Page 1 YUTAKI SERIES RHUE-A(V)HN Air to water Heat pump • RHUE-3AVHN • RHUE-4AVHN • RHUE-5A(V)HN • RHUE-6A(V)HN...
Page 3 Specifications in this manual are subject to change without notice in order that HITACHI may bring the latest innovations to their customers. Whilst every effort is made to ensure that all specifications are correct, printing errors are beyond Hitachi’s control; Hitachi cannot be held responsible...
Page 5 Contents Service Manual C o n t e n t s o n t e n t s Model codification and accessory codes Units installation Water pipe installation Electrical wiring connections and diagram Control system Available optional functions Test run Troubleshooting Spare parts Servicing...
Page 7: Table Of Contents
Contents Service Manual GEnErAl IndEx Units installation ..........................15 1.1. RHUE-(3~6)A(V)HN ........................17 1.1.1. Transportation ............................17 1.1.2. Center of gravity .............................18 1.1.3. Installation space ...........................19 1.1.4. Place provision ............................20 1.1.5. Optional parts ............................22 1.2. Accessories Installation .......................27 1.2.1. Pump kit ..............................27 1.2.2. WEH - Water Electric Heater ........................28 1.2.3.
Page 8 Contents Service Manual 3.6. Electrical wiring diagrams......................65 3.6.1. Electrical wiring diagram for models RHUE-(3~6)AVHN ................66 3.6.2. Electrical wiring diagram for RHUE-(5/6)AHN ..................67 Control system ..........................69 4.1. System configuration, settings and control system ..............73 4.1.1. Description .............................73 4.1.2. System controller overview ........................73 4.1.3. Contents of the controller pack ......................74 4.1.4.
Page 9 Contents Service Manual 4.6. Boiler control functions ........................95 4.6.1. Boiler Control............................95 4.6.2. Supply-Return Difference Check ......................96 4.6.3. Boiler Minimum On / Off Times ......................97 4.6.4. Boiler Waiting Time ..........................97 4.6.5. Maximum Outdoor Temperature for Boiler Operation ................97 4.7. Electric heater control functions ....................98 4.7.1.
Page 10 Contents Service Manual 4.16. Electrical wiring ......................... 113 4.16.1. Wiring access ports ..........................113 4.16.1. Wiring connections ..........................114 4.16.2 System component connections ......................115 4.17. System configurations ....................... 118 4.18. User interface ..........................123 4.18.1. Display..............................123 4.18.2. Controls ..............................123 4.19. Installation configuration settings ....................124 4.19.1.
Page 11 Contents Service Manual 4.24. Yutaki unit PCB .........................144 4.25. Safety and control device setting ....................145 4.25.1. Defrost operation control ........................147 4.25.2. Control of expansion valve ........................149 Available optional functions......................151 5.1. Freeze protection ........................152 5.2. Restart after power failure ......................152 5.3. Compressor ON/OFF control ....................153 5.4.
Page 12 Contents Service Manual 7.6. Troubleshooting of accessories ....................227 7.6.1. Pump kit ...............................227 7.6.2. WEH - Water Electric Heater ........................228 7.6.3. DHWT - Domestic Hot Water Tank .......................228 Spare parts ..........................229 8.1. Spare parts of Yutaki .........................230 8.1.1. Cycle and estructural parts ........................230 8.1.2.
Page 13 Contents Service Manual ModEl CodIfICATIon And ACCESSory CodES Unit code list ¡ List of air to water units and accessories available in this Service Manual. YUTAKI RHUE UNITS AVHN UNITS AHN UNITS Unit Code Unit Code RHUE-3AVHN 9E311100 RHUE-4AVHN 9E411100 RHUE-5AVHN 9E511100 RHUE-5AHN...
Page 14 Contents Service Manual LIST of AccESSoRY codES Name description code figure STE1 Water temperature sensor 9E500004 RMPID1 Extension controller 9E500005 Pump Kit A Pump kit A (TOP-S 25/7) 9E500006 Pump Kit B Pump Kit B (TOP-S 25/10) 9E500007 EH61 Heater 6 kW EH61 BDHM1 BDHM1...
Page 15 Contents Service Manual Name description code figure Domestic Hot Water Tank DHWT200E-2.5H1E, 1~230V 50Hz 70544000 Enamelled / 200L. Domestic Hot Water Tank DHWT300E-2.5H1E, 1~230V 50Hz 70544001 Enamelled / 300L. Domestic Hot Water Tank DHWT200S-2.5H1E, 1~230V 50Hz 70544100 Stainless / 200L. Domestic Hot Water Tank DHWT300S-2.5H1E, 1~230V 50Hz 70544101 Stainless / 300L.
Page 17: Units Installation
Unit installation Service Manual UnITS InSTAllATIon This chapter provides information concerning the installation of Yutaki units. ConTEnTS 1.1. RHUE-(3~6)A(V)HN ........................17 1.1.1. Transportation ............................17 1.1.2. Center of gravity .............................18 1.1.3. Installation space ...........................19 1.1.4. Place provision ............................20 1.1.5. Optional parts ............................22 1.2.
Page 18 Unit installation Service Manual  danger Electrical hazard. Risk of death. Before gaining access to terminals or performing any maintenance operation, turn OFF all power switches and disconnect all supply circuits. Check that the LED201 (red) located on the DIP-IPM is OFF. Do not touch the electrical components when LED201 (Red) is ON in order to avoid an electrical shock.
Page 19: Rhue-(3~6)A(V)Hn
Unit installation Service Manual 1.1. rHUE-(3~6)A(V)Hn 1.1.1. Transportation  warning Malfunction. Unit failure. Do not put any foreign material into the unit and make sure that none exists inside the unit before the installation or test run. • Hanging method When hanging the unit, ensure its balance and lift it up smoothly and safely. Do not remove any packing materials until the unit is positioned and hang the unit under packing condition with two ropes, as shown in the figure below.
Page 20: Center Of Gravity
Unit installation Service Manual 1.1.2. Center of gravity When the unit is lifted manually (using the handles), pay attention to the following: do not remove the wooden base from the unit to prevent its overturning. Pay attention to the center of gravity shown in the below figure. Center of gravity Center of gravity position operation weight (mm) Unit model (kg) RHUE-3AVHN RHUE-4AVHN RHUE-5AVHN RHUE-5AHN RHUE-6AVHN RHUE-6AHN  note It is recommended that at least two people participate when lifting is done manually. SMGB0066 rev.0 - 12/2009 RHUE-(3~6)A(V)HN...
Page 21: Installation Space
Unit installation Service Manual 1.1.3. Installation space Single installation Around sides are open Around sides are open with obstacles above 0
Page 22: Place Provision
Unit installation Service Manual 1.1.4. Place provision • Concrete foundation Foundation shall be on a level surface and it is recommended to be 100-300 mm higher than ground level. Use M10 anchor bolts to fix the unit to the foundation. (Foundation bolts, nuts and washers are not included, and must be field supplied). Drain water might turn into ice on cold weather areas. Therefore, when installing the unit on a roof or a veranda, avoid the draining on a public area since it may become slippery. ...
Page 23 Unit installation Service Manual The foundation drawing shown previously is an example. The unit is low-vibration model, but consider using some floor reinforcement or anti-vibration mat/rubber when vibration should occur due to weakness of attached surface. The foundation shall be unified with the floor slab. If not, calculate the vibration proof of the installation of Yutaki Unit as well as of the Yutaki Unit with the foundation in order to ensure strength against a fall or for when the unit has to be moved.
Page 24: Optional Parts
Unit installation Service Manual • Installing location where the unit will be exposed to strong wind Strong winds against the unit´s air outlet causes short circuits and these can be the consequences: Lack of air flow and adversely affect to Adverse strong wind normal function. Frequent frost acceleration. Fan can rotating very fast until it breaks.
Page 25 Unit installation Service Manual • Air flow guide Specifications Model AG-335A View from A Quantity 2 per unit Upward (downward), left & Mounting dimension Air discharge direction right Weather proof polypropylene Material resin Color Gray Weight 1.9 kg Fixing screw x 4 [M5 (SUS) Air flow guide Accessories x 20]...
Page 26 Unit installation Service Manual • Wind guard Specifications Model WSP-335A Quantity 2 per unit Material Galvanized sheet metal + baked painting Color Gray (1.oY8.5/0.5) (Mounting dimension) Weight 5.5 kg Air flow Accessories Fixing screw x 4 [M5 (SUS) x 20] Installation manual Installation restriction “Guard net”, “Air flow guide” or “Snow protection hood”...
Page 27 Unit installation Service Manual • Snow protection hood Air discharge hood Part name Qty.  Right side  plate  Left side  plate Fixing screw (Accessories) Hole for safety wire Front panel  rope to prevent overturning  Stay ...
Page 28 Unit installation Service Manual • Attaching example of snow protection hood Fixing screw (Accessories) Left suction hood Fixing screw Air discharge hood (Accessories) Fixing screw Rear suction hood (Accessories) Air discharge grille Upper side Air discharge hood Wire rope Front side (Optional.
Page 29: Accessories Installation
Unit installation Service Manual 1.2. ACCESSorIES InSTAllATIon 1.2.1. Pump kit  note Minimum inlet pressure at the pump suction side in order to prevent cavitation noises at an ambient temperature of +40ºC and a water temperature of Tmax: Tmax Minimum inlet pressure +50ºC 0.05 bar +95ºC...
Page 30: Weh - Water Electric Heater
Unit installation Service Manual 1.2.2. WEH - Water Electric Heater name of parts Ref. Qty. Name Ref. Qty. Name Tank body   Front E-casing 3-pole contactor   Back E-casing Thermostat   Tank in-connection Terminal board   Wall support Packing gland ...
Page 31 Unit installation Service Manual  caution Insufficient ventilation. Can cause oxygen deficiency. Working with insufficient ventilation, in an enclosed space, can produce toxic gas, especially when cleaning agent is heated to high temperature by, e.g., being exposed to fire. Do not install WEH near any flammable substance. Place provision Drill 2 holes Ø 8mm on the wall for fixing WEH according to the dimensions of the Wall Support attached.
Page 32: Dhwt - Domestic Hot Water Tank
Unit installation Service Manual 1.2.3. dHWT - domestic Hot Water Tank name of parts DHWT (200/300)S-2.5H1E Ref. Qty. Name 1 Inspection aperture  1 HSW storage tank  1 External covering  1 Top cover  1 Thermal insulation  1 Control panel ...
Page 33 Unit installation Service Manual Unit installation Transport the products as close as possible to the installation location before unpacking. Check the contents of the package: DHWT Model Installation and Operation Manual & Documents Selection procedure for dHWT units  note WEH appliance must be installed in an indoor place.
Page 35: Water Pipe Installation
Water pipe installation Service Manual WATEr PIPE InSTAllATIon This chapter provides information about the procedures to perform water piping work connections for Yutaki units. ConTEnTS General notes ..........................34 2.2. Piping work connection considerations ..................35 2.2.1. Minimum water volume description ......................35 2.2.2.
Page 36: General Notes
Water pipe installation Service Manual 2.1 GEnErAl noTES Connect all pipes as close as possible to the unit, so that disconnection can be easily performed when required. It is recommended to use flexible joints for the piping of water inlet and outlet, so vibration will not be transmited. Whenever possible, sluice valves should be installed for water piping, in order to minimise flow resistance and to maintain sufficient water flow. Proper leak inspection should be performed to check for leaking parts inside and outside the system, by completely opening the hot water inlet and outlet valves to the water condenser. Additionally, install equip valves to the inlet and outlet piping. This unit is equipped with an air purge at the highest position of the water system. If this position is not the highest one within the whole water installation, equip another air purge.
Page 37: Piping Work Connection Considerations
Water pipe installation Service Manual Pressure gauge  Strainer  Flexible joint  Valve  Check valve   caution Malfunction. Damage by clogging. This product is equipped with plate heat exchanger type. In the heat exchanger, water flows through a narrow space between the plates.
Page 38 Water pipe installation Service Manual  note The shaded part of the pipe system below. (Excluding the expansion tank (cistern)) Calculate and ensure that the water volume in the system is equal or greater than the larger value obtained from: Protective water volume for product Minimum water volume for temperature drop during defrost operation When the minimum water volume can not be ensured, use a Buffer tank to compensate the shortage (<0) of water (2). See...
Page 39: Correction Factor Due To Use Of Glycol
Water pipe installation Service Manual  note The factory default ON/OFF temperature differential is “4 °C”. Note that the minimum water volume varies for different setting for each purpose as shown in the table above. Minimum required water volume during defrosting The following table shows the minimum water volume needed in each YUTAKI unit in case of a permitted drop in temperature of 10ºC.
Page 40: Water Check Valve
Water pipe installation Service Manual The following table shows the reference values fo the most important parameters concerning the quality of the water: Water System Tendency Item Circulating Water Supply Water Corrosion deposits of scales (20 C less than) Standard quality pH (25 °C) 6.8 ~ 8.0 6.8 ~ 8.0 Electrical conductivity (mS/m) (25°C)
Page 41: Accessories Hydraulic Installation
Water pipe installation Service Manual Installation guidelines: Note flow direction (indicated by arrow) when installing the check valve. In a drinking water supply the check valves are fitted immediately after water meter. This position ensures optimum protection for the drinking water supply. Install in horizontal pipework with test plugs directed downwards. This position ensures optimum protection efficiency and is the best for testing the valve. Shutt off valves should be fitted on each side of the check valve for easier and faster valve testing. The installation location should be protected against frost and be easily accessible. 2.5. ACCESSorIES HydrAUlIC InSTAllATIon 2.5.1.
Page 42: Weh- Water Electric Heater
Water pipe installation Service Manual Remove service cover 1 (item 1) and service cover 2 (item 2). Unscrew the nut of the plate heat exchanger assembly (item 3) and the nut of the water pipe 2 assembly (item 6) in order to disassemble water pipe1 (item 5) from the Yutaki unit.
Page 43 Water pipe installation Service Manual In order to prevent this, during shutdown periods it is useful to empty the water from the installation.  note In cases where water drainage is difficult, an antifreeze mixture of glycol (ethylene or propylene) should be used (content between 10 % and 40 %). The performance of the unit working with glycol may decrease in proportion to the percentage of glycol used, since the density of glycol is higher than that of water.
Page 44: Dhwt- Domestic Hot Water Tank
Water pipe installation Service Manual  note Calculate and ensure that the water volume in the system is enough (see Yutaki product manual for recommendations). Water control  caution Malfunction. Damage by poor quality water. When it is used industrial water inside hydraulic system, it rarely causes deposits of scales or other foreign substances on the equipment.
Page 45 Water pipe installation Service Manual dHWT(200/300)(E/S)-2.5H1E Ref. Name H.S.W.  Sanitary safety valve unit  Recirculation Non-return valve Circulator   Recirculation pump Input Shutoff cock  Return Drain   Drain valve Mains water input Heating coil  • Pressure drop DHWT(200/300)E-2.5H1E DHWT(200/300)S-2.5H1E...
Page 46: Water Drain Discharge Connection
Water pipe installation Service Manual Name Main inlet water  DHWT inlet connection   Security valve and manual empty Emptying connection  Check valve   Close valve 2.5.4. Water drain discharge connection • drain discharging boss When the base of the Yutaki is temporarily used as a drain receiver, the drain boss should be connected to the drain pipe. See the below figure for further details. Model Applicable Model DBS-26...
Page 47: Electrical Wiring Connections And Diagram
Electrical wiring Service Manual ElECTrICAl WIrInG ConnECTIonS And dIAGrAM This chapter describes the procedures to carry out the electrical wiring connections for the Yutaki and its control system. ConTEnTS 3.1. General check ..........................46 3.2. Electrical wiring connection ......................47 3.2.1. Field minimum wire sizes for the power source ..................48 3.2.2.
Page 48: General Check
Electrical wiring Service Manual 3.1. GEnErAl CHECK  danger Electrical hazard. Can cause serious injuries or death. Do not connect or adjust any wiring or connections unless the main power switch is OFF. Make sure that all the power sources are switched OFF. Check that the earth wire is securely connected, tagged and locked in accordance with national and local codes.
Page 49: Electrical Wiring Connection
Electrical wiring Service Manual Harmonics situation of each model regarding IEC 61000-3-2 and IEC 61000-3-12 is as follows: Ssc “xx” ModElS SITUATIon rEGArdInG IEC 61000-3-2 And IEC 61000-3-12 Ssc “xx” ModElS (kVA) RHUE-5AHN Equipment complying with IEC 61000-3-2 (Professional use) RHUE-6AHN RHUE-3AVHN RHUE-4AVHN...
Page 50: Field Minimum Wire Sizes For The Power Source
Y20A Y20B Y52CS Y52C Electrical wiring PCN7 PCN6 Service Manual Y52CS Y52C Y20L  note LED1 LED2 LED3 LED4 The heater and the 3-way valve are accessories. (Their codes are EH61 and VID3V1 respectively). LED6 R113 SEG2 RSW2 SEG1 RSW1 Refer to chapter "4"...
Page 51: Main Switches And Fuses
Electrical wiring Service Manual 3.2.2. Main switches and fuses Select the main switches (current breaker) according to the next table: Model Power source (Earth leakage Breaker) (Circuit Break) (A) (number of poles/A/mA) RHUE-3AVHN RHUE-4AVHN 1~ 230V 50Hz 2/40/30 RHUE-5AVHN RHUE-6AVHN RHUE-5AHN 3N~ 400V 50Hz 4/40/30...
Page 52 Electrical wiring Service Manual • dIP switch factory set for all units: rHUE-3AVHn rHUE-4AVHn rHUE-5AVHn rHUE-5AHn rHUE-6AVHn rHUE-6AHn DSW1 DSW2 DSW3 DSW4 1 2 3 4 5 7 1 2 3 4 5 7 1 2 3 4 5 7 1 2 3 4 5 7 1 2 3 4 5 7 1 2 3 4 5 7...
Page 53 Electrical wiring Service Manual • dSW2: unit control configuration / unit HP function Set PIns function Set PIns Pulse signal commissioning 3HP unit Remote ON/OFF signal Level signal (System controller) 4HP unit (Not used) 5 HP unit PHEX flow direction Counter flow (Yutaki) 6 HP unit •...
Page 54 Electrical wiring Service Manual • dSW5: H-lInK available / settings function Set PIns Not used Not used • dSW6: end resistance / fuse recovery function Set PIns Not used Not used • dSW7: unit control configuration function Set PIns Three phase Single phase Not used Inverter compresor...
Page 55: Led Indication
Electrical wiring Service Manual ● Jumper lead setting (JP2): Automatic restart after power failure Keep the same status as before. Setting before shipment: 0 = open; 1 = Short circuit The function selection using the jumper lead setting is shown in the table below. Setting function details Enable If this function is 'Enable', in case of power failure the unit will restart automatically once the power is recovered Disable 3.4.
Page 56: Accessories Electrical Installation
Electrical wiring Service Manual 3.5. ACCESSorIES ElECTrICAl InSTAllATIon 3.5.1. Pump kit Yutaki is controlling the pump by itself. The pump kits A or B must be always connected according to the wiring below: To pump Only for TOP-S 25/10 Model Protection type (Cut-out) Connection terminals TOP-S 25/7...
Page 57 Earth screw terminal is used for both pump and power supply wiring connection. Install a pump accordingly to the necessary supply water delivery. Hitachi recomends the use of accessory pump kits A or B. For TOP-S 25/10, connect wires from WSK to terminal 2 and 16 in the terminal board (TB2).
Page 58 Electrical wiring Service Manual  note The motor may become damaged by overvoltage. Before applying voltage to the motor, double-check the voltage. Connect to the mains and connect the SK 602/ SK 622 and SK-C2 tripping unit (observe rating plate data) in accordance with the switching diagrams (Fig.
Page 59: Weh- Water Electric Heater
Electrical wiring Service Manual 3.5.2. WEH- Water Electric Heater General check ¡ Ensure that the field-supplied electrical components (main 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. Electrical connection must be done by professional installers. Make sure that the power supply voltage is within +/-10% of the rated voltage.
Page 60 Electrical wiring Service Manual Alimentation/Supply 3N~400V 50 Hz (3N~/N) Alimentation/Supply 1~230V 50Hz (1~/N) 230V 230 V LPSW System Controller System Controller NO COM Output 1 (1~230V 50Hz) Output 2 (1~230V 50Hz) Immersion heater System Controller System Controller Terminal Block A (outputs) Ref.
Page 61: Dhwt- Domestic Hot Water Tank
Electrical wiring Service Manual 3.5.3. dHWT- domestic Hot Water Tank General check ¡ 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. Electrical connection must be done by professional installer. Check to ensure that the power supply voltage is within +/-10% of the rated voltage.
Page 62 Electrical wiring Service Manual Electrical wiring connection ¡ The electrical wiring connection between DHWT, AquaFREE or Yutaki system controller and the electrical power installation is as follows: Customer connection: Wire size ¡ Recommended minimum sizes for field provided Power source Control cable size cable size Power Max. Model Source Current (number of poles/A/mA) En60 335-1 En60 335-1 DHWT 1˜ 230V 50Hz 2,5mm²...
Page 63 Electrical wiring Service Manual 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 Electrical Heater LED1: POWER ON LED2: AUTO MODE ON LED3: Electrical Heater Manual Terminal Board L/N/T Power supply...
Page 64 Electrical wiring Service Manual Internal wiring ¡ Internal Wiring Connection Power cable Control EH 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 protection unit, comprising magnesium sacrifice anodes, charge gauges and wiring of connection.
Page 65 Titan 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 potentiostat (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...
Page 66 Electrical wiring Service Manual -To earth: connection (6), U shaped terminal. -To the potentiostat: connections at (9) and (10), pins (7) and (8) respectively.  note Use original wires only. To avoid any risk of corrosion due to reverse polarity do not lengthen nor shorten the wires. Use a socket base near to the storage heater for this purpose.The protective anode starts comes into operation when the storage heater is full of water.
Page 67: Electrical Wiring Diagrams
Metal protective casing  Screws M6  Panel  Screws M4  Wires  Earth Wire 3.6. ElECTrICAl WIrInG dIAGrAMS This sub-chapter shows the electrical wiring diagram for each unit of the Yutaki series. SMGB0066 rev.0 - 12/2009 Accessories electrical installation...
Page 68: Electrical Wiring Diagram For Models Rhue-(3~6)Avhn
Electrical wiring Service Manual SMGB0066 rev.0 - 12/2009 Electrical wiring diagram for models RHUE-(3~6)AVHN...
Page 69: Electrical Wiring Diagram For Rhue-(5/6)Ahn
Electrical wiring Service Manual SMGB0066 rev.0 - 12/2009 Electrical wiring diagram for RHUE-(5/6)AHN...
Page 71: Control System
Controller pack Service Manual ConTrollEr PACK This chapter presents the control system flowcharts for the Yutaki series. ConTEnTS 4.1. System configuration, settings and control system ..............73 4.1.1. Description .............................73 4.1.2. System controller overview ........................73 4.1.3. Contents of the controller pack ......................74 4.1.4. Quick-start installation steps ........................74 4.1.5. Abbreviations & terminology ........................75 4.1.6. Application configurations ........................75 4.1.7. Principle of bi-valent or mono-energetic operation .................76 4.1.8.
Page 72 Controller pack Service Manual 4.6. Boiler control functions ........................95 4.6.1. Boiler Control............................95 4.6.2. Supply-Return Difference Check ......................96 4.6.3. Boiler Minimum On / Off Times ......................97 4.6.4. Boiler Waiting Time ..........................97 4.6.5. Maximum Outdoor Temperature for Boiler Operation ................97 4.7. Electric heater control functions ....................98 4.7.1.
Page 73 Controller pack Service Manual 4.16. Electrical wiring ......................... 113 4.16.1. Wiring access ports ..........................113 4.16.1. Wiring connections ..........................114 4.16.2 System component connections ......................115 4.17. System configurations ....................... 118 4.18. User interface ..........................123 4.18.1. Display..............................123 4.18.2. Controls ..............................123 4.19. Installation configuration settings ....................124 4.19.1.
Page 74 Controller pack Service Manual 4.23. Device control system .......................143 4.24. Yutaki unit PCB .........................144 4.25. Safety and control device setting ....................145 4.25.1. Defrost operation control ........................147 4.25.2. Control of expansion valve ........................149 SMGB0066 rev.0 - 12/2009 Contents...
Page 75: System Configuration, Settings And Control System
If the unit is modified in any way, except by the manufacturer, all warranties concerning operation and safety are invalidated. Make sure that local standards and regulations are respected at all times. Use only accessory equipment that comes from or has been approved by Honeywell or Hitachi.  caution Electrical hazard.
Page 76: Contents Of The Controller Pack
Controller pack Service Manual 4.1.3. Contents of the controller pack - System Controller • Controls the heat pump. • Controls other system components. • Measures system sensors. System Controller • Allows system configuration and settings. - System MMI Pack • R oom Unit - The user interface for the system and allows time / temperature profile programming. • R F Receiver - Receives wireless signals from the Room Room Unit RF Receiver Unit and is wired directly to the System Controller.
Page 77: Abbreviations & Terminology
Controller pack Service Manual 4.1.5. Abbreviations & terminology TSUP Mono-Valent One heating source (electric Heat Pump) Supply Water Temperature Mono-Energetic TrET One energy source (electric Heat Pump and electric heater) Return Water Temperature Bi-Valent TdHW Two heating sources (electric Heat Pump and gas/oil Boiler) DHW Temperature TExT Outside Temperature Compensated Control...
Page 78: Principle Of Bi-Valent Or Mono-Energetic Operation
Controller pack Service Manual • dHW Storage The System Controller can be used in a system which has a DHW storage tank, with either a diverting valve or pump. If the system has a separate DHW pump, then a hydraulic separator or buffer tank has to be used to ensure proper hydraulic balancing of the system. The DHW system type is selected by an installer parameter (P1) • Buffer Tank or Hydraulic Separator When a hydraulic separator or buffer tank is used in CONF 1 & 2, the system will contain a secondary pump on the distribution side of the separator/buffer. In this case it is necessary to set installer parameter P2 to 1. In bi-valent systems (CONF 3,4,5) a hydraulic separator or buffer tank is always needed.
Page 79: Mono-Valent Systems (Conf 1)
Controller pack Service Manual CONF 4 Bi-Valent Series System The boiler is used to top-up the energy required for the system, but when the heat pump is outside it’s operating limits, the boiler will provide all of the heating requirements. Heating Zone Boiler Boiler Only Heat Pump Heat Pump Only 20ºC outside Temp. ºC Boiler and Heat Heat Pump Pump operate Boiler operates operates alone together when...
Page 80: Mono-Energetic Systems (Conf 2)
Controller pack Service Manual • Example Mono-Valent System with DHW. Hydraulic separator or buffer tank. Secondary pump for heating system. DHW controlled by separate pump. Auxiliary DHW electric heater. CONF=1 Mono-valent system P1=2 DHW pump P2=1 Secondary pump 4.1.9. Mono-Energetic Systems (Conf 2) •...
Page 81: Bi-Valent Systems - Parallel Operation (Conf3)
Controller pack Service Manual • Example Mono-Energetic System with DHW. Hydraulic separator or buffer tank. Secondary pump for heating system. DHW controlled by separate pump. Auxiliary DHW electric heater. CONF=1 Mono-energetic system P1=2 DHW pump P2=1 Secondary pump 4.1.10. Bi-valent Systems - Parallel operation (Conf3) •...
Page 82: Bi-Valent System - Parallel Operation - Mixing Loop (Conf 4)
Controller pack Service Manual 4.1.11. Bi-Valent System - Parallel operation - Mixing loop (Conf 4) • Summary This is a bivalent system where the boiler is configured in parallel with the heat pump. A hydraulic separator or buffer tank has to be used to ensure proper hydraulic balancing. This system is recommended for retrofit (upgrade) applications where an existing gas/oil boiler will be retained to provide the full heating requirements on the coldest days of the year. •...
Page 83: Supply Setpoint Calculation
Controller pack Service Manual • Example Bi-Valent System with DHW. Serial operation with bypass/mixing valve. DHW controlled by separate pump. Hydraulic separator or buffer tank. CONF=5 Bi-Valent Parallel system P1=2 DHW pump 4.2. SUPPly SETPoInT CAlCUlATIon • Calculation The System Controller uses the “zone of greatest demand” strategy for calculating the supply water temperature required from the Heat Pump (and/or 3-stage electric heater or boiler).
Page 84: Heating Control Functions
Controller pack Service Manual Zone 1 Zone 2 Devices controlled by the Devices controlled by the System Controller Extension Controler • Example Heating zone 1 requires 50°C (calculated from OTC heating curve) Heating zone 2 requires 35°C (calculated by extension controller) DHW loading not required S1 = 50°C, S2 = 35°C, SDHW = 0°C Therefore SSUP = maximum of (50°C, 35°C, 0°C) = 50°C...
Page 85: Room Setpoint Parallel Shift
Controller pack Service Manual The heating curve should be selected according to the local climatic conditions, building structure and type of heating distribution system. The gradient of the heating curve describes the relation between the change in the supply temperature and the change in outside temperature. In the case of large heating surfaces (and therefore low supply temperatures) like floor heating systems the heating characteristic curve is less steep compared to smaller heating surfaces (eg radiators). Typically a well-insulated, modern building with underfloor heating would use a heating curve value of 0.4-0.6 and one with radiator heating a value of around 1.6.
Page 86: Room Temperature Compensation
Controller pack Service Manual 4.3.2.2. room Temperature Compensation • function If room compensation is enabled, the calculated OTC supply setpoint is adjusted based on the difference between room temperature and room setpoint in order to reduce the room error. The amount of room influence can be adjusted by the room temperature compensation factor setting. • Parameter Setting P7 Room Compensation Factor (default value 2) To increase or decrease the amount of room compensation, adjust the room compensation factor. A higher value will give more priority to the room temperature error, and a lower value will mean the controller follows more closely the selected heating curve. • Example P7 = 2, SR1 (room setpoint) = 20, TR1 (room temperature) = 23 => S1 (supply setpoint) reduced by 2 * (23 – 20) = 6K •...
Page 87: Heating Circuit (Secondary) Pump
Controller pack Service Manual 4.3.4. Heating Circuit (Secondary) Pump • function When the heating circuit is enabled, the secondary pump will be switched on. When the heating circuit is disabled, the secondary pump is switched off after a pump overrun time. If the screed function is activated or system frost protection is active, the secondary pump continues to run. If the system uses a DHW diverting valve and DHW storage tank loading is active, then the secondary pump continues to run, since it is also used for the DHW loading. • Parameter Settings P2 Secondary Pump Selection (default 0 – no secondary pump) P3 Pump Overrun Time (default 2 min) •...
Page 88: Dhw Control
Controller pack Service Manual Heating Heating Circuit Circuit Circuit Circuit DHW diverting valve system DHW pumped system • function The DHW function has priority over the Heating Circuit, which means that when the DHW storage tank is being loaded, the heating circuit will be switched off. The DHW function will be blocked (temporarily disabled) when the Tariff/Timer input is configured for DHW and the input is open circuit (or alternatively short circuit as defined by parameter – see “DHW Time Program”). • Parameter Settings P1 System DHW Choice (default 0) P1=0 No DHW function P1=1 System with DHW diverting valve P1=2...
Page 89: Maximum Dhw Loading Time
Controller pack Service Manual • Parameter Settings P10 DHW setpoint (default 45°C) P11 DHW differential (default 5K) P12 DHW supply offset (default 10K) • Configuration Specific CONF 1,2: H eat Pump heats the DHW storage tank directly. If the storage tank also has an internal DHW electric heater this can also be used if necessary. CONF 2: T he 3-stage electric heater cannot be used for DHW loading. When DHW loading starts, the 3-stage electric heater is switched off.
Page 90: Dhw Electric Heater
Controller pack Service Manual • Parameter Setting P27 Maximum allowed DHW loading time (default 1.5hr)  note After the DHW loading has stopped, the DHW electric heater (if connected) will continue to be enabled until the DHW setpoint temperature is reached •...
Page 91: Using The Boiler For Dhw Loading
Controller pack Service Manual Situation 2: The Heat Pump is used to heat the DHW tank to the temperature DSET_HP. Then P10 > dSET_HP the DHW electric heater is switched on to heat the DHW tank to the temperature DSET. With slow reductions in DHW temperature, the DHW electric heater is switched on again when the DHW temperature falls below DSET minus P11.
Page 92: Using The Boiler For Dhw Loading
Controller pack Service Manual 4.4.5. Using the Boiler for dHW loading • Configuration Specific Applies only to configurations CONF 3,5 • function The boiler may also be used to raise the temperature of the DHW tank if the Heat Pump is not able to reach the DHW supply setpoint by itself. The boiler will only start after a time delay defined by parameter P19 (waiting time for boiler) in order to allow the Heat Pump time to satisfy the DHW loading demand by itself.
Page 93: Heatpump Control Functions
Controller pack Service Manual • diagram • Parameter Setting P24 Configuration of Tariff/Timer Input (default 4) open Circuit on terminals 10/11 Closed Circuit on terminals 10/11 Tariff/Timer input is ignored Tariff/Timer input is used for Heat Pump blocking Tariff/Timer input is used for Heat Pump blocking DHW is blocked DHW is enabled DHW is enabled...
Page 94: Heatpump Setting Control Signal
Controller pack Service Manual 4.5.2. Heatpump Setting Control Signal • function When there is a demand for heating or DHW, the System Controller will send to the heat pump a signal for the required Heat Pump outlet temperature. The System controller uses the 4-20mA connection to represent the outlet water temperature setpoint. The heatpump will modulate the appliance according to its own control strategy to achieve the correct output water temperature.
Page 95: Heatpump Maximum Return High Limit
Engineering Parameters (EP) are only available for service engineers. 4.5.5. Heatpump operating limits • function Heat Pump operation is only possible within certain temperature ranges as defined below. Parameters are provided in order to adjust the working area if required to do so by Hitachi. The Heat Pump water temperature setting sent by the System Controller is always constrained to lie between the maximum and minimum limits defined by the operating limits. If the outdoor temperature is below -20°C (P14 in Config 3,4,5 / EP14 in Config 1,2), the heat pump will always be switched off. •...
Page 96: Tariff Switch (Heat Pump Blocking) Input
Controller pack Service Manual • Parameter Settings P14 / EP14 Heat Pump minimum outdoor temperature (default -20°C) EP28 Heat Pump minimum supply temperature below outdoor temperature of EP32 (default 35°C) EP29 Heat Pump maximum supply temperature above outdoor temperature of EP34 (default 55°C) EP32 Heat Pump minimum supply inflexion point (default 0°C) EP33...
Page 97: Boiler Control Functions
Controller pack Service Manual 4.6. BoIlEr ConTrol fUnCTIonS 4.6.1. Boiler Control • Configuration Specific Boiler control is available only in configurations 3,4,5 (CONF3, CONF 4, CONF5) • function The boiler control decides whether to switch the boiler on or off based on a proportional plus integral action (P+I) control algorithm and the difference between the Boiler Setpoint and the Supply Water Temperature (TSUP). The boiler will only be used when the outdoor temperature is below the bivalence point (maximum outdoor temperature for boiler operation) or the boiler has been manually released (after a heat pump fault).
Page 98: Supply-Return Difference Check
Controller pack Service Manual • Parameter Settings Integral Factor Required Load - Boiler/Electric Heater Control (default 2.5 %/Kmin.) EP16 Proportional Band Required Load - Boiler/Electric Heater Control (default 6 K/100%) EP31 Supply Setpoint Control Offset (default 4 K) It is not normally recommended to change these parameters. They have been selected during laboratory tests for best performance in most situations.
Page 99: Boiler Minimum On / Off Times
Controller pack Service Manual 4.6.3. Boiler Minimum on / off Times • function In order to prevent inefficient short-cycling of the boiler, this function prevents the boiler from switching on or switching off until either the boiler minimum off time or boiler minimum on time, respectively, has elapsed. • Parameter Settings P17 Boiler minimum ON time (default 2 min.) P18 Boiler minimum OFF time (default 5 min.) High values of minimum ON and OFF times may cause large fluctuations in water temperature and should usually be avoided.
Page 100: Electric Heater Control Functions
Controller pack Service Manual • Parameter Setting P15 Maximum Outdoor Temperature for Boiler Operation (default 0°C) • Enable/disable To disable this function and allow boiler operation at all outdoor temperatures, set the parameter P15=OFF.  note The boiler is always available for DHW loading, independent of outdoor temperature. 4.7. ElECTrIC HEATEr ConTrol fUnCTIonS 4.7.1. Electric Heater Control •...
Page 101: Supply-Return Difference Check
Controller pack Service Manual If Supply Setpoint > Heat Pump maximum supply temperature – Heat Pump Sensor Offset + 0.5K, then Electric Heater Setpoint = Supply Setpoint (SSUP) If Supply Setpoint < Heat Pump maximum supply temperature – Heat Pump Sensor Offset - 0.5K, then Electric Heater Setpoint = Supply Setpoint (SSUP) – Supply Setpoint Control Offset (EP31) The heat pump maximum supply temperature depends on the outdoor temperature and the heat pump operating limits. •...
Page 102: Electric Heater Waiting Time
Controller pack Service Manual • Enable/disable This function can be disabled by setting parameter P32=OFF. • Parameter Settings P32 Supply-Return Difference Limit (default 3K) A high value will prevent the electric heater switching on until a large temperature difference is seen by the System Controller. With a low value or with the function disabled, the electric heater may start more often, for example during defrost cycles.
Page 103: Maximum Outdoor Temperature For Electrical Heater Operation
Controller pack Service Manual • Parameter Settings P33 Return Temperature Limit Offset (default OFF) • Special note It is highly recommended for CONF 2, that the parameter P33 is not left in the default OFF state. Recommended setting is 5K. • Enable/ disable This function can be disabled by setting the parameter P33=OFF. 4.7.5.
Page 104: Mixing / Bypass Valve Control
Controller pack Service Manual 4.8.2. Mixing / Bypass Valve Control • Configuration Specific This function only applies to configuration 5 (CONF 5) • function When the boiler is switched on, the mixing valve control is enabled and operates in the same manner as described above (Mixing Valve Control). When the boiler is switched off, and the difference between the supply water temperature (TSUP) and mixed supply temperature (TMIX) is small (less than EP3), the mixing valve is always closed (by-pass operation) so that the hot supply water from the heat Pump does not circulate through the boiler heat exchanger, which may cause unnecessary heat loss and reduction in system efficiency. While the water from the boiler (TSUP) is much hotter than the mixed supply temperature (TSUP), the mixing control continues to operate. • Parameter Setting P9 Mixing Valve Runtime (default 120 sec) EP3 Difference Supply water temperature (default 1.5K) The value for EP3 has been chosen based on laboratory tests and it is not recommended to change it.
Page 105: General Functions
Controller pack Service Manual • function With some boilers, especially oil boilers, there is a risk of unwanted liquid condensation on the gas side of the boiler heat exchanger if the temperature falls below the water condensation temperature. This can cause reduced boiler life. In these situations, it is desirable to allow the boiler heat exchanger to warm up before the heating circuit water is circulated through the heat exchanger. This function prevents the mixing valve opening until after the boiler has been switched on for a set period of time (parameter P35).
Page 106: Pump And Valve Seizure Protection
Controller pack Service Manual 4.9.3. Pump and Valve Seizure Protection • function The System Controller has an anti-seize protection function for valves and pumps which helps to prevent these components sticking during long periods of inactivity. Every 24hrs the components which have not been used will be run for a short period.
Page 107: Parameter Tables
Controller pack Service Manual 4.10. PArAMETEr TABlES 4.10.1 Installer Parameters • Setting Instructions Please refer to the System Controller Installation & Operation Manual for instructions on how to set the installer parameters. Parameter Conf description Step default Set according to the type of hydraulic CONF System Configuration 12345 configuration installed.
Page 108: Engineering Parameters
Controller pack Service Manual Parameter Conf description Step default Sets the maximum time allowed for DHW Maximum allowed loading. After this time, if the DHW setpoint is not DHW loading time 123-5 1.5 hr achieved, the controller will nevertheless return to (not available if P1=0) heating. Disables the heating in Zone 1 if the OTC No-load function enable 12345 calculated supply setpoint falls below the room...
Page 109 Controller pack Service Manual Parameter Conf description Step default Mixing Valve Integral Mixing Valve Control: the integral reset factor of ---45 20.0 2.5 %/Kmin Factor the P+I control algorithm. Integral Factor Electric Heater or Boiler Control: the integral -2345 20.0 2.5 %K/min Required Load reset factor of the P+I control algorithm.
Page 110: Conversion Table: Heat Pump Supply Temperature To Ma
Controller pack Service Manual 4.11. ConVErSIon TABlE: HEAT PUMP SUPPly TEMPErATUrE To mA The following table converts the Heat Pump supply temperature setting in °C to current (I) in mA. Setting (°C) Setting (°C) Setting (°C) 2.0 ≤ I < 2.2 15.5 8.1 ≤ I < 8.4 29.0 14.1 ≤ I < 14.3 42.0 2.2 ≤ I < 2.4...
Page 111: Technical Data
Controller pack Service Manual 4.13. TECHnICAl dATA 4.13.1. System Controller (xEK23232 A) Power supply 230Vac +10%, -15%, 50Hz Power Consumption Max 5VA Ambient operating 0 to 50°C Temperature Storage Temperature -20 to 55°C Humidity 0 to 90% RH non-condensing dimensions 121 x 161.5 x 46mm (WxHxD) Material Base PA-GF 25-FR Material Cover...
Page 112: Mounting
Controller pack Service Manual 4.14. MoUnTInG The System Controller is designed to be mounted either directly onto the wall or on a DIN-rail.  caution Incorrect wall mounting. Reduction of the IP protection degree. Perform the installation of the System Controller without damaging the unit.
Page 113: Mounting On A Din-Rail
Controller pack Service Manual - For wire entry, remove the appropriate break-outs in the mounting box (B). Use screws (max diameter 4mm) and wall plugs suitable for the wall material (not included in the delivery). 4.14.3. Mounting on a dIn-rail The system controller can easily be clicked on to a DIN-rail via the locating clips on both sides of the mounting base. Hold the system controller at an angle, and hook onto the top of the DIN-rail.
Page 114: Outside Temperature Sensor
Controller pack Service Manual 4.15.2. outside Temperature Sensor • location of device The most important rule for locating the Outdoor Temperature Sensor is that it should have the same temperature, wind, and solar conditions as the occupied rooms. In most cases, the Outdoor Temperature Sensor is to be mounted on the coldest side of the building (N–NW side) so as not to be affected by direct sunshine. This is to ensure that it will be warm enough in each room of the house.
Page 115: Electrical Wiring
Controller pack Service Manual 4.16. ElECTrICAl WIrInG  caution Electrical hazard. Can cause serious injuries or death. Do not connect or adjust any wiring or connections unless the main power switch is OFF. Make sure that all the power sources are switched OFF. Isolate the mains power supply before installing the System Controller.
Page 116: Wiring Connections
Controller pack Service Manual 4.16.1. Wiring connections  caution Static electricity. Malfunction.The electronic components within the System Controller are susceptible to damage caused by static electricity. When handling the device: Do not touch internal components. Touch an earthed piece of metal to discharge static electricity from your body. Incorret wiring.
Page 117: System Component Connections
Controller pack Service Manual 4.16.2 System component connections • Heat pump The System Controller controls the heat pump outlet water temperature by a 4-20mA signal. When there is no demand for the heat pump to be on, the System Controller directly switches the heat pump off. The heat pump can signal to the System Controller when it has a fault so that a fault code can be displayed and appropriate action taken. TERMINAL BLOCK A TERMINAL BLOCK C...
Page 118 Controller pack Service Manual • Mixing valve In a mixing system (CONF 4,5), the mixing valve is controlled to maintain the required supply temperature. Set the parameter (P9) according to the running time of the actuator used. P9 Actuator Run Time for Mixing Valve TERMINAL BLOCK A Close Open Mixing Valve • Secondary pump The secondary pump is the circulating pump for the main heating loop. In mono-valent and mono-energetic systems (CONF 1, 2), a secondary pump is only required if a hydraulic separator or buffer tank is used and in this case it is necessary to set the parameter (P2) to 1. Before the heating is switched off, the pump continues to run for a short time - pump overrun time (P3) –...
Page 119 Controller pack Service Manual TERMINAL BLOCK A Boiler ON/OFF • dHW time clock It is possible to connect an external time clock to the System Controller to provide time-of-day switching of the DHW storage. The input can be configured so that heating of the DHW storage tank is blocked (disabled) on either an open circuit or closed circuit condition. P24 Configuration of Tariff/Timer Input Note that the Tariff/Timer input (terminals 10 & 11) can be used for DHW Time Switching OR Tariff-Switching, not both. open Circuit on terminals 10/11 Closed Circuit on terminals 10/11 Tariff/Timer Input is ignored Tariff/Timer input is used for Heat Pump blocking...
Page 120: System Configurations
Controller pack Service Manual TERMINAL T MIX BLOCK C TERMINAL T DHW BLOCK C T RET TERMINAL T SUP BLOCK C T EXT 4.17. SySTEM ConfIGUrATIonS Mono-valent systems ‘conf 1’ ¡ The Heat Pump is sized to provide 100% of the heating requirements on the coldest day of the year. Used in new builds or in boiler-replacement applications.
Page 121 Controller pack Service Manual ● dHW electric heater The system controller can switch a DHW storage electric heater to achive higher DHW temperatures. The electric heater should have its own thermostat set to a higher value than the DHW setpoint of the system controller. Please take care about the type of DHW storage tank fitted and the position of the electric heater.
Page 122 Controller pack Service Manual ● dHW electric heater The system controller can switch a DHW storage electric heater to achive higher DHW temperatures. The electric heater should have its own thermostat set to a higher value than the DHW setpoint of the system controller. Terminal block C (inputs) Terminal block A (outputs) Terminal block B (Power Supply)
Page 123 Controller pack Service Manual Terminal block C (inputs) Terminal block A (outputs) Terminal block B (Power Supply) Heat pump 4-20mA control output Tariff/ Timer input DHW Sensor T DHW RF Receiver Heat pump fault Return sensor T RET Supply sensor T SUP Outdoor sensor T EXT...
Page 124 Controller pack Service Manual Bi-Valent system - serial operation ‘conf 5’ ¡ This system is recommended for retrofit (upgrade) applications where an existing gas/oil boiler will be retained to provide the full heating requirements on the coldest days of the year. • Direct OTC controlled heating loop - Direct loop when heat pump operating on it´s own mixing circuit when boiler operating • Sequence control of boiler and heat pump • Optional DHW storage with diverting valve or pump ●...
Page 125: User Interface
Controller pack Service Manual 4.18. USEr InTErfACE 4.18.1. display The display of the System Controller is simple to understand and has extra segments to indicate the operating mode, failures and status. Frost Protection Symbol Displayed when the frost protection feature is active. Heat Pump Symbol Indicates that the Heat Pump is switched on by the controller. Boiler Symbol Displayed when the boiler (bi-valent system) is switched on to provide additional heating. Electric Heater Symbol Displayed when the electric heater (mono-energetic system) is switched on to provide additional heating.
Page 126: Installation Configuration Settings
Controller pack Service Manual Set button • Used to enter setting mode • Used to accept new value for a parameter. Info button • Used to enter Operational Data Display mode. • Used to select next operational data item Pressing particular combinations of these buttons will allow display or alteration of the various operating parameters. 4.19. InSTAllATIon ConfIGUrATIon SETTInGS The configuration of the System Controller is performed using the 5 buttons on the front cover. Via these buttons, a simple menu structure can be accessed to adjust all the controller parameters. All menus use the 4 characters in the left of the display to show an abbreviated name, and the three digits in the right for the value. Units are shown in the far right of the display next to the value. If no button is pressed for 10 minutes, the display will return to the default menu, or the relevant fault code.
Page 127: Installer Parameter List
Controller pack Service Manual 4.19.2. Installer parameter list Parameter Conf description Step default Setting CONF System configuration 12345 Set according to the type of hydraulic configuration installed DHW configuration 123-5 Set to 0=No DHW, 1=DHW valve, 2=DHW pump Set to 1 if a buffer/hydraulic separator and a secondary pump Secondary pump 12--- is used (CONF 1 or CONF 2 only) Pump overrun time 12345 Sets how long the pumps run after the heating is switched off.
Page 128: System Testing
Controller pack Service Manual Parameter Conf description Step default Setting Return temperature Control parameter to prevent electric heater use when the -2345 then limit offset return temperature is too high for heat pump operation. DHW electric heater Sets the time to wait after starting to heat the DHW tank waiting time (not 12--- before enabling the special output for “DHW electric heater...
Page 129: Reviewing The Operational Data
Controller pack Service Manual 4.20.3. rEVIEWInG THE oPErATIonAl dATA The table below shows the values that are available to be viewed during Normal Operation mode. These can be shown by pressing the button Abbr. operational data Units Conf Normal Operation mode TEXT Outdoor temperature °C...
Page 130: Expanding The System
Controller pack Service Manual normal operation mode output display mode output Setting mode & > 1 sec. Output CONF Heat Pump setting (mA) 12345 Heat Pump remote on/off 12345 Secondary pump (not displayed if P2=0) 12345 DHWV DHW valve/pump (not shown if P1=0) 123-5 EHS1 Electric heater output 1...
Page 131: Binding Rf Components Together
Controller pack Service Manual Zone 2 Zone 1 Devices controlled by the Devices controlled by the System Controller Extension Controller 4.21.2. Binding rf components together The Room Unit and RF receiver included in the system pack are already factory configured to work together. If either of these units have to be replaced, please follow the instructions below for the method of binding RF components together. To enter the RF Binding procedure, press and hold the button on the RF Receiver for 5 seconds. The red LED will begin to flash. When binding the RF Receiver to the Room Unit, the System Controller display will show a flashing “ZONE 1”, meaning that the system will bind to the first heating zone by default. Zone 1 is the zone controlled directly by the System Controller. To bind Zone 2 (the extension system), press the + button on the System Controller. “ZONE 2” will be displayed, and the RF system will be bound to that zone. The bound zone can be changed by following the re-binding procedure on the RF Receiver/Room Unit and adjusting the zone selected on the System Controller display.
Page 132: Installation Information
Controller pack Service Manual  note The RF link between the Room Unit and RF Receiver in system packs is pre-configured at the factory and therefore should be installed at the same site. This makes the installation process fast and easy, but if products from individual system packs are separated, or mixed with other pre-configured system packs during installations please refer to the section Binding / Rebinding procedure to bind the desired units together and allow them to communicate with each other.
Page 133: Installing The Rf Receiver
Controller pack Service Manual 4.22.1.4. Installing the rf receiver  note The RF Receiver contains no user serviceable parts. It should be opened and installed by qualified installer only.  caution Static electricity. Malfunction. Do not touch the circuit board. ...
Page 134: Installing The Room Unit
Controller pack Service Manual 4.22.2. Installing the room Unit 4.22.2.1. Power up IInstalling the Batteries: Lift up the front cover of the Room Unit to reveal the battery cover and product controls. Remove the battery cover by pressing down and sliding out. Insert the 2 x AA LR6 Alkaline Batteries supplied with the Room Unit, ensuring the correct orientation.
Page 135: Locating The Room Unit
Controller pack Service Manual 4.22.2.3. locating the room Unit While still in the Test Mode, the Room Unit should be located taking the following into consideration and reviewing the illustrations below: Find a suitable location where the signal transmission is reliable. Reliable transmission is indicated when the RF Receiver is flashing the green LED every 6 seconds. Install the room Unit EITHER on the wall using the wall bracket OR attach the optional table stand as shown in below. Exit the Test Mode by pressing the button.
Page 136: Installer Mode
Controller pack Service Manual 4.22.4. Installer mode Installer Mode is used to alter the system settings for specific applications, to use the special features of the Room Unit in a different way or to alter the factory preset parameters. Parameters are divided into two groups: - Category 1 parameters – Room Unit Setup - Category 2 parameters – System Setup. (These are all listed in section Installer Parameters Table.). 4.22.4.1.
Page 137: Using The Room Unit For Specific Applications
Controller pack Service Manual 4.22.4.3. Using the room Unit for specific applications 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. Therefore, some of the system parameters within the Room Unit menu will not apply. Please also note other changes to the setting of the optimisation and proportional band settings as shown in the the next tables.
Page 138: Installer Parameters Table
Controller pack Service Manual 4.22.5. Installer parameters table 4.22.5.1. Category 1 - room Unit settings Parameter Parameter no. factory default Setting optional Setting Category 1 Parameters – Room Unit Settings Display Description Display Description AM-PM / 24hr 24 hr clock display 12 hr –...
Page 139: Category 2 - System Settings
Controller pack Service Manual 4.22.5.2. Category 2 - System settings  note To ensure correct heat pump system operation, parameter “8:Su” must be set correctly. See note in section Using the Room Unit for Specific Applications. Parameter Parameter no. factory default Setting optional Setting Category 2 Parameters –...
Page 140: Room Unit User Guide
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 Hitachi room unit to provide the highest home comfort with a minimum cost. • features • Ergonomic user interface featuring an ‘OK-button’.
Page 141: Setting-Up
Please follow the instructions in this section only if the Hitachi room unit screen is blank (no symbols or digits are displayed). If the room temperature is already displayed move on to Step 2: Setting the date and time.
Page 142: Programming
 note The built-in heating program has been designed to provide normal comfort requirements, but if you want to customise the settings please see the next section ‘Programming the Hitachi room unit’. 4.22.7.2. Programming • The built-in heating program The built-in heating program has 6 temperature level changes per day that can be set between 3.00am and 2.50am the...
Page 143 Controller pack Service Manual • Modifying the heating program To change the heating program: Press either of the PROGRAM buttons to enter the programming mode. The time / temperature settings for period 1 on Monday (Day 1) will be flashing as shown. The active period is highlighted by a flashing square around the numbers at the bottom of the screen and the selected day is shown with the day indicator. To adjust the period start time use the buttons, the ‘OK?’ indicator will be displayed to confirm the change.
Page 144: Operating
• OFF ( ) mode sets the Hitachi room unit to control to a minimum temperature setting of 5°C (default) that acts as a frost protection measure for your home.
Page 145: Device Control System
The Hitachi room unit will now control to the new temperature for the set number of days that your home is vacant. At midnight the holiday counter will be reduced by one until the selected number of days have passed. The Hitachi room unit...
Page 146: Yutaki Unit Pcb
Controller pack Service Manual 4.24. yUTAKI UnIT PCB • PCB drawing The PCB in the Yutaki unit operates with nine DIP switches, six LEDs and two rotary switches. The location is as follows: lEd indication function LED 1 Power supply indication LED 2 LED 3 LED 4 Operation status indication LED 5 Alarm indication LED 6 Setting mode indication 1. Status indication. Press the PSW2 more than three seconds to change the status display mode.
Page 147: Safety And Control Device Setting
Controller pack Service Manual 4.25. SAfETy And ConTrol dEVICE SETTInG ModEl rHUE3AVHn rHUE4AVHn rHUE5A(V)Hn rHUE6A(V)Hn for compressor Pressure switches Automatic Reset, Non-Adjustable (one per unit) -0.05 -0.05 -0.05 -0.05 4.15 4.15 4.15 4.15 HIGH Cut-Out -0.15 -0.15 -0.15 -0.15 Cut-In 3.20±0.15 3.20±0.15 3.20±0.15 3.20±0.15 Fuse 1~ 230V 50Hz 3N~ 400V 50Hz 2x20...
Page 148 Controller pack Service Manual The figure below shows the outline of the control system Thermistor for water inlet Thermistor for water outlet Wireless remote control switch Thermistor for outdoor temperature Multiple signals Thermistor for evaporation in heating Thermistor for evaporation in bolig Single signals Disharge gas thermistor Remote control MCU Suction gas thermistor Operation signals Suction gas pressue sensor...
Page 149: Defrost Operation Control
Controller pack Service Manual 4.25.1. defrost operation control  note Defrosting Conditions Fulfilled For desfrosting, operate at the compressor frequency shown in the defrosting flow chart (without applying upper/lower limit). Compressor Frequency Liquid injection shall be OFF at desfrosting. 40 Hz Output (*1) Compressor Real Frequency = 40 Hz? 60 sec passed 10 Sec Count...
Page 150 Controller pack Service Manual Defrosting Finish Conditions Fulfilled Fan: 25-step Operation (Full-speed) Pd ≤ 2.3 MPa ? 10 sec passed from fan 25-step? 4-way valve switching YDEF OFF Compressor Frequency 30 Hz Output (Order Frequency) 10 Sec Count Start Expansion Valve Startup Control I (Cold Start Opening) 50 Sec Count Shift to Expansion Valve...
Page 151: Control Of Expansion Valve
Controller pack Service Manual 4.25.2. Control of expansion valve Abasic flow for the expansion valve drive assuming long compressor operation time. See sections from the next page for details in each procedure (Details of Performance, Shifting Conditions). 1. Zero Reset Control F: INV (Compressor) Real Operation Frequency (Hz) Fo > 0 Fo: INV (Compressor) Order Frequency (Hz) Expansion Valve 100 Pulse F > 0 2. Startup Control I (operation with Fixed Opening) 7.
Page 152 Controller pack Service Manual • Zero reset Control The purpose of this control is to correct the discrepancy of opening, if any, before a trouble occurs in the refrigerant cycle. If first fully closes the expansion valve opening and then recovers to the predetermined opening. • Startup Control I (operation with fixed initial opening) Selects the initial opening by determining between hot start or cold start from the state of discharge gas temperature (Td) and outdoor air temperature (Ta) upon compressor startup. •...
Page 153: Available Optional Functions
Available Optional functions Service Manual AVAIlABlE oPTIonAl fUnCTIonS ConTEnTS 5.1. Freeze protection ........................152 5.2. Restart after power failure ......................152 5.3. Compressor ON/OFF control ....................153 5.4. 3 Minutes guard control ......................154 5.5. Power save mode........................154 SMGB0066 rev.0 - 12/2009 Contents...
Page 154: Freeze Protection
Available Optional functions Service Manual 5.1. frEEZE ProTECTIon Using setting point =1. The unit is controlling the pump in order to avoid water circuit freeze as the following graphic indicates: Yutaki water Intermitent 5’ ON / 50’ OFF temperature (Tw)(ºC) Permanent Ambient temperature (Ta)(ºC) When in operation in winter in the outdoor air temperature at 2 ºC or lower, the water pump operates to protect Yutaki unit...
Page 155: Compressor On/Off Control
Available Optional functions Service Manual • Jumper lead setting (JP2): Automatic restart after power failure Keep the same status as before. Setting before shipment: 0 = open; 1 = Short circuit The function selection using the jumper lead setting is shown in the table below. Setting function details Enable If this function is 'Enable', in case of power failure the unit will restart automatically once the power is recovered Disable 5.3.
Page 156: Minutes Guard Control
Available Optional functions Service Manual 5.4. 3 MInUTES GUArd ConTrol Compressor startup by thermo recovery shall always to ensure 3 minutes of compressor OFF status. However, the standard upon operation startup is 3 minutes but it can be, changed by the setting mode in the following chart. The time available for setting is 30 seconds, and by 1 minute between 1 and 10 minutes. This mode is activated by turning pin 3 of DSW1 to ON. Pressing PSW2 and PSW1 for more than three seconds at the same time allows changing from each item displayed. To finish changing to predetermined setting.
Page 157: Test Run
Test run Service Manual TEST rUn ConTEnTS 6.1. Checking procedure before the test run ..................156 6.2. Test run procedure for Yutaki ....................158 6.2.1. System controller testing ........................160 SMGB0066 rev.0 - 12/2009 Contents...
Page 158: Checking Procedure Before The Test Run
Test run Service Manual 6.1. CHECKInG ProCEdUrE BEforE THE TEST rUn When you have finished the installation, perform the test run according to the following procedure. After performing the test run, hand over the system to the customer. Perform the test run of the Yutaki one by one. Make sure that the electrical wiring and the refrigerant piping are correctly connected. You should perform the test run according to the “Test Run Procedure for Yutaki” on the next pages. ...
Page 159 Test run Service Manual • Check before start up Check that the hydraulic connections are tight. Check that water pressure is 1 bar minimum. - Check that the water flow is constant and that the purge of the circuit is correct. - Check that the protections and electrical connections are in line with the electrical patterns and this leaflet. Turning on the heat pump YUTAKI Turning on the electric heater EH 6 1. (If necessary) The power relays for heater are controlled by the Yutaki controller.
Page 160: Test Run Procedure For Yutaki
Test run Service Manual 6.2. TEST rUn ProCEdUrE for yUTAKI Overview Turning DSW1-2 ON sets the operation mode to be used during a test run. DIP switch can be set while the power source is ON. Details Behavior during Mode Setting Shifts to this mode when DSW1-2 is turned ON during unit stop.
Page 161 Test run Service Manual • Parameters check using 7-Segment Press PSW2 more than 3 seconds. Now you can consult the Yutaki parameters by pressing PSW2 (up) or PSW1 (down). Code (Upper side) Content Code (Upper side) Content Operation status  Liquid refrigerant temperature Evaporating temperature ...
Page 162: System Controller Testing
Test run Service Manual • High Pressure Cut Confirmation Flash PSW1+ PSW2 PSW1+ PSW2 Pd Display Stop Signal Flash PSW2 PSW1 Operation pressure display PSW1+ PSW2 Flash Stop Signal Pd Display Operation pressure display (Behavior) Ignore the pump interlock signal and operate the compressor For inverter model, Pd Retry and inverter protection by Pd are disabled.
Page 163 Test run Service Manual 6.2.1.2. System test Once the system has been installed, it is recommended that the following tests are carried out: Check that you have selected the correct configuration, and that the necessary installation parameters have been set. Check the wiring of the inputs and outputs. Use the procedure in 7.3 to view the temperature sensor values. It is possible to manually override the outputs to test the system operation. Check that the Room Unit is communicating with the RF Receiver. To do this, change the temperature setpoint on the Room Unit to the maximum or minimum value and check that the heat pump reacts appropriately.
Page 164 Test run Service Manual  note Operational data shown depends on the system configuration (CONF) setting. Zone 1 is the heating loop controlled by the System Controller. Zone 2 is the heating loop controlled by the Extension Controller. 6.2.1.4. Manually overriding the outputs This feature allows the status of the outputs to be changed in order to test the electrical connections.
Page 165 Test run Service Manual output Conf DHW electric heater enable (not shown DHWE 12--- if P1=0) Boiler pump --34 Boiler on/off --345 Mixing valve position (%) ---45  note Operational data shown depends on the system configuration (CONF) setting. SMGB0066 rev.0 - 12/2009 Test run procedure for Yutaki...
Page 167: Troubleshooting
Troubleshooting Service Manual TroUBlESHooTInG ConTEnTS 7.1. Initial troubleshooting ........................166 7.1.1. Unit and System controller - Power Supply failure ................166 7.1.2. Abnormal operation of the devices .......................168 7.1.3. Incidents of operation ...........................174 7.2. Troubleshooting procedure .......................175 7.2.1. Alarm code ............................177 7.3. Failure diagnosis method ......................216 7.4.
Page 168: Initial Troubleshooting
Troubleshooting Service Manual 7.1. InITIAl TroUBlESHooTInG 7.1.1. Unit and System controller - Power Supply failure • The lEd and the 7-segment display are not indicated. • not operated. If the fuses are blown out or a circuit breaker is activated, investigate the cause of the overcurrent and take the necessary action. Action (Turn off the main observed failure Cause Check item switch) Measure the voltage using a Power failure or power is not ON...
Page 169 Troubleshooting Service Manual Action observed failure Cause Check item (Turn off the main switch) Replace the cable or repair the System controller cable disconnected Connect the cable cable Check the connection of R,S One (or several) phase failure, or inverted phase order ("” alarm). Reorder the phases and T phase. Only in three phase unit. Turn the switch to “remote”...
Page 170: Abnormal Operation Of The Devices
Troubleshooting Service Manual 7.1.2. Abnormal operation of the devices Action observed failure Cause Check item (Turn off the main switch) clogging of the air side heat Remove the clogging exchanger? Obstacles at the inlet or the outlet of Remove the obstacles the airside heat exchanger Insufficient air flow to the heat exchanger...
Page 171 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action observed failure Cause Check item (Turn off the main switch) Clogging of the expansion Replace the expansion valve valve Clean or repair the Too much super-heat Clogging of the strainer strainer Malfunction or internal leakage of the 4-way...
Page 172 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action observed failure Cause Check item (Turn off the main switch) Check the water Insufficient water flow temperature difference Increase the water flow between inlet and outlet Check clogging of Too much refrigerant Remove the clogging discharge side pipe Clogging of the expansion Check clogging of...
Page 173 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action observed failure Cause Check item (Turn off the main switch) Failure compressor Check bearing seal state Replace the compressor bearing Replace the compressor Failure in the compressor Check insulation Over current compressor (option "replace the motor insulation resistance...
Page 174 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action observed failure Cause Check item (Turn off the main switch) Heating load is higher than heating capacity Check the heating load Install an adequate size unit Excessively low suction Check gas leakage & Charge correctly the Gas leakage pressure...
Page 175 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action observed failure Cause Check item (Turn off the main switch) Turn off the unit & check Non-condensable gas in Evacuate and charge the relation between the refrigerant cycle refrigerant again temperature and pressure Clogging of the high Check the clogging...
Page 176: Incidents Of Operation
Troubleshooting Service Manual 7.1.3. Incidents of operation The operation of the heater is bonded to the Yutaki heat pump. (If that is in default, the heater can be activated only if specific programming controller Yutaki is done). The heater can be activated by the controller Yutaki under request for additional power or temperature. In case of non-functioning heater should check: That signals to the heat pump function. That fuse protection heater in a state.
Page 177: Troubleshooting Procedure
Troubleshooting Service Manual 7.2. TroUBlESHooTInG ProCEdUrE ● Checking using the 7-segment display. 7-seg. display info. Upper side Lower side (See the following table for details) General Indication Content Proceeding Initialization Power ON (During unit stoppage) Pump Operation (During unit stoppage) U Waiting of pump feedback (During unit operation) U...
Page 178 Troubleshooting Service Manual Alarm code Content Activation of high pressure swicth ↔1 Activation of protection control for excessively high pressure ↔1 Activation of low pressure control ↔1 Excessively low pressure difference ↔1 Excessively high discharge gas temperature ↔1 Excessively low temperature of heating exchanger refrigerant inlet ↔1 Excessively low suction gas temperature ↔1...
Page 179: Alarm Code
Troubleshooting Service Manual 7.2.1. Alarm code Alarm code description  ↔  Activation of high pressure switch • The alarm code is displayed on the PCB´s display. – T his alarm code is displayed when the high pressure (Pd) is incresed to more than 4.15 MPa, and high pressure switch (63H) is activated. PCB monitoring position: PCB1, PCn5 (See next page) SMGB0066 rev.0 - 12/2009 Troubleshooting procedure...
Page 180 Troubleshooting Service Manual Is Securely Connected Wiring Check and Repair PCN´s on PCB1 and High (disconnecting wiring Error) pressure switch (63H)? Pull out connector PCN5, Check continuity of High Replace High Pressure Switch (63H) Pressure Switch (63H). Is continuity OK? Is alarm activated just Replace PCB after compressor running? Is high pressure switch (63H) activated? Replace High Pressure (Is Pd reached...
Page 181 Troubleshooting Service Manual Alarm code description  ↔  Activation of protection control for excessively high pressure • The alarm code is displayed on the PCB´s display. • D uring normal operation, ( in cooling o heating operation mode) the Electronic Control stops and restarts automatically after 3 minutes. • T he Stop alarm appears after 3 retries during 30 minutes. – T his alarm code is displayed when the high pressure (Pd) is incresed to more than 3.9 MPa, during 10 seconds in compressor running frequency more than 40 Hz or, – T his alarm code is displayed when the high pressure (Pd) is incresed to more than 3.5 MPa, during 10 seconds in compressor running frequency lees than 40 Hz. PCB monitoring position: PCB1, Cn4 retry code: P-12 Are connector CN4 on the...
Page 182 Troubleshooting Service Manual Alarm code description  ↔  Activation of low pressure control • The alarm code is displayed on the PCB´s display. • It appears The electronic control displays the alarm during the operation in heathing or cooling mode. – This alarm code is displayed when the suction pressure (Ps) is less than 0.1 MPa during 3 seconds. PCB monitoring position: PCB1, Cn3 Wiring Check Is connector CN3 on the (Breaking of wire, wrong...
Page 183 Troubleshooting Service Manual Alarm code description  ↔  Excessively low pressure difference • The alarm code is displayed on the PCB´s display. • T he compressor stops and restarts automatically in 3 minutes. • T he Stop alarm appears after 3 retries during 30 minutes. – This alarm code is displayed when the Pressure Ratio calculated from High Pressure "Pd" and Low Pressure "Ps"...
Page 184 Troubleshooting Service Manual Alarm code description  ↔  Excessively high discharge gas temperature • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the discharge gas temperature is increased to 120ºC and continues for 10 minutes. – T he discharge gas, temperature is increased over 140 ºC during more than 5 seconds. PCB monitoring position: PCB2, Cn15 Is connector CN15 on the Plug correctly and repair...
Page 185 Troubleshooting Service Manual Alarm code description  ↔  Excessively low temperature of heat exchanger refrigerant inlet • The alarm code is displayed on the PCB´s display. • T he compressor stops and restarts automatically in 3 minutes. • T he alarm appears after 3 retries during 30 minutes. – This alarm code is displayed when the Refrigerant temperature in water side heat exchanger inlet (Tp) is less than -6ºC during 3 seconds.
Page 186 Troubleshooting Service Manual Alarm code description  ↔  Excessively low suction gas temperature • The alarm code is displayed on the PCB´s display. • T he compressor stops and restarts automatically in 3 minutes. • T he alarm appears after 3 retries during 30 minutes. – This alarm code is displayed when the suction gas temperature (Ts) is lower than -5ºC during 10 seconds. (Only cooling operation).
Page 187 Troubleshooting Service Manual Alarm code description  Abnormal transmission between Inverter PCB and Main PCB • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the communication between Main PCB (PCB1) and Inverter (DIP- IPM/ISPM) is not performed correctly during 30 seconds. PCB monitoring position: PCB1, Cn8 Is wiring between CN8 of the PCB1 and CN2,6 on the...
Page 188 Troubleshooting Service Manual Alarm code description  Abnormality of Power Supply Phase • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the power source phases are reversely connected or one phase is not connected. PCB monitoring position: PCB1, PCn1 Is there any phase Connect correctly each phase unconnected? of the power source...
Page 189 Troubleshooting Service Manual Alarm code description Excessively low voltage or excessively high voltage for the inverter  rHUE-(3~6)AVHn • The alarm code is displayed on the PCB´s display. • T he alarm appears after 3 retries during 30 minutes. – T his alarm code is displayed when the voltage between terminal "P" and "N" of DIP-IPM is insufficient. retry code: P-18  warning Electrical hazard. Risk of electrical shock. Be extremely carefull because of the high voltage Restart the operation Check the wiring and the Is the Power Supply voltage...
Page 190 Troubleshooting Service Manual Alarm code description Excessively low voltage or excessively high voltage for the inverter  rHUE-(5/6)AHn • The alarm code is displayed on the PCB´s display of the outdoor unit. • T he alarm appears after 3 retries during 30 minutes. – T his alarm code is displayed when the voltage between terminal "P" and "N" of ISPM is insufficient. retry code: P-18  warning Electrical hazard. Risk of electrical shock. Be extremely carefull because of the high voltage Restart the operation Check the wiring and the Is the Power Supply voltage...
Page 191 Troubleshooting Service Manual Alarm code description failure of water inlet temperature thermistor • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the water inlet temperature thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn9 Is connector CN9 on PCB2 Wiring check, Repair.
Page 192 Troubleshooting Service Manual Alarm code description 1 failure of water outlet temperature thermistor • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the water outlet temperature thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn13 Is connector CN13 on Wiring check, Repair.
Page 193 Troubleshooting Service Manual Alarm code description 1 Activation of freeze protection control (water inlet) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the chilled water temperature is lower than 2ºC. PCB monitoring position: PCB2, Cn9 Wiring Check Is connector CN9 on the (Breaking of wire, wrong PCB2 correctly connected? wiring)
Page 194 Troubleshooting Service Manual Alarm code description  ↔ 1 Activation of freeze protection control (water outlet) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the chilled water temperature is lower than 2ºC. PCB monitoring position: PCB2, Cn13 Wiring Check Is connector CN13 on the (Breaking of wire, wrong PCB2 correctly connected?
Page 195 Troubleshooting Service Manual Alarm code description 1 Excessively high water temperature (compressor running) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the water temperature is above 59ºC during compressor operation. (Only heating operation). PCB monitoring position: PCB2, Cn9 (Water Inlet) PCB2, Cn13 (Water outlet) Are connectors CN9 and Wiring Check...
Page 196 Troubleshooting Service Manual Alarm code description  failure of refrigerant liquid temperature thermistor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn14 Is connector CN14 on Wiring check, Repair. PCB2 correctly connected? (Breaking of wire, wrong wiring) Are the connectors...
Page 197 Troubleshooting Service Manual Alarm code description  failure of ambiente temperature thermistor (open/short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn10 Is connector CN10 on Wiring check, Repair. PCB2 correctly connected? (Breaking of wire, wrong wiring) Are the connectors between PCB1 and PCB2...
Page 198 Troubleshooting Service Manual Alarm code description  failure of discharge gas temperature thermistor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn15 Is connector CN15 on Wiring check, Repair. PCB2 correctly connected? (Breaking of wire, wrong wiring) Are the connectors...
Page 199 Troubleshooting Service Manual Alarm code description  failure of refrigerant evaporating temperature thermistor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn12 Is connector CN12 on Wiring check, Repair. PCB2 correctly connected? (Breaking of wire, wrong wiring) Are the connectors between...
Page 200 Troubleshooting Service Manual Alarm code description  failure of suction gas temperature thermistor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the thermistor is short circuited or cut. PCB monitoring position: PCB2, Cn11 Is connector CN11 on Wiring check, Repair. PCB2 correctly connected? (Breaking of wire, wrong wiring) Are the connectors...
Page 201 Troubleshooting Service Manual Alarm code description  failure of discharge gas pressure sensor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the high pressure sensor is short circuited or cut. PCB monitoring position: PCB1, Cn4 Is the high pressure sensor correctly connected to Wiring check, Repair.
Page 202 Troubleshooting Service Manual Alarm code description 8 failure of suction gas pressure sensor (open/Short) • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when the low pressure sensor is short circuited or cut. PCB monitoring position: PCB1, Cn3 Is the low pressure sensor correctly connected to Wiring check, Repair.
Page 203 Troubleshooting Service Manual Alarm code description  Incorrect PCB Setting • The alarm code is displayed on the PCB´s display. – This alarm code is displayed when wrong settings are performed in DIP switches on PCB. Are the DIP switches on Turn OFF the power and set PCB1 correctly set? the DIP switches correctly (Refer to "Setting the Dip Switches")
Page 204 Troubleshooting Service Manual Alarm code description Transmission error between Main PCBs  (this alarm code is not available in this unit) • The alarm code is displayed on the PCB´s display. Are the DIP switches on Turn OFF the power and set PCB1 correctly set? the DIP switches correctly (Refer to "Setting the Dip Switches") Failure of PCB1 Replace PCB1...
Page 205 Troubleshooting Service Manual Alarm code description  Incorrect operation • The alarm code is displayed on the PCB´s display – This alarm code is displayed when wrong settings is performed in DIP switch on PCB or prohibited operation is performed. Is the setting of DIP switches Is the alarm activated just Turn OFF the power and set correct? after the Power Supply is the DIP switches correctly...
Page 206 Troubleshooting Service Manual Alarm code description  failure of the current sensor for "Inverter" (0 A detection) • The alarm code is displayed on the PCB´s display • T he compressor stops and restarts automatically in 3 minutes. • T he alarm appears after 3 retries during 30 minutes. – This alarm code is displayed when the frequency of the compressor is maintained at 15~18 Hz after the compressor is started, one of the absolute values of the running current at each phase U+, U-, V+ and V- is less than 1.5A (including 1.5A).
Page 207 Troubleshooting Service Manual Alarm code description  Activation of protection for inverter instantaneous over current (1) • The alarm code is displayed on the PCB´s display. • T he compressor stops and restarts automatically in 3 minutes. • T he alarm appears after 6 retries during 30 minutes. – This alarm code is displayed when the compressor current is higher than the set value. Totally 3 minutes during 10 minutes.
Page 208 Troubleshooting Service Manual Alarm code description  Activation of protection for inverter instantaneous over current (2) • The alarm code is displayed on the PCB´s display. • T he compressor stops and restarts automatically in 3 minutes. • T he alarm appears after 6 retries during 30 minutes. – This alarm code is displayed when the compressor current is higher than the set value. retry code: P-17 Turn off power, (Trip happen...
Page 209 Troubleshooting Service Manual Turn OFF power, diconnect U,V,W from compressor terminals and restart. Does the protecting function activate? Check ISPM or DIP-IPM Replace ISPM or DIP-IPM Has been there any Check compressor instantaneous drop of voltage? Check power supply and wiring capacity Replace ISPM or DIP-IPM *1): Turn ON the No.1 switch of the DIP switch on ISPM when restarting with disconnecting the terminals of the compressor. After troubleshooting, turn OFF the No.1 switch of the DIP switch on ISPM.
Page 210 Troubleshooting Service Manual Alarm code description  ISPM or dIP-IPM protection activation – IPM or Dip IPM have detecting function of abnormality. This alarm is indicated when the transistor module detect the abnormality 3 times in 30 minutes including 3. Retry operation is performed up to the occurrence of 2 times.
Page 211 Troubleshooting Service Manual Alarm code description  Increase in the inverter fin temperature • T he compressor stops when the temperature of the thermistor for inverter fin excess 100ºC, and restarts automatically in 3 minuntes. • T he alarm appears after 3 retries during 30 minutes. retry code: P-17 Replace the dipIPM or Is thermistor short circuit or Restart the operation. ISPM. *1) faulty? Does it trip soon? Replace the thermistor...
Page 212 Troubleshooting Service Manual Alarm code description  Abnormality of fan motor protector (dC fan motor) • T he fan motor is stopped once, and restarted after 10 seconds. This alarm code is displayed when the revolution pulse output detected from the fan motor is 10rpm or less. If it occurs more than 10 times in 30 minutes, this alarm is indicated.
Page 213 Troubleshooting Service Manual Alarm code description  no feed back signal from water pump • The alarm code is displayed on the PCB´s display. • It is available once feedback signal confirmed. – This alarm code is displayed when the Pump operation feedback signal (terminals 1-2) is OFF during pump interlock (CMp) ON (terminals 3-4). PCB monitoring position: PCB1, PCn4 Is thermal relay for pump Is 220-240V the voltage...
Page 214 Troubleshooting Service Manual Alarm code description  Cooler water failure (this alarm is not available in this unit) – This alarm code is displayed when the contact between #1 and #2 of CN6 is not closed. PCB monitoring position: PCB1, Cn6 Is the connector CN6 on Wiring check, Repair.
Page 215 Troubleshooting Service Manual Alarm code description  Condenser water failure (this alarm is not available in this unit) – This alarm code is displayed when the contact between #1 and #2 of CN7 is not closed. PCB monitoring position: PCB1, Cn7 Is the connector CN7 on Wiring check, repair.
Page 216 Troubleshooting Service Manual Alarm code description U Excessively high water temperature (compressor stop) (flickering) • W ater temperature is increased to 65ºC by heat generation in pump or other heat source during only pump running (during compressor stop: during thermo off or during pump automatic operation in winter). • I f water temperature is decreased less than 6ºC due to pump stop, it becomes normal status automatically. • S ince this is not an abnormality of unit, it is not saved in alarm history. When this alarm happen, check the water system first. If any cause can not be detected, check the unit according to the following procedure.
Page 217 Troubleshooting Service Manual Alarm code description ,b failure of fan motor • T his alarm is indicated when the revolution pulse output from the fan motor is the reverse revolution signal is detected. The fan motor is stopped once, and restarted after 10 seconds. If it occurs more than 10 times in 30 minutes, this alarm is indicated. Alarm code fan Motor  b Restart operation This alarm is indicated due to detected overcurrent by Does the motor run? the contrary wind. This is normal.
Page 218: Failure Diagnosis Method
Troubleshooting Service Manual 7.3. fAIlUrE dIAGnoSIS METHod ● General check of failure diagnosis. In the case of no segment indication, unit can not operate. Is 380-415V (3N~) or 220- Check the power 240V (1~) supplied source switch to the unit? Is 220-240V supplied to Is fuse broken? Replace fuse transformer primary side? Wiring check Is R phase or S and repair phase failure? Wiring check...
Page 219 Troubleshooting Service Manual Voltage test position: VCC12T VCC24/VCC05T VCC12 PSW2 PSW1 DSW2 DSW3 DSW4 VCC24 VCC05T DSW1 DSW5 DSW7 REG3 REG1 VCC12T REG2 VCC05 VCC12 DSW8 LED7 D6 D7 LED8 DSW9 GND2 DSW6 REG4 VCC24N GND1 CN7B CN14 CN15 C111 CN7A GND1 VCC24N...
Page 220: Checking Procedure For Main Parts
Troubleshooting Service Manual 7.4. CHECKInG ProCEdUrE for MAIn PArTS 7.4.1. rHUE-(3~6)AVHn. Procedure for checking the dIP-IPM. High voltage discharge is an imperative work for replacing parts.  warning DIP-IPM Electrical hazard. Risk of electrical shock. Perform this high voltage discharge work to avoid an electric shock. Turn OFF the main switches and wait for three minutes.
Page 221 Troubleshooting Service Manual Touch [+] of the tester to [P] of DIP-IPM (soldered part), and [-] to DIP-IPM U, V, W terminals to measure the resistance. Normal if all three terminals have 1 kΩ or greater. Contrary to [5], touch [-] of the tester to [P] of DIP-IPM (soldered part), and [+] to DIP-IPM U, V, W terminals to measure the resistance. Normal if all three terminals have 30 kΩ or greater. (Resistance gradually increases during measurement.) Touch [-] of the tester to [N] of ISPM (soldered part), and [+] to ISPM U, V, W terminals to measure the resistance. Normal if all three terminals have 1 kΩ or greater. Contrary to [7], touch [+] of the tester to [N] ofDIP-IPM (soldered part), and [-] to DIP-IPM U, V, W terminals to measure the resistance. Normal if all three terminals have 30 kΩ or greater. (Resistance gradually increases during measurement.) Contact with specified terminals Internal circuit of ACT part of inverter module to measure.
Page 222: Rhue-(5/6)Ahn. Procedure For Checking The Ispm
Troubleshooting Service Manual 7.4.2. rHUE-(5/6)AHn. Procedure for checking the ISPM. Remove all the terminals of the ISPM before check. If items (a) to (h) are performed and the results are satisfactory, ISPM is normal. Measure it under 1 kΩ range of a tester.  warning Electrical hazard. Risk of electrical shock. Perform the high voltage discharge procedure as described. Magnetic contactor Inverter module ISPM LED 201 Magnetic contactor Fuses...
Page 223 Troubleshooting Service Manual Checking the transistor module: By touching the + side of the tester to the P terminal of ISPM and the - side of the tester to U, V and W of ISPM, measure the resistance. If all the resistances are more than 1 kΩ, it is normal. By touching the - side of the tester to the P terminal of ISPM and the + side of the tester to U, V and W of ISPM, measure the resistance.
Page 224: Checking Capacitors Cb1 & Cb2
Troubleshooting Service Manual ● Checking the transistor module 1. By bonding +P to -UVW or -N to +UVW, no continuity and no variation on voltage drop should appear. 2. B y bonding -P to +UVW or +N to -UVW: continuity and variation on voltage drop (nearly 0,405) should be displayed, and the same value in all cases. Not the same value means that the diode module is damaged. 7.4.3. Checking capacitors CB1 & CB2.  danger Electrical hazard. Risk of serious injuries or death. Before installing the electrical wiring or before performing a periodical check, turn OFF the main switch of the unit.
Page 225: Fault Diagnosis Of Dc Fan Motor
Troubleshooting Service Manual In case that Mg. SW 52C (CMC1) is not ON, the compressor current will travel through these resistances, and they will be broken. Mg. SW 52C (CMC1) should be checked. Check the resistance between the primary and secondary terminal where the contact point is melted for Mg. SW 42C. If there is continuity, the contact is melted and 52C is broken (NG). Reactor resistance can be messured between TB3 and RB = 0,2Ω. Checking this component is not necessary.  note Noise filter does not affect ISPM directly, so is not necessary to check it when ISPM fails. Both digital or analog testers are valid to check the values.
Page 226 Troubleshooting Service Manual Measurement procedure Remove the fan motor connector from the control PCB, ISPM or DIP-IPM. Connect the black test lead of the tester to the black wire pin of the fan motor connector Connect the red test lead to the wire connector pin to be checked Results Observed values will be close to the normal values in the table Normal: below Observed values will be deviated from the normal values in the...
Page 227: Troubleshooting Of Control System
Troubleshooting Service Manual 7.5. TroUBlESHooTInG of ConTrol SySTEM 7.5.1. System controller • fault codes and diagnostics Fault codes are displayed in the default display as “FAUL 1” to “FAUL 13”. The table below describes the meaning of the fault code, the behaviour of the system during that fault condition and suggested remedial action to solve the problem. Code fault description System Behaviour remedy...
Page 228: System Mmi Pack
Wrong electrical connection. Call the installer to check the electrical connections Hook the Hitachi room unit back on the wall bracket or replace The red LED on the RF communication lost due to the wrong the Hitachi room unit on the table stand in the position where receiver located next to location of the Hitachi room unit.
Page 229: Troubleshooting Of Accessories
Troubleshooting Service Manual 7.6. TroUBlESHooTInG of ACCESSorIES 7.6.1. Pump kit Problem Cause remedy There is air in the unit. Vent the unit. The unit is making noises The pump volume rate is too strong. Decrease the pump output by switching to a lower speed. The pump lift is too high.
Page 230: Weh - Water Electric Heater
Troubleshooting Service Manual 7.6.2. WEH - Water Electric Heater observed failure Cause Check item Action Terminals 7, 8, 9 from System Controller Check connections between System connected to Terminals 7, 8, 9 WEH Controller and WEH respectively Check Voltage (230V) between Control signals from Systems Controls Check Power Supply in System terminals 8/9 and 8/7 in WEH and also miss-connected or wrongly connected Controller in System Controller...
Page 231 Spare parts Service Manual SPArE PArTS ConTEnTS 8.1. Spare parts of Yutaki .........................230 8.1.1. Cycle and estructural parts ........................230 8.1.2. Electrical parts ............................231 8.2. Spare parts of accessories ......................233 8.2.1. WEH - Water Electric Heater ........................233 8.2.2. DHWT - Domestic Hot Water Tank .......................234 SMGB0066 rev.0 - 12/2009 Contents...
Page 232: Spare Parts Of Yutaki
Spare parts Service Manual 8.1. SPArE PArTS of yUTAKI 8.1.1. Cycle and estructural parts rHUE-(3~6)A(V)Hn ¡ SMGB0066 rev.0 - 12/2009 Spare parts of Yutaki...
Page 233: Electrical Parts
Spare parts Service Manual 8.1.2. Electrical parts rHUE-(3~6)AVHn ¡ C110 Q203 Q204 CP21 CP22 C208 C105 C109 CP13 R112 CP19 C108 LED201 C104 CP14 CP23 Lot No. C100 R113 R109 R114 CP18 CP15 LED202 CP27 R110 CP25 CP10 CP11 CP24 CP12 CP30 CP29...
Page 234 Spare parts Service Manual rHUE-(5/6)AHn ¡ PCN5 PCN4 PCN10 PCN1 PCN2 PCN3A CN10A CN10B PCN3B REG7 R135 REG4 DSW6 PCN11 CN13 CN12 CN11 SMGB0066 rev.0 - 12/2009 Spare parts of Yutaki...
Page 235: Spare Parts Of Accessories
Spare parts Service Manual 8.2. SPArE PArTS of ACCESSorIES 8.2.1. WEH - Water Electric Heater LOCATION OF SPARE PARTS IN THE UNIT FOR MODEL: WEH-6E LOCATION OF ELECTRICAL EQUIPMENT IN THE ELECTRICAL BOX No. DESCRIPTION REMARKS CONTACTOR AS09-30-10-26M (20A AC1) PRESSURE SWITCH XP600 (1 bar set) THERMOSTAT...
Page 236: Dhwt - Domestic Hot Water Tank
Spare parts Service Manual 8.2.2. dHWT - domestic Hot Water Tank SMGB0066 rev.0 - 12/2009 Spare parts of Yutaki...
Page 237 Spare parts Service Manual DESCRIPTION REMARKS Side Cover Thermometer Green LED Power ON Orange LED Automatic ON Red LED Manual ON Relay 220/240 VAC Bipolar Switch Switch (Auto/Manual) Thermostat External Covering External Covering Side Mouth Seal Upper Mouth Seal Anode Load Meter Panel Control KIT E-Box Assembly Upper Side KIT...
Page 239 Servicing Service Manual SErVICInG ConTEnTS 9.1. RHUE-(3~6)A(V)HN ........................239 9.1.1. Removing service cover ........................239 9.1.2. Removing air outlet grille ........................239 9.1.3. Removing upper cover .........................240 9.1.4. Removing the lower part of service panel and rear panel ..............240 9.1.5. Removing Yutaki fan motor .........................241 9.1.7.
Page 240 Servicing Service Manual  danger Electrical hazard. Risk of death. Before performing any of the service operations described in this chapter, turn all the main switches off and place security lockers or convenient warning indicators in order to prevent them from turning on accidentally. Check and be sure that the LED201 (Red) on the inverter PCB is OFF for all electrical maintenance.
Page 241: Rhue-(3~6)A(V)Hn
Servicing Service Manual 9.1. rHUE-(3~6)A(V)Hn 9.1.1. removing service cover Screw Remove the main parts according to the following procedures.  note Screws are represented as black points in the figure besides.To reassemble, perform the procedures in reverse. To prevent contamination of the refrigerant with water or foreign particles, do not expose open pipes to atmosphere for long periods.
Page 242: Removing Upper Cover
Servicing Service Manual 9.1.3. removing upper cover Upper cover Remove the nine (9) screws fixing the upper cover Lift the upper cover upwards. 9.1.4. removing the lower part of service panel and rear panel Remove the four (4) fixing screws at the lower part of the service panel and remove the lower part of the service panel by pulling towards the front side. Remove the fixing screws of the rear panel and remove the rear panel.
Page 243: Removing Yutaki Fan Motor
Servicing Service Manual 9.1.5. removing yutaki fan motor Remove the service cover according to the section “Removing service cover” in this chapter. Remove the air outlet grille according to the section “Removing air outlet grille” in this chapter. Remove the upper cover according to the section “Removing upper cover”...
Page 244: Removing The Compressor
Servicing Service Manual 9.1.6. Mounting yutaki fan motor  note Remove the service cover according to the section When assembling the motor, ensure the cables section directly downwards. Fix the protection tube edge end “Removing service cover” in this chapter. downwards to ensure water from keeping inside it Fix the motor wires onto the motor clamp with a cable tie to Remove the air outlet grille according to the section...
Page 245 Servicing Service Manual Thermistor holder Holder Thermistor Thermistor fixing plate Rubber cap Th Thermistor Indication of terminal number Terminal box cover Compressor Compressor wires Details for compressor terminals Compressor Fix it with screw wires (3 wires)   note warning Do not expose the refrigerant cycle to the atmosphere Flamable objects.
Page 246 Servicing Service Manual Remove the crankcase heater.(Oil heater on the lower Reassemble the parts in the reverse order of the case). indicated removing procedures. Tighten the screws (U, V and W) for compressor Remove the suction pipe and the discharge pipe wires with 2.5N.m. from the compressor. Isolate the wires and electrical Fix the lead wire firmly.
Page 247: Removing High Pressure Switch
Servicing Service Manual 9.1.8. removing high pressure switch Remove the service cover according to the section “Removing service cover” in this chapter. High pressure switch structure Collect the refrigerant from the check joint according to the section “Removing the compressor” in this chapter. Contact point Pressure detection Disconnect the faston terminals from the pressure switch.
Page 248: Opening Electrical Box (P-Mounting Plate)
Servicing Service Manual 9.1.9. opening electrical box (P-mounting plate) Remove the service cover according to the section “Removing the service cover” in this chapter. Remove the five (5) screws fixing the electrical box. Open the P-mounting plate by rotating it 90 degrees to the left.  danger Electrical hazard.
Page 249: Removing The Coils For The Reversing And Solenoid Valves
Servicing Service Manual 9.1.10. removing the coils for the reversing and solenoid valves Remove the service cover according to the section “Removing service cover” in this chapter. Remove the reversing and solenoids valve coils by removing the screw fixing the coil.  warning Electrical hazard. Risk of electrical shock. Do not touch the electrical components when the LED201 (Red) located on the inverter module is ON in order to avoid electrical shock.
Page 250: Removing Electronic Expansion Valve Coils
Servicing Service Manual 9.1.11. removing electronic expansion valve coils Remove the service cover according to the section “Removing service cover”.  danger Electrical hazard. Risk of death. Check that the LED201 (red) located on the inverter module is OFF when opening the P-mounting plate. Do not touch the electrical components when LED201 (Red) located on the inverter module is ON in order to avoid an electrical shock.
Page 251: Removing Pressure Switches
Servicing Service Manual 9.1.12. removing pressure switches Pressure switches Remove the service cover according to the section “Removing service cover” in this chapter. There are two pressure switches: one green (low pressure) and one black (high pressure). Remove the pressure switches ...
Page 252: Removing Reversing Valve
Servicing Service Manual 9.1.13. removing reversing valve Perform the brazing with a blowtorchto remove and reassemble the reversing valve by cooling the pipes Remove the service cover and the rear service panel first with wet cloth in order to avoid brazing material according to the section “Removing Service Cover” entering the reversing valve.
Page 253: Removing Solenoid Valve
Servicing Service Manual 9.1.15. removing solenoid valve Remove the flare nuts with two spanners to avoid twisting. Remove the service cover and the rear service panel according to the sections “Removing Service Cover” Reassemble the parts in the reverse order of removing and “Removing lower part of service panel and rear order of removing procedures.
Page 254: Removing Electrical Components
Servicing Service Manual 9.1.16. removing electrical components Remove the service cover according to the section “Removing Service Cover” in this chapter. Disconnect all the wires connected to the relay  danger PCB. Electrical hazard. Risk of death. Check that the LED201 (red) located on the inverter module is OFF when opening the P-mounting plate.
Page 255: Removing Inverter Components
Servicing Service Manual 9.1.17. removing inverter components  warning Remove the service cover according to the section Electrical hazard. Risk of electrical shock.Do not touch the electrical parts when LED201 (Red) located on the inverter “Removing service cover” in this chapter. module is ON to prevent from an electrical shock.
Page 256: Removing The Ispm
Servicing Service Manual 9.1.18. removing the ISPM  note The ISPM is equiped in the RHUE-(5/6)AHN unit. Several hazards. Risk of malfunction. Identify the terminal numbers with mark band. When reassembling, the terminals have to be connected to the  danger correct numbers .
Page 257: Removing The Dip-Ipm
Servicing Service Manual 9.1.19. removing the dIP-IPM  note The DIP-IPM is equiped in the RHUE-(3~6)AVHN units. Several hazards. Risk of malfunction. Identify the terminal numbers with mark band. When reassembling, the terminals have to be connected to the  danger correct numbers .
Page 258: Removing The Electrical-Noise Filter
Servicing Service Manual 9.1.20. removing the electrical-noise filter All RHUE Yutaki units are equiped with electrical-noise filter PCB.  danger Electrical hazard. Risk of death. Check that the LED201 (red) located on the inverter module is OFF when opening the P-mounting plate. Do not touch the electrical components when LED201 (Red) located on the inverter module is ON in order to Extraction of the PCB from the holders...
Page 259: Removing Other Electrical Components
Servicing Service Manual 9.1.21. 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)”...
Page 262 SMGB0066 rev.0 - 12/2009 - Printed in Spain...

This manual is also suitable for:

Rhue-3avhn Rhue-4avhn Rhue-5a(v)hn Rhue-6a(v)hn

Hitachi YUTAKI Series Service Manual

General Index 0

Units Installation

Water Pipe Installation

General Notes

Piping Work Connection Considerations

Water Control

Water Check Valve

Accessories Hydraulic Installation

Electrical Wiring Connections and Diagram

General Check

Electrical Wiring Connection

Setting the DIP Switches

LED Indication

Accessories Electrical Installation

Electrical Wiring Diagrams

Controller Pack

4 Control System

System Configuration, Settings And Control System

Supply Setpoint Calculation

Heating Control Functions

DHW Control Functions

Heatpump Control Functions

Boiler Control Functions

Electric Heater Control Functions

Mixing Valve Control Functions

General Functions

Parameter Tables

Conversion Table: Heat Pump Supply Temperature to Ma

R Resistance Tables

Technical Data

Mounting

Mounting the Sensors

Electrical Wiring

System Configurations

User Interface

Installation Configuration Settings

System Testing

Expanding the System

System MMI Pack (Room Unit and RF Receiver)

Device Control System

Yutaki Unit PCB

Safety and Control Device Setting

Available Optional Functions

Troubleshooting

Initial Troubleshooting

Troubleshooting Procedure

Failure Diagnosis Method

Checking Procedure for Main Parts

Troubleshooting of Control System

Troubleshooting of Accessories

Spare Parts of Yutaki/Spare Parts of Accessories

Servicing

Quick Links

Chapters

Troubleshooting

Related Manuals for Hitachi YUTAKI Series

Summary of Contents for Hitachi YUTAKI Series