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Hitachi RAF-50RPA Service Manual
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Hitachi RAF-50RPA Service Manual

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See also: Instruction Manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-50FPA
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE　　
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
ROOM AIR CONDITIONER
JULY 2013
INDOOR UNIT
RAF-50RPA
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
Hitachi Household Appliances(Wuhu) Co., Ltd.
HHAW NO. 00 70E-2
RAF-50RPA
RAC-50FPA
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS......................................
HOW TO USE ........................................
MAIN PARTS COMPONENT ............................
WIRING DIAGRAM ....................................
BLOCK DIAGRAM ....................................
BASIC MODE ........................................
REFRIGERATING CYCLE DIAGRAM ..................
TROUBLE SHOOTING ................................
PARTS LIST AND DIAGRAM ..........................
DC INVERTER
INDOOR UNIT
RAF-50RPA
1 PHASE, 50Hz, 220V - 230V
1,510 (500
6.64 - 6.94
5.0 (1.9
17,060 (6,480
1,660 (500
7.30 - 7.63
6.0 (2.2
20,4
72
(7,5
760
600
235
14
1
CONTENTS
　　
OUTDOOR UNIT
RAC-50FPA
～
2,100)
～
5.2)
～
17,740)
～
2,700)
～
7.3)
～
10
24,
910
)
792 (+95)※
600
299 (+46)※
40
※ After installation
6
8
27
29
31
32
35
36
46
47
52
69
72
97

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Summary of Contents for Hitachi RAF-50RPA

  • Page 1: Table Of Contents

    ～ (B.T.U./h) 20,4 (7,5 792 (+95)※ DIMENSIONS (mm) 299 (+46)※ 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.
  • Page 2 DANGER...
  • 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 1. In quiet operation or stopping the running, its heard slight flowing noise of refrigerant in the refrigerating cycle occasionally, but this noise is not abnormal for the operation. 2. 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: Specifications

    SPECIFICATIONS RAF-50RPA RAC-50FPA MODEL 25W (DC35V) 47W (DC380V) FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR ASG133CDMB7AT COMPRESSOR OVER HEAT PROTECTOR OVERLOAD RELAY FUSE (for MICRO COMPUTER) G4A-1A POWER RELAY, STICK RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER 450NR...
  • Page 7 Figure showing the installation of lndoor and Outdoor unit [Indoor unit installation] Direction of Piping Above 150mm different directions: direct rear piping, Above 200mm right downward piping and right sideways piping. Above 100mm Be sure to completely seal any gap with putty. Plug Drain pipe Must be installed separately.

  • Page 27: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAF-50RPA Unit : mm INDOOR UNIT Wireless remote φ65 Standard underfloor piping position controller Cabinet Front panel Air outlet Infrared receiver Small dia. pipe (φ6.35) Large dia. pipe (φ9.52) Piping hole Piping hole Air inlet...
  • Page 28 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL　 OUTDOOR UNIT Unit : mm 　 NOTE: 1.For outdoor unit installation , allow at least 2 sides of space around the unit ensure ventilation flue 2.The connecting pipe , should all the insulated with insulation pipe. 3.Piping length is within 20m.

  • Page 29: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications MODEL RAF-50RPA THERMOSTAT MODEL OPERATION MODE COOL HEAT 15.3 (62.1) 16.7 (62.1) INDICATION 15.0 (60.8) 17.3 (63.1) 23.3 (76.5) 24.7 (76.5) TEMPERATURE INDICATION ˚C (˚F) 23.0 (75.2) 25.3 (77.5) 31.3 (90.9) 32.7 (90.9)
  • Page 30 RAC-50FPA 2M= 1.65 5Ý& 2M= 1.97 75 Ý& YELLOW WHITE 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. If the color has been changed conspicuously, replace the compressor.
  • Page 31 　 　 Ｃ Ｏ Ｎ Ｔ Ｒ Ｏ Ｌ Ｐ． Ｗ． Ｂ． ※ NOTE 1.Connecting cable 1.5mm dia.x2 (C D line) is used for the connection.

  • Page 32: Wiring Diagram

    WIRING DIAGRAM OF THE PRINTED WIRING BOARD e l l...
  • Page 34 MODEL RAC-50FPA...

  • Page 35: Block Diagram

    BLOCK DIAGRAM INDOOR UNIT 230V L(A) N(B) Wireless receive Wireless remote Buzzer circuit circuit control Filter. Indicating lamp Operation. Timer. Heat exchanger thermistor Room temperature Auto sweep motor 1 thermistor Indoor / Outdoor Temporary switch interface circuit DC fan motor drive Initial setting circuit circuit Reset circuit...

  • Page 36: Basic Mode

    BASIC MODE MODEL RAF- 50RP 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 Timer memory...
  • Page 37 Mode data file REQUIRED VALUE OF UNIT SIDE REQUIRED VALUE OF UNIT SIDE LABEL NAME LABEL NAME RAF-50RPA RAF- 50RP WMAX 6000 FWAH_P 1000 WMAX2 6400 FWH_P 1100 WSTD 4700 FWAHH_P 1000 WJKMAX 4100 FWHH_P 1100 WBEMAX 3600 FCSOY_P FCS_P...
  • 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

    RAF-50RP A/RAC-50FPA COOLING CYCLE OUTDOOR UNIT INDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT...

  • Page 47: Disassembly & Assembly Procedure

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  • Page 51  )$1 02725 $1' 7$1*(17,$/ $,5 )/2: )$1   VFUHZV WKDW DUH WKH IL[DWLRQ RI HYDSRUDWRU DUH UHPRYHG  7KH WDE ZKHUH WKH OHIW VLGH RI HYDSRUDWRU LV IL[HG LV UHPRYHG  (YDSRUDWRU LV OLIWHG XS DQG UHPRYHG (YDSRUDWRU 6FUHZ 6FUHZ  7ZR VFUHZV WKDW LV WKH IL[DWLRQ RI IDQPRWRU VXSSRUW LV UHPRYHG...

  • Page 52: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAF-50RPA 02'(/ 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...
  • Page 53 2. Reset Circuit Reset R523 Microcomputer R522 IC521 Fig.2-1 Timing chart Voltage 5 . 0V ② pin of IC521 supply voltage RES detecting voltage RES canceling voltage 4 . 4V 4 . 2V Voltage ① pin of IC521 output voltage 5.0V or ⑪...
  • Page 54 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 55 • 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 56 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 57 DSW1 R923 R541 R543 DSW1...
  • Page 58 02'(/ 50FP A  3RZHU &LUFXLW 5($&725 <(/ 7$% 7$% 3:% 0$,1 3:% ,30%2$5' & TERMINAL ',2'( %5,'*( 7$% BOARD / 1250$/ &2,/ 5/ 32:(5 5(/$< ) $ )86( / 1) &2,/ ' :+ 4 5 5 '% '% 5 :+ 4 ,1586+ &855(17 5(/$< ...
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  • Page 60 && & & & & / / 6PRRWKLQJ +,& &DSDFLWRU /' 3:% &RQWURO 5HDFWRU FRQQHFWRU 3:% ,30...
  • Page 61 3. Latch-type reversing valve control circuit ※ Timing for voltage measurement ・This model comes equipped with a latch-type reversing valve. Forcible cooling ・The latch-type reversing valve is so designed switch (test switch) 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 63 5. Electric expansion valve circuit...
  • Page 64 3.15A Fuse Switching power source...
  • Page 65 3.15A 3.15A ( DC260-360V )
  • Page 67 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 68 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 69: Service Call Q&A

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  • Page 72: Trouble Shooting

    7528%/( 6+227,1* 02'(/ RA 50FP A 35(&$87,216 )25 &+(&.,1* 9 +]...
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  • Page 75 7528%/( 6+227,1* :+(1 7+( 7,0(5 /$03 %/,1.6 02'(/ RAF-50RP A :KHQ WKH WLPHU ODPS RQ WKH GLVSOD\ VHFWLRQ RI WKH LQGRRU XQLW EOLQNV UHIHU WR WKH IROORZLQJ WDEOH /DPS EOLQNLQJ PRGH 0DLQ GHIHFWLYH  VHF 2QFH 5HYHUVLQJ YDOYH GHIHFWLYH  VHF  7LPHV )RUFHG RSHUDWLRQ RI RXWGRRU XQLW  VHF...
  • Page 76 LIGHTING MODE OF THE SELF-DIAGNOSIS LAMP MODEL RAC-50F P A DANGER (DC350V) SELF-DIAGNOSIS USED-JW002 OUTDOOR FAN MOTOR TEST/SERVICE SELF-DIAGNOSIS USED-JW001 CONNECTOR(CN24) SWITCH CN17 DC INPUT(-) LED LD303 LED LD302 DC INPUT(+) LED LD301 P.W.B.IPM FUSE F3 P.W.B.MAIN FUSE F4 COMPRESSOR CONNECTOR...
  • Page 79 &+(&.,1* 7+( ,1'225287'225 81,7 (/(&75,&$/ 3$576 $1' 5()5,*(5$7,1* &<&/( MODEL RAF-50RPA/ RAC-50FPA <HV 6HH ´7URXEOHVKRRWLQJ ZKHQ WKH WLPHU ODPS 'RHV WKH WLPHU ODPS RQ WKH LQGRRU XQLW EOLQN" EOLQNVµ &KHFN WKH RXWGRRU HOHFWULFDO SDUWV 7LPHU ODPS 6HW WR URRP WHPSHUDWXUH ℃ LQ WKH FRROLQJ )RXU WLPHV EOLQNLQJ PRGH RU WR ℃...
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  • Page 85 &+(&.,1* 7+( 287'225 81,7 (/(&75,&$/ 3$576 MODEL RAC-50FPA...
  • Page 89  6ZLWFK 2)) PDLQ SRZHU VXSSO\  6KRUW FLUFXLW EHWZHHQ -: DQG -:  6ZLWFK 21 PDLQ SRZHU VXSSO\ ² /' ZLOO EOLQN  WLPH  :LWKLQ  PLQXWHV 3UHVV 7HVW 6ZLWFK IRU  VHFRQG RU PRUH  6HOIGLDJQRVLV UHVXOW ZLOO EH VKRZQ ² /' ZLOO 21 /,7 DQG /' ZLOO EH EOLQNLQJ 7KHQ UHIHU WR GLDJQRVLV WDEOH   6ZLWFK 2)) PDLQ SRZHU VXSSO\ 7KHQ UHOHDVH EDFN -: DQG -: WR RULJLQDO FRQGLWLRQ QR VKRUW FLUFXLW FRQGLWLRQ ...
  • Page 90 &+(&.,1* 7+( 5(027( &21752//(5...
  • Page 92 Please set the DIP switch No.6 to ON accordingly (Refe to page 57).
  • Page 95 CHECKING THE REFRIGERATING CYCLE (JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE) Lighting mode Blinks Blinks Blinks Blinks Blinks Blinks Connect U,V,W phase leads to the 2 times 3 times 4 times 5 times 6 times 8 times Self･ power module again and operate the diagnosis Lamp air conditioner.
  • Page 96 +2: 72 23(5$7( 86,1* 7+( 6(59,&( 6:,7&+ 7+( 287'225 81,7 MODEL RAC-50FPA 7XUQ WKH SRZHU VZLWFK RII DQG WKHQ WXUQ RQ DJDLQ 5HPRYH WKH HOHFWULFDO SDUWV FRYHU /' UHG ZLOO OLJKW DQG WKH XQLW ZLOO RSHUDWH LQ WKH IRUFHG FRROLQJ PRGH DW WKLV WLPH 1HYHU RSHUDWH WKH XQLW 6HUYLFH VZLWFK LQ WKLV VWDWH IRU PRUH...

  • Page 97: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAF -50RPA...
  • Page 98 MODEL RAF-50RPA HWRAF- - 50NX2 A14 #HBOARD-AS...
  • Page 99 OUTDOOR UNIT MODEL: RAC-50 F P A...
  • Page 100 MODEL RAC-50FPA...
  • Page 101 RAF-50RPA / RAC-50FPA HHAW NO. 0070E...

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