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Hitachi RAK-15QPB Service Manual
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Hitachi RAK-15QPB Service Manual

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Table of Contents

SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
INDOOR UNIT
RAR-6N2
RAK-15QPB
RAK-18RPB
RAK-25RPB
This manual describes only points that differ from
RAM-33NP2B（PM NO.0581E）
RAM-40NP2B（PM NO.0582E）
RAM-53NP2B,RAM-53NP3B（PM NO.0583E）
RAM-68NP3B
（PM NO.0584E）
RAM-70NP4B
（PM NO.0585E）
RAM-90NP5B
（PM NO.0586E）
RAM-110NP6B
（PM NO.0587E）
RAC-18WPB,RAC-25WPB,RAC-35WPB，RAC-50WPB（HHAW NO.0080E）
for items not described in this manual.
Indoor unit
Single outdoor unit
RAM-33NP2B
RAM-40NP2B
RAM-53NP2B
RAM-53NP3B
Multi
outdoor unit
RAM-68NP3B
RAM-70NP4B
RAM-90NP5B
RAM-110NP6B
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
Hitachi Household Appliances(Wuhu) Co., Ltd.
RAK-35RPB
RAK-50RPB
RAK-15QPB
RAK-18RPB
-
RAC-18WPB
o
o
o
o
o
o
o
o
INDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
RAC-18W
PB
RAK-25R
RAK-18R
PB
1 PHASE,50HZ,220-230V
1 PHASE,50HZ,220-230V
550 (
250
1010
)
3.12-2.97
2.00 (0.90 2.50)
8,530 (3,070 10,920)
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
HHAW NO.0089E-1
RAK-15QPB
RAK-18RPB
RAK-25RPB
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ----------------------------------------------------------------------10
RAR-6N1
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 44
MAIN PARTS COMPONENT --------------------------------------------------- 46
WIRING DIAGRAM ---------------------------------------------------------------- 47
CIRCUIT DIAGRAM --------------------------------------------------------------- 49
BLOCK DIAGRAM ----------------------------------------------------------------- 51
BASIC MODE ----------------------------------------------------------------------- 52
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 64
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 68
VARIOUS SETTINGS -----------------------------------------------------------------
PARTS LIST AND DIAGRAM -------------------------------------------------- 105
RAC-25WPB
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
DC INVERTER
OUTDOOR UNIT
INDOOR UNIT
PB
RAC-25W
PB
RAK-35R
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
- 1 -
RAK-35RPB
RAK-50RPB
CONTENTS
RAK-50RPB
RAC-35WPB
RAC-50WPB
-
o
o
o
o
o
o
o
OUTDOOR UNIT INDOOR UNIT
PB
RAC-35W
PB
RAK-50R
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
6
7
87
-
-
o
o
o
o
o
o
OUTDOOR UNIT
RAC-50W
PB
792(+91)
600
299(+47)
40

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  • Page 1: Table Of Contents

    20,470 (7,510 24,910) 660(+60) 660(+60) 750(+65) 792(+91) DIMENSIONS (mm) 278(+35) 278(+35) 288(+27.5) 299(+47) NET WEIGHT (Kg) 27.5 27.5 After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT Hitachi Household Appliances(Wuhu) Co., Ltd. - 1 -...
  • 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 MODEL RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB 30W (DC325 V) FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR – COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.15A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER 450NR VARISTOR NOISE SUPPRESSOR...
  • Page 7 Figure showing the installation of lndoor unit MODEL RAK-15Q PB RAK-18RPB RAK-25RPB above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2300 mm or more Plug The indoor piping should be insulated with the enclosed insulation pipe.
  • Page 8 Figure showing the installation of lndoor unit MODEL RAK-35RPB RAK-50RPB above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2300 mm or more Plug The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commercial products.) - 8 -...
  • Page 9 Main PCB. SWITCH POSITION CAPACITY SELECTION 1.0kW 1.5kW 1.0kW 1.0kW 1.5kW 1.5kW NOTE: FACTORY default setting is at 1.5kW capacity. This setting is applicable for RAK-15QPB only. - 9 -...

  • Page 10: How To Use

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  • Page 38 This will wet your furniture. For the RAK-15QPB,RAK-18/25RPB Adjustment of the conditioned air to the left and right. Hold the vertical air deflector as shown in the figure and adjust the conditioned air to the left and right.
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  • Page 44: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-15Q PB ,RAK-18RPB ,RAK-25RPB INDOOR UNIT 19 .3 More than More than 50mm 50mm Service space - 44 -...
  • Page 45 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-35RPB ,RAK-50RPB INDOOR UNIT 369.5 231.5 231.5 4 55 19 .3 (RAK-35RPB) (RAK-50RPB) 12.7 More than More than 50mm 50mm Service space - 45 -...

  • Page 46: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB 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...

  • Page 47: Wiring Diagram

    WIRING DIAGRAM RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB - 47 -...
  • Page 48 WIRING DIAGRAM OF THE PRINTED WIRING BOARD RAR-6 N2 [Remote controller] RAR-6 N1 / RAR-6 N2 SWB~SW10 Carbon SW RAR-6 N1 Reset carbon SW Only for RAR-5E2 - 48 -...

  • Page 49: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAK-15QPB POWER FOR CLEANNESS - 49 -...
  • Page 50 CIRCUIT DIAGRAM MODEL RAK-18RPB,RAK-25RPB RAK-35RPB,RAK-50RPB POWER FOR CLEANNESS - 50 -...

  • Page 51: Block Diagram

    BLOCK DIAGRAM MODEL RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB INDOOR UNIT Outdoor unit Indoor / Outdoor interface circuit DC fan motor Indoor DC fan motor drive circuit Control Power circuit Reset circuit Indicating lamp Operation Timer Buzzer circuit Wireless receive Wireless remote /send circuit controller...

  • Page 52: Basic Mode

    MODEL RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB 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 53 For the multi MODEL RAK-15QPB(1.5KW) RAK-15QPB(1.0KW) RAK-18RPB RAK-25RPB RAK-35RPB RAK-50RPB REQUIRED REQUIRED REQUIRED REQUIRED REQUIRED REQUIRED PROM NO. LABEL NAME VALUE OF UNIT VALUE OF UNIT VALUE OF UNIT VALUE OF UNIT VALUE OF UNIT VALUE OF UNIT...
  • Page 54 For the single indoor unit Table 1 Mode data file MODEL RAK-18RPB RAK-25RPB RAK-35RPB RAK-50RPB 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...
  • Page 55 ,for RAK-15Q PB,RAK-18/ 25/ 50RPB only 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 56 ,for RAK-15Q PB,RAK-18/ 25/ 50RPB 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 57 ,for RAK-15Q PB,RAK-18/ 25/ 50RPB only 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”...
  • Page 58 (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 59 button Silent STARCPIL ,for RAK-15Q PB,RAK-18/ 25/ 50RPB only 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 60 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 61 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 62 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. - 62 -...
  • Page 63 RAK-15QPB RAK-18RPB RAK-25RPB RAK-35RPB RAK-50RPB 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 64: Refrigerating Cycle Diagram

    MODEL RAK-15Q PB RAK-18RPB RAK-25RPB INDOOR UNIT OUTDOOR UNIT Outdoor unit INDOOR UNIT OUTDOOR UNIT Outdoor unit - 64 -...
  • Page 65 MODEL RAK-35RPB RAK-50RPB COOLING CYCLE INDOOR UNIT OUTDOOR UNIT （ＲＡＫ－３５ＲＰＢ） １／２ （ＲＡＫ－５０ＲＰＢ） Outdoor unit HEATING CYCLE INDOOR UNIT OUTDOOR UNIT （ＲＡＫ－３５ＲＰＢ） １／２ （ＲＡＫ－５０ＲＰＢ） Outdoor unit - 65 -...

  • Page 66: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAK-15Q PB,RAK-18RPB,RAK-25RPB RAK-35RPB,RAK-50RPB RAK-35RPB,RAK-50RPB Screw Front Panel Screw Be sure to hold the front panel with both hands to detach and attach it. RAK-15Q PB,RAK-18RPB,RAK-25RPB Terminal Screw cover Shaft Screw cover Hole 3. Control P .W.B. and Indicating P.W.B.
  • Page 67 4. Tangential air flow fan and fan motor Press to lower the hook at the center of theunit a little and pull the claw forward to removethe drain pan. 18/25PPB only have one Fig. 5 (2) Remove the screws from the upper and lower bearing covers. (3) Remove the locking hook of the lower bearing cover from the Cabinet.

  • Page 68: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB 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 69 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 70 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 71 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 72 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 73 7. Temporary Switch Circuit MICROCOMPUTER Temporary switch R405 TEMPORARY SW SW211 Fig. 7-1 The temporary switch is used to operate the air conditioner temporarily when the wireless remote control is lost or faulty. The air conditioner operates in the previous mode at the previously set temperature. However, when the power switch is set to OFF, it starts automatic operation.
  • Page 74 DSW1 R695 R903 R741 R905 R740 R906 R642 DSW1 - 74 -...
  • Page 75 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 76 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 77: Service Call Q&A

    SERVICE CALL Q&A RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB MODEL 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 78 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 79 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 80 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-15QPB,RAK-18RPB,RAK-25RPB,RAK-35RPB,RAK-50RPB 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).
  • Page 81 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 82 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 83 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 84 - 84 -...
  • Page 85 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 - 85 -...
  • Page 86 Forced cooling operation (Only single connection) 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 87 53 and page 54 - 87 -...
  • Page 88 RAR-6N1, RAR-6N2, RAR-6N3, RAR-6N4, RAR-6N5 ) Please set the DIP switch No.6 to ON accordingly (Refe to page - 88 -...
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  • Page 91 HOW TO CHANGE THE INTERMITTENT FAN CONTROL SETTING The intermittent fan control during thermo off in Heating mode can be changed by the remote controller. (This procedure should be done only by service personnel.) It is possible to select from 3 patterns. PROCEDURE 1.
  • Page 92 HOW TO CHANGE THE FAN SPEED IN COOLING MODE DURING THERMO OFF The fan speed in Cooling mode during thermo off can be changed by the remote controller. (This procedure shall be implemented strictly by service personnel only.) It is possible to return it to the default setting. PROCEDURE Press [ POWERFUL] button and...
  • Page 93 Diagnosis and troubleshooting of indoor electric parts 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 94 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 95 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 96 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 97 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 98 Effects of other Checking points ・Check the effects of light and power noises coming from other electrical products. 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 99 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 100 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 101 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 102 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 103 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 104 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 105: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-15QPB,RAK-18RPB,RAK-25RPB - 105 -...
  • Page 106 INDOOR UNIT H H A W P A R T S N O Q ' T Y P A R T S N A M E / U N IT RAK-15QPB RAK-18RPB RAK-25RPB HWRAK-18PSPA CABINET ASS'Y HWRAK-25PEA VERTICAL AIR DEFLECTOR...
  • Page 107 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-35RPB,RAK-50RPB - 107 -...
  • Page 108 INDOOR UNIT H H A W P A R T S N O Q ' T Y P A R T S N A M E / U N IT RAK-35 RAK-50RPB CABINET ASS'Y HWRAK-35PPB FAN MOTOR HWRAK-18PEB TANGENTIAL AIR FLOW FAN HWRAK-35PPB FAN SUPPORT ASS'Y HWRAS-25YH4...

  • Page 109: Rak-25Rpb Rak-35Rpb

    RAK-15QPB HHAW NO.0089E-1 RAK-18RPB RAK-25RPB RAK-35RPB RAK-50RPB - 109 -...

This manual is also suitable for:

Rak-18rpbRak-25rpbRak-35rpbRak-50rpbRac-18wpbRac-25wpb ... Show all

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