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Hitachi RAC-25WXD Service Manual
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Hitachi RAC-25WXD Service Manual

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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-25WXD
RAC-35WXD
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT (W)
TOTAL AMPERES (A)
COOLING
(KW)
CAPACITY
(B.T.U./h)
TOTAL INPUT (W
TOTAL AMPERES (A)
HEATING
(KW)
CAPACITY
(B.T.U./h)
W
DIMENSIONS
H
(mm)
D
NET WEIGHT
(Kg)
ROOM AIR CONDITIONER
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
RAC-50WXD
OUTDOOR UNIT
RAC-25W
XD
1 PHASE,50Hz,220-230V
481 (250 1,000)
2.92-2.79
2.50 (0.90 3.10)
8,530 (3,070 10,580)
593 (250 1,200)
2.73-2.61
3.20 (0.90 4.20)
10,920 (3,070 14,330)
792(+65)
600
299(+27.5)
37.5
OUTDOOR UNIT
1
JCH-WH
NO.0112E
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------- 9
MAIN PARTS COMPONENT --------------------------------------------------- 11
WIRING DIAGRAM ---------------------------------------------------------------- 13
BLOCK DIAGRAM ----------------------------------------------------------------- 16
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 17
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------19
SERVICE CALL Q & A -----------------------------------------------------------28
TROUBLE SHOOTING ------------------------------------------------------------32
PARTS LIST AND DIAGRAM ---------------------------------------------------45
DC INVERTER
OUTDOOR UNIT
RAC-35W
XD
1 PHASE,50Hz,220-230V
814 (250 1,400)
3.74-3.57
3.50 (0.90 4.00)
11,940 (3,070 13,650)
800 (250 1,600)
3.67-3.51
4.00 (0.90 4.80)
14,330 (3,070 16,380)
792(+65)
600
299(+27.5)
37.5
OUTDOOR UNIT
RAC-50W
XD
1 PHASE,50Hz,220-230V
1,397 (500 2,100)
6.36-6.09
5.00 (1.90 5.20)
17,060 (6,480 17,740)
1,415 (500 2,700)
6.44-6.16
5.80 (2.20 7.00)
20,470 (7,510 24,910)
800(+63)
736
350(+35.5)
51
After installation

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Summary of Contents for Hitachi RAC-25WXD

  • Page 1: Table Of Contents

    5.80 (2.20 7.00) (KW) CAPACITY 10,920 (3,070 14,330) 14,330 (3,070 16,380) 20,470 (7,510 24,910) (B.T.U./h) 792(+65) 792(+65) 800(+63) DIMENSIONS (mm) 299(+27.5) 299(+27.5) 350(+35.5) NET WEIGHT (Kg) 37.5 37.5 After installation ROOM AIR CONDITIONER OUTDOOR UNIT Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
  • Page 2 6$)(7< '85,1* 5(3$,5 :25.  ,Q RUGHU WR GLVDVVHPEOH DQG UHSDLU WKH XQLW LQ TXHVWLRQ EH VXUH WR GLVFRQQHFW WKH SRZHU FRUG SOXJ IURP WKH SRZHU RXWOHW EHIRUH VWDUWLQJ WKH ZRUN  ,I LW LV QHFHVVDU\ WR UHSODFH DQ\ SDUWV WKH\ VKRXOG EH UHSODFHG ZLWK UHVSHFWLYH JHQXLQH SDUWV IRU WKH XQLW DQG WKH UHSODFHPHQW PXVW EH HIIHFWHG LQ FRUUHFW PDQQHU DFFRUGLQJ WR WKH LQVWUXFWLRQV LQ WKH 6HUYLFH 0DQXDO RI WKH XQLW ,I WKH FRQWDFWV RI HOHFWULFDO...
  • Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufactures during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned.) 2.
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of Al. stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1MΩ(1/2W) Staple Earth wire Fig.3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate...
  • Page 5 CAUTION In quiet or stop operation, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and turn off the circuit breaker for safety. In the event of power failure,the room air conditioner will restare automatically in the previously selected mode once the power is restored.

  • Page 6: Specifications

    SPECIFICATIONS...
  • Page 7 Figure showing the installation of Outdoor unit MODEL RAC-25WXD RAC-35WXD The refrigerating machine oil is easily affected by moisture. Use caution to prevent water from entering the cycle. The difference in height between above 200mm the indoor and outdoor unit should be kept below 10m.
  • Page 8 Figure showing the installation of lndoor and Outdoor unit MODEL RAC-50WXD The refrigerating machine oil is easily affected by moisture. Use caution to prevent water from entering the cycle. The difference in height between the indoor and outdoor unit should be kept below 10m. above 200mm The connecting pipe, no matter big or small, should all be...

  • Page 9: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-25/35WXD OUTDOORUNIT Unit : mm (27) Drain hole Drain hole Drain hole More than NOTE: 1.For outdoor unit installation , allow at least 2 sides of space around the unit ensure ventilation flue. 2.The connecting pipe , should all the insulated with insulation pipe. 3.Piping length is within 20m.
  • Page 10 CONSTRUCTION AND DIMENSIONAL DIAGRAM Unit : mm MODEL RAC-50WXD OUTDOOR UNIT 408.5 202.5 880.5 (35.5) (23) 111.5 543.5 More More than than NOTE: 1.For outdoor unit installation , allow at least 2 sides of space around the unit ensure ventilation flue. 2.The connecting pipe , should all the insulated with insulation pipe.

  • Page 11: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) FAN MOTOR Fan Motor Specifications MODEL RAC-25/35/50WXD WHT(V) CONNECTION RED(U) BLK(W) BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED BLK : BLACK PNK : PINK VIO : VIOLET...
  • Page 12 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-25/35WXD RAC-50WXD GSD102UKQA6JT6A GTD141UKQA8JT6 COMPRESSOR TYPE POWER SOURCE 220 - 350 V 220 - 350 V OUTPUT 1400W 790W WHITE YELLOW 2M= 1.354 2M= 1.354 RAC-25/35/50WXD CAUTION When the refrigerating cycle has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerating machine oil inside the compressor.

  • Page 13: Wiring Diagram

    WIRING DIAGRAM MODEL RAC-25/35/50WXD...
  • Page 14 MODEL RAC-25/35/50WXD...

  • Page 15: Block Diagram

    BLOCK DIAGRAM MODEL RAC-25/35/50WXD Power source OUTDOOR UNIT Compressor Power circuit drive circuit Indoor unit Compressor Indoor / Outdoor motor interface circuit Control power circuit Outdoor DC fan motor Reset circuit drive circuit Outdoor Fan motor Overheat thermistor Defrost thermistor Reversing valve drive circuit Outdoor temperature...
  • Page 16 MODEL RAC-25/35WXD COOLING CYCLE OUTDOOR UNIT Silencer Indoor unit Silencer Silencer HEATING CYCLE OUTDOOR UNIT Silencer Indoor unit Silencer Silencer...

  • Page 17: Refrigerating Cycle Diagram

    MODEL RAC-50WXD COOLING CYCLE OUTDOOR UNIT Silencer Indoor unit Silencer Silencer HEATING CYCLE OUTDOOR UNIT Silencer Indoor unit Silencer Silencer...

  • Page 18: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly OUTDOOR UNIT MODEL RAC-50WXD OUTDOOR UNIT MODEL RAC-25/35WXD 1. Electrical parts 1. Electrical parts (1)Remove the service value cover lock screws (1)Remove the service value cover lock screws and lower the cover to remove it. and lower the cover to remove it.

  • Page 19: Description Of Main Circuit Operation

    300-330...
  • Page 20 C021-C023,500 ,450V) 33 ACT R249 IP CUT 300-330...
  • Page 21 2. Power circuit (Low voltage) Fig. 2-1 The 230V AC voltage is rectified to DC voltage (B-12V,16V,12V,5V) pass through switching control IC (ICI), switching transformer. (1) B-12V Power supply for electrical expansion valve. (2) 16V Power supply for IPM driver circuit of compressor and fan motor, IGBT action. (3) 12V Power supply for 4 way valve relay, power relay, inrush current relay,motor current amplification, (4) 5V...
  • Page 22 Main parts 001,C002,C003,C004,C005,C011,C013,C014，NF1 1,2,5,8. DC/DC convertor IC (DC12V DC5V). L105 (JUMPER) D110 (EARTH) L104 (JUMPER) 0.5V D110 (EARTH) L103 (JUMPER) 15.5 1.5V D110 (EARTH) 1.0V R418 B-12V Expansion valve B-12V O/P 2.5V 1 “ - ” 1.0V...
  • Page 23 4. Reversing valve (4-way valve) control circuit ・This model is equipped with a reversing valve ※Voltage measurement timing (4-way Valve). ・The reversing valve (4-way Valve) "slides" the Forced cooling switch (Test switch) valve in the specified direction for each operating mode and switches the route of Reversing valve refrigerant and holds the route with a built-in (4-way Valve)
  • Page 24 HIC P.W.B 70 74 75...
  • Page 25 6. Electric expansion valve circuit...
  • Page 26 2A Fuse DC300 -330V...
  • Page 27 30 60 ( DC300-330V )

  • Page 28: Service Call Q

    SERVICE CALL Q&A Cooling operation The compressor sometimes Cooling when the room Check if the heat stops during cooling. temperature is low may exchanger of the indoor cause the heat exchanger unit is covered with dew. of the indoor unit to gather Wait for 3 to 4 minutes dew.
  • Page 29 Common, etc. In "automatic wind speed" mode, the In wind speed "automatic" mode, This does not abnormal. It indoor fan changes from strong wind the product will sense the heat is because the cold wind to weak wind to slight wind. exchange temperature and, prevention is working.
  • Page 30 Wireless remote control The timer will not become set. Have you set the product to the current time? The timer cannot be set unless it is set to the current time. The current time When set to the current The current time display will disappears 10 seconds time setting, the reading disappear at once.
  • Page 31 This occurs when the room temperature and humidity I set the "sleep" timer during have reached their settings during dehumidification and operation.But the air-conditioner is in a pause. The product will begin the indoor fan will not run (it will again to run within about 3 minutes.

  • Page 32: Trouble Shooting

    TROUBLE SHOOTING MODEL RAC-25/35/50WXD Inspection instructions RAC-25/35/50WXD Indoor fan motor Power supply Indoor Electrical Outdoor Electrical 1Φ 230V 50Hz Compressor motor Warning 0V line Note that the 0 V line of the outdoor electrical parts and Control circuit Control circuit the primary power circuit of the indoor electrical parts have voltages to ground as...
  • Page 33 DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT WARNING Caution Voltage of about 350 V is charged between the terminal of smoothing capacitors. During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing capacitors.
  • Page 34 Other instructions (1) Detaching and reattaching the receptacles for tab terminal All the receptacles for connecting tab terminals are with a locking mechanism. Forcibly pulling any such receptacle without unlocking it will destroy it. Be on guard. When reconnecting it, insert it securely all the way home. ・Receptacle types and how to unlock them Mild resin cover Cancel button...
  • Page 35 Troubleshooting support Function ・The failure mode detected on the outdoor unit side is displayed by blinking the "LD301". Detecting a failure will stop the outdoor unit [Display on the and keep blinking the LD301 until it is restarted. outdoor unit side] (The communication error will persist until the communication is reestablished.) ・The failure modes detected on the indoor and outdoor unit sides...
  • Page 36 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-25/35/50WXD...
  • Page 37 After turning on the power, perform air purification by remote control. If there is not the air purifier and operating function,setting to 32 by the remote control,and operate in the cooling mode. Is there 230V AC between Is the LD301 turned on? Ensure the power supply.
  • Page 38 Check the blinking frequency of the LD301. The LD301 blinks 13 times. Replace the outdoor electrical parts (in the case of an abnormality in the EEPROM reading error microcomputer or EEPROM). Abnormal The LD301 blinks 9 times. Check the F cable connection (for half insertion, connection by Correct the F cable connection.
  • Page 39 The LD301 blinks 10 times. AC 187 V or less, AC 253 V or more Is there AC 220 -230V between Check the power supply. terminal boards L and N? Power supply voltage error AC 187-253 V Ifyon confirm the connect of the reactor Abnormal Is there a voltage of DC 264-358 V ? wire, And it is ok, please change the...
  • Page 40 When cooling: Is the heat exchanger of the outdoor unit clogged up? Is there shelter around? The LD301 blinks 5 times. When heating: Is the heat exchanger or filter of the indoor unit Since the compressor Clear up the causation load was heavy, the clogged up? Overload lower limit cut...
  • Page 41 Abnormal The creepage breaker have already set? The LD301 blinks 14 times Change the compressor and then Does the compressor insulation OK? check the outdoor ele. unit . Active voltage abnormal Normal Change the outdoor ele. unit. Q601,Q602 (RAC-50WPB only) have malfunction Change the outdoor ele.
  • Page 42 (JUDGING BETWEEN GAS LEAKAGE AND CHECKING THE REFRIGERATING CYCLE COMPRESSOR DEFECTIVE) 1. Troubleshooting procedure (No operation, No heating, No cooling) Lighting mode Blinks Blinks Blinks Blinks Blinks Blinks Connect U,V,W phase leads to the Self- 2 times 3 times 4 times 5 times 6 times 8times...
  • Page 43 How to run the product with the outdoor unit test switch If the indoor electrical parts is out of order and if you wish to run the outdoor unit 1. Turn on the outdoor terminal boards L and N (220-230 V AC). 2.
  • Page 44 Cautions 1. Applying power directly to the outdoor unit will cause a rush current to stress the outdoor unit. Therefore, if the indoor unit is not out of order, do not use the method descried in 2). 2. Before making the connections, be sure to turn off the breaker. 3.

  • Page 45: Parts List And Diagram

    PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL: RAC-25WXD、RAC-35WXD...
  • Page 46 OUTDOOR UNIT J C H - W H P A R T S N O Q ' T Y / P A R T S N A M E U N I T R A C - 2 5 W X D R A C - 3 5 W X D HWRAC-50WPC A01 BASE...
  • Page 47 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL: RAC-50WXD...
  • Page 48 OUTDOOR UNIT JCH-WH PARTS NO Q'TY/ PARTS NAME UNIT RAC-50WXD HWRAC-50WXD A01 BASE HWRAC-50WXD A02 COMPRESSOR HWRAC-50WEC A08 SOUND PROOF HWRAC-50NX2 A04 PUSH NUT HWRAC-50WXD A03 CONDENSER HWRAC-50WXD A04 REVERSING VALVE HWRAC-50WEA A05 SERVICE VALVE HWRAC-50WEA A06 SERVICE VALVE HWRAC-50WED A03 ELECTRIC EXPANSION VALVE HWRAC-50WXD A05 SOUND PROOF...
  • Page 49 RAC-25WXD JCH-WH NO.0112E RAC-35WXD RAC-50WXD...

This manual is also suitable for:

Rac-35wxdRac-50wxd

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