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Hitachi RAC-25WPB Service Manual
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Hitachi RAC-25WPB Service Manual

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Download this manual See also: Instruction Manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-18WPB
RAC-35WPB
RAC-25WPB
RAC-50WPB
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
Hitachi Household Appliances(Wuhu) Co., Ltd.
INDOOR UNIT
RAR-5E2
RAK-18PPB
RAK-25PPB
RAR-5E1
RAK-35PPB
RAK-50PPB
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
RAC-18W
PB
RAK-25P
RAK-18P
PB
1 PHASE,50HZ,220-230V
1 PHASE,50HZ,220-230V
550 (
250
) 0 1 0 , 1
3.12-2.97
2.00 (0.90 2.50)
8,530 (3,070 10,580)
580 (250 970)
3.49-3.34
2.50 (0.90
3.20)
11,600 (3,070 15,010)
11,600 (3,070 15,010)
780
660(+60)
780
280
530
280
218
278(+35)
218
7.5
27.5
7.5
INDOOR UNIT + OUTDOOR UNIT
HHAW
RAK-18PPB/RAC-18WPB
RAK-25PPB/RAC-25WPB
RAK-35PPB/RAC-35WPB
RAK-50PPB/RAC-50WPB
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 6
How To Use ----------------------------------------------------------------------10
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 43
Main Parts Component --------------------------------------------------- 48
Wiring Diagram ---------------------------------------------------------------- 50
CIRCUIT DIAGRAM --------------------------------------------------------------- 52
BLOCK DIAGRAM ----------------------------------------------------------------- 55
BASIC MODE ----------------------------------------------------------------------- 56
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 67
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY-------------70
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 73
SERVICE CALL Q & A ---------------------------------------------------------- 98
TROUBLE SHOOTING -----------------------------------------------------------102
Parts List And Diagram --------------------------------------------------1
DC INVERTER
OUTDOOR UNIT
INDOOR UNIT
PB
RAC-25W
PB
RAK-35P
1 PHASE,50HZ,220-230V
700 (250
1,290)
1,090 (250 1,460)
3.75-3.59
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)
14,330 (3,070 17,060)
660(+60)
900
530
295
278(+35)
230
27.5
10
NO.0080E-3
CONTENTS
OUTDOOR UNIT INDOOR UNIT
PB
RAC-35W
PB
RAK-50P
PB
1 PHASE,50HZ,220-230V
1,560 (500 2,100)
4.87-4.66
7.30-6.98
5.00 (1.90 5.20)
17,060 (6,480 17,740)
1,660 (500 2,750)
5.51-5.27
7.93-7.59
6.00 (2.20 7.30)
20,470 (7,510 24,910)
750(+65)
900
548
295
288(+27.5)
230
34
10
After installation
38
OUTDOOR UNIT
RAC-50W
PB
792(+91)
600
299(+47)
40

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  • Page 1: Service Manual

    (B.T.U./h) 660(+60) 660(+60) 750(+65) 792(+91) DIMENSIONS (mm) 278(+35) 278(+35) 288(+27.5) 299(+47) 27.5 27.5 NET WEIGHT (Kg) After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT Hitachi Household Appliances(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 RAK-18PPB RAK-25PPB RAC-18WPB MODEL RAC-35 PB RAC- RAK-35PPB RAC-25WPB RAK-50PPB FAN MOTOR 47W (DC120~380V) 30W (DC325 V) FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – ASD084SFNA7JK1 5RS132Z BA21 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR YES(INTERNAL) OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.15A...
  • Page 7 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-18PP /RAC-18WP RAK-25PP /RAC-25WP above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug The indoor piping should be insulated with the enclosed insulation pipe.
  • Page 8 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-35PP /RAC-35WP above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug The indoor piping should be insulated with the enclosed insulation pipe.
  • Page 9 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-50PPB/RAC-50WPB above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug The indoor piping should be insulated with the enclosed insulation pipe.

  • Page 43: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-18PPB ,RAK-25PPB INDOOR UNIT 19 .3 More than More than 50mm 50mm Service space...
  • Page 44 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-35PPB ,RAK-50PPB INDOOR UNIT 369.5 231.5 231.5 19 .3 (RAK-35PPB) (RAK-50PPB) 12.7 More than More than 50mm 50mm Service space...
  • Page 45 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-18WPB,RAC-25WPB 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 46 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-35WPB OUTDOOR UNIT Handle Handle Air outlet Air Suction grill Rear side Holes for anchor bolt (2 – ø12 x 6 slots for ø8.0 bolt) Notch for anchor bolt (for 2 – ø8.0 bolt) Drain hole Fixing hole Drain hole Service space...
  • Page 47 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-50WPB OUTDOOR UNIT Unit : mm 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 48: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications RAK-18PPB,RAK-25PPB,RAK-35PPB,RAK-50PPB 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) 32.7...
  • Page 49 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-50WPB RAC- 18/ 25/35WPB COMPRESSOR TYPE ASD084SFNA7JK1 5RS132Z BA21 POWER SOURCE 100 - 240 V 220 - 350 V WHITE YELLOW 2M= 0.74 2M= 2.4 2M= 0.88 2M= 2.0 YELLOW YELLOW WHITE WHITE COMPRESSOR RAC-50WPB RAC-18/ 25/35WPB CAUTION...

  • Page 50: Wiring Diagram

    WIRING DIAGRAM RAC-18/25/35WPB RAC-5 W PB K -18/ 25 / 3 5 / 5 0P PB...
  • Page 51 WIRING DIAGRAM OF THE PRINTED WIRING BOARD e l l SWB~SW10 Carbon SW Reset carbon SW Only for RAR-5E2...

  • Page 52: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAK-18/25/35/50PPB POWER FOR CLEANNESS...
  • Page 53 MODEL RA C -18/25/35 W PB...
  • Page 54 MODEL RAC-50WPB...

  • Page 55: Block Diagram

    BLOCK DIAGRAM MODEL RAK-18/25/35/50PPB RAC-18/25/35/50WPB 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 56 MODEL RAK-18/25/35/50PPB 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 to "ultra-Lo"...
  • Page 57 Table 1 Mode data file MODEL RAK-18PPB RAK-25PPB RAK-35PPB RAK-50PPB LABEL NAME VALUE WMAX 4200 min-1 6200 min-1 6700 min-1 6000 min-1 WMAX2 4200 min-1 6200 min-1 6700 min-1 6000 min-1 WSTD 3000 min-1 4500 min-1 5700 min-1 4800 min-1 WJKMAX 2800 min-1 4200 min-1...
  • Page 58 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 59 (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" button and "POWERFUL"button during powerful operation wil cancel the powerful operation.
  • Page 60 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 61 (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 62 button Silent STARCPIL 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 63 SILENT Silent button Indoor WSZMAX/CSZMAX Compresson speed Outdoor Notes: Can’t set POWERFUL and SILENT at the same time. Setting Defrosting Inhibit Period DFTIM_OT P5 DFTIM_OTP 10 DFTIM_OT P0 Outdoor temperature – 1 0 – 5˚C ˚C 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 64 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 65 ECO button Cooling:0.66 Dehumidifying:0.66 Set temperature Heating:0.66 FCLN_WAM_P FCLN_SDF_P Current restrict Compressor speed CLNCMP Notes: Can’t set POWERFUL and ECO at the same time. During FAN operation,can’t set ECO.
  • Page 66 RAK/C-18P/WPB RAK/C-25P/WPB RAK/C-35P/WPB RAK/C-50P/WPB 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 67 MODEL RAK-18/25PPB RAC-18/25WPB INDOOR UNIT INDOOR UNIT...
  • Page 68 MODEL RAK-35PPB RAC-35WPB COOLING CYCLE OUTDOOR UNIT INDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT...
  • Page 69 MODEL RAK-50PPB RAC-50WPB COOLING CYCLE OUTDOOR UNIT INDOOR UNIT １／２ １／２ １／４ １／４ HEATING CYCLE INDOOR UNIT OUTDOOR UNIT １／２ １／２ １／４ １／４...

  • Page 70: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAK-18/25/35/50PPB Front Panel 3. Control P .W.B. and Indicating P.W.B. Be sure to hold the front panel with both hands to detach and attach it. (1)Remove each connector from the lead wire. (2)Remove the four P.W.B. supports from the RAK-18/25PPB control P.W.B.
  • Page 71 4. Tangential air flow fan and fan motor (5) Remove the electrical box fixing screws and GND wire fixing Press to lower the hook at the center of theunit a little and pull the screw. claw forward to removethe drain pan. 18/25PPB only have one Fig.
  • Page 72 OUTDOOR UNIT MODEL RAC-50WPB OUTDOOR UNIT MODEL RAC-35WPB 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. (2)Remove the top cover lock screw and raise the (2)Remove the top cover lock screw and raise the cover to remove it.

  • Page 73: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-18PPB /25PPB /35PPB /50PPB 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.
  • Page 74 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 75 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 76 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 While the product is energized, do not under any circumstances detach or reattach a connector. Any such practice would cause a high voltage to run, resulting in the indoor fan motor and board circuit being destroyed.
  • Page 77 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 78 DSW1 R695 R903 R741 R905 R740 R906 R642 DSW1...
  • Page 79 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 80 12. Stepping motor drive circuit Microcomputer Vertical vane, left Vertical vane, left Vertical vane, left Vertical vane, left Horizontal sweep motor Lateral vane Lateral vane Lateral vane Lateral vane Vertical sweep motor 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...
  • Page 81 RAC-18/25/35WPB 300-330 Main parts C021-C022,37 5 ,420V)
  • Page 82 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 83 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 84 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 85 HIC P.W.B 70 74 75...
  • Page 86 6. Electric expansion valve circuit...
  • Page 87 2A Fuse DC300 -330V...
  • Page 88 ( DC300-330V )
  • Page 89 50WPB 300-330...
  • Page 90 C021-C023,500 ,450V) 33 ACT R249 IP CUT 300-330...
  • Page 91 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 92 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 93 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 94 HIC P.W.B 70 74 75...
  • Page 95 6. Electric expansion valve circuit...
  • Page 96 2A Fuse DC300 -330V...
  • Page 97 ( DC300-330V )

  • Page 98: Service Call Q & A

    SERVICE CALL Q&A MODEL RAK-18/25/35/50PPB, 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 99 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 exchange temperature and, to weak wind to slight wind. prevention is working.

  • Page 100: Wireless Remote Control

    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 101 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 102: Trouble Shooting

    TROUBLE SHOOTING MODEL RAC-18/25/35/50WPB, Inspection instructions Compressor Compressor motor motor Warning Note that the 0 V line of the outdoor electrical parts and the primary power circuit of the indoor electrical parts have voltages to ground as illustrated in the right-hand figure.
  • Page 103 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 104 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-18/25/35/50P B FIXTURE SCREW ELECTRICA L. COVER 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 105 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 106 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 107 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 108 109.
  • Page 109 9 times Indoor interface circuit broken 1. Indoor interface circuit (sigle only) 9 times communication error between indoor 12 times Outdoor interface circuit broken 1. Outdoor interface circuit (sigle only) and outdoor units...
  • Page 110 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-18/25/35WP B...
  • Page 111 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-50WP B...

  • Page 112: Forced Cooling Operation

    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 113 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 114 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 115 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 116 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 117 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 118 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 119 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 120 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.) Estimated failure locations ・Indoor fan motor ・Fan motor drive circuit Diagnosis flow Initiating troubleshooting...
  • Page 121 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.) [Estimated failure locations] ・ Reversing valve defective. ・ The refrigerating cycle block gas leak. 6.
  • Page 122 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 123: Indoor Fan Motor

    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]...
  • Page 124 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 125 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 126 * This page is for RAC-18/25/35WPB 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 127 Check the blinking frequency of the LD301. * This page is only for RAC-50WPB 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 128 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 129 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 130 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 132 Please set the DIP switch No.6 to ON accordingly (Refe to page...
  • Page 135 (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 136 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 137: How To Operate The Outdoor Unit Independently

    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 138 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-18/25PPB...
  • Page 139 INDOOR UNIT HHAW PARTS NO Q'TY/UN PARTS NAME RAK-18PPB RAK-25PPB HWRAK-18PSPA 901 CABINET ASS'Y HWRAK-25PEA 902 VERTICAL AIR DEFLECTOR HWRAK-18PEB 901 FAN MOTOR HWRAK-18PSPA 902 TANGENTIAL AIR FLOW FAN HWRAS-25YH4 908 FAN SUPPORT ASS'Y HWRAS-E10H3 905 FAN COVER HWRAS-10EH4 901 FAN MOTOR SUPPORT HWRAK-18PEB 902 EVAPORATOR ASS'Y...
  • Page 140 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-35/50PPB...
  • Page 141 INDOOR UNIT HHAW PARTS NO Q'TY/UN PARTS NAME RAK-35PPB RAK-50PPB HWRAK-35PPB CABINET ASS'Y HWRAK-18PEB FAN MOTOR HWRAK-35PPB TANGENTIAL AIR FLOW FAN HWRAS-25YH4 FAN SUPPORT ASS'Y HWRAK-35PPB FAN COVER HWRAK-35PPB FAN MOTOR SUPPORT HWRAK-35PPB EVAPORATOR ASS'Y HWRAK-35PPB HWRAK-50PPB PIPING ASS'Y HWRAK-35PPB UPPER COVER HWRAS-25YH4 SPRING...
  • Page 142 OUTDOOR UNIT MODEL RAC-18/25WPB...
  • Page 143 OUTDOOR UNIT HHAW PARTS NO Q'TY/UN PARTS NAME RAC-18WPB RAC-25WPB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-50WEA HWRAC-10GH5 HWRAC-18WEB HWRAC-18WSA HWRAC-E10H2 HWRAC-D10EX HWRAC-18WEB HWRAC-E08H HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-25YH4 HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB HWRAC-18WEB TERMINAL BOARD (5P)
  • Page 144 OUTDOOR UNIT MODEL RAC-35WPB...
  • Page 145 OUTDOOR UNIT HHAW PARTS NO Q'TY/UN PARTS NAME RAC-35WPB HWRAC-35WPB BASE HWRAC-18WEB COMPRESSOR HWRAC-25YH4 PUSH NUT HWRAC-35WPB CONDENSER HWRAC-35WPB REVERSING VALVE HWRAC-50WEA 2S-VALVE HWRAC-10GH5 3S-VALVE HWRAC-SX10HAK A09 SOUND PROOF COVER ASSEMBLY HWRAC-35YH4 ELECTRIC EXPANSION VALVE HWRAC-SX10HAK A10 SOUND PROOF COVER ASSEMBLY HWRAC-18WEB O.L.R COVER HWRAC-25WXA...
  • Page 146 RAC-50WP...
  • Page 147 OUTDOOR UNIT HHAW PARTS NO Q'TY/UN PARTS NAME RAC-50WPB HWRAC-50NX2 BASE HWRAC-50NX2 COMPRESSOR HWRAC-50NX2 COMPRESSOR RUBBER HWRAC-50NX2 PUSH NUT HWRAC-50NX2 CONDENSER HWRAC-50WPB REVERSING VALVE HWRAC-50WEA SERVICE VALVE HWRAC-50WEA SERVICE VALVE HWRAC-50NX2 ELECTRIC EXPANSION VALVE HWRAC-50NX2 SOUND PROOF HWRAC-50WEA SOUND PROOF HWRAC-50NX2 SOUND PROOF HWRAC-50WPB...

  • Page 148: No.0080E

    HITACHI RAK-18PPB /RAC-18WPB HHAW NO. 0080E- RAK-25PPB /RAC-25WPB RAK-35PPB /RAC-35WPB RAK-50PPB /RAC-50WPB...

This manual is also suitable for:

Rac-18wpbRak-18ppbRak-25ppbRak-50ppbRac-35wpbRac-50wpb ... Show all

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