-4:OFF –> Heater/Boiler Emergency disabled OFF ...

  • Page 217: Step Heater For 3-Phase Imbalance Option

    7 Optional functions 7.1.7 Step heater for 3-phase imbalance option Only applies when power source of indoor unit is 3-phase (3N 400V 50Hz). In order to prevent 3-phase imbalance by Heater Steps, this option will be used to switch all 3 steps at the same time. When user allows 1-step heater mode (DSW3-3 ON), heater can only operate in one step.

  • Page 218: Indoor External Output Signals

    7 Optional functions 7.1.10 Indoor external output signals The system has four output optional signals. Signals are programmed on the indoor unit’s PCB using the CN7b. The output connectors have four ports (CN7b) to configure four output options out of the eleven options the system has  Available ports The system has the following input and output ports. Indication Port Setting on the Indoor Unit’s PCB Remarks...

  • Page 219: Outdoor Units

    7 Optional functions 7.2 Outdoor units The system has the following output signals which are programmed in the PCB of the outdoor unit using connectors. The system has the following optional functions which are programmed in the PCB of the outdoor unit. 7.2.1 Available ports The system has the following input and output ports.
  • Page 220 7 Optional functions Specification of the components for a correct installation Component Manufacturer or specifications Remarks OMRON mini power relay model: MY1F or Auxiliary relay (X3) Voltage between relay terminals 12 Vdc - 75 mA equivalent Optional part PCC-1A (capable of connecting 3P connector cable Five wires with connectors as one set the JST XHP –3 connector) Wire (control) Voltage 12V DC...

  • Page 221: Configuration

    7 Optional functions 7.2.2 Configuration  Available optional signals HVRN2 and HRNME-AF units have the following signals that are described in the following table. These signals are set up through the PCB of the outdoor unit. •  Output signals Ind. Output signal Application Port...
  • Page 222 7 Optional functions Programming The optional signals are programmed through the PCB of the outdoor unit. Setting of the optional signals The optional signals of the outdoor unit are set up from the PCB of the outdoor unit and push switches PSW1, PSW2 and PSW3.

  • Page 223: Description Of Optional Output Signals

    7 Optional functions 7.2.3 Description of optional output signals  Operation signal (1)     T his 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 section Available ports. Note that the contact of auxiliary relay X3 is closed when an operation signal is issued. ...

  • Page 225: Commissioning

    8 Commissioning C o m m i s s i o n i n g Index 8.1. Preliminary check ..........................188 8.1.1. Checking the unit ............................. 188 8.1.2. Electrical checking ........................... 188 8.1.3. Hydraulic circuit checking ........................188 8.1.4. Checking the Refrigerant circuit ......................189 8.2. Commissioning procedure........................189 8.3.

  • Page 226: Preliminary Check

    Indoor and outdoor unit must be configured by the installer to get the prefect setting and the unit working. 8.1 Preliminary check 8.1.1 Checking the unit •  Check external appearance of the unit to look for any damage due to transportation or installation •  Does installation space carry out Hitachi installations (see Unit spaces in outdoor and indoor manual) 8.1.2 Electrical checking D A N G E R Do not operate the system until all the check points have been cleared: • Check to ensure that the electrical resistance is more than 1 MΩ, by measuring the resistance between ground and electrical parts terminal. If not, do not operate the system until the electrical leakage is found and repaired.

  • Page 227: Checking The Refrigerant Circuit

    When user activates screed function, the water set point follows a predetermined schedule: Š Water set point is kept constant at 25ºC for 3 days Š Water set-point is set to the maximum Heating supply temperature (but always limited to ≤ 55ºC) for 4 days. D A N G E R Heating at lower water temperatures (approximately 10ºC to 15ºC) and lower outdoor ambient temperatures (<10ºC) can be damaging to the heat pump when defrosting. As a result, Heating up to 15ºC when outdoor temperature is lower than 10ºC. is performed by the Electrical Hea- ter. N O T E In case of Heater Forced OFF (by optional dip switch setting) these condition is not performed and heating is performed by Heat Pump. HITACHI is not responsible for its operation. C A U T I O N It is recommended start the unit (first power ON) with heater forced OFF (DSW4-7: ON). In order to circulate water by water pump and remove possible air into the heater (Check heater completely filled). SMGB0070 rev. 1 - 08/2011...

  • Page 228: Indoor Unit Test Run

    8 Commissioning 8.3 Indoor unit test run This option is not available on the menu. User may execute test run function by pressing the OK and Down arrow keys for 3  TEST RUN seconds. Configuration for outdoor unit test run After that combination, the remote control will ask about the  Duration: duration of this test. Note that test run mode will be the same than unit mode selec- CANCEL START ted on the global view.

  • Page 229: Outdoor Unit Test Run

    8 Commissioning 8.4 Outdoor unit test run The test run procedure from the outdoor unit side is shown below. You can set this DIP switch while the power source is  Setting of dip switch (before shipment) DSW1 Cooling: Pin 1 ON Heating: Pin 1, 2 ON Cooling intermediate season: Pin 1, 3 ON Heating intermediate season: Pin 1, 2, 3 ON...

  • Page 231: Electrical Checks Of The Main Parts

    9  Electrical checks of  the main parts E l e c t r i c a l   c h e c k s   o f   t h e   m a i n   p a r t s Index 9.1.

  • Page 232: Inverter

    9  Electrical checks of  the main parts 9.1 Inverter 9.1.1 Specifications of inverter Aplicable model RAS-2HVRN2 RAS-(3-6)HVRNME-AF RAS-(4-10)HRNME-AF RAS-(4-6)HRNME-AF (3N~ 400V+10% 50Hz) Aplicable power source 1~ 230V+10% 50Hz RAS-(8-10)HRNME (3N~ 380-415V+10% 50Hz) Input current 10.5A RAS-(3-6)HVRNME-AF: 15-30A RAS-(4-10)HRNME-AF: 6-25A Control method Vector control Range output frequency 31-115Hz 20-115HZ Accuracy of frequency 0,01 Hz at applicable frequency range...
  • Page 233 9  Electrical checks of  the main parts Protection function RAS-2HVRN2 RAS-(3-6)HVRNME-AF RAS-(4-10)HRNME-AF Detecting current is more than 150% of the rated current. Rated Rated current Current x 150% x 150% Rated current x 150% Rated Rated current Rated current Current x 105% x 105% x 105% Overcurrent protection for Time...

  • Page 234: Inverter Time Chart

    9  Electrical checks of  the main parts 9.1.2 Inverter time chart Main circuit power source Frequency Frequency All bit 1 All bit 1 operation HIGH Frequency instruction Output voltage Soft start-stop (frequency) The changing speed dependes on the outer setting Failure signal Output Activation of protection device Transmit error...

  • Page 235: Protective Function

    9  Electrical checks of  the main parts 9.1.3 Protective function 1 Excessive high or low voltage for inverter a. Level of detection Š When the voltage of direct current is greater than (A) V, abnormalities are detected. Š When the voltage of direct current is smaller than (B) V, abnormalities are detected. Power supply 400V, 50Hz / 380-415V, 50Hz 230V, 50Hz...

  • Page 236: Overload Control

    9  Electrical checks of  the main parts 4 Protection of IPM/DIP-IPM/ISPM a. Level of detection When some of the output terminals between “U” and “V”, “V” and “W”, “W” and “U” of IPM/dip IPM/ISPM are short- circuited, an abnormality is detected. When the running current of IPM/DIP-IPM/ISPM reaches (maximum rated current x 105%), an abnormality is de- tected.

  • Page 237: Thermistor

    9  Electrical checks of  the main parts 9.2 Thermistor Thermistors for the outdoor unit Thermistor for outdoor ambient temperature (THM7) Thermistor for dis- charge gas tempe- rature (THM9) Thermistor for evaporating tempe- rature (THM8) Thermistors for the indoor unit Thermistor for water outlet PHEX temperature (THM WOHP Thermistor for refrigerant gas...
  • Page 238 9  Electrical checks of  the main parts  Thermistor for upper part temperature of compressor (For prevention of discharge gas overheating) a. A thermistor for the upper part temperature of the compressor is installed to prevent discharge gas from overhea- ting. If discharge gas temperature increases excessively lubricating oil deterioration occurs and lubricating properties deteriorate, resulting in short compressor life.
  • Page 239 9  Electrical checks of  the main parts  Thermistor for outdoor ambient temperature The thermistor resistance characteristics are shown in the next figure. Thermistor characteristics Thermistor resis- tance (KΩ) -15 -10 -5 10 15 20 25 30 35 40 45 50 55 60 Ambient temperature (ºC)  Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting) Thermistor characteristics Thermistor resis- tance (KΩ)

  • Page 240: Electronic Expansion Valve

    9  Electrical checks of  the main parts 9.3 Electronic expansion valve 9.3.1 Electronic expansion valve for the outdoor unit Micro-computer Pulse motor Pulse signal 2-Phase permanent magnetic pulse motor Control 0 to 500 pulse by 1 pulse Refrigerant flow control Needle Precise control Items Specifications Applicable to the models For the main cycle of: RAS-(4-10)H(V)RNM(E) Type...

  • Page 241: Electronic Expansion Valve For The Indoor Unit

    9  Electrical checks of  the main parts 9.3.2 Electronic expansion valve for the indoor unit Micro-computer Pulse motor Pulse Motor Pulse signal 2-Phase permanent magnetic pulse motor Gear Gear Control 0 to 2000 pulse by 1 pulse Output shaft Output Shaft Lock nut Lock Nut Bellows Bellows Refrigerant flow control...

  • Page 242: High Pressure Protection Device

    9  Electrical checks of  the main parts 9.4 High pressure protection device If the discharge pressure is excessively high, the compressor and the component parts of the refrigeration cycle can be damaged. Therefore, in case that the discharge pressure is higher than 4.15MPa (R410A), the protection control is acti- vated and the compressor is stopped.

  • Page 243: Noise Filter (Nf)

    9  Electrical checks of  the main parts 9.5 Noise filter (NF) 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. 9.5.1 Noise filter for 1~ RAS-(3-6)HVRNME-AF (230V 50Hz) Items Specifications Model LFB-14930-3M Rated current AC230V 30 A Permissible temperature range.

  • Page 244: Noise Filter For 3N

    9  Electrical checks of  the main parts 9.5.2 Noise filter for 3N~ RAS-(4-10)HRNME-AF (400V 50Hz) Items Specifications Model 4LFB-16830-2FA Rated current AC415V 27A Permissible temperature range -25ºC to 85ºC Circuit diagram HRNM(E) 9.6 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.

  • Page 245: Reactor (Dcl)

    9  Electrical checks of  the main parts 9.7 Reactor (DCL) This part is used for changing the alternative current to the direct current for the inverter. 9.7.1 Reactor (DCL) for 1~ RAS-(3-6)HVRNME-AF (230V 50Hz) Items Specifications Character 0.59 mH±15 (at 1 kHz) Rated current 30 A DC Resistance 26 mΩ (at 20 °C) Permissible temperature range -20ºC to 60ºC...

  • Page 246: Scroll Compressor

    9  Electrical checks of  the main parts 9.8 Scroll compressor  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. ...

  • Page 247: Spare Parts

    10 Spare parts 1 0 . S p a r e p a r t s Index 10.1. Outdoor units ............................210 10.1.1. RAS-2HVRN2 ............................210 10.1.2. RAS-3HVRNME-AF ..........................212 10.1.3. RAS-(4-6)HVRNME-AF ........................... 215 10.1.4. RAS-(4-6)HRNME-AF ..........................218 10.1.5. RAS-(8/10)HRNME-AF ..........................221 10.2.

  • Page 248: Outdoor Units

    10 Spare parts 10.1 Outdoor units 10.1.1 RAS-2HVRN2  Cycle, structural and electrical parts U34B U15C U15A U32B U21B U21A U01A U01B U15B U32A U34A U27B U27A Spare Parts Document: EPN-200702 SMGB0070 rev.1 - 08/2011...
  • Page 249 10 Spare parts Part name Remarks U01A Pressure SW High pressure U01B Pressure SW For control U15A Thermistor TA (Ambient) U15B Thermistor TE (Evaporation) U15C Thermistor TD (Discharge) U21A Expansion valve — U21B Coil for expansion valve — U27A Stop valve Gas line U27B Stop valve...

  • Page 250: Ras-3Hvrnme-Af

    10 Spare parts 10.1.2 RAS-3HVRNME-AF  Cycle and structural parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...

  • Page 251: Electrical Parts

    10 Spare parts  Electrical parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...
  • Page 252 10 Spare parts Cycle and structural parts Electrical parts Part name Remarks Part name Remarks U00A Terminal board U71A Fan motor U00B THM support D MG SW U01A Pressure SW Protection Oil heater U01B Pressure SW Control 4 way valve Fuse Coil for 4 way valve U15A...

  • Page 253: Ras-(4-6)Hvrnme-Af

    10 Spare parts 10.1.3 RAS-(4-6)HVRNME-AF  Cycle and structural parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...
  • Page 254 10 Spare parts  Electrical parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...
  • Page 255 10 Spare parts Cycle and structural parts Electrical parts Part name Remarks Part name Remarks Compressor U00A Terminal board U01A Pressure SW Protection U71A Fan motor U01B Pressure Sw Control U71B Fan motor Fuse 40A, 5/6 HP 50A MG SW U15A Thermistor U77A...

  • Page 256: Ras-(4-6)Hrnme-Af

    10 Spare parts 10.1.4 RAS-(4-6)HRNME-AF  Cycle and structural parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...
  • Page 257 10 Spare parts  Electrical parts Spare Parts Document: EPN-201005 SMGB0070 rev.1 - 08/2011...
  • Page 258 10 Spare parts Cycle and structural parts Electrical parts Part name Remarks Part name Remarks Compressor U00A Terminal board U71A Fan motor U01A Pressure SW Protection U71B Fan motor U01B Pressure Sw Control MG SW Fuse U74A Resistor Capacitor 2700µf U74B Resistor U15A...

  • Page 259: Ras-(8/10)Hrnme-Af

    10 Spare parts LOCATION OF SPARE PARTS IN THE UNIT MODEL: RAS-8HRNM 10.1.5 RAS-(8/10)HRNME-AF LOCATION OF SPARE PARTS IN THE UNIT RAS-10HRNM MODEL: RAS-8HRNM RAS-12HRNM  Cycle and structural parts RAS-10HRNM RAS-12HRNM U77B U77E U77B U77E U30D U30D U01B U01B U01A U40A U01A...
  • Page 260 U14A ELECTRICAL EQ 10 Spare parts <3φ 380-415V/50Hz,  Electrical parts U65D ELECTRICAL EQUIPMENT ELECTRICAL EQUIPMENT MODEL: RAS-8HRNM MODEL: RAS-8HRNM RAS-10HRNM RAS-10HRNM RAS-12HRNM RAS-12HRNM U85A <3φ 380-415V/50Hz, 3 φ 380V/60Hz> <3φ 380-415V/50Hz, 3 φ 380V/60Hz> U15D U74A U74A View from Q View from P View from P U65C...
  • Page 261 10 Spare parts Cycle and structural parts Part name Remarks Part name Remarks U01A Pressure Sw High pressure U65B Plastic material U01B Pressure Sw For control U65C Plastic material U01C Pressure Sw Low pressure U65D Plastic material Fuse 40A - 60A Compressor U14A Capacitor...

  • Page 262: Indoor Units

    10 Spare parts 10.2 Indoor units  Cycle and structural parts RWM-(2.0-6.0)FSN3E 11 (2x) 12 (1x) PUMP AND HEATER CONNECTIONS (2x) 7-10 EXP VESSEL CONNECTION 13-2 SIDE VIEW 13-1 Spare Part Document: EPN-201010 SMGB0070 rev.1 - 08/2011...
  • Page 263 RWM-(8/10)FSN3E 11 (2x) 12 (1x) PUMP AND HEATER CONNECTIONS (2x) 7-10 EXP VESSEL CONNECTION 13-2 SIDE VIEW 13-1 Spare Part Document: EPN-201010...
  • Page 264 10 Spare parts  Electrical parts RWM-(2.0-6.0)FSN3E PCB1 PCN8 PCN7 PCN6 Y20A Y20B Y52CS Y52C Y20L LED1 LED2 LED3 LED4 R113 LED6 SEG1 SEG2 RSW1 RSW2 R110 LED5 RSW3 RSW4 SEG3 SEG4 SEG5 R107 PSW2 PSW1 DSW2 DSW3 DSW4 DSW1 DSW5 LED8 REG3...
  • Page 265 10 Spare parts RWM-(8/10)FSN3E PCB1 PCN8 PCN7 PCN6 Y20A Y20B Y52CS Y52C Y20L LED1 LED2 LED3 LED4 LED6 R113 SEG1 SEG2 RSW1 RSW2 R110 LED5 RSW3 RSW4 SEG3 SEG4 SEG5 R107 PSW2 PSW1 DSW2 DSW3 DSW4 DSW1 DSW5 LED8 REG3 REG2 REG1 PC10...
  • Page 266 10 Spare parts Cycle and structural parts Description Remarks Description Remarks Screw For cover assy fixing Electric Heater Assy Gaskets 11 not included For cover assy fixing  Air Purge Nylon washer (material: nylon) Security Valve For cover assy fixing  Washer RWM-(2.0-6.0)FSN3E: 6L (material: steel) Expansion Vessel RWM-(8.0/10.0): 10L Shutdown valve Gasket 12 not included (1-1/4") Gaskets 11 and pump insulation ...

  • Page 267: Servicing

    11 Servicing 11 . S e r v i c i n g Index 11.1. Outdoor unit............................230 11.1.1. RAS-2HVRN2 ............................230 11.1.2. RAS-3HVRNME-AF ..........................237 11.1.3. RAS-(4-6)H(V)RNME-AF ......................... 248 11.1.4. RAS-(8/10)HRNME-AF ..........................264 11.2. Indoor unit ............................280 11.2.1. Removing service cover .......................... 280 11.2.2.

  • Page 268: Outdoor Unit

    11 Servicing 11.1 Outdoor unit 11.1.1 RAS-2HVRN2  Removing pipe cover Follow the procedure below to remove main parts and com- ponents. For mounting follow the reverse procedure of re- moval. Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle.
  • Page 269 11 Servicing  Removing outdoor fan Remove the pipe cover following Removing pipe cover, see on page 258. Remove three (3) fixing screws and remove the upper co- ver. Remove the front cover following Removing front cover, see on page 258. To remove the propeller fan remove the cap nut which fixes  the propeller fan onto the motor shaft. Part Cap nut Propeller fan...

  • Page 270: Removing The Compressor

    11 Servicing  Removing the compressor N O T E • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust into the cycle. Be sure to replace the compressor immediately after removing. Seal to the suction and discharge pipes when the refrigerant cycle is left unattached for a prolonged time. • Remove the cap of new compressor right before the replacement. Before mounting the compressor seal the suction and discharge pipes with a tape to protect the compressor from dust. Remove the tape at pipe con- nection. • To connect wiring at reassembling ensure that the compressor terminal numbers and wiring mark band codes are matched. Incorrect wiring numbers may result in inverse rotation and damage the compressor. Remove the pipe cover following Removing pipe cover, see on page 395. When the outdoor unit is installed close to a wall move the unit from the wall removing the refrigerant piping.
  • Page 271 11 Servicing 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). Check if the Faston terminal has any abnormality when re- placing the compressor. (Ensure the pull out force greater than 20 N). If the Faston terminal is identified faulty replace  to a new one. Ensure the fixture of the lead wires.  Part Compressor Accumulator Push nut Vibration-proof rubber Two push nut Three vibration-proof rubber Accumulator ...

  • Page 272: Removing Electronic Expansion Valve Coil

    11 Servicing  Removing four-way valve coil Remove the pipe cover following Removing pipe cover, see on page 395. Remove three (3) fixing screws and remove the upper cover. Remove the front cover following Removing front cover, see on page 395. Remove the electrical box cover. Disconnect the PCN6 connector on the control PCB of the electrical box.

  • Page 273: Troubleshooting

    11 Servicing  Removing electrical components Removing Electrical Box Remove the pipe cover following Removing pipe cover, see on page 395. Remove three (3) fixing screws and remove the upper co- ver. Remove the electrical box cover. Remove one (1) fixing screw and remove the terminal co- ver. Disconnect all the wiring connected to the control PCB. Remove two (2) screws which fix the electrical box. Pull up and remove the electrical box.
  • Page 274 11 Servicing Removing other electrical components Remove the pipe cover following Removing pipe cover, see on page 395. Remove three (3) fixing screws and remove the upper co- ver. Remove the electrical box cover. Removing Electrical Components. Remove the fixing screw and remove the reactor. To mount components be sure to match the wiring connec- tion with the mark band codes. Part Electrical box cover Partition plate...

  • Page 275: Ras-3Hvrnme-Af

    11 Servicing 11.1.2 RAS-3HVRNME-AF  Removing service cover Part Screws Remove the main parts according to the following proce- dures: Remove the five (5) fixing screws. Slide the service cover downward and remove it. Pay attention of not falling off the service cover. N O T E • To reassemble perform the procedures in reverse.
  • Page 276 11 Servicing  Removing outdoor fan motor Part Upper cover Remove the service cover according to the section Remo- in this chapter. ving service cover Remove the air outlet grille according to the section Remo- ving air outlet grille in this chapter. Remove the upper cover according to the section Remo- ving upper cover...
  • Page 277 11 Servicing  Removing the compressor Part Upper cover Rear panel Check joint Rear pipe cover Valve stay Remove the service cover and the lower part of the service panel according to the section Removing service cover the section Removing lower part of service panel and rear panel.
  • Page 278 11 Servicing Part Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Compressor Part Indication of terminal number Terminal box cover Compressor wires Details for compressor terminals Part Compressor wires (3 wires) Fix it with screw N O T E • The compressor is connected by brazing. Check to ensure whether there are flammable things around or not when using a burner for pipe connections. If you do not´, oil existing pipe inside may ignite.
  • Page 279 11 Servicing Remove the suction pipe and the discharge pipe from the compressor. Isolate the wires and electrical components to protect them from the burner flame when brazing the con- nection pipes. Part Cover pipes with wet cloth Suction pipe Discharge pipe Remove the two (2) nuts fixing the compressor and remove  the compressor from the unit by lifting it. Slightly incline it forward and lift.
  • Page 280 11 Servicing  Opening electrical box (P-mounting plate) Remove the service cover according to the section Remo- ving the service cover in this chapter. Remove  the  six  (6)  screws  fixing  the  electrical  box.  Open  the P-mounting plate by rotating it to the left. Part 2 Screws P-Mounting plate...
  • Page 281 11 Servicing  Removing reversing valve coil Remove the service cover according to the section Remo- ving service cover in this chapter. Open the P-mounting plate according to the section Ope- ning electrical box (P-Mounting Plate) in this chapter. D A N G E R • Check that the LED201 (red) located on the “W”...

  • Page 282: Removing Reversing Valve

    11 Servicing  Removing reversing valve Remove the service cover and the rear service panel accor- ding to the section Removing Service Cover and the section Removing lower part of service panel and rear service pa- in this chapter. Collect the refrigerant from the check joint according to the  section Removing compressor.
  • Page 283 11 Servicing  Removing expansion valve Remove the service cover and rear service panel accor- ding to the section Removing Service Cover and the section Removing Lower Part of Service Panel and Rear Service Panel. Collect the refrigerant from the check joint according to the  section Removing Compressor. Remove the coils according to the section Removing Elec- tronic Expansion Valve Coil.

  • Page 284: Removing Electrical Components

    11 Servicing  Removing electrical components D A N G E R • Do not touch the electrical components of the PCB directly. • When handling the PCB, take care of components. Do not apply excesive force to them, in order to avoid da- maging the motherboard and failures. Remove the service cover according to section Removing service cover in this chapter. •  Disconnect all the connectors in the PCB. •  Remove the PCB by sliding four (4) holders in the arrow direction.
  • Page 285 11 Servicing  Removing “W” electrical components surface Remove the service cover according to the section Removing service cover in this chapter. Open the P-mounting plate by rotating 90 degrees to the left according to the section Opening electrical box (P-Mounting in this chapter.

  • Page 286: Ras-(4-6)H(V)Rnme-Af

    11 Servicing 11.1.3 RAS-(4-6)H(V)RNME-AF  Removing service cover Remove the main parts according to the following proce- dures. N O T E • To reassemble perform the procedures in reverse. • To prevent contamination of the refrigerant with wa- ter or foreign particles, do not expose open to atmo- sphere for long periods. • If necessary, seal pipe ends using caps or tape. Remove the four (4) fixing screws. Slide the service cover downward and remove it. Pay attention of not falling off the service cover. Part Service cover Screws...
  • Page 287 11 Servicing  Removing upper cover Remove all the screws fixing the upper cover, both on the  front and back of the machine. Lift the upper cover upwards. Part Upper cover Screws  Removing the lower part of service panel and rear panel Remove  the  five  (5)  fixing  screws  at  the  lower  part  of  the  service panel and remove the lower part of the service pa- nel by pulling towards the front side.
  • Page 288 11 Servicing Removing outdoor fan motor Remove the service cover according to the section Remo- ving service cover in this chapter. Remove the air outlet grille according to the section Remo- ving air outlet grille in this chapter. Remove the upper cover according to the section Remo- ving upper cover in this chapter.
  • Page 289 11 Servicing Remove the fan motor connector from the PCN202 and PCN203 at the electrical box. •  Cut  off  the  cable  tie  that  fixes  the  lead  wire  of  the  fan  motor. •  Remove the four (4) screws that fix the motor to the mo- tor clamp. Fix the motor wire with the cable tie or the cord clamp. If not, it may cause the disconnection of the fan motor’s lead wire.
  • Page 290 11 Servicing  Removing the compressor Remove the service cover and the lower part of the service panel according to the section Removing service cover the section Removing lower part of service panel and rear panel. In case that the outdoor unit is installed close to a wall closely, sepparate first the outdoor unit from the wall.
  • Page 291 11 Servicing Part Indication of terminal number Terminal box cover Compressor wires Details for compressor terminals Part Compressor wires (3 wires) Fix it with screw N O T E • The compressor is connected by brazing. Check to ensure whether there are flammable things around or not when using a burner for pipe connections. If you do not´, oil existing pipe inside may ignite. • Do not expose the refrigerant cycle to the atmosphere for a long period in order to avoid water and foreign particles entering into the refrigerant cycle. After removing the compressor, replace it quickly. If it is exposed to the ambiance for a long period, seal both suction and discharge pipes. • Remove the cap for the compressor just before replacing the compressor. Before assembling the compressor, seal the suction pipe and discharge pipe with tape to protect the compressor interior from foreign particles. Remove the tape when connecting the pipes. • Match the terminal No. with the mark band No. when reassembling. If the wiring is connected incorrectly, the compressor may be damaged due to reverse rotation.
  • Page 292 11 Servicing Remove the suction pipe and the discharge pipe from the compressor. Isolate the wires and electrical components to protect them from the burner flame when brazing the con- nection pipes. Part Suction pipe Discharge pipe Remove the two (2) nuts fixing the compressor and remove  the compressor from the unit by lifting it. Slightly incline it forward and lift.
  • Page 293 11 Servicing  Removing high pressure switch and control pressure switch Remove the service cover according to the section Remo- ving service cover in this chapter. Collect the refrigerant from the check joint according to the  section Removing the compressor in this chapter. Disconnect the fasten terminals from the pressure switches. • ...
  • Page 294 11 Servicing  Opening electrical box (P-mounting plate) Remove the service cover according to the section Remo- ving the service cover in this chapter. Remove  the  six  (6)  screws  fixing  the  electrical  box.  Open  the P-mounting plate by rotating it 90 degrees to the left. Part 2 Screws P-Mounting plate...
  • Page 295 11 Servicing  Removing the coils for the reversing and solenoid valves (SVA1, SVA2 and SVF) Remove the service cover according to the section Remo- ving service cover in this chapter. Open the P-mounting plate according to the section Ope- ning electrical box (P-Mounting Plate) in this chapter.
  • Page 296 11 Servicing  Removing expansion valve coil Remove the service cover according to the section Remo- ving service cover. Open the P-mounting plate according to the section Ope- ning electrical box (P-Mounting Plate) in this chapter. D A N G E R • Check that the LED201 (red) located on the “W”...
  • Page 297 11 Servicing Removing reversing valve Remove the service cover and the rear service panel accor- ding to the section Removing Service Cover and the section Removing lower part of service panel and rear service pa- in this chapter. Collect the refrigerant from the check joint according to the  section Removing compressor.
  • Page 298 11 Servicing  Removing expansion valve Remove the service cover and rear service panel accor- ding to the section Removing Service Cover and the section Removing Lower Part of Service Panel and Rear Service Panel. Collect the refrigerant from the check joint according to the  section Removing Compressor. Remove the coils according to the section Removing Elec- tronic Expansion Valve Coil.
  • Page 299 11 Servicing  Removing electrical components D A N G E R • Do not touch the electrical components of the PCB directly. • When handling the PCB, take care of components. Do not apply excesive force to them, in order to avoid da- maging the motherboard and failures Remove the service cover according to section Removing service cover in this chapter. •  Disconnect all the connectors in the PCB. •  Remove the PCB by sliding four (4) holders in the arrow direction.
  • Page 300 11 Servicing  Removing “W” electrical components surface Remove the service cover according to the section Remo- RAS-(4-6)HRNME-AF ving service cover in this chapter. Open the P-mounting plate by rotating 90 degrees to the left according to the section Opening electrical box (P-Mounting Plate) in this chapter.
  • Page 301 11 Servicing Removing other electrical components Remove the service cover according to the section Removing service cover in this chapter. Open the P-mounting plate by rotating it 90 degrees to the left according to the section Opening electrical box (P-Mounting Plate) in this chapter.

  • Page 302: Ras-(8/10)Hrnme-Af

    11 Servicing 11.1.4 RAS-(8/10)HRNME-AF  Removing service cover Remove the main parts according to the following proce- dures. N O T E • To reassemble perform the procedures in reverse. • To prevent contamination of the refrigerant with water or foreign particles, do not expose open to at- mosphere for long periods. • If necessary, seal pipe ends using caps or tape. Remove the four (4) fixing screws. Slide the service cover downward and remove it. Pay attention of not falling off the service cover.
  • Page 303 11 Servicing  Removing the lower part of service panel and rear panel Remove  the  five  (5)  fixing  screws  at  the  lower  part  of  the  service panel and remove the lower part of the service pa- nel by pulling towards the front side. Remove the upper cover according to section Removing upper cover in this...
  • Page 304 11 Servicing Fan components and technical features Power supply 3N~ 380-415V 50Hz PCB5 DC fan motor PCN203 Fan motor comp.No. CN201 PCB3 AC fan motor PCN404 (White) DC Fan Motor M6 Screw with spacer x 4 Screw for motor fixing AC Fan Motor M8 Screw x 4 Part Motor clamp...
  • Page 305 11 Servicing  Removing the compressor Remove the service cover and the lower part of the service panel according to the section Removing service cover the section Removing lower part of service panel and rear panel. In case that the outdoor unit is installed close to a wall closely, sepparate first the outdoor unit from the wall.
  • Page 306 11 Servicing Part Thermistor holder Holder Td Thermistor Thermistor fixing plate Rubber cap Th Thermistor Compressor Part Indication of terminal number Terminal box cover Compressor wires Part Details for compressor terminals Compressor wires (3 wires) Fix it with screw N O T E • The compressor is connected by brazing. Check to ensure whether there are flammable things around or not when using a burner for pipe connections. If you do not´, oil existing pipe inside may ignite.
  • Page 307 11 Servicing Remove the suction pipe and the discharge pipe from the compressor. Isolate the wires and electrical components to protect them from the burner flame when brazing the con- nection pipes. Part Suction pipe Discharge pipe Remove the two (2) nuts fixing the compressor and remove  the compressor from the unit by lifting it. Slightly incline it Cover pipes with wet cloth forward and lift.

  • Page 308: Pressure Switch

    11 Servicing  Removing high pressure switch and control pressure switch Remove the service cover according to the section Remo- ving service cover in this chapter. Collect the refrigerant from the check joint according to the  section Removing the compressor in this chapter. Disconnect the fasten terminals from the pressure switches. • ...
  • Page 309 11 Servicing  Removing the coils for the reversing and solenoid valves (SVA1, SVA2 and SVF) Remove the service cover according to the section Remo- ving service cover in this chapter. Open the P-mounting plate according to the section Ope- ning electrical box (P-Mounting Plate) in this chapter.
  • Page 310 11 Servicing  Removing expansion valve coil Remove the service cover according to the section Remo- ving service cover. Open the P-mounting plate according to the section Ope- ning electrical box (P-Mounting Plate) in this chapter. D A N G E R • Check that the LED201 (red) located on the “W”...
  • Page 311 11 Servicing  Removing reversing valve Remove the service cover and the rear service panel accor- ding to the section Removing Service Cover and the section Removing lower part of service panel and rear service pa- in this chapter. Collect the refrigerant from the check joint according to the  section Removing compressor.
  • Page 312 11 Servicing  Removing expansion valve Remove the service cover and rear service panel accor- ding to the section Removing Service Cover and the section Removing Lower Part of Service Panel and Rear Service Panel. Collect the refrigerant from the check joint according to the  section Removing Compressor. Remove the coils according to the section Removing Elec- tronic Expansion Valve Coil.
  • Page 313 11 Servicing  Removing solenoid valve Remove the service cover and the rear service panel according to the sections Removing Service Cover Removing lower part of service panel and rear panel, described in this chapter . Collect the refrigerant from the check joint according to the section Removing compressor in this chapter. Remove the solenoid valve coil according to the section Removing coils for reversing valve and solenoid valve (SVA1, SVA2 and SVF)
  • Page 314 11 Servicing  Removing electrical components D A N G E R • Do not touch the electrical components. • When handling the PCB1, take care not to use excessive force to avoid damage. Remove the service cover according to section Removing 3N~ 380-415V 50Hz service cover in this chapter. Disconnect all the connectors in the PCB. Remove the PCB by sliding four (4) holders in the arrow direction.
  • Page 315 11 Servicing  Removing inverter components D A N G E R • Do not touch the electrical parts when LED201 (Red) on the PCB2 is lit to prevent from an electrical shock. • When replacing the transistor module (IPM) and diode module (DM) on heat radiation fin, slightly apply the heat conducting silicon grease (Manufacture: Shin-Etsu Chemical Co., Ltd, Product No.: G-746) over the fin contact surface. • Identify the terminal numbers with mark band. When reassembling, the terminals have to be connected to the correct numbers . If incorrectly connected, malfunctions or damages will occur. • Correctly insert two wires of U and V phases for the power cable of inverter compressor into the current sen- sor, CTU and CTV on PCB2. Connect Phase U power cable with the current sensor Phase U (CTU) and Phase V power line with current sensor Phase V (CTV). If connected incorrectly, malfunction or electrical component...
  • Page 316 11 Servicing Removing diode module and transistor module D A N G E R Do NOT touch the electrical components when the LED201 (Red) on PCB2 is ON to avoid electrical shock. Check to ensure that the LED201 (Red) of the PCB2 is off. Disconnect all the wirings connected to the diode module as Diode module shown in the figure: Disconnect the wirings of the terminals +, - , U, V, W on the diode module.
  • Page 317 11 Servicing  Removing other electrical components D A N G E R Do NOT touch the electrical components when the LED201 (Red) on PCB2 is ON to avoid electrical shock. Remove the service cover according to the section Removing service cover in this chapter. Open the P-mounting plate by rotating it 90 degrees to the left according to the section Opening electrical box (P-Mounting Plate) in this chapter.

  • Page 318: Indoor Unit

    11 Servicing 11.2 Indoor unit C A U T I O N •  Before performing any of the service operations described in this chapter, turn all the main switches off and place se- curity lockers or convenient warning indicators in order to prevent them from turning on accidentally. •  In case of blocked or sticked parts, use appropriated 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 a must to wear convenient eye protection. 11.2.1 Removing service cover 1 First, open the user’s interface service cover.

  • Page 319: Replacing Electrical Components

    11 Servicing 11.2.2 Replacing electrical components D A N G E R • Disconnect the Yutaki S from the power supply before touching any of the parts. Do not touch the electrical box before disconnecting it in order to avoid an electrical shock. • When handling the electrical box, take care of components. Do not apply excessive force to them, in order to avoid damaging the electrical components.  Removing electrical box components 1 Remove electrical box cover, for accessing to the elec- trical components (x4 screws). Electrical box components Item Part name Remarks...
  • Page 320 11 Servicing Step 2b (Indoor unit devices 2) Š Water flow switch wire (CN25) Š Water pressure switch wire (CN24) Š Electrical heater thermal fuse wire (CN23) Š Electrical heater surface thermostat wire (THe) Š Water pump wire (CN23) Step 2c (Indoor unit sensors) Š...
  • Page 321 11 Servicing Step 3c (Remove hinges screws) Š Remove x6 hinges screws on the right side of electrical box. * N O T E * Pay attention to avoid Electrical box falling down when removing screws. 3 Assembly new electrical box by perform the procedure above in reverse way.
  • Page 322 11 Servicing 7 Install new thermistor using P-Spring and Butyl Sheet as shown in the following drawing: Replacing water thermistor Replacing water thermistor Refrigerant pipe Liquid/Gas thermistor P-Sprint Water Water piping Refrigerant Pipe thermistor pipe Liquid/Gas piping thermistor WOHP Butyl B u t y l Butyl sheet...
  • Page 323 11 Servicing  Replace electrical heater safety surface thermostat (THe) N O T E To disconnect this component properly from the Electrical box, see the chapter of this Electrical wiring diagram manual. 1 Remove service cover. 2 Disconnect the safety thermostat (THe) by pulling upwards the faston connections.

  • Page 324: Replacing Hydraulic Components

    11 Servicing 11.2.3 Replacing hydraulic components D A N G E R • Disconnect the Yutaki S from the power supply before touching any of the parts. Do not touch the electrical box before disconnecting it in order to avoid an electrical shock. • Wait minimum 10 minutes or more from all power supplies have been turned OFF. • In case of replacing Hydraulic parts, drain water from the unit its needed. Close Shutdown valves and open the drain valves.  Replace water flow switch (WFS) N O T E To disconnect this component properly from the Electrical box, see the Electrical wiring diagram chapter of this manual. 1 Remove service cover. 2 Remove the electrical box cover. 3 Disconnect the water flow switch (WTS) from electrical ...
  • Page 325 11 Servicing  Replace low water pressure switch (LWPS) N O T E To disconnect this component properly from the Electrical box, see the chapter of this Electrical wiring diagram manual. 1 Remove service cover. 2 Disconnect the low water pressure switch (LWPS by pu- lling upwards the faston connections.
  • Page 326 11 Servicing  Replace water pump (WP1) N O T E To disconnect this component properly from the electrical box, see the chapter of this Electrical wiring diagram manual. 1 Remove service cover. 2 Disconnect the water pump 1 by CN22 connector. 3 Unscrew the both water piping nuts that fixing the water ...
  • Page 327 11 Servicing 4 Unscrew manometer capillary joint from the water pipe. 5 Press two rings of the manometer rear side and remove it passing the capillary through the hole of the LCD con- troller support. 6 Install the new one by performing the procedures above in reverse way. N O T E Be sure of the position of the manometer.
  • Page 328 11 Servicing 4 Unscrew union pipe from safety valve. Union 5 Install the new one by performing the procedures above Safety pipe valve in reverse way. N O T E Final location of the draining hole must be into the indicated angle area (90º) • Be sure of the position of the safety valve.
  • Page 329 11 Servicing 4 Unscrew fitting of air purger. Final location of the draining hole must 5 Install the new one by performing the procedures above be into the indicated angle area (90º) in reverse way. Drain hose N O T E Be sure of the position of the air purge: Air purge ...
  • Page 330 11 Servicing 6 Unscrew safety valve as shown in section Replace safe- valve. 7 Unscrew air purger shown in section Replace air purger. 8 Unscrew the four screws fixing the electrical heater. 9 Install the new one by performing the procedures above in reverse way. N O T E • Check safety valve notes when disassembling/assembling.
  • Page 331 11 Servicing •  In case of replacing water strainer entire. 1 Remove service cover. 2 Remove insulation of water strainer pipes. 3 Remove brazing from the two places, and then remove water strainer. Brazing  Replace expansion vessel 1 Remove service cover. 2 Remover electrical box cover.

  • Page 332: Replacing Refrigerant Parts

    11 Servicing 7 Install new one by performing the procedures above in Expansion vessel connection reverse way. N O T E Gasket (2) • Be careful do not lose the gasket of the expansion vessel. • Check the gasket (2), if it is defective, replace by a new one. 11.2.4 Replacing refrigerant parts D A N G E R • Disconnect the Yutaki S from the power supply before touching any of the parts. Do not touch the electrical box before disconnecting it in order to avoid an electrical shock.
  • Page 333 11 Servicing 7 Put the drive part onto the valve body, hold them with their axes matching and attach the lock nut to the screw  part of the valve body. 8 Tighten the lock nut with spanner after tightening lightly  by hand. The tightening torque must be within the range of: 12 N•m – 15 N•m. 9 After the replacement, attach the electronic expansion valve in the reverse procedures for removing.
  • Page 334 11 Servicing 9 Remove low water pressure switch (LWPS) by perform procedure Replace low water pressure switch. 10 Unscrew the copper pipe connected to the pressure gage from expansion vessel. 11 Remove refrigerant liquid thermistor (THM ) from pipe by perform procedure Replace thermistors.
  • Page 335 11 Servicing 18 Remove plate heat exchanger with water and refrigerant pipes and expansion valve. 19 Install new one by performing the procedures above in reverse way. N O T E • Be careful do not lose the gaskets. • Check the gaskets, if it is defective, replace by a new ones.

  • Page 337: Troubleshooting

    12 Troubleshooting 1 2 . T r o u b l e s h o o t i n g Index 12.1. Troubleshooting procedure ......................... 300 12.1.1. Alarm code .............................. 300 12.1.2. Troubleshooting by alarm code ....................... 303 12.1.3. Troubleshooting in check mode ....................... 370 12.1.4.

  • Page 338: Troubleshooting Procedure

    12 Troubleshooting 12.1 Troubleshooting procedure 12.1.1 Alarm code Alarm Code Indication on Remote Control Switch: Alarm code Alarm indication  Alarm code table Retry Alarm stop Origin Detail of abnormality Main cause code code Activation of outdoor unit protection device Outdoor High pressure interrupting device activated (Except for Alarm Codes 41, 42)
  • Page 339 12 Troubleshooting Retry Alarm stop Origin Detail of abnormality Main cause code code Indoor units with the same number in a refrigerant piping Outdoor Indoor unit number setting error system Outdoor Outdoor protection detection circuit abnormality Outdoor PCB abnormality, error in wiring to outdoor PCB Outdoor heat exchanger clogging/short circuit, broken ...
  • Page 340 12 Troubleshooting  Cause of compressor stop When the compressor stops due any of the factors below, Stop Reason Code (d1 Code) is sent to Indoor Unit. The Code will be overridden when another Code is sent before it. Stop Reason Stop Factors 52C Process...

  • Page 341: Troubleshooting By Alarm Code

    12 Troubleshooting 12.1.2 Troubleshooting by alarm code Alarm code Activation of the safety device in the 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 342 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Check the heat  Remove the dust or exchanger for dust the clogging or for clogging Check the air filter  Remove the dust for dust Insufficient air flow to the  Check for any obs- heat exchanger tacles at the inlet (outdoor heat exchanger Remove the obstacles or the outlet of the during the cooling process or...
  • Page 343 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Check for clogging Remove the clogging Check the connect  wiring and the Replace the connector connectors Check the  operation sound Replace the coil Faulty or malfunction of from the coil the expansion valve Check the dischar- Replace the thermistor ge gas thermistor...
  • Page 344 12 Troubleshooting Alarm code Abnormal transmission between the indoor units and the 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. This alarm is displayed when an abnormal operation is maintained for three minutes after the normal transmis- sion between the indoor units and the outdoor unit.
  • Page 345 12 Troubleshooting Is DSW5-1P Set it correctly (terminal resistance on PCB1) ON? Is the voltage Check the fuses of the  Is LED1 (red) on between the termi- outdoor unit power PCB1 ON? nal “1” and “3” of PCB1 supply 220V or 240V? *2) Is connector Plug PNC2 and CN11 (PCN2, CN1) for the Remove CN8 of PCB1...
  • Page 346 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage Power failure or no power supply Supply the power using the tester Check the insulation  Remove the short circuit and Short circuit between wires material for breaks replace the fuse Measure the insulation Remove the short circuit to Short-circuited wire to ground...
  • Page 347 12 Troubleshooting Alarm code Abnormal transmission between inverter and Outdoor PCB1 (RAS-2HVRN2) •  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. This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission between the outdoor unit PCB1 and IPM.
  • Page 348 12 Troubleshooting Abnormal transmission between inverter PCB2 and outdoor PCB1 Alarm code (RAS-(3-6)H(V)RNME-AF) •  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. This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission between the outdoor unit PCB1 and inverter PCB2.
  • Page 349 12 Troubleshooting Abnormal transmission between Inverter PCB2 and outdoor PCB1 Alarm code (RAS-(8-10)HRNME-AF) •  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. This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission between the outdoor unit PCB1 and PCB2.
  • Page 350 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Between control PCB1, PCB2 and Check the continuity Disconnected FANM of wires. wires, insuffi- Replacing wires, repairing, Check for looseness of  cient contacting tightening screws and the connection screws. or incorrect incorrect wiring Check the connection  Power source wiring for the outdo- connection or unit...
  • Page 351 12 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. This alarm is displayed when the main power source phase is reversely connected or one phase is not connected.
  • Page 352 12 Troubleshooting Alarm code Excessively low voltage or excessively high voltage for the inverter (RAS-2HVRN2) •  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. This alarm code is displayed when the voltage of IPM is insufficient and the alarm has three occurrences in 30 ...
  • Page 353 12 Troubleshooting Excessively low voltage or excessively high voltage for the inverter Alarm code (RAS-(3-6)HVRNME-AF) •  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. This alarm code is displayed when the voltage between terminal “P” and “N” of Dip IPM is insufficient and the ...
  • Page 354 12 Troubleshooting Alarm code Excessively low voltage or excessively high voltage for the inverter (RAS-(4-6)HRNME-AF) •  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. This alarm code is displayed when the voltage between terminal “P” and “N” of ISPM is insufficient and the alarm ...
  • Page 355 12 Troubleshooting Excessively low voltage or excessively high voltage for the inverter Alarm code (RAS-(8/10)HRNME-AF) •  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. This alarm code is displayed when the voltage between terminal “P” and “N” of ISPM is insufficient and the alarm ...
  • Page 356 12 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. This alarm code is indicated as follows: The temperature on the top of the compressor is less than the target and also the I.U.
  • Page 357 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Check refrigerant  Refrigerant cycle is different from cycle and the electrical Repair wiring the electrical system system Overcharged refrigerant Measure pressure Correctly charge refrigerant Check expansion val- ve. Refer to Checking Replace expansion valve if Faulty Expansion Valve procedure for the elec-...
  • Page 358 12 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. The alarm appears during cooling operation when the compressor-top thermistor remains at Tdc1 or above for 10 minutes, or at Tdc2 or above for 5 seconds.
  • Page 359 12 Troubleshooting Alarm code Water inlet Temperature (Twi) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB •  This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 18.2 kΩ)  during the cooling process or the heating process. Is THMwi Connect it connected to (intake) ...
  • Page 360 12 Troubleshooting Alarm code Water outlet Temperature (Two) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 18.2 kΩ)  during the cooling process or the heating process. Is THMwo Connect it connected to (intake) ...
  • Page 361 12 Troubleshooting Alarm code Indoor liquid pipe Temperature (Tl) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ)  during the cooling process or the heating process. Is THML Connect it connected to (intake) ...
  • Page 362 12 Troubleshooting Alarm code Indoor gas pipe Temperature (Tg) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 840 kΩ)  during the cooling process or the heating process. Is THMG connected to (intake) ...
  • Page 363 12 Troubleshooting Alarm code Water outlet circuit 2 (mix circ.) Temperature (Two2) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. • ...
  • Page 364 12 Troubleshooting Alarm code Domestic Hot Water Temperature (TDHW) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the thermistor is short-circuited (less than 1.11 kΩ) or cut (greater than 220.6 kΩ)  when DHWT is enabled. Is THMdhwt connected to (intake) ...
  • Page 365 12 Troubleshooting Temp (ºC) Resist (Ω) Temp (ºC) Resist (Ω) Temp (ºC) Resist (Ω) Temp (ºC) Resist (Ω) Temp (ºC) Resist (Ω) Temp (ºC) Resist (Ω) -20.0 220600 66515 22.0 23032 43.0 8983 64.0 3877 85.0 1824 -19.0 207607 63046 23.0 21967 44.0...
  • Page 366 12 Troubleshooting Alarm code Swimming pool (THM ) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the sensor is abnormality when SWIMMING POOL is enabled. Is ATW-SPS-01 connected to (intake) ...
  • Page 367 12 Troubleshooting Table 1 - Temperature/resistance relationship, R  = 100.00 Ω Resistance at the temperature t 1ºC Ω 1ºC 1ºC -200 18.52 -200 -190 22.83 22.40 21.97 21.54 21.11 20.68 20.25 19.82 19.38 18.95 -190 -180 27.10 26.67 26.24 25.82 25.39 24.97 24.54 24.11 23.68...
  • Page 368 12 Troubleshooting Alarm code Water outlet 3 (boiler circ.) Temperature (Two3) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater than 18.2 kΩ)  when boiler enabled.
  • Page 369 12 Troubleshooting Alarm code Water outlet HP (After Heat Exchanger) Temperature (TwoHP) Thermistor Abnormality •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. • ...
  • Page 370 12 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 371 12 Troubleshooting Alarm code 2nd ambient temperature sensor (THM ) Thermistor Abnormality AMB2 •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when the sensor is abnormality when 2ND ambient sensor option is enabled. Is ATW-2OS-01 connected to (intake) ...
  • Page 372 12 Troubleshooting Table 1 - Temperature/resistance relationship, R  = 100.00 Ω Resistance at the temperature t 1ºC Ω 1ºC 1ºC -200 18.52 -200 -190 22.83 22.40 21.97 21.54 21.11 20.68 20.25 19.82 19.38 18.95 -190 -180 27.10 26.67 26.24 25.82 25.39 24.97 24.54 24.11 23.68...
  • Page 373 12 Troubleshooting Abnormal operation of the thermistor for the outdoor temperature (outdoor unit ambient Alarm code 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. This alarm code is displayed when the thermistor is short-circuited (less than 0.2 kΩ) or cut (greater than 500 kΩ) ...
  • Page 374 12 Troubleshooting Abnormal operation of the thermistor for the evaporating temperature during the heating Alarm code process (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. If you find an abnormal operation ...
  • Page 375 12 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. This alarm code is indicated when the total indoor unit capacity is not equal to the combined outdoor unit capacity.
  • Page 376 12 Troubleshooting Alarm code Incorrect indoor number setting •  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. This alarm code is indicated 3 minutes after power is supplied to the outdoor unit when the indoor unit no.
  • Page 377 12 Troubleshooting Alarm code Abnormality of Protective Circuit for Protection (Outdoor Unit) (RAS-2HVRN2) •  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. The alarm code appears if approx.
  • Page 378 12 Troubleshooting Alarm code Abnormality of protective circuit for protection (outdoor unit) (RAS-(3-10)H(V)RNME-AF) •  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 379 12 Troubleshooting Alarm code Cooling Overload (High pressure switch will be activated) (RAS-2HVRN2) •  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. Abnormality indication will appear when the protection device is activated during compressor operation at cooling, with the outdoor unit evaporation temperature higher than 55°C and the compressor-top temperature higher than 95°C.
  • Page 380 12 Troubleshooting Alarm code Cooling overload (high pressure switch will be activated) (RAS-(3-10)H(V)RNME-AF) •  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. This alarm code is indicated when the protection device is activated at following condition.
  • Page 381 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Clogging of heat Remove clogging exchanger? Check for dust on  Remove dust air filter Insufficient air flow to heat  exchanger of outdoor unit Check the service  Secure service space space Check for speed: Outdoor fan: cooling Replace fan motor if faulty Indoor fan: heating Check for hot air near ...
  • Page 382 12 Troubleshooting Alarm code Heating Overload (High pressure switch will be activated) (RAS-2HVRN2) •  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. Abnormality indication will appear when the protection device is activated during compressor operation at hea- ting, with the indoor unit liquid refrigerant (piping) temperature higher than 55 °C and the compressor-top tempe- rature higher than 95 °C.
  • Page 383 12 Troubleshooting Alarm code Heating overload (high pressure switch will be activate) (RAS-(3-10)H(V)RNME-AF) •  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. This alarm code is indicated when the protection device is activated at following condition.
  • Page 384 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Clogging of water Water strainer maintenance strainer Check for any obstacle  Insufficient water flow to  at inlet or outlet of Remove it indoor unit heat exchanger heat exchanger Check water pump Replace water pump Measure discharge Faulty pressure.
  • Page 385 12 Troubleshooting Activation to protect system from excessively low suction pressure Alarm code (protection from vacuum operation) •  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 386 12 Troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Faulty freeze protection. Fault Check resistance Replace thermistor if faulty Thermistor of indoor unit. Evaporating Incorrect connection Check wiring to PCB Repair wiring and connections thermistor of outdoor unit. Replace PCB and Faulty PCB (outdoor unit, indoor unit) Replace PCB if faulty check operation...
  • Page 387 12 Troubleshooting Alarm code Activation Protection Against Instantaneous Overcurrent of Inverter (RAS-2HVRN2) O.U.:Outdoor Unit Compressor stops Turn OFF power I.U.:Indoor Unit immediately and disconnect U, Is there any V, W from compressor cause of ins- Restart terminals. Check the compressor tantaneous voltage operation.
  • Page 388 12 Troubleshooting Alarm code Overcurrent protection activation (RAS-(3-10)H(V)RNME-AF) Turn OFF power and disconnect U, Is there any Restart V, W from compressor cause of ins- operation. terminals. Check the compressor tantaneous voltage Does it trip soon? Turn ON #1 of DSW1 on PCB2 decrease? (IPM or dipIPM) and restart.
  • Page 389 12 Troubleshooting Alarm code Abnormality of current sensor (RAS-2HVRN2) •  “RUN” light flashes and “ALARM” is indicated on the remote control switch. •  The unit number, alarm code and the unit code is alternately indicated on the set temperature section, and the alarm code is indicated on the display of the outdoor unit PCB. This alarm code is indicated when the below condition is activated 3 times including 3 in 30 minutes.
  • Page 390 12 Troubleshooting Alarm code Abnormal operation of the current transformer (0A detection) (RAS-(3-10)H(V)RNME-AF) •  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. This alarm code is indicated when the below condition is activated 3 times including 3 in 30 minutes.
  • Page 391 12 Troubleshooting Alarm code Transistor module protection activation (RAS-2HVRN2) •  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. This alarm is displayed when the inverter PCB or DIP-IPM module detects the abnormal operation 7 times or more than 7 times in 30 minutes.
  • Page 392 12 Troubleshooting Protection activation of IPM or DipIPM and PCB2 (RAS-(3-6)HVRNME-AF and Alarm code RAS-(8/10)HRNME-AF) •  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. IPM or Dip IPM and PCB2 have detecting function of abnormality.
  • Page 393 12 Troubleshooting Alarm code Activation for protecting the ISPM (RAS-(4-6)HRNME-AF) •  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. ISPM has a detection function of the abnormal operation.
  • Page 394 12 Troubleshooting Alarm code Increase in the inverter fin temperature •  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. If the alarm code “51”...
  • Page 395 12 Troubleshooting Alarm code IPM or PCB2 abnormality •  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. In case that the abnormality of alarm code 55 occurs four times within 30 minutes, the alarm code of abnormality occurred for the fourth time is indicated.
  • Page 396 12 Troubleshooting Alarm code Abnormality of fan motor protection (DC fan motor) •  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. The fan motor stops when the revolution output from the fan motor is 20 rpm (RAS-2HVRN2) or 10 rpm (RAS-(3- 10)H(V)RNME-AF) or lower during 30 seconds (RAS-2HVRN2) or 10 seconds (RAS-(3-10)H(V)RNME-AF) after the fan motor activation.

  • Page 397: Contents

    12 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 ope- rates 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 398 12 Troubleshooting Alarm code Hydraulic alarm •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when there is a flow or pressure failure (water flow too low) (water pressure to low). Restart operation Voltage in Check fuse EF4 Is water pump water pump1? 1 running? Check for correct wiring...
  • Page 399 12 Troubleshooting Alarm code No feed back signal from water pump •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when pump1 operation feedback signal is OFF while pump interlock is ON. Is the voltage Is thermal between connector relay for pump1 PCN4-1 and PCN4-3 on Check the Pump Lock...
  • Page 400 12 Troubleshooting Alarm code Thermostat Heater Alarm •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when electrical heater’s thermal protection is open (>75ºC). Is the electri- Reset the thermal cal heater...
  • Page 401 12 Troubleshooting Alarm code Mixing Overheating Limit Protection for mixed circuit (Only if Circuit 2 is enabled) •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. • ...
  • Page 402 12 Troubleshooting Alarm code Unit Overheating Limit Protection •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when temperature of the unit is 5ºC more than maximum water outlet installer configu- ration for circuit 2 or 5ºC more than maximum water outlet by unit operating range. Is the water outlet Check to make sure the electrical heater’s ...
  • Page 403 12 Troubleshooting Alarm code Freeze Protection by Cold water inlet, outlet temperature detection •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when temperature the unit is less than 2ºC or 5ºC lower than maximum water outlet installer configuration (cooling) during operation.
  • Page 404 12 Troubleshooting Alarm code Freeze Protection Stop by indoor liquid temperature thermistor •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when refrigerant temperature of the indoor unit is lower than -20ºC for 30 seconds. Is the water refrigerant tempe- Refer to...
  • Page 405 12 Troubleshooting Alarm code Opentherm communication failure (Only with intelligent thermostat accessory) •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when there is no Opentherm communication for a continuous period of 1 minute. Are the connections between PCB1 and RF Receiver...
  • Page 406 12 Troubleshooting Alarm code RF communication failure (Only with intelligent thermostat accessory) •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when there is no communication for 1 hour with one or two Room thermostat devices that are bound to the RF-bridge.
  • Page 407 12 Troubleshooting Alarm code Incorrect capacity setting •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when there is no concordance between indoor outdoor unit capacity. Are the capacity concordance between indoor and outdoor correct?

  • Page 408: Troubleshooting In Check Mode

    12 Troubleshooting Alarm code H-Link communication failure between Indoor and LCD User interface •  The alarm code is displayed on the LCD User interface. •  The alarm code is displayed on the seven segments of the indoor unit PCB. •  This alarm code is displayed when there is no communication for 3 minutes between Indoor PCB1 and LCD User interface.

  • Page 409: Troubleshooting Using The 7 Segment Display (Outdoor Unit)

    12 Troubleshooting 12.1.4 Troubleshooting using the 7 segment display (outdoor unit)  Simple checking by 7-segment display Turn ON indoor unit connected to During  auto-addressing,  the  following  items  can  be  checked  using  the outdoor unit the outdoor unit’s on-board 7-segment LED display: 1 Disconnection of power supply to the indoor unit.
  • Page 410 12 Troubleshooting Item Indication data Item Check Contents dic. dic. Total capacity of indoor unit connected CP 22 00~96 Input/output state of outdoor micro- Indicates only for the segments corresponding to the equipment in  computer the figure. (See figure above) Alarm code for abnormal stoppage of AC 08 Alarm code on compressor compressor...
  • Page 411 12 Troubleshooting Cause of inverter stoppage (11) Cause of indoor unit stoppage (20) Indication Contents Indication Contents Operation OFF, Power OFF IPM, ISPM, dipIPM error Thermo-OFF Instantaneous over current Alarm Inverter fin thermistor protection activation Freeze protection overheating protection Electronic thermal activation Instantaneous power failure at outdoor unit Inverter voltage decrease Instantaneous power failure at indoor unit Over voltage...
  • Page 412 12 Troubleshooting Cause of inverter stoppage Remark Cause of stoppage for Code Cause Indication during corresponding unit Alarm code retry Automatic stoppage of transistor module (IPM, ISPM, dipIPM Error) (Over current, decrease voltage, short circuit protection) Instantaneous over current Abnormal inverter fin thermistor Electronic thermal activation Inverter voltage decrease Over voltage...
  • Page 413 12 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 414 12 Troubleshooting  Activating condition of protection control code For following the conditions as the temperature change, etc., the control of frequency, etc. is performed to prevent the abnormal conditions by the protection control. The activating conditions of protection control are shown in the table below. Code Protection control Activating condition...

  • Page 415: Procedure Of Checking Other Main Parts

    12 Troubleshooting 12.1.5 Procedure of checking other main parts 1 High voltage discharge work for replacing parts D A N G E R Perform this high voltage discharge work to avoid an electric shock Procedure: a. Turn OFF the main switches and wait for three minutes. Check to ensure 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. b.
  • Page 416 12 Troubleshooting Remove all the terminals of the transistor module before check. If items (a) to (d) are performing and the results are satis- factory, the transistor module is normal. Measure it under 1kΩ range of a tester. Do NOT use a digital tester. a. By touching the + side of the tester to the P terminal of transistor module and the - side of tester to U, V and W of transistor module, measure the resis- tance. If all the resistances are from 1 to 5kΩ, it is ...
  • Page 417 12 Troubleshooting 3 Checking method of diode module Outer appearance and internal circuit of diode module If items (a) to (d) are performing and the results are satisfactory, the diode module is normal. Measure it under 1kΩ range of a tester. Do NOT use a digital tester. a. By touching the + side of the tester to the + terminal of diode module and the - side of tester to the ~ terminals  (3 NOs.) of the diode module, measure the resistance. If all the resistances are from 5 to 50kΩ, it is normal.
  • Page 418 12 Troubleshooting  Fault diagnosis procedure Fault diagnosis of DC fan motor. About fan motor fault diagnosis: When ISPM/DIP-IPM is faulty and alarm 53 appears, the fan motor may also be damaged. After replacing the new ISPM/ DIP-IPM, ISPM/DIP-IPM will be damaged again if it operates with a damaged fan motor. Check also if the fan motor is not  damaged when IPM/DIP-IPM is replaced. C A U T I O N • Turn OFF main power before start working.
  • Page 419 12 Troubleshooting  Checking procedure for the ISPM Remove all the terminals of the ISPM before check. Rectification parts of internal circuit of ISPM (common) If items (a) to (h) are performed and the results are satisfactory, ISPM is normal. Measure it under 1 kΩ range of a tester. C A U T I O N • Perform the high voltage discharge procedure as described • Do not use a digital tester. a. By touching the + side of the tester to the P1 terminal of ISPM and the - side of the tester to R and S of ISPM, measure the resistance.
  • Page 420 12 Troubleshooting  Checking procedure for the electronic expansion valve Indoor unit electronic expansion valve Outdoor unit electronic expansion valve Locked with fully closed Check  the  liquid  pipe  temperature  during  the  It is abnormal if the liquid pipe pressu- heating process. It is abnormal if the temperatu- re does not increase during the cooling re does not increase.
  • Page 421 12 Troubleshooting  Checking procedure for the compressor Check list on compressor Client:___________________________ Model: __________________________ Date: ______________________ Serial No.: _______________________ Production date: __________________ Checker: ___________________ 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 422 12 Troubleshooting •  Additional Information for “CHECK LIST ON COMPRESSOR” Check item Additional information (mechanism of the 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 1 &...
  • Page 424 Hitachi Air Conditioning Products Europe, S.A. Ronda Shimizu, 1 - Políg. Ind. Can Torrella 08233 Vacarisses (Barcelona) España 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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