Hitachi RAK-18QXB Service Manual

Hitachi RAK-18QXB Service Manual

Indoor unit
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SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
INDOOR UNIT
RAK-18QXB
RAK-25RXB
RAK-35RXB
RAK-50RXB
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-25WXB,RAC-35WXB,RAC-50WXB(HHAW NO.0081E)
for items not described in this manual.
Indoor unit
Single outdoor unit
RAM-33NP2B
RAM-40NP2B
RAM-53NP2B
Multi
RAM-53NP3B
outdoor
RAM-68NP3B
unit
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-18QXB
RAK-25RXB
-
RAC-25WXB
o
o
o
o
o
o
o
o
DC INVERTER
INDOOR UNIT
OUTDOOR UNIT
RAK-25R
XB
RAC-25W
XB
1 PHASE,50HZ,220-230V
545 (250 1,220)
3.19-3.05
2.50 (0.90 3.10)
8,530 (3,070 10,580)
700 (250 1,200)
3.85-3.68
3.20 (0.90 4.20)
10,920 (3,070 14,330)
900
750(+65)
295
548
210
288(+27.5)
11
34
INDOOR UNIT
- 1 -
NO.0088E-1
HHAW
RAK-18QXB
RAK-25RXB
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ---------------------------------------------------------------------- 9
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 29
MAIN PARTS COMPONENT --------------------------------------------------- 30
WIRING DIAGRAM ---------------------------------------------------------------- 31
CIRCUIT DIAGRAM --------------------------------------------------------------- 33
BLOCK DIAGRAM ----------------------------------------------------------------- 35
BASIC MODE ----------------------------------------------------------------------- 36
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 47
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 51
VARIOUS SETTINGS ----------------------------------------------------------------- 71
PARTS LIST AND DIAGRAM --------------------------------------------------
RAK-35RXB
RAC-35WXB
-
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
INDOOR UNIT
OUTDOOR UNIT
RAK-35R
XB
RAC-35W
XB
1 PHASE,50HZ,220-230V
910 (250 1,400)
4.81-4.60
3.50 (0.90 4.00)
11,940 (3,070 13,650 )
95 (250 1,600)
5
4.93-4.72
4.00 (0.90 4.80)
14,330 (3,070 16,380)
900
750(+65)
295
548
210
288(+27.5)
11
34
RAK-35RXB
RAK-50RXB
90
RAK-50RXB
RAC-50WXB
-
-
o
o
o
o
o
o
INDOOR UNIT
OUTDOOR UNIT
RAK-50R
XB
RAC-50W
XB
1 PHASE,50HZ,220-230V
1,560 (500 2,100)
7.30-6.98
5.00 (1.90 5.20)
17,060 (6,480 17,740)
1,560 (500 2,700)
7.45-7.12
5.80 (2.20 7.00)
20,470 (7,510 24,910)
900
800(+63)
295
736
210
350(+35.5)
11
49.5
After installation

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Summary of Contents for Hitachi RAK-18QXB

  • Page 1: Table Of Contents

    14,330 (3,070 16,380) 20,470 (7,510 24,910) 750(+65) 750(+65) 800(+63) DIMENSIONS (mm) 288(+27.5) 288(+27.5) 350(+35.5) NET WEIGHT (Kg) 49.5 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-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB FAN MOTOR 30W (DC325V) 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 YES(IC)
  • Page 7 Figure showing the installation of lndoor unit MODEL RAK-18QXB RAK-25RXB RAK-35RXB RAK-50RXB 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 Main PCB. SWITCH POSITION CAPACITY SELECTION 1.2kW 1.8kW 1.2kW 1.2kW 1.8kW 1.8kW NOTE: FACTORY default setting is at 1.8kW capacity. This setting is applicable for RAK-18QXB only. - 8 -...
  • Page 9: How To Use

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  • Page 23 AUTO SWING OPERATION ■ To start Vertical Auto Swing Press (AUTO SWING (VERTICAL)) button. The ● deflector(s) will start to swing up and down. is displayed on the LCD. ■ To cancel Vertical Auto Swing Press (AUTO SWING (VERTICAL)) button again. The ●...
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  • Page 29: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB INDOOR UNIT 369.5 231.5 231.5 19 .3 4 55 (RAK-18 Q XB, RAK-25/35RXB) 12.7 (RAK-50RXB) More than More than 50mm 50mm Service space - 29 -...
  • Page 30: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB 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 31: Wiring Diagram

    WIRING DIAGRAM RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB - 31 -...
  • Page 32 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RAR - 6N1 SWB~SW10 Carbon SW Reset carbon SW - 32 -...
  • Page 33: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAK-18QXB POWER FOR CLEANNESS - 33 -...
  • Page 34 CIRCUIT DIAGRAM MODEL RAK-25RXB,RAK-35RXB,RAK-50RXB POWER FOR CLEANNESS - 34 -...
  • Page 35: Block Diagram

    BLOCK DIAGRAM RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB MODEL INDOOR UNIT Outdoor unit Indoor / Outdoor interface circuit DC fan motor Indoor DC fan motor drive circuit Control Power circuit Operation Reset circuit Indicating lamp Timer ECO Sensor Buzzer circuit Wireless receive Wireless remote /send circuit...
  • Page 36: Basic Mode

    MODEL RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB 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 37 For the multi indoor unit MODEL RAK-18QXB(1.8KW) RAK-18QXB(1.2KW) RAK-25RXB RAK-35RXB RAK-50RXB REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE PROM NO. LABEL NAME OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE...
  • Page 38 For the single indoor unit Table 1 Mode data file MODEL RAK-25RXB RAK-35RXB RAK-50RXB VALUE LABEL NAME WMAX 5100 min-1 6700 min-1 5500 min-1 WMAX2 5100 min-1 6700 min-1 5500 min-1 WSTD 4300 min-1 5700 min-1 4800 min-1 WJKMAX 3600 min-1 5500 min-1 4100 min-1 WBEMAX...
  • Page 39 ,for RAK-50RXB 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 40 for RAK-50RXB 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 41 ,for RAK-50RXB 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 42 (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 43 ,for RAK-50RXB 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 44 FCLN_WAM_P FCLN_SDF_P CLNCMP SILENT Silent button Indoor WSZMAX/CSZMAX Compresson speed Outdoor Notes: Can’t set POWERFUL and SILENT at the same time. - 44 -...
  • Page 45 Same as Basic Heating operation (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. STARCPIL (4) Defrost is inhibited for 20 minutes after the start of the powerful operation.
  • Page 46 RAK-1 8 Q XB RAK-25RXB RAK-35RXB RAK-50RXB 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 47: Refrigerating Cycle Diagram

    MODEL RAK-18QXB,RAK-25RXB,RAK-35RXB COOLING CYCLE INDOOR UNIT OUTDOOR UNIT Outdoor unit HEATING CYCLE INDOOR UNIT OUTDOOR UNIT Outdoor unit - 47 -...
  • Page 48 MODEL RAK-50RXB COOLING CYCLE INDOOR UNIT OUTDOOR UNIT Outdoor unit HEATING CYCLE INDOOR UNIT OUTDOOR UNIT Outdoor unit - 48 -...
  • Page 49: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAK-18QXB,RAK-25RXB CAUTION RAK-35RXB,RAK-50RXB 1. Front Panel • Remove and attach the front cover to the direction as shown in the Be sure to hold the front panel with both hands figure to ensure no damage occurs to detach and attach it.
  • Page 50 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. Fig. 4 (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 51: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB MODEL 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 52 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 53 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 54 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 55 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 56 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 57 DSW1 R695 R903 R741 R905 R740 R906 R642 DSW1 - 57 -...
  • Page 58 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 59 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 60 13. Infrared human presence sensor circuit Sensor P.W.B Indoor main P.W,B Microcomputer Infrared sensor Fig.13 1 ・ With the infrared sensor,the air conditioner can detect the activity level in a room and adjust the temperature and humidity automatically,thus achieving the purpose of energy saving. ・When the activity level in a room is detected,the infrared sensor will be in operation.
  • Page 61: Service Call Q&A

    SERVICE CALL Q&A RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB 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...
  • Page 62 Common, etc. In "automatic fan speed" mode, the In fan speed "automatic" mode, 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 63: 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 64 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-18QXB,RAK-25RXB,RAK-35RXB,RAK-50RXB ELECTRICA L. COVER 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), CN9 、CN15、CN19 (stepping motor) , CN2 (fan motor)and CN16 P.W.B.(INDICATION) .
  • Page 65 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 66 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 67 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 68 - 68 -...
  • Page 69 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 - 69 -...
  • Page 70 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 71: Various Settings

    3 and page 38 - 71 -...
  • Page 72 RAR-6N1, RAR-6N2, RAR-6N3, RAR-6N4, RAR-6N5 ) Please set the DIP switch No.6 to ON accordingly (Refe to page - 72 -...
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  • Page 75 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 76 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 77 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 78 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 79 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 80 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 81 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 82 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 83 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. ・...
  • Page 84 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 85 5.Failure phenomenon:The eco sensor lamp is blinking(on for 4 seconds,off for 1 second) <Situation> The eco sensor lamp is blinking(on for 4 seconds,off for 1 second) The infrared human presence sensing function can not be in operation or the sense is blunt. 「Timer lamp is blinking for 20 times」is kept in self-diagonsis memory function.
  • Page 86 6. 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. 7.
  • Page 87 10 . 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 88: Indoor Fan Motor

    11. 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 89 12. 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 90: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-18QXB、R A K - 25RX B R A K - 3 5R X B、R AK - 50RX B - 90 -...
  • Page 91 INDOOR UNIT HHAW PARTS NO Q'TY PARTS NAME /UNIT RAK-25RXB RAK-35RXB RAK-50RXB RAK-18QXB 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 905 HWRAK-50RXB 901 EVAPORATOR ASS'Y...
  • Page 92 RAK-18QXB HHAW NO. 0088E-1 RAK-25Rx X B RAK-35RXB RAK-50RXB - 92 -...

This manual is also suitable for:

Rak-35rxbRak-50rxbRak-25rxb

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