Hitachi RAK-18PSPA Service Manual
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Hitachi RAK-18PSPA Service Manual

Indoor/outdoor unit
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See also: Instruction Manual , Installation Manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-35WSPA
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
JULY 2013
RAS_AW_000covere
INDOOR UNIT
RAK-18PSPA
RAK-25PSPA
RAK-35PSPA
INDOOR UNIT
OUTDOOR UNIT
RAK-18PSPA
RAC-18WSPA
1 PHASE,50HZ,220-230V
300 (
70
880)
1.70-1.70
1.80 (0.50 2.80)
6,120 (1,700 9,520)
375 (65 1,620)
2.10-2.00
2.30 (0.60 4.80)
7,820 (2,040 16,320)
780
792
280
600
218
299
8.0
44
INDOOR UNIT + OUTDOOR UNIT
Hitachi Household Appliances(Wuhu) Co., Ltd.
HHAW
RAK-18PSPA/RAC-18WSPA
RAK-25PSPA/RAC-25WSPA
RAK-35PSPA/RAC-35WSPA
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ---------------------------------------------------------------------- 8
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 27
MAIN PARTS COMPONENT --------------------------------------------------- 29
WIRING DIAGRAM ---------------------------------------------------------------- 31
CIRCUIT DIAGRAM --------------------------------------------------------------- 33
BLOCK DIAGRAM ----------------------------------------------------------------- 35
BASIC MODE ----------------------------------------------------------------------- 36
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 46
Procedure for Disassembly and Reassembly
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 49
TROUBLE SHOOTING ----------------------------------------------------------- 69
PARTS LIST AND DIAGRAM --------------------------------------------------97
DC INVERTER
INDOOR UNIT
OUTDOOR UNIT
RAK-25PSPA
RAC-25WSPA
1 PHASE,50HZ,220-230V
490(70 960)
2.70-2.60
2.50 (0.50 3.40)
8,500 (1,700 11,560)
585 (65 2,250)
3.10-3.00
3.20 (0.60 5.80)
10,880 (2,040 19,720)
780
792
280
600
218
299
8.0
44
0073
--------------------------------------
47
INDOOR UNIT
OUTDOOR UNIT
RAK-35PSPA
RAC-35WSPA
1 PHASE,50HZ,220-230V
845 (70 1350)
4.30-4.20
3.50 (0.50 4.10)
11,900 (1,700 13,940)
830 (65 2,450 0 )
4.30-4.10
4.00 (0.60 6.60)
13,600 (2,040 22,440)
780
792
280
600
218
299
8.0
44
After installation

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  • Page 1: Table Of Contents

    7,820 (2,040 16,320) 10,880 (2,040 19,720) 13,600 (2,040 22,440) (B.T.U./h) DIMENSIONS (mm) NET WEIGHT (Kg) After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT JULY 2013 Hitachi Household Appliances(Wuhu) Co., Ltd. RAS_AW_000covere...
  • 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 operation or stopping the running, 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 to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Rac-18Wspa

    SPECIFICATIONS RAK-18PSPA RAC-25WSPA RAC-18WSPA RAK-25PSPA MODEL RAC-35 SPA RAK-35PSPA 25W (DC35V) 47W (DC120~380V) FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – EU125XB2 EU125XB2 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.15A POWER RELAY G4A-1A POWER SWITCH...
  • Page 7 Figure showing the installation of lndoor and Outdoor unit MODEL RAK-18PSPA/RAC-18WSPA RAK-25PSPA/RAC-25WSPA RAK-35PSPA/RAC-35WSPA above 50mm above 50mm above 50mm Be sure to completely seal any gap with putty. 2,300 mm or more Plug plug (Procure locally) The indoor piping should be insulated with the enclosed insulation pipe.

  • Page 27: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-18PSPA ,RAK-25 PSPA ,RAK-35PSPA INDOOR UNIT ( 12.7) (RAK-18/25/35PSPA) More than More than 50mm 50mm Service space...
  • Page 28 CONSTRUCTION AND DIMENSIONAL DIAGRAM RAC-18/25/35WSPA MODEL　 OUTDOOR UNIT Unit : mm 　 NOTE: 1.For outdoor unit installation , allow at least (2) sides of space around the unit ensure ventilation f ue. 2.The connecting pipe , should all the insulated with insulation pipe. 3.Piping length is within (20m).

  • Page 29: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications K 1 PSPA,RAK-25PSPA,RAK-35PSPA 15.3 (62.1) 16.7 (62.1) INDICATION 15.0 (60.8) 17.3 (63.1) TEMPERATURE 23.3 (76.5) 24.7 (76.5) INDICATION C ( F) 23.0 (75.2) 25.3 (77.5) 31.3 (90.9) 32.7 (90.9) INDICATION 31.0 (89.6) 33.3 (91.9) FAN MOTOR Fan Motor Specifications...
  • Page 30 COMPRESSOR Compressor Motor Specifications RAC-18WSPA,RAC-25WSPA,RAC-35WSPA EU125XB2 PUMP TYPE SCROLL OUT PUT 1000W REFRIGERANT R-410A APPROVED MOTOR VOLTAGE 400V MAX (DC VOLTAGE) WHITE CONNECTION YELLOW 2.23 20˚C 2.23 (68˚F) 2.23 RESISTANCE VALUE (Ω) 75˚C (167˚F) (RED)X (WHITE)U (YELLOW)V 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 31: Wiring Diagram

    WIRING DIAGRAM CAUTION / 3 5 P SP A The marked parts very important ones for safety. NOTE 1.Connecting cable 1.5mm dia.x2 (C D line) is used for the connection.
  • Page 32 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RAR- 5 E2...

  • Page 33: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAK-18/25/35PS PA...
  • Page 34 MODEL RAC-18/ 25/ 35WSPA...

  • Page 35: Block Diagram

    OUTDOOR UNIT Outdoor DC fan motor INDOOR UNIT MODEL RAK-18/ 25/ 35PSPA RAC-18/ 25/ 35WSPA HARMONICS POWER RELAY IMPROVEMENT RECTIFIER CIRCUIT Inrush current DC compressor Protection circuit motor Rotor magnetic pole position detection circuit Wireless receive Wireless remote Buzzer circuit circuit control Operation.

  • Page 36: Basic Mode

    BASIC MODE MODEL RAK-18/ 25/ 35PSPA Operation mode n i l y f i Auto Basic operation of Start Stop Start Stop Start / stop switch start / stop switch Operation lamp Start / stop switch Reserve switch Cancel switch Operation lamp Off-timer Timer lamp...
  • Page 37 Table 1 Mode data file MODEL RAK-18PSPA RAK-25PSPA RAK-35PSPA LABEL NAME VALUE WMAX 4400 min-1 5400 min-1 5700 min-1 WMAX2 4400 min-1 5400 min-1 5700 min-1 WSTD 2150 min-1 2900 min-1 3500 min-1 WJKMAX 2000 min-1 2600 min-1 3000 min-1...
  • Page 38 3min. 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 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 42 Notes: (1) Condition for entering into Hot Dashed mode. When fan set to “Hi” or “Auto mode” and i) Indoor temperature is lower than 18°C, and ii) outdoor temperature is lower than 10°C, and iii) compressor speed (P section) due to temperature difference between setting temperature (including the correction shift only) and room temperature is WMAX or higher.
  • Page 43 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 45 ECO button Cooling:0.66 Dehumidifying:0.66 Set temperature Heating:0.66 Current restrict Compressor speed Notes: Can’t set POWERFUL and ECO at the same time. During FAN operation,can’t set ECO. SILENT Silent button Indoor WSZMAX/CSZMAX Compresson speed Outdoor Notes: Can’t set POWERFUL and SILENT at the same time.

  • Page 46: Refrigerating Cycle Diagram

    MODEL COOLING CYCLE OUTDOOR UNIT INDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT...
  • Page 47 Procedure for Di a embly and Rea embly INDOOR UNIT RAK-18/ 25/ 35PSPA 1. Front Panel 3. Control P .W.B. and Indicating (1)Pull up the washable panel by holding it at both P.W.B. lower sides with both hands. (1)Remove each connector from the lead wire. (2)Remove the four P.W.B.
  • Page 48 OUTDOOR UNIT 4. Tangential air flow fan and fan motor MODEL (1) Remove two screws locking the drain pan. 1. Electrical parts (2) Press to lower the hook at the center of theunit a little and pull the (1)Remove the service value cover lock screws claw forward to removethe drain pan.

  • Page 49: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-18/ 25/ 35PSPA 1. Power circuit CN10 XA-6P-Top Indoor Fan Motor Q131 ICP2 R121 Q111 L111 ICP1 R114 Q113 Q115 D121 Q112 R115 IC121 IC111 Q114 Q751 Q116 IC712 12 V power supply Power supply voltage Indoor fan power supply Indoor fan PWM output Indoor fan speed feedback...
  • Page 50 2. Reset Circuit Reset R523 Microcomputer R522 IC521 Fig.2-1 Timing chart Voltage 5 . 0V pin of IC521 supply voltage RES detecting voltage RES canceling voltage 4 . 4V 4 . 2V Voltage pin of IC521 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 51 3. Fan Motor Drive Circuit CN10 35V line Microcomputer 5V line No. of L751 R751 rotation output Fan Motor Q751 C751 R752 No. of rotation detect R631 C631 Fig. 3-1 The waveform of voltage at the T1 = Low No. of rotation point T2 = High No.
  • Page 52 • When the buzzer sounds, an approx. 3.9kHz square signal is output from buzzer output pin 83 of the micro computer. After the amplitude of this signal has been set to 12Vp-p by a transistor, it is applied to the buzzer. The piezoelectric element in the buzzer oscillates to generate the buzzer's sound.
  • Page 53 6. Initial Setting Circuit (IC401) When power is supplied, the microcomputer reads the data in IC401 (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 IC401; data will not be erased even when power is turned off. Microcomputer C401 External ROM...
  • Page 54 DSW1 R923 R541 R543 DSW1...
  • Page 55 RAC-18/ 25/ 35WSPA TERMINAL BOARD...
  • Page 56 &RQWURO 3:% 0LFURFRPSXWHU $&9 '&9...
  • Page 57 && & & & & / / 6PRRWKLQJ +,& &DSDFLWRU /' 3:% &RQWURO 5HDFWRU FRQQHFWRU 3:% ,30...
  • Page 58 3. Latch-type reversing valve control circuit Timing for voltage measurement This model comes equipped with a latch-type reversing valve. Forcible cooling switch (test switch) The latch-type reversing valve is so designed that its valve is "slid" in a specified direction Reversing valve according to a specific operation mode, thereby switching freezing channels and retaining the...
  • Page 60 5. Electric expansion valve circuit...
  • Page 61 3.15A Fuse Switching power source...
  • Page 62 3.15A 3.15A ( DC260-360V )
  • Page 64 Intelligent power module switches power supply current according to position of the compressor motor rotor. The switching order is as shown in Fig. 7-2. : U + is ON, V - is ON (circuit in Fig. 7-1) At point : U + is chopped (OFF), V - is ON (circuit in Fig. 7-4) At point Upper arm transistor...
  • Page 65 C032 R008 – Fig. 7-4 Power module circuit (U is OFF, V is ON) Since current flows at point B only when U transistor and V – transistor are ON, the current waveform at point B becomes intermittent waveform as shown in Fig. 3. Since current at point B is approximately proportional to the input current of the air conditioner, input current is controlled by using DC current (Id) detection resistor.

  • Page 66: Service Call Q & A

    6(59,&( &$// 4 $ RAK-18/ 25/ 35PSPA &22/,1* 02'( '(+80,',)<,1* 02'( +($7,1* 02'(...
  • Page 67 $872 )5(6+ '()5267,1* $872 23(5$7,21 1,&( 7(03(5$785( 5(6(59$7,21 This is because the preheating device is working. When the heating operation is started, It will not start to drive the fan until the refrigerating the indoor fan does not start cycle warms up and warm air blows. Wait for a while. immediately and the damper at the The damper does not open either during preheating bottom air outlet occasionally does not...
  • Page 68 27+(56...

  • Page 69: Trouble Shooting

    7528%/( 6+227,1* RAC-18/ 25/ 35WSPA PRECAUTIONS FOR CHECKING Power WARNING Remember that voltage of 175 V is applied to the 0V line on the P.W.B. or the like as shown in the right diagram. Always keep your hands and metallic things away WARNING from the cabinet.
  • Page 71 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-18/25/35P ELEC. COVER FIXTURE SCREW FIXTURE SCREW Removing electrical parts When installing the parts, use 1. Remove the electrical parts cover. caution not to pinch any code 2. Remove the connectors from the CN1 (heat exchange between the part and cabinet.
  • Page 73 THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS Function Name Description Self-diagnosis indication function • The “timer lamp” indicates a mode of failure detected <Indicating a failure on the indoor on the indoor or outdoor unit side by blinking unit side> frequency. •...
  • Page 74 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model: K-18/25/35PSPA Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAK- 18/25/35P Interface voltage error Lights for 0.35 sec. at interval of 0.35 sec.) <Cautions>...
  • Page 75 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-18/25/35WSPA...
  • Page 78 OUTDOOR UNIT Remove the compressor connector. LD301(SELF DIAGNOSIS LAMP) • Check the drive If your first attempt With the unit set in the operating circuit (IPM) using fails, wait 3 minutes state, press the cooling/heativg/ the PRD checker. (for the unit to re- dehvmidity button.
  • Page 79 AK-18/25/35PSPA;RAC-18/25/35WSPA...
  • Page 80 &+(&.,1* 7+( ,1'225 81,7 (/(&75,&$/ 3$576...
  • Page 81 → → → → → →...
  • Page 82 ． ……...
  • Page 85 MODEL RAC-18/25/35WSPA...
  • Page 90 &+(&.,1* 7+( 5(027( &21752//(5...
  • Page 92 Please set the DIP switch No.6 to ON accordingly (Refe to page...
  • Page 95 (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 96 Model: RAC- 18/25/35WSPA Do not operate for 5 minutes or more.

  • Page 97: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-18PSPA,RAK-25PSPA,RAK-35PSPA...
  • Page 98 INDOOR UNIT MODEL RAK-18PSPA,RAK-25PSPA,RAK-35PSPA HHAW PARTS NO. Q"TY/ PARTS NAME UNIT RAK-18PSPA RAK-25PSPA RAK-35PSPA HWRAK-18PSPA 901 HWRAK-25PEA HWRAS-E10H3 HWRAK-18PSPA 902 HWRAK-18PSPA 903 HWRAS-E10H3 HWRAK-18PSPA 904 HWRAK-18PSPA 905 HWRAK-18PSPA 906 HWRAS-E10H3 HWRAK-18PSPA 907 HWRAS-E10H3 HWRAS-E10H3 HWRAK-25PEA HWRAK-18PSPA 908 HWRAK-25PSPA 901 HWRAK-35PSPA 901...
  • Page 99 MODEL RAC-18/25/35WSPA...
  • Page 100 MODEL RAC-18WSPA,RAC-25WSPA,RAC-35WSPA HHAW PARTS NO. Q"TY/ PARTS NAME UNIT RAC-18WSPA RAC-25WSPA RAC-35WSPA HWRAC-18WSA BASE HWRAC-18WSA COMPRESSOR HWRAC-18WSA COMPRESSOR RUBBER HWRAC-SX10HAK A04 PUSH NUT HWRAC-18WSA CONDENSER ASSEMBLY HWRAC-18WSPA REVERSING VALVE(INCLUDING 2S/3S-VALVE&EXPANSION VALVE) HWRAC-50WEA 3S-VALVE HWRAC-50WEA 2S-VALVE HWRAC-18WSPA ELECTRIC EXPANSION VALVE HWRAC-18WSPA SOUND PROOF HWRAC-18WSPA SOUND PROOF...
  • Page 101 RAK-18PSPA/RAC-18WSPA HHAW NO. 0073E RAK-25PSPA/RAC-25WSPA RAK-35PSPA/RAC-35WSPA...

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