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Hitachi RAK-25PSEW Service Manual
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Hitachi RAK-25PSEW Service Manual

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I N D O O R U N I T
RAK-25PSEW
RAK-35PSEW
RAK-50PSEW
RAK-25PSES
RAK-35PSES
RAK-50PSES
RAR-6NE2
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(mm)
H
D
NET WEIGHT
(kg)
O U T D O O R U N I T
RAC-25WSE
RAC-35WSE
RAC-50WSE
INDOOR UNIT
OUTDOOR UNIT
RAK-25PSEW
RAC-25WSE
RAK-25PSES
1PHASE,50HZ,220V-230V
490
2.26-2.16
2.50(0.50～3.40)
8,530(1,710～11,600)
621
2.85-2.73
3.20(0.60～5.80)
10,920(2,050～19,790)
795
792
250
600
294
299
11
37
INDOOR UNIT + OUTDOOR UNIT
JCH-WH
RAK-25PSEW / RAC-25WSE
RAK-35PSEW / RAC-35WSE
RAK-50PSEW / RAC-50WSE
RAK-25PSES / RAC-25WSE
RAK-35PSES / RAC-35WSE
RAK-50PSES / RAC-50WSE
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS
HOW TO USE
CONSTRUCTION AND DIMENSIONAL DIAGRAM
MAIN PARTS COMPONENT
WIRING DIAGRAM
WIRING DIAGRAM OF THE PRINTED WIRING BOARD
BLOCK DIAGRAM
BASIC MODE
REFRIGERATING CYCLE DIAGRAM
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY
DESCRIPTION OF MAIN CIRCUIT OPERATION
SERVICE CALL Q&A
TROUBLE SHOOTING
PARTS LIST AND DIAGRAM
DC INVERTER
INDOOR UNIT
OUTDOOR UNIT
RAK-35PSEW
RAC-35WSE
RAK-35PSES
1PHASE,50HZ,220V-230V
778
3.56-3.40
3.50(0.50～4.10)
11,940(1,710～13,990)
800
3.65-3.50
4.00(0.60～6.60)
13,650(2,050～22,520)
795
792
250
600
294
299
11
37
1
NO.0124E
CONTENTS
33
36
38
41
45
46
62
63
67
98
103
136
INDOOR UNIT
OUTDOOR UNIT
RAK-50PSEW
RAC-50WSE
RAK-50PSES
1PHASE,50HZ,220V-230V
1,389
6.33-6.05
5.00(1.90～5.20)
17,060(6,480～17,740)
1,622
7.38-7.06
6.00(2.20～7.00)
20,470(7,510～23,380)
795
800
250
736
294
350
11
51
After installation
6
9

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  • Page 1 JCH-WH NO.0124E RAK-25PSEW / RAC-25WSE RAK-35PSEW / RAC-35WSE RAK-50PSEW / RAC-50WSE RAK-25PSES / RAC-25WSE RAK-35PSES / RAC-35WSE RAK-50PSES / RAC-50WSE I N D O O R U N I T O U T D O O R U N I T...

  • Page 2: Safety During Repair Work

    SAFETY DURING REPAIR WORK 1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work. 2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.
  • Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufactures during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned.) 2.
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of Al. stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1MΩ (1/2W) Staple Earth wire Fig.3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate...
  • Page 5 CAUTION In quiet or stop operation, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and turn off the circuit breaker for safety. In the event of power failure,the room air conditioner will restare automatically in the previously selected mode once the power is restored.

  • Page 6: Specifications

    SPECIFICATIONS RAK-25/35/50PSEW MODEL RAC-25/35WSE RAC-50WSE RAK-25/35/50PSES FAN MOTOR 47W (DC120-380V) 30W (DC 325V) FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR GSD102UKQA6JT6A GSD141UKQA8JT6 – COMPRESSOR MOTOR CAPACITOR OVER HEAT PROTECTOR OVERLOAD PROTECTOR YES(INTERNAL) FUSE (for MICRO COMPUTER) 3.15A 15A, 2A, 3A,3.15A 25A, 2A, 3A,3.15A POWER RELAY, STICK RELAY HF161F...
  • Page 7 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-25PSEW/RAC-25WSE RAK-35PSEW/RAC-35WSE RAK-25PSES/RAC-25WSE RAK-35PSES/RAC-35WSE Above 50mm (Above 100mm when there is piping connection at the back of the outdoor unit) Be sure to com pletely seal Above 50mm Above 50mm any gap with putty.
  • Page 8 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-50PSEW/RAC-50WSE RAK-50PSES/RAC-50WSE Above 50mm (Above 100mm when there is piping connection at the back of the outdoor unit) Be sure to com pletely seal Above 50mm Above 50mm any gap with putty. The space indicated by an arrow is to guarantee...

  • Page 33: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-25/35/50PSEW RAK-25/35/50PSES Unit : mm Top air suction grille Front panel Mounting plate Air outlet Horizontal air deflector Vertical air 17.5 17.5 deflector 19.3 Drain Drain cap connection port Drain hose When piping is drawn from the left side, exchange the drain hose for the drain cap.
  • Page 34 MODEL RAC-25WSE, RAC-35WSE Unit : mm AIR SUCTION View from the rear Drain hole Drain hole Drain hole...
  • Page 35 MODEL RAC-50WSE...

  • Page 36: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications MODEL RAK-25/35/50PSEW,RAK-25/35/50PSES THERMOSTAT MODEL OPERATION MODE COOL HEAT 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...

  • Page 37: Compressor Motor

    COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-25/35WSE RAC-50WSE GSD102UKQA6JT6A GTD141UKQA8JT6 COMPRESSOR TYPE POWER SOURCE 220 - 350 V 220 - 350 V OUTPUT 1400W 790W WHITE YELLOW 2M= 1.354 2M= 1.354 RAC-25/35/50WSE 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 38: Wiring Diagram

    WIRING DIAGRAM MODEL RAK-25/35/50PSEW,RAK-25/35/50PSES INDOOR UNIT WIRELESS CLEANING REMOTE CONTROL LIMIT SW CLEANING UNIT MOTOR INDOOR FAN MOTOR INDICATING P.W.B RECEIVE/HUMIDITY P.W.B CN18 CN16 CN17 BLK CN24 CN30A CN8 RED CN10 BLK 3.15A FUSE MAIN P.W.B POWER CIRCUIT GRN+YEL CN20 CN15 CN9 BLK CN22 BLK...

  • Page 39: Outdoor Unit

    MODEL RAC-25WSE,RAC-35WSE OUTDOOR UNIT...
  • Page 40 MODEL RAC-50WSE OUTDOOR UNIT...
  • Page 41 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RZEA15340 COM4 COM3 COM4 COM3 COM5 COM2 COM5 COM2 COM6 COM1 COM6 COM1 COM7 COM0 COM7 COM0 SEG0 SEG13 SEG0 SEG13 SEG1 SEG14 SEG1 SEG14 SEG2 SEG15 SEG2 SEG15 SEG3 SEG16 SEG3 SEG16 BAT0...
  • Page 42 MODEL RAK-25/35/50PSEW,RAK-25/35/50PSES...
  • Page 43 MODEL RAC-25WSE,RAC-35WSE...
  • Page 44 MODEL RAC-50WSE...

  • Page 45: Block Diagram

    BLOCK DIAGRAM MODEL RAK-25PSEW/RAC-25WSE RAK-35PSEW/RAC-35WSE INDOOR UNIT OUTDOOR UNIT RAK-50PSEW/RAC-50WSE RAK-25PSES/RAC-25WSE RAK-35PSES/RAC-35WSE RAK-50PSES/RAC-50WSE 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...
  • Page 46 MODEL RAK-25/35/50PSEW, RAK-25/35/50PSES 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 47 Table 1 Mode data file RAK-25PSEW RAK-35PSEW RAK-50PSEW MODEL RAK-25PSES RAK-35PSES RAK-50PSES LABEL NAME VALUE WMAX 4700 min-1 5450 min-1 5300 min-1 WMAX2 5600 min-1 6500 min-1 6700 min-1 WSTD 3000 min-1 3550 min-1 4200 min-1 CMAX 3150 min-1 4600 min-1...
  • Page 48 1℃ 1℃ 1℃ yneof_8u 25℃ 25℃ 25℃ wjkmax_8u 2900min-1 3400min-1 3600min-1 wbemax_8u 2700min-1 3200min-1 3300min-1 wszmax_8u 2600min-1 3000min-1 3000min-1 sftlvhm_8u RAK-25PSEW RAK-35PSEW RAK-50PSEW MODEL RAK-25PSES RAK-35PSES RAK-50PSES tdf411_8u tdf412_8u tdf413_8u tdf411_cmp_8u 3000min-1 3000min-1 3000min-1 tdf412_cmp_8u 2400min-1 tdf413_cmp_8u 1800min-1 defcmp_off_8u defben_std_8u...
  • Page 49 +2.66 +1.33 +0.66 remote control -0.66 [fzontmc*-8u] Fan speed set to"aoto" Stop Start Stop Start Start/stop switch Thermo judgment Thermo off Ultra-hi indoor silent Ultra-Lo Operation lamp CMAX NOTE(5) NOTE(9) Rating compressor rotation start speed Outdoor fan reversing valve (heating "on" mode) Notes: (1) Condition for entering into Cool Dashed mode.
  • Page 50 Silent heating (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 51 Basic Dehumidifying Operation Start Stop Start Stop Thermo-OFF Thermo-OFF Lo silent Ultra-Lo heating Notes: (1) 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 silent” 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 52 (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTD. (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 53 20 sec heating 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 54 Reversing valve defrosting 15' or more Auto fresh defrosting Over defrosting inhibit period Fan speed Stop set to "Hi" Start/Stop button Defrost signal Preheating released Preheating released Preheating judgment Preheating Indoor fan Ultra-Lo Hi or Lo Outdoor fan Hi or Lo Operation lamp Reversing valve(cooling (冷房通電）...
  • Page 55 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 56 Frost wash Cooling、Heating、 Frost wash operation Dehumdify operation Defrosting period Fan period 1 Blance period Frost period Heating period 1 Stop period 1 Heating period 2 Stop period 2 Fan period 2 frzcl n_blnce_tm clntim_def1 clntim_suf1_frz1 clntim_wam1_frz1 clntim_stp1_frz1 clntim_wam2_frz1 clntim_stp2_frz1 clntim_suf2_frz1 ※1 (AUTO) frzcln_souf1_tm...

  • Page 57: Operation Conditions

    operation control (1) Pre-filter cleaning system Types of cleaning operation Automatic cleaning: Cleaning conducted automatically when the product is stopped Forcible cleaning: Cleaning conducted when the product is continuously operated Manual cleaning: Cleaning conducted by using the MANUAL CLEANING mode on the remote control unit (i) Cleaning unit reciprocated + (ii) cleaning lamp + (iii) horizontal air deflector closed + (iv)tap for indoor unit only *For forcible cleaning, (iii) is open *Indoor unit: The special-purpose tap is on a super-slight wind level.

  • Page 58: Manual Cleaning

    operation control (3) Pre-filter cleaning system Forcible cleaning If the air-conditioner has run for more than 24 consecutive [hours], stop it and clean it forcibly. After the cleaning is over, reset it. Manual cleaning (1) This operation aims to make the product ready for use after having left the air-conditioner unused for a long time.
  • Page 59 Operation diagram 2 for filter cleaning (manual and forcible cleaning) 24 consecutive Manual cleaning hours later Forcible cleaning Continued from No. 1 Power Operation stop key Manual cleaning possible more than 5 minutes after the last cleaning and Sleep key when the product is stopped.
  • Page 60 Operation diagram for filter cleaning 4 (remarks) 4. Forcible cleaning 1. Cleaning in general (1) This will not be activated during,air-conditioner cleaning,or (1) If, during cleaning, the remote control is used to start the auto-fresh. air-conditioner by cooling, heating, or other operation, (2) This will not be activated while the sleep timer is on.
  • Page 61 Operation diagram for filter cleaning (error detection 2) Arrival error (lock) 1. If the limit switch is not detected 200" Power (= 170" +30":30" is the safety time) Cleaning initiated after startup, the product will be considered Product command to have an arrival error. 2.

  • Page 62: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAK-25PSEW/RAC-25WSE, RAK-35PSEW/RAC-35WSE RAK-25PSES/RAC-25WSE, RAK-35PSES/RAC-35WSE OUTDOOR UNIT INDOOR UNIT Silencer Silencer MODEL RAK-50PSEW/RAC-50WSE RAK-50PSES/RAC-50WSE OUTDOOR UNIT INDOOR UNIT Silencer Silencer...

  • Page 63: Procedure For Disassembly And Reassembly

    PROCEDURE FOR DISASSEMBLY AND REASSEMBLY MODEL RAK-25/35/50PSEW, RAK-25/35/50PSES 1. Front panel 2.Fancy cover (1) Open the front panel (1) Unscrew the terminal board cover and the fancy cover. • Hold the lower of the front panel with both hands. • If it is raised further, the front panel may be damaged. Screw Terminal cover...

  • Page 64: Cleaning Unit

    3. Cleaning unit 6. The dust catcher Remove the lead wrie and ground wire from the electrical Remove the dust catcher as shown with arrows. parts box(CN8,CN10). If dust is accumulated at the inner side of the dust catcher, Release the lower claws(x 3) and put your hand into the remove the dust with a vacuum cleaner.
  • Page 65 (3) Pull fan motor out of the remove the right. indication box wire WIFI cable ( 4 ) Remove the screws from the upper and lower bearing covers. ( 5 ) Remove the locking hook of the lower bearing cover from the Cabinet. Cabinet (2) Install the front cover;...

  • Page 66: Electrical Parts

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

  • Page 67: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-25/35/50PSEW, RAK-25/35/50PSES ・ ・ ・...

  • Page 68: Reset Circuit

    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 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 69 3. Drive circuit of the indoor fan motor Fig. 3-1 < The circuit check (For test) > < Pin 6 - Pin 4 voltage one example > Name Test point Test voltage 1300min - Motor drive power About 325V CN2 1 pin- 4 pin About 15V Motor contorl power CN2 5 pin- 4 pin...
  • Page 70 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 71 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 72 7. Temporary Switch Circuit MICROCOMPUTER Temporary switch R405 TEMPORARY SW SW831 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 73 DSW1...
  • Page 74 11. Indoor/outdoor communication circuits Indoor unit side Outdoor unit side Inverter circuit Outdoor C302 microcomputer Indoor transmission circuit Indoor microcomputer 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 Fig.
  • Page 75 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 76 13. Infrared human presence sensor circuit Indoor main P.W,B Sensor P.W.B Microcomputer (1/2) (2/2) R731 Infrared sensor C630 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. ・...
  • Page 77 1 . Cleaning unit drive circuit R946 Vcc2(5V) Microcomputer IC601 vertical Ventilator power (Lo, OFF; Hi, ON) Clock signal STBY signal Excitation mode setting Forward/reverse signal Cleaning unit driving motor Vref setting Vcc2(5V) Cleaning Id Cleaning unit position detection switch, right Vcc2(5V) vertical Black...
  • Page 78 The cleaning unit drive circuit comes equipped with a current detection circuit. Normally it runs in silent mode. When the load increases, however, it will switch to high-power mode and increase the torque of the cleaning unit driving motor. The peak motor current in silent mode is about 83 mA, with the peak motor current in high power mode being between about 200 mA and 300 mA.
  • Page 79 RL1 RL2...
  • Page 80 Load side is a high voltage line, please be careful from electric shock and install the Indica•on Lamp as near as possible to the Relay Kit. The maximum length of the wiring cable should be below 100m.
  • Page 81 DESCRIPTION OF MAIN CIRCUIT OPERATION RAC-25/35WSE 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

    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 (4-way valve) control circuit ・ This model is equipped with a reversing valve ※Voltage measurement timing (4-way Valve). ・ Forced cooling The reversing valve (4-way Valve) "slides" the switch (Test switch) valve in the specified direction for each operating mode and switches the route of Reversing valve refrigerant and holds the route with a built-in...
  • Page 85 HIC P.W.B 70 74 75...
  • Page 86 6. Electric expansion valve circuit...
  • Page 87 2A Fuse DC300 -330V...
  • Page 88 60 100 ( DC300-330V )
  • Page 89 50WSE 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 (4-way valve) control circuit ・ This model is equipped with a reversing valve ※Voltage measurement timing (4-way Valve). ・ Forced cooling The reversing valve (4-way Valve) "slides" the switch (Test switch) valve in the specified direction for each operating mode and switches the route of Reversing valve refrigerant and holds the route with a built-in...
  • Page 94 HIC P.W.B 70 74 75...
  • Page 95 6. Electric expansion valve circuit...
  • Page 96 2A Fuse DC300 -330V...
  • Page 97 30 60 ( DC300-330V )

  • Page 98: Service Call Q&A

    SERVICE CALL Q&A RAK-25/35/50PSEW, RAK-25/35/50PSES 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 99 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 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 Cleaning unit ・For an operation check on filter cleaning, the After power-on (after connecting power plug, after a power failure, cleaning unit will make one go and return. At that time, the "clean" lamp will go on. after the breaker is turned on), the ・The one-time operation check will last about 7 product will begin cleaning its filter.
  • Page 102 ・Are the micro-mesh, stainless steel filter, dust catcher, The cleaning unit has stopped midway. and filter cleaning wiper, and wiper cover correctly installed? (The "clean lamp" will go on for 4 seconds and off for 1 second.) ・There may occur cleaning unevenness depending on The micro-mesh and stainless steel filter remain dirty.

  • Page 103: Troubleshooting

    TROUBLE SHOOTING MODEL RAC-25/35/50WSE Inspection instructions RAC-50WSE RAC-25/35WSE 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 0V line 0V line Note that the 0 V line of the outdoor electrical parts and Control circuit...

  • Page 104: Other Instructions

    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 105: Troubleshooting Support

    Troubleshooting support unction 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 106 Self-diagnosis display function (indoor side display) While the "timer lamp" , 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 TIMER LD301 CODE MEANING MEANING MEANING LAMP BLINKING BLINKING Normal When the indoor heat exchanger 1.Reversing valve defective temperature is too low in the heating 2.Heat exchanger thermistor disconnected. 1 time Refrigerant cycle fault mode or it is too high in the cooling mode. (only in heating mode) It is not failure.
  • Page 109 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-25/35WSE...
  • Page 110 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-50WSE...

  • Page 111: 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 112 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 113 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 114 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 115 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 116 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 117 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 118 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 Microcomputer peripheral circuit ・...
  • Page 119 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 120 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 121 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 122 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 123 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 CN27of 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 124 After turning on the power, perform air purification by remote control. If there is not the air purifier and operating function,setting to 32 by the remote control,and operate in the cooling mode. Is there 230V AC between Is the LD301 turned on? Ensure the power supply.
  • Page 125 * This page is for RAC-25/35WSE 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 126 Check the blinking frequency of the LD301. * This page is only for RAC-50WSE 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 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 128 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 129 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-42/50WPE only) have Change the outdoor ele.
  • Page 130 HOW TO CHANGE THE SHIFT VALUE FOR SETTING TEMPERATURE The shift value for setting temperature of COOLING or HEATING operation can be changed with the remote controller. (This procedure should be done only by service personnel.) It is possible to reduce or increase in 3 degrees from the initial setting value. (SHIFTC and SHIFTW : ref.
  • Page 131 How to set prevention of mutual interference for remote controller [ Remote controller model : RAR-6NE2 ] In this case : 2 sets indoor units are installed near to each other. If both indoor unit can receive a remote controller signal, please set as below. ( This setting change the signal addres of remote controller.) Initial setting is A．...
  • Page 132 OPERATION MODE LOCK SETTING When the Dip-switch of indoor unit is changed into "Heating mode only" or "Cooling mode only", the remote controller also needs to be changed into operation mode lock setting. (Refer to Page *73 *) If the setting of remote controller is not changed , the indoor unit and the remote controller can not been match.
  • Page 133 DISPLAY OPERATION MODE SETTING This is the remote controller setting method for operating indoor unit independently by display etc. New communication format(Between indoor and outdoor) is required to communicate with outdoor unit. So this setting is required in order to operate indoor unit independently. PROCEDURE 1.
  • Page 134 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 135: 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 136: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-25/35/50PSEW、RAK-25/35/50PSES...
  • Page 137 MODEL RAK-25/35/50PSEW,RAK-25/35/50PSES JCH-WH PARTS NO Q'TY/ PARTS NAME UNIT RAK-25PSEW RAK-35PSEW RAK-50PSEW RAK-25PSES RAK-35PSES RAK-50PSES CABINET ASSEMBLY HWRAK-18RPD A10 DRAIN HOSE HWRAK-25PSEW A02 COVER (REAR) (RIGHT) HWRAK-18PSPA 919 DRAIN CAP HWRAK-18RPD A02 STEPPING MOTOR HWRAK-25PSEW A03 STEPPING MOTOR HWRAK-25PSEW A04...
  • Page 138 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL: RAC-25WSE、RAC-35WSE...

  • Page 139: Parts Name

    MODEL RAC-25WSE,RAC-35WSE JCH-WH PARTS NO Q'TY/UNIT PARTS NAME RAC-25WSE RAC-35WSE HWRAC-50WPC A01 BASE HWRAC-25WXD A01 COMPRESSOR HWRAC-50NX2 A04 PUSH NUT HWRAC-25WXD A02 CONDENSER HWRAC-25WXD A03 REVERSING VALVE ASSEMBLY HWRAC-10GH5 A03 SERVICE VALVE HWRAC-50WEA A06 SERVICE VALVE HWRAC-50WED A03 ELECTRIC EXPANSION VALVE HWRAC-25WXD A04 SOUND PROOF HWRAC-25WXD A05...
  • Page 140 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL: RAC-50WSE...
  • Page 141 MODEL RAC-50WSE JCH-WH PARTS NO Q'TY/UNIT PARTS NAME RAC-50WSE HWRAC-50WXD A01 BASE HWRAC-50WXD A02 COMPRESSOR HWRAC-50WEC A08 SOUND PROOF HWRAC-50NX2 A04 PUSH NUT HWRAC-50WXD A03 CONDENSER HWRAC-50WSE A01 REVERSING VALVE ASSEMBLY HWRAC-50WEA A05 SERVICE VALVE HWRAC-50WEA A06 SERVICE VALVE HWRAC-50WED A03 ELECTRIC EXPANSION VALVE HWRAC-50WXD A05 SOUND PROOF...
  • Page 142 RAK-25PSEW / RAC-25WSE JCH-WH NO. 0124E RAK-35PSEW / RAC-35WSE RAK-50PSEW / RAC-50WSE RAK-25PSES / RAC-25WSE RAK-35PSES / RAC-35WSE RAK-50PSES / RAC-50WSE...

This manual is also suitable for:

Rac-25wseRak-35psewRac-35wseRak-50psewRac-50wseRak-25pses ... Show all

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