Hitachi RAS-08PH1 Service Manual
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Hitachi RAS-08PH1 Service Manual

Outdoor/indoor units
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SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
OUTDOOR UNIT
RAC-08PH1
RAC-10PH1
RAC-14PH1
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

Hitachi Household Appliances(Wuhu) Co.,Ltd.
INDOOR UNIT
RAS-08PH1
RAS-10PH1
RAS-14PH1
INDOOR UNIT
OUTDOOR UNIT
RAS-08PH1
RAC-08PH1
1 PHASE, 50 Hz, 220-230V
(W)
580 (155 ~ 1,010)
(A)
3.10-2.97
(kW)
2.00 (0.90 ~ 2.50)
(B.T.U./h)
6,820 (3,070 ~ 8,530)
(W)
620 (115 ~ 970)
(A)
3.32-3.17
(kW)
2.50 (0.90 ~ 3.20)
(B.T.U./h)
8,530 (3,070 ~
10,92 ) 0
W
780
700 (+68)
H
280
505
D
218
258 (+48)
(kg)
7.5
27
INDOOR UNIT + OUTDOOR UNIT
HHAW
RAS-
08PH
RAS-
10PH
RAS-
14PH
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ----------------------------------------------------------------------- 7
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 19
MAIN PARTS COMPONENT --------------------------------------------------- 20
WIRING DIAGRAM ---------------------------------------------------------------- 22
CIRCUIT DIAGRAM --------------------------------------------------------------- 23
BLOCK DIAGRAM ----------------------------------------------------------------- 26
BASIC MODE ----------------------------------------------------------------------- 27
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 36
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 37
TROUBLE SHOOTING ----------------------------------------------------------- 82
PARTS LIST AND DIAGRAM --------------------------------------------------
DC INVERTER (WALL TYPE)
INDOOR UNIT
OUTDOOR UNIT
RAS-10PH1
RAC-10PH1
1 PHASE, 50 Hz, 220-230V
700 (155 ~ 1,290)
3.75-3.59
2.50 (0.90 ~ 3.10)
8,530 (3,070 ~ 10,580)
880 (115 ~ 1250)
4.71-4.51
3.40 (0.90 ~ 4.40)
11,600 (3,070 ~
15,01 ) 0
780
700 (+68)
280
505
218
258 (+48)
7.5
27
1
NO. 0083E
1
RAC-08
PH1
1
RAC-10
PH1
1
RAC-14
PH1
CONTENTS
--------------------------------------
105
108
INDOOR UNIT
OUTDOOR UNIT
RAS-14PH1
RAC-14PH1
1 PHASE, 50 Hz, 220-230V
1090 (155 ~ 1,460)
5.22-4.99
3.50 (0.90 ~ 4.00)
11,940 (3,070 ~
13,65 ) 0
1,100 (115 ~ 1,440)
5.26-5.03
4.20 (0.90 ~ 5.00)
13,648 (3,070 ~ 17,060)
780
750 (+91)
280
548
218
288 (+47)
7.5
36
After installation

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Summary of Contents for Hitachi RAS-08PH1

  • Page 1: Table Of Contents

    700 (+68) 700 (+68) 750 (+91) DIMENSIONS (mm) 258 (+48) 258 (+48) 288 (+47) NET WEIGHT (kg) After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT Hitachi Household Appliances(Wuhu) Co.,Ltd.
  • Page 2 SAFETY DURING REPAIR WORK 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. 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 Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned). Object parts (1) Micro computer (2) Integrated circuits (IC)
  • Page 4 (6)Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Working table Resistor of 1 M (1/2W) Staple Earth wire Bare copper wire (for body earth) Fig. 3 Grounding of the working table Soldering iron Grounding wire...
  • 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: Specifications

    SPECIFICATIONS RAS-08PH1 RAC-08PH1 RAS-10PH1 MODEL RAC-14 H RAC-10PH1 RAS-14PH1 FAN MOTOR DC35V 25W DC120-380V 40W DC120-380V 4 W FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – ASD084SF-A7JK 5RS102ZBC21 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.0A POWER RELAY...
  • Page 17 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-08PH1, RAS-10PH1, RAS-14PH1 INDOOR UNIT RAS_AW_015-018e...
  • Page 18 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-08PH1, RAC-10PH1 OUTDOOR UNIT...

  • Page 19: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-14 H OUTDOOR UNIT Handle Handle Air outlet Air Suction grill Rear side Holes for anchor bolt (2 – ø12 x 6 slots for ø8.0 bolt) Notch for anchor bolt (for 2 – ø8.0 bolt) Fixing hole Drain hole Drain hole...

  • Page 20: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications RAS-08PH1 , RAS-10PH1, RAS-14PH1 16.7 (62.1) 18.7 (65.7) INDICATION 16.0 (60.8) 19.3 (66.7) TEMPERATURE 24.7 (76.5) 26.7 (80.1) INDICATION C ( F) 24.0 (75.2) 27.3 (81.1) 32.7 (90.9) 34.7 (94.5) INDICATION 32.0 (89.6) 35.3 (95.5)
  • Page 21 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-08PH1,RAC-10PH RAC- ITEM COMPRESSOR TYPE ASD084SF-A7JK 5RS102ZBC21 POWER SOURCE DC 220 - 350 V OUTPUT 710W 700W WHITE WINDING YELLOW 20 C 2M=1.15 RESISTANCE 75 C 2M=1.40 YELLOW WHITE COMPRESSOR FRONT SIDE OF OUTDOOR UNIT 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 28 Table 1 Fan speed by mode Mode data file RAS-08PH1 REQUIRED VALUE LABEL NAME Operation OF UNIT SIDE Fan speed mode Label name mode 3800 min WMAX Ultra Lo FWSS 3800 min WMAX 2 Silent, Sleep FWSOY 3000 min WSTD...
  • Page 29 Table 1 Fan speed by mode Mode data file RAS-10PH1 REQUIRED VALUE LABEL NAME Operation OF UNIT SIDE Fan speed mode Label name mode 4500 min WMAX Ultra Lo FWSS 5500 min WMAX 2 Silent, Sleep FWSOY 4200 min WSTD 3800 min WJKMAX Overload...
  • Page 30 Table 1 Fan speed by mode Mode data file RAS-14PH1 REQUIRED VALUE LABEL NAME Operation OF UNIT SIDE Fan speed mode Label name mode 5500 min WMAX Ultra Lo FWSS 6000 min WMAX 2 Silent, Sleep FWSOY 4600 min WSTD 4200 min WJKMAX Overload...

  • Page 36: Refrigerating Cycle Diagram

    MODEL RAS-08PH1/RAC-08PH1 RAS-10PH1/RAC-10PH1 MODEL RAS-14PH1/RAC-14PH1...

  • Page 37: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-08PH 1, RAS-10PH1, RAS-14PH1 1. Reset Circuit NORMAL : HI RESET : LO Microcomputer R552 IC521 Fig. 1-1 Power "OFF" Power "ON" Voltage 5.0V Voltage supply to pin 2 of IC521 Reset enter at 4.2V Reset release at 4.4V Voltage 5.0V...
  • Page 38 2. Receiver Circuit Fig.2-1 IRR (light receiver unit) receives the infrared signal from the wireless remote controller. The receiver amplifies and shapes the signal and outputs it. 3. Buzzer Circuit Fig.3-1 Buzzer circuit When the buzzer sounds, an approx 3.9kHz square signal is output from buzzer output pin of the microcomputer.
  • Page 39 4. Auto Sweep Motor Circuit Auto sweep motor for horizontal air defectors IC711 Microcomputer Rotor Fig.4-1 Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pin E E E E E ~ H H H H H of microcomputer.
  • Page 40 5. Initial Setting Circuit (IC401) • When power is supplied, the microcomputer reads the data in IC401 or IC402 (E PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values. •...
  • Page 41 7. Fan Motor Drive Circuit CN10 Micro computer DC fan motor output Fan motor R751 C751 DC fan motor Speed feedback R631 C631 Fig. 7-1 Voltage at point A Waveform Voltage at point B Waveform Voltage at point C Waveform Fig.
  • Page 42 MODEL RAC- 08PH1 RAC- 10PH 1. Power circuit This circuit is to convert the power from AC which is provided from the terminal A and B to DC voltage. And produces an AC current which does not exceed the harmonic amplitude limit of the IEC61000-3-2. When the compressor is stopped, the AC voltage becomes about 300 V and while the compressor operates, it is about 280 V.
  • Page 43 (3) C021 and C022 This smoothes the voltage rectified for operating the compressor. When the input voltage is taken for the sine wave as shown in the top of Fig. 1-4, it is rectified by the DB2 and becomes the waveform as shown in the middle of Fig.
  • Page 44 2. Indoor/Outdoor Interface Circuit The interface circuit superimposes an interface signal on the DC 35V line to perform communications between indoor and outdoor units. This circuit consists of a transmitting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a circuit which detects the interface signal on the DC 35V line.
  • Page 45 Fig. 2-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. CONTROL P.W.B . 6.5V C801 Q801 R268 R802 Q204 I/F TRANSMISSION R803 (SDO) C802 I/F RECEPTION (SDI) R263 R254 L802 R257 Q205 D206 NF COIL 2 IC5(1/2)
  • Page 46 Outdoor microcomputer Pin 48 Pin 51 Indoor microcomputer Pin 50 Pin 49 35V DC line 33ms. 100ms. 1 frame Leader Fig. 2-2 Voltages Waveforms of Indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor microcomputer Pin 48 Pin 51 Indoor microcomputer Pin 50 Pin 49 35V DC line 4.95ms.
  • Page 50 Intelligent power module switches power supply current according to position of the compressor motor rotor. The switching order is as shown in Fig. 3-2. At point E: U + is ON, V - is ON (circuit in Fig. 3-1) At point F: U + is chopped (OFF), V - is ON (circuit in Fig. 3-4) Upper arm transistor Time...
  • Page 51 – Fig. 3-4 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. 3-3. 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 54 5. Power Circuit for P.W.B. • Fig. 5-1 shows the power circuit for P.W.B. AC220-230V Fig. 5-1 • In the power circuit for P.W.B., power supply for microcomputer, peripheral circuits, and IPM driver circuit and, as well as DC 35V, are produced by switching power circuit. •...
  • Page 58 6-2. Overload control circuit (OVL control circuit) Overload control is to decrease the speed of the compressor and reduce the load when the load on the air conditioner increases to an overload state, in order to protect the compressor, electronic components and power breaker.
  • Page 60 R003,R004,R608,R613, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage and applies correction to the overload set value so the DC current will be low when the DC voltage is high. (Since the load level is indicated by the DC voltage multiplied by DC current, R247, R248, R249 are provided to perform the same overload judgement even when the voltage varies.) DC voltage : Low DC current : High...
  • Page 61 6-3. Reset Circuit D208 R287 Microcomputer RESET OUT. R252 RESET C204 IC5(1/2) R288 0V 0V 0V 0V Fig. 6-10 The reset circuit initializes the microcomputer program when Power is “ON” from “OFF” . Low voltage at pin 7 resets the microcomputer, and HI activates the microcomputer. Fig.
  • Page 62 6-4. Temperature Detection Circuit Main P.W.B. O.H. thermistor R304 C304 R301 DEF. thermistor Microcomputer AX-8V11 R305 C303 R302 Outdoor temperature thermistor CN10 R306 Outdoor temperature C302 R303 Fig. 6-12 The Over heat thermistor circuit detects the temperature at the surface of the compressor head, the Defrost. thermistor circuit detects the defrosting operation temperature.
  • Page 63 6-5. Reversing valve control circuit In this unit, reversing valve control circuit turns ON/OFF the power to the reversing valve coil by opening/closing the reversing valve relay. Opening/closing of relay will differ depending on the operation condition. (In the cooling cycle, reversing valve relay is normally ON (close).) Table 6-3 shows the circuit operation of each operation mode.
  • Page 64 6-6. Electric expansion valve control circuit Electric expansion valve is driven by B-12V. Opening of the valve is controlled by feeding power to 1 or 2 phases of the 4-phase coil to switch the polarity of the coil. The relation between the conducting phase switching direction and open/close direction is as shown below.
  • Page 65 6-7. Outdoor DC Fan Motor control circuit This model uses DC Fan Motor which has a controller circuit built in the Motor. This DC Fan Motor will rotate by control voltage apply to Vsp input. (V (Voltage range: 1.7 to 7V DC) Vsp high : Faster ;...
  • Page 66 < Reference > When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor. In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those connectors are in misconnection. DC Fan Motor has broken invites 1A Fuse burned.
  • Page 67 MODEL RAC-1 4 PH1 1. Power circuit This circuit rectifies the 230 V AC voltage applied between terminals L and N of the terminal board to produce a DC voltage. However, the DC voltage rises to approximately 280 to 350 V at the time of compressor operation. −...
  • Page 68 Main parts DB601 DB1 This operates to rectify the DC voltage applied between terminals L and N of the terminal board to a DC voltage. C021 and C022 This smoothes the voltage rectified for operating the compressor. When the input voltage is taken for the sine wave as shown in the top of Fig.
  • Page 69 2. Power circuit for P.W.B. • The v oltage specification of the power circuit is as follows. <Check points> Output Voltage Main load Measuring points Potential failure modes spec. – 11-13V MAIN P.W.B. R117 (“12V” display) R117 (“0V” display) The unit won’t operate MAIN P.W.B.
  • Page 70 3. Indoor/Outdoor Interface Circuit The interface circuit superimposes an interface signal on the DC 35V line to perform communications between indoor and outdoor units. This circuit consists of a transmitting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a circuit which detects the interface signal on the DC 35V line.
  • Page 71 Fig. 3-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. Control P.W.B. R335 C332 L301 Q334 R332 R333 Q333 CJ301 Q332 IF Transmission Q331 L101 Terminal board Microcomputer R326 R330 IC301 C321 (2/2) R327 R650...
  • Page 72 0.7V Outdoor microcomputer Indoor microcomputer 35V DC line Fig. 3-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor microcomputer Indoor microcomputer 35V DC line Fig. 3-3 Voltages Waveforms of indoor / Outdoor Microcomputers (Indoor to Outdoor Communications)
  • Page 73 4. Reset Circuit HYBRID IC BOARD MAIN P.W.B. − Fig. 4-1 The reset circuit initializ es the microcomputer program when Power is “ON” from “OFF” Low voltage at pin resets the microcomputer, and HI activates the microcomputer Fig. 4-1 shows the reset circuit and Fig. 4-2 shows waveform at each point when power is turned on and off.
  • Page 74 5. Temperature Detection Circuit MAIN P.W.B. Hybrid IC BOARD O.H. thermistor R203 O.H. C202 Microcomputer R301 DEF. thermistor R239 65 DEF. C216 R302 Outdoor temperature thermistor CN10 R240 Outdoor temperature C217 R303 Fig. 5-1 The Over heat thermistor circuit detects the temperature at the surface of the compressor head, the Defrost. thermistor circuit detects the defrosting operation temperature.
  • Page 75 6. Reversing valve control circuit REVERSING VALVE REVERSING VALVE Fig. 6-1 Reversing valve control circuit will switch reversing valve ON/OFF according to instruction from indoor microcomputer depending on the operation condition shows in Table 6-1. Voltage at D401 (between anode and cathode) in each operation condition is approximately as shown in Table 6-1 when measured by multimeter.
  • Page 76 7. Electric expansion valve control circuit VALVE4 VALVE VALVE VALVE VALVE Fig. 7-1 • To drive the expansion valve, use the B-12 V output. Use a 4-phase coil and feed power to the phases 1 and 2, then switch over the filed poles to control the opening of the valve. •...
  • Page 77 8. Outdoor DC Fan Motor control circuit FAN MOTOR DRIVE CIRCUIT MICROCOMPUTER DIRECT CURRENT Id Fig. 8-1 The external fan motor is controlled by the outdoor microcomputer. This outdoor fan motor estimates the actual speed, based on the DC current flowing to R741; it then adjusts this value as necessary, so that it becomes the speed corresponding to the operation command transmitted from the indoor unit.
  • Page 78 < Reference > When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor. In this case, please check CN24 connection first. It makes Fan Motor Lock a lso if those connectors are in misconnection. DC Fan Motor has broken invites 2A Fuse burned.

  • Page 79: Service Call Q & A

    SERVICE CALL Q & A Model RAS-08PH1 / RAC-08PH1 RAS- 10PH1 / RAC- RAS-14PH1 / RAC-14 H &22/,1* 02'( 7KH FRPSUHVVRU KDV VWRSSHG &KHFN LI LQGRRU KHDW ,I WKH DLU FRQGLWLRQHU RSHUDWHV LQ VXGGHQO\ GXULQJ FRROLQJ H[FKDQJHU LV IURVWHG FRROLQJ PRGH ZKHQ LW LV FROG...
  • Page 80 $872 )5(6+ '()5267,1* $IWHU WKH 212)) EXWWRQ LV SUHVVHG WR $XWR )UHVK 'HIURVWLQJ LV FDUULHG RXW  WKH V\VWHP VWRS KHDWLQJ WKH RXWGRRU XQLW LV VWLOO FKHFNV WKH RXWGRRU KHDW H[FKDQJHU DQG GHIURVWV LW ZRUNLQJ ZLWK WKH 23(5$7,21 ODPS DV QHFHVVDU\ EHIRUH VWRSSLQJ RSHUDWLRQ OLJKWLQJ $872 23(5$7,21 )DQ VSHHG GRHV QRW FKDQJH ZKHQ IDQ...
  • Page 81 $7 67$57,1* 23(5$7,21 7KLV LV EHFDXVH WKH SUHKHDWLQJ GHYLFH LV ZRUNLQJ :KHQ WKH KHDWLQJ RSHUDWLRQ LV VWDUWHG ,W ZLOO QRW VWDUW WR GULYH WKH IDQ XQWLO WKH UHIULJHUDWLQJ WKH LQGRRU IDQ GRHV QRW VWDUW F\FOH ZDUPV XS DQG ZDUP DLU EORZV :DLW IRU D ZKLOH LPPHGLDWHO\ 6XFK D SKHQRPHQRQ PD\ RFFXU ZLWK EXLOWLQ :KHQ WKH XQLW EXLOW EHKLQG WKH JDOOHU\...

  • Page 82: Trouble Shooting

    TROUBLE SHOOTING RAC-08PH1,RAC-10PH1, RAC-14PH1 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 83 DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT WARNING Caution Voltage of about 350 V is charged between the terminal of smoothing capacitors (375μF x 2). During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing capacitors.
  • Page 84 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS-08 H ,RAS-10 H , RAS-14 H 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.
  • Page 85 Other Cautions (1) Cautions concerning ICP (IC Protector) 1. Use due caution for short circuit in servicing. Short circuit will open the ICP immediately. 2. When the ICP opens, remove the cause of this phenomenon and replace the ICP. If the remedy is improper, the ICP may open again. 35V line ICP2 Indoor unit fan motor...
  • Page 86 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 87 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model: RAS- ,RAS-10PH1,RAS-14PH1 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Interface voltage error Lights for 0.35 sec. at interval of 0.35 sec.) <Cautions> If the interface circuit is faulty when power is supplied, the self-diagnosis display will not be displayed.
  • Page 88 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-08 P H1, RAC- P H1 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-E10H2 RAS_AW_063-082e...
  • Page 89 SELF-DIAGNOSIS LIGHTING MODE...
  • Page 90 OUTDOOR UNIT Remove the compressor connector. Model: RAC-08PH1, RAC-10 LD303 LD302 C. I. PRINCIPAL LD301 COMMUTATEUR DE MAINTENANCE Model: RAC-14 LD301 LD302 LD303 COMORESSOR CONNECTOR(CN1) TEST SWITCH SELF-CHECK CONNECTOR(CN30) • Check the drive If your first attempt With the unit set in the operating circuit (IMP) using fails, wait 3 minutes state, press the start/stop...
  • Page 91 CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING Trouble shoot according to the Is the indoor unit "timer lamp" blinking? self-diagnosis lighting mode. Open the indoor unit and check the voltage between pins Nos.1 and 3 of CN3 on the indoor unit control P.W.B.
  • Page 92 CHECKING THE INDOOR UNIT ELECTRICAL PARTS 1. Power does not come on (no operation) Is AC220-230V being generated Is DC35V or 20V being generated between terminals L and N on the between terminals C and D on the outdoor unit terminal board? indoor unit terminal board? Check the indoor/outdoor unit connection cable, and correct any...
  • Page 93 2. Indoor fan does not operate (others are normal) Can the fan be stopped by remote The microcomputer fan PWM Replace the microcomputer. control? output (at pin ) is 1-5V. Replace the fan motor. Replace the microcomputer. Perform final operation check. 3.
  • Page 94 4. Check the control P.W.B. (power circuit) Is 35V or 20V being output Check to see if the connection cables are at pin 5 relative to 0V at disconnected or reversed. pin 3 of CN3? If normal, check the outdoor unit P.W.B. Is 12V or 7V being output Is ICP1 normal? at (+) relative to 0V at (-) of...
  • Page 103 (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 104: How To Operate The Outdoor Unit Independently

    HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC-08 PH1, RAC- PH1,RAC-14PH1 1. Turn off the power switch. 2. Remove the electrical box cover. 3. Turn on the power switch. 4. After waiting for 30 seconds, push the service switch for a second. LD303 (red) will light and the unit will operate in the forced cooling mode at this time.

  • Page 105: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAS-08PH1,RAS-10PH1, RAS-14PH1 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.
  • Page 106 4. Tangential air flow fan and fan motor (1) Remove two screws locking the drain pan. (5) Remove the electrical box fixing screws and GND wire fixing (2) Press to lower the hook at the center of theunit a little and pull the screw.
  • Page 107 OUTDOOR UNIT RAC-14P H1 1. Electrical parts (1)Remove the service value cover lock screws (6)Remove each connector and earth cable from and lower the cover to remove it. the lead wire. (2)Remove the top cover lock screw and raise the ( Remove four lock screws from the main P.W.B.
  • Page 108 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAS-08PH1,RAS-10PH1,RAS-14PH1...
  • Page 109 INDOOR UNIT...
  • Page 110 OUTDOOR UNIT MODEL: RAC-08 H ,RAC-10 H RAS_AW_083-093e...
  • Page 111 OUTDOOR UNIT HHAW PARTS NO Q'TY/UNIT PARTS NAME HWRAC-E10H2 BASE HWRAC-10EH4 COMPRESSOR HWRAC-25YH4 COMPRESSOR RUBBER HWRAC-25YH4 PUSH NUT HWRAC-10EH4 CONDENSER HWRAC-10EH4 REVERSING VALVE(WITH COIL) HWRAC-SX10HAK A07 2S-VALVE HWRAC-SX10HAK A08 3S-VALVE HWRAC-10EH4 SOUND PROOF COVER ASS'Y HWRAC-E10H2 O.L.R COVER HWRAC-10EH4 SOUND PROOF COVER ASS'Y HWRAC-E10H2 CONNECTING CORD(COMP) HWRAC-E10H2...
  • Page 112 OUTDOOR UNIT MODEL: RAC-14 P H1...
  • Page 113 OUTDOOR UNIT Q'TY HHAW PARTS NO PARTS NAME /UNI HWRAC-14EH4 BASE HWRAC-14EH4 COMPRESSOR HWRAC-25YH4 PUSH NUT HWRAC-E14H3 ELECTRIC EXPAN. VALVE HWRAC-E14H3 CONDENSER HWRAC-14EH4 REVERSING VALVE(WITH COIL) HWRAC-SX10HAK 2S-VALVE HWRAC-SX10HAK 3S-VALVE HWRAC-14EH4 SOUND PROOF COVER ASS'Y HWRAC-14EH4 O.L.R COVER HWRAC-SX10HAK SOUND PROOF COVER ASS'Y HWRAC-14EH4 CONNECTING CORD(COMP) HWRAC-D10EX...
  • Page 114 HITACHI RAS-08PH1/RAC-08PH1 HHAW NO. 00 E RAS-10PH1/RAC-10PH1 RAS-14PH1/RAC-14PH1...

This manual is also suitable for:

Ras-10ph1Ras-14ph1Rac-14ph1Rac-08ph1Rac-10ph1

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