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Hitachi RAC-18WED Service Manual

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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-18WED
RAC-25WED
RAC-35WED
RAC-50WED
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)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
INDOOR UNIT
RAK-18PED
RAK-25PED
RAK-35PED
RAK-50PED
RAK-25PEDC
RAK-35PEDC
RAK-50PEDC
L.H
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
RAK-25PED
RAK-18PED
RAC-18WED
RAK-25PEDC
1
P
H
A
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
580 (
250
1,010)
3.19-3.05
2.00 (0.90 2.50)
6,820 (3,070 8,530)
620 (250 970)
3.62-3.46
2.50 (0.90 3.20)
8,530 (3,070 10,920)
780
660(+60)
280
530
215
278(+55)
7.5
23
INDOOR UNIT + OUTDOOR UNIT
JCH-WH
RAK-18PED/RAC-18WED
RAK-25PED/RAC-25WED
RAK-35PED/RAC-35WED
RAK-50PED/RAC-50WED
RAK-25PEDC/RAC-25WED
RAK-35PEDC/RAC-35WED
RAK-50PEDC/RAC-50WED
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ----------------------------------------------------------------------- 9
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 18
MAIN PARTS COMPONENT --------------------------------------------------- 21
WIRING DIAGRAM ---------------------------------------------------------------- 23
CIRCUIT DIAGRAM --------------------------------------------------------------- 25
BLOCK DIAGRAM ----------------------------------------------------------------- 30
BASIC MODE ----------------------------------------------------------------------- 31
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 41
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 47
TROUBLE SHOOTING ----------------------------------------------------------- 77
PARTS LIST AND DIAGRAM --------------------------------------------------10
DC INVERTER
OUTDOOR UNIT
INDOOR UNIT
RAK-35PED
RAC-25WED
RAK-35PEDC
1
P
H
A
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
1
P
H
A
700 (250 1,290)
1,090 (250 1,460)
3.84-3.67
2.50 (0.90 3.10)
3.50 (0.90 4.00)
8,530 (3,070 10,580)
11,940 (3,070 13,650)
880 (250 1,250)
1,100 (250 1,700)
4.56-4.36
3.40 (0.90 4.40)
4.20 (0.90 5.00)
11,600 (3,070 15,010)
14,330 (3,070 17,060)
780
660(+60)
780
280
530
280
215
278(+55)
215
7.5
23
7.5
1
NO. 0105E
CONTENTS
OUTDOOR UNIT
INDOOR UNIT
RAK-50PED
RAC-35WED
RAK-50PEDC
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
1
P
H
A
S
, E
0 5
H
1,560 (500 2,100)
5.41-5.18
7.16-6.85
5.00 (1.90 5.20)
17,060 (6,480 17,740)
1,660 (500 2,750)
5.56-5.31
7.62-7.29
6.00 (2.20 7.30)
20,470 (7,510 24,910)
660(+60)
780
530
280
278(+55)
215
24.5
8
After installation
9
OUTDOOR UNIT
RAC-50WED
z
2 ,
0 2
2 -
0 3
V
792(+91)
600
299(+47)
39.5

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  • Page 1: Table Of Contents

    660(+60) 660(+60) 792(+91) DIMENSIONS (mm) 278(+55) 278(+55) 278(+55) 299(+47) NET WEIGHT (Kg) 24.5 39.5 After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + 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 break er 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 RAK-18PED MODEL RAK-25PED RAK-35PED RAC-18WED RAC-35WED RAC-50WED RAK-50PED RAC-25WED RAK-25PEDC RAK-35PEDC RAK-50PEDC FAN MOTOR 4 W (DC120~380V) 30W (DC325V) FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – GSD088SKQA6JK6 GTD130UKQA8JT6 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR YES(INTERNAL) OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 15A, 2A, 3A, 3.15A...
  • Page 7 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-18PED/RAC-18WED RAK-25PED/RAC-25WED RAK-35PED/RAC-35WED above RAK-25PE /RAC-25WED 50mm RAK-35PE /RAC-35WED above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug (Procure locally) The indoor piping should be insulated with the enclosed insulation pipe.
  • Page 8 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-50PED/RAC-50WED RAK-50PEDC/RAC-50WED above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug (Procure locally) The indoor piping should be insulated with the enclosed insulation pipe.
  • Page 12 ADJUSTING THE AIRFLOW DIRECTION Adjust the airflow upward and downward. According to operation, the horizontal air deflector is automatically set to the proper angle suitable for each operation.The deflector can be swings up and down and also set to the desired angle using the “...

  • Page 18: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-18PED,RAK-25PED,RAK-35PED,RAK-50PED RAK-25PEDC,RAK-35PEDC,RAK-50PEDC INDOOR UNIT 16.8 (RAK-18/25/35PED、RAK-25/35PEDC) ( 12.7) (RAK-50PED、RAK-50PEDC) 450mm 445mm 220mm 15mm More than More than 123mm 123mm 50mm 50mm 32.5mm 22mm 60mm 65mm 80mm 440mm 85mm 534mm 780mm Service space...
  • Page 19 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-18WED,RAC-25WED,RAC-35WED OUTDOOR UNIT Air outlet 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.
  • Page 20 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-50WED OUTDOOR UNIT Unit : mm 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 21: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications RAK-18/25/35/50PED RAK-25/35/50PEDC THERMOSTAT MODEL OPERATION MODE 15.3 (59.54) 16.7 (62.06) INDICATION 15.0 (59.00) 16.7 (62.06) 23.3 (73.94) 24.7 (76.46) TEMPERATURE INDICATION ˚C (˚F) 23.0 (73.40) 24.7 (76.46) 31.3 (88.34) 32.7 (90.86) INDICATION 31.0 (87.80)
  • Page 22 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-18/25/35WED RAC-50WED GSD088SKQA6JK6 COMPRESSOR TYPE GTD130UKQA8JT6 POWER SOURCE 220 - 350 V 220 - 350 V OUTPUT 1350W 840W WHITE YELLOW 2M = 2.16 7 2M = 1.354 RAC-18/25/35WED RAC-50WED 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 23: Wiring Diagram

    WIRING DIAGRAM RAK-18/25/35/50PED RAC-18/25/35WED RAC-5 W ED RAK-25/35/50PEDC...
  • Page 24 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RAR-5 F1-1 Reset key JSW1(A/B changeover) Round for solder...

  • Page 25: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAK-18/25/35/50PED RAK-25/35/50PEDC...
  • Page 26 MODEL RA C -18/25/35 W ED...
  • Page 28 MODEL RAC-50WED...

  • Page 30: Block Diagram

    BLOCK DIAGRAM MODEL RAK-18/25/35/50PED RAK-25/35/50PEDC INDOOR UNIT Power source OUTDOOR UNIT 1 O 230V 50Hz Compressor Power circuit drive circuit Compressor Indoor / Outdoor Indoor / Outdoor motor interface circuit interface circuit Control power circuit DC fan motor Indoor DC fan motor drive circuit Outdoor DC fan motor Control...

  • Page 31: Basic Mode

    MODEL RAK-18/25/35/50PED RAK-25/35/50PEDC button button button button button button button button button button button Set to "ultra-Lo","Silent","Lo","Med","Hi","ultra-Hi" or "stop" depending on the room temperature, time and heat exchanger temperature. Set to "stop" if the heat exchanger temperature is "DNZKOF" during Thermo OFF.(When reach at "DNZKON", fan speed set Room temperature to "ultra-Lo"...
  • Page 32 Table 1 Mode data file RAK-35PED RAK-50PED RAK-25PED MODEL RAK-18PED RAK-25PEDC RAK-35PEDC RAK-50PEDC LABEL NAME VALUE WMAX 4200 5800 6250 5700 WMAX2 4200 5800 6250 5700 WSTD 3100 4550 5200 4700 WJKMAX 2800 4200 5000 4200 WBEMAX 2800 3800 4550 3600 WSZMAX 2800...
  • Page 33 Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto and when the compressor speed (P section) due to temperature difference between setting temperature (including the correction shift only) and room temperature is CMAX or higher. (2) Cool Dashed will release when i) a maximum 25 minutes is lapsed and ii) room temperature is lower than set temperature –3°C (thermo off) and iii) when room temperature has achieved setting temperature –1°C then maximum Cool Dashed time will be revised to 20 minutes.
  • Page 34 ,for RAK-50PED only (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTC. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Pressing the "START/STOP"...
  • Page 35 Notes: (1) If the room temperature is (cooling preset temperature) - (1.33°C) or less after 30 seconds from starting the operation, the operation is done assuming as the preset temperature = (room temperature at the time) - (2°C). (2) The indoor fan is operated in the “Lo” mode. During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute. (3) When the operation is started by the themostat turning ON, the start of the indoor fan is delayed 32 seconds after the start of compressor operation.
  • Page 36 (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTSD. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Pressing the "START/STOP" button and "POWERFUL"button during powerful operation wil cancel the powerful operation. (5) If the sleep timer is set during powerful operation, the powerful operation will be canceled.
  • Page 37 Notes: (1) Condition for entering into hot dashed mode. When fan set to "Hi" or "Auto" and i) room temperature is 18 or less, and ii) outdoor temperature is 10 or less, and iii) compressor speed (P section) due to temperature difference between setting temperature(including shift value only) and room temperature is WMAX or more.
  • Page 38 Same as Basic Heating operation STARCPIL (1) Pressing the "POWERFUL" button will increase the temperature setting by PWSFTW. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Defrost is inhibited for 20 minutes after the start of the powerful operation.
  • Page 39 Setting Defrosting Inhibit Period ECO button Cooling:0.66 Dehumidifying:0.66 DFTIM_OT P5 Set temperature DFTIM_OTP 10 Heating:0.66 DFTIM_OT P0 Current restrict Outdoor temperature – 1 0 – 5˚C ˚C Compressor speed Notes: The first inhibit time after operation start is set to DFTIM_FST. From the second time onwards, the inhibit time is set according to the time required for defrosting.
  • Page 40 RAK-18/25/35PED RAK-50PED RAK-25/35PEDC RAK-50PEDC Reversing valve defrosting Reversing valve defrosting 15' or more Auto fresh defrosting Over defrosting inhibit period 15' or more Auto fresh defrosting Over defrosting inhibit period Fan speed Stop Start/Stop button set to "Hi" Fan speed Stop set to "Hi"...

  • Page 41: Refrigerating Cycle Diagram

    MODEL RAK-18/25PED,RAK-25PEDC RAC-18/25WED Silencer Silencer Silencer Silencer...
  • Page 42 MODEL RAK-35PED,RAK-35PEDC RAC-35WED Silencer Silencer Silencer Silencer...
  • Page 43 MODEL RAK-50PED,RAK-50PEDC RAC-50WED Silencer Silencer Silencer Silencer Silencer Silencer...

  • Page 44: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAK-18/25/35/50PED RAK-25/35/50PEDC (3)Pull the support hook at the upper side of the 1. Front Panel indication lamp of the indicating P.W.B. and pull Be sure to hold the front panel with both hands to out the P.W.B.
  • Page 45 (3)Pull fan motor out of the remove the right. Points for attention of fan motor and tangential air flow fan installation. When installing the flow fan,the first part of the fan and water seal plate on the tube plate overlap, then tighten the screw.
  • Page 46 Remove P.W.B. fixing screws (2 locations) and <OUTDOOR UNIT> radiation fin fixing screws (7 locations), and MODEL RAC-18/25/35WED remove the P.W.B. from the support. 1. Electrical Parts (1) Remove the upper cover fixing screws and lift the Radiation fin fixing screw cover to remove it.

  • Page 47: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAK-18/25/35/50PED RAK-25/35/50PEDC 1. Control power circuit Switching power circuit Fig. 1-1 ・ An AC power supply from outdoor unit passes through the 3.15 A fuse, varistor (VA001), and noise filter circuit and rectified and smoothed by DB1 and C003 to become a DC current 325 V. It is then supplied to indoor fan motor drive circuit,and switching power circuit.
  • Page 48 2. Reset Circuit Reset R503 Microcomputer R502 IC501 Fig.2-1 Timing chart Voltage 5 . 0V pin of IC501 supply voltage RES detecting voltage RES canceling voltage 4 . 4V 4 . 2V Voltage pin of IC501 output voltage 5.0V pin of microcomputer Fig.2-2 Reset circuit is to initialize the indoor unit microcomputer when switching ON the power or after recovering from power failure.
  • Page 49 3. Drive circuit of the indoor fan motor Primary 325V Primary 18.5V Indoor fan motor Power siganl of indoor fan(from pin 57 of microcomputer) Primary 0 V Rotation speed feedback signal (to pin of microcomputer) Output signal of indoor fan (to pin of microcomputer) Fig.
  • Page 50 Caution The indoor fan motor and drive circuit are connected to the primary power supply. They therefore have voltage to ground. Guard against electric shocks. Caution ny circumstances detach or reattach a connector. Any such practice would cause a high voltage to r fan motor and board circuit being destroyed.
  • Page 51 6. Initial Setting Circuit (IC531) When power is supplied, the microcomputer reads the data in IC531 (E PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values. Data of self-diagnosis mode is stored in IC531; data will not be erased even when power is turned off. Fig.
  • Page 52 DSW1 R695 R903 R741 R905 R740 R906 R642 DSW1...
  • Page 53 11. Indoor/outdoor communication circuits Indoor unit side Outdoor unit side Inverter circuit Outdoor C302 microcomputer Indoor transmission circuit Indoor microcomputer (IC601) Outdoor Indoor/outdoor communication Outdoor reception chopper output (30kHz) reception circuit input Indoor transmission output Outdoor transmission circuit Outdoor transmission output Indoor reception input Indoor unit reception circuit...
  • Page 54 12. Stepping motor drive circuit Fig. 12-1 [Connector circuit waveform while the motor runs] Voltage waveforms of different phases as viewed from the OV line while the motor rotor is turning counterclockwise as viewed from the shaft side 4 terminal 3 terminal 2 terminal 1 terminal...
  • Page 55 RL1 RL2...
  • Page 56 Load side is a high voltage line, please be careful from electric shock and install the Indication Lamp as near as possible to the Relay Kit. The maximum length of the wiring cable should be below 100m.
  • Page 57 MODEL RAC-18/25/35WED 300-330 Main parts C021-C022,375 ,420V)
  • Page 58 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 59 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 R120 B-12V Expansion valve B-12V O/P 2.5V R120 B-0V) 1.0V...
  • Page 60 4.Reversing valve control circuit This model reversing valve control used to control the relay ON/OFF of the revesing valve, and also control the coil of the reversing valve ON/OFF. The relay ON/OFF has different type when in the different operation mode. You can see each operation mode as fllows.
  • Page 61 HIC P.W.B 70 74 75...
  • Page 62 6. Electric expansion valve circuit...
  • Page 63 2A Fuse DC300 -330V...
  • Page 64 ( DC300-330V )
  • Page 65 MODEL RAC-50WED 300-330...
  • Page 66 C021-C023,500 ,450V) 33 ACT R249 IP CUT 300-330...
  • Page 67 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 68 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 69 4.Reversing valve control circuit This model reversing valve control used to control the relay ON/OFF of the revesing valve, and also control the coil of the reversing valve ON/OFF. The relay ON/OFF has different type when in the different operation mode. You can see each operation mode as fllows.
  • Page 70 HIC P.W.B 70 74 75...
  • Page 71 6. Electric expansion valve circuit...
  • Page 72 2A Fuse DC300 -330V...
  • Page 73 ( DC300-330V )

  • Page 74: Service Call Q&A

    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 frost. of the indoor unit to gather Wait for 3 to 4 minutes frost.
  • Page 75 Common, etc. In fan speed "automatic" mode, In "automatic fan speed" mode, the This does not abnormal. It the product will sense the heat indoor fan changes from strong fan speed is because the cold fan exchange temperature and, to weak fan speed to slight fan speed. speed prevention is working.
  • Page 76 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 77: Trouble Shooting

    TROUBLE SHOOTING MODEL RAC-18/25/35/50WED Inspection instructions RAC-18/25/35WED RAC-50WED Indoor fan motor Indoor fan motor Power supply Power supply Indoor Electrical Outdoor Electrical Indoor Electrical Outdoor Electrical 1Φ 230V 50Hz 1Φ 230V 50Hz Compressor Compressor motor motor Warning Note that the 0 V line of the 0V line 0V line outdoor electrical parts and...
  • Page 78 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 79 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-18/25/35/50PED RAK-25/35/50PEDC FIXTURE SCREW FIXTURE SCREW FIXTURE SCREW Removing electrical parts 1. Remove the electrical parts cover. 2. Remove the connectors from the CN4 (heat exchange thermistor), CN15 (stepping motor) and CN2 (fan motor). 3.
  • Page 80 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 81 Troubleshooting support Function Self-diagnosis display ・The failure mode detected on the indoor unit side is displayed by [Display on the indoor blinking the "timer lamp". And a failure detected on the outdoor unit side] unit side will be indicated by the "time lamp" blinking 4 times. ・If the outdoor unit side detects a failure, the product will first conduct several operation retrials.
  • Page 82 Self-diagnosis display function (indoor side display) While the "timer lamp" (orange), of the indoor unit is blinking, troubleshoot the product while referring to the table below. 1. How to count the lamp blinking frequency [An example of 5-time blinking] ・ The product will repeat blinking with 2-second 2-second 2-second intermissions.
  • Page 83 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-18/25/35WED...
  • Page 84 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-50WED...
  • Page 85 Forced cooling operation The cooling operation can be forcibly performed for collecting refrigerant and inspecting failures. Do not perform the forced cooling operation continuously for long hours, because the compressor continues to be in operational status, regardless of room temperature. ＜How to start the operation＞...
  • Page 86 Diagnosis and troubleshooting of indoor electric parts, outdoor electric parts and refrigerating cycle Initiating troubleshooting Are the "timer lamp" (orange) of the indoor unit Perform troubleshooting according to the blinking? self-diagnosis display. The product will begin to run in response to a remote control setting: "cooling mode, temperature setting 16 "...
  • Page 87 Checking the indoor unit electrical parts Introduction First check the failure phenomenon and status, and then move on to elaborate diagnosis. Initiating troubleshooting How many times does the time lamp Is the "timer lamp" (orange) of the indoor unit blinking? blinding not 4 times 4 times...
  • Page 88 1. Failure phenomenon: The power will not become turned on. Neither initialization, remote control, nor any other step works on the vane position at power-on. Situation Estimated cause of fuse blowout ・ Abnormally high voltage applied to the power supply [ Estimated failure ・...
  • Page 89 2.Failure phenomenon: The product will not receive a remote control signal. Situation The product does not receive a remote control signal. It is not very responsive. (The product does run normally in response to the emergency operation switch.) Estimated failure ・...
  • Page 90 How to identify sources of jamming in the reception of remote control signals [ Situation ] The product may become poorly responsive to remote control signals due to external factors even though the product itself is trouble-free. [ Estimating sources of jamming ] Identify the installation status of the air-conditioner and the indoor and outdoor environments to identify possible causes of the jamming.
  • Page 91 Effects of other Checking points electrical products ・Check the effects of light and power noises coming from other electrical products. ・Turn on and off the electrical products, turn off the power and turn on the power, and check their effects on the reception of remote control signals.
  • Page 92 3. Failure phenomenon: The compressor will not run. [ Situation ] The compressor will not run (the same state as the thermometer turned off), the product receives remote control signals normally. The self-diagnosis lamp (LD301) of the outdoor unit blinks once or becomes turned off. [ Estimated failure locations ] ・Room temperature thermistor, heat exchanger thermistor ・...
  • Page 93 4. Failure phenomenon: The fan motor will not stop. Situation I have conducted the stop operation on the product by remote control, but the indoor fan motor will not stop. (It stopped about 10 minutes later.) ・Indoor fan motor Estimated failure locations ・Fan motor drive circuit Diagnosis flow Initiating troubleshooting...
  • Page 94 5. Timer lamp blinking: blinking once [Situation] The timer lamp blinks one time and the product will not operate. (This is not a sign of a breakdown.) ・ Reversing valve defective. [Estimated failure locations] ・ The refrigerating cycle block gas leak. 6.
  • Page 95 9. Timer lamp blinking: blinking 9 times [Situation] The timer lamp blinks 9 times and the product will not run. [Estimated failure location] Loose connector, wire break, or short-circuit in the room temperature thermistor, heat exchanger thermistor. [Cautions] Starting the product by remote control will initiate failure detection. (Merely turning on the power will not activate the failure detection function.) [Diagnosis flow] Initiating troubleshooting...
  • Page 96 10. Timer lamp blinking: blinking 10 times [Situation] The timer lamp blinks 10 times and the product will not run. [Estimated failure locations] Loose connector or wire break in the indoor fan motor Indoor fan motor mechanically locked Indoor fan motor Indoor fan motor drive circuit [Diagnosis flow] Initiating troubleshooting...
  • Page 97 11. Timer lamp blinking: blinking 12 times [Situation] The timer blinks 12 times and the product will not run. [Estimated failure locations] Erroneous connection in the indoor-outdoor connection line (F cable) Forget to connect CN27 of outdoor P.W.B Wire break or poor insertion of the indoor-outdoor connection line (F cable) Electrical parts in the outdoor unit (communication circuit, power circuit error) Communication error due to noise in other home electronics This does not constitute a failure in the air-conditioner...
  • Page 98 After turning on the power, perform air purification by remote control. Is there 230V AC between Is the LD301 turned on? Ensure the power supply. terminal boards L and N? Breaker activated Normal Check for electrical leakage. After that, Has the breaker not been activated? turn on the breaker and make a double -check.
  • Page 99 * This page is only for RAC-18/25/35WED 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 100 Check the blinking frequency of the LD301. * This page is only for RAC-50WED 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 101 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 102 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 103 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-50WEC/RAC-20WECI only) Change the outdoor ele.
  • Page 104 1.Remove rear cover as shown in figure Remove screws Remove screws Remove rear cover (3PC) (3PC) 2.Short the J1 ON PCB according to different supplier. For distinguishing them, we attached different type label in the battery case as below. RAR-5F1-1 NOTE:...
  • Page 105 Press and hold (OFF) button and (ON) button. Press [RESET] button on the same time. Release [RESET] button only, then release (OFF) (ON) button once Screen 1 appears. Screen 1 Screen 2 3. Press the button to display fan mode (Screen 3). Screen 3 Press the Temperature button ( ) to change the shift value.
  • Page 106 (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 107 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 108 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 109 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-18/25/35/50PED RAK-25/35/50PEDC...
  • Page 110 INDOOR UNIT MODEL: RAK-18/25/35/50PED H H A W P A R T S N O H H A W P A R T S N O H H A W P A R T S N O H H A W P A R T S N O Q ' T Y / Q ' T Y / Q ' T Y /...
  • Page 111 INDOOR UNIT MODEL: RAK-25/35/50PEDC H H A W P A R T S N O H H A W P A R T S N O H H A W P A R T S N O H H A W P A R T S N O Q ' T Y / Q ' T Y / Q ' T Y /...
  • Page 112 OUTDOOR UNIT MODEL RAC-18/25/35WED (35WED) (18/25WED) 5(18/25WED) 5(35WED) 25WED) (35WED)
  • Page 113 OUTDOOR UNIT MODEL: R A C - 1 8 / 2 5 / 3 5 W E D HHAW PARTS NO Q'TY/ PARTS NAME UNIT RAC-18WED RAC-25WED RAC-35WED HWRAC-18WED BASE HWRAC-18WED COMPRESSOR HWRAC-18WED COMPRESSOR RUBBER HWRAC-18WEB PUSH NUT HWRAC-18WED HWRAC-35WED...
  • Page 114 OUTDOOR UNIT MODEL RAC-50WED...
  • Page 115 OUTDOOR UNIT MODEL: R A C - 5 0 W E D HHAW PARTS NO Q'TY/ PARTS NAME UNIT RAC-50WED BASE HWRAC-50WPC A01 HWRAC-50WED A01 COMPRESSOR HWRAC-50NX2 A04 PUSH NUT CONDENSER HWRAC-50WEC A01 REVERSING VALVE HWRAC-50WED A02 HWRAC-50WEA A05 SERVICE VALVE HWRAC-50WEA A06 SERVICE VALVE ELECTRIC EXPANSION VALVE...
  • Page 116 RAK-18PED/RAC-18WED NO. 0105E JCH-WH RAK-25PED/RAC-25WED RAK-35PED/RAC-35WED RAK-50PED/RAC-50WED RAK-25PEDC/RAC-25WED RAK-35PEDC/RAC-35WED RAK-50PEDC/RAC-50WED...

This manual is also suitable for:

Rak-18pedRak-25pedRac-25wedRak-35pedRac-35wedRak-50ped ... Show all

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