Hitachi RAS-35FH6 Service Manual
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Hitachi RAS-35FH6 Service Manual

Dc inverter (wall type) type
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SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
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

FEBRUARY 2008 Hitachi Household Appliances(Wuhu) Co.,Ltd.
RAS-35FH6
RAC-35YH6
RAS-35FH6
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
AW
RAS-35FH6/RAC-35YH6
REFER TO THE FOUNDATION MANUAL

SPECIFICATIONS ------------------------------------------------------------------- 4

How To Use ----------------------------------------------------------------------- 5
Construction And Dimensional Diagram --------------------- 15
Main Parts Component --------------------------------------------------- 17
Wiring Diagram ---------------------------------------------------------------- 19
Circuit Diagram --------------------------------------------------------------- 20
Block Diagram ----------------------------------------------------------------- 22
Basic Mode ----------------------------------------------------------------------- 23
Refrigerating Cycle Diagram --------------------------------------- 29
Description Of Main Circuit Operation ----------------------- 30
SERVICE CALL Q & A ---------------------------------------------------------- 58
Trouble Shooting ----------------------------------------------------------- 61
Parts List And Diagram -------------------------------------------------- 90
DC INVERTER (WALL TYPE)
1 PHASE, 50 Hz, 220-230V
1,090 (155 ~ 1,460)
5.22-4.99
3.50 (0.90 ~ 4.00)
11,940 (3,070 ~ 13,650)
1,110 (115 ~ 1,440)
5.32-5.09
4.20 (0.90 ~ 5.00)
14,330 (3,070 ~ 17,060)
780
280
220
9.5
NO. 0025E
CONTENTS
RAC-35YH6
750 (+91)
548
288 (+47)
35
After installation
88

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Summary of Contents for Hitachi RAS-35FH6

  • Page 1: Service Manual

    CAPACITY (B.T.U./h) 14,330 (3,070 ~ 17,060) 750 (+91) DIMENSIONS (mm) 288 (+47) NET WEIGHT (kg) After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT FEBRUARY 2008 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 RAC-35YH6 RAS-35FH6 MODEL FAN MOTOR 40 W PWM DC35V FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR — ASC092CD-A8JK COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR...
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  • Page 17: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-35FH6 INDOOR UNIT – 15 –...

  • Page 18: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-35YH6 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) Drain hole Fixing hole Drain hole Service space...

  • Page 19: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS-35FH6 THERMOSTAT MODEL OPERATION MODE COOL HEAT 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)
  • Page 20 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-35YH6 ITEM COMPRESSOR TYPE ASC092CD-A8JK POWER SOURCE DC 220 ~ 350 V OUTPUT 750W WHITE WINDING YELLOW 20°C 2M=1.15 RESISTANCE (Ω) 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 21 WIRING DIAGRAM CAUTION COMPRESSOR BLU : BLUE ORN : ORANGE The marked parts BLK : BLACK RED : RED very important ones for safety. BRN : BROWN WHT : WHITE GRN : GREEN YEL : YELLOW GRY : GRAY WHT YEL RED O U T D O O R F A N M O T O R 1 A FUSE...

  • Page 22: Circuit Diagram

    CIRCUIT DIAGRAM RAS-35FH6 – 20 –...
  • Page 23 RAC-35YH6 MODEL P Q 1 P Q 2 P Q 4 0 1 P Q 4 0 2 P Q 4 0 3 P Q 4 0 4 P Q 7 0 1 SELF-CHECK SELF-MODE SERVICE SW AX-8T11 – 21 –...

  • Page 24: Block Diagram

    BLOCK DIAGRAM MODEL RAS-35FH6 / RAC-35YH6 INDOOR UNIT OUTDOOR UNIT Outdoor DC fan motor Power source 1ø 50Hz 220-230V HARMONICS POWER POWER RELAY IMPROVEMENT SWITCH RECTIFIER CIRCUIT Inrush current DC compressor Protection circuit motor Rotor magnetic pole position detection circuit...
  • Page 25 RAS-35FH6 – 23 –...
  • Page 26 Table 1 Mode data file RAS-35FH6 LABEL NAME VALUE 5200 min WMAX 5200 min WMAX2 5050 min WSTD WJKMAX 4200 min 3800 min WBEMAX 3800 min WSZMAX CMAX 4800 min 4300 min CSTD 4200 min CKYMAX 3400 min CJKMAX 2700 min...
  • Page 27 Table 1 Thermo judgment Item Temperature Thermo judgment (ON) 30°C CLMXTP Room temperature Thermo judgment (OFF) 32°C Room temperature Thermo judgment (ON) 32°C Outdoor temperature Thermo judgment (OFF) 33°C Temperature set for cooling and dehumidifying (value set by remote control [+]) Table 2 Compressor speed 20min.
  • Page 28 Cooling Sleep Operation Dehumidifying Operation 7 hr Room temperature 1 hr Set to 7 hours Sleep button Operation lamp Timer lamp Remote control (Sleep) ON See basic operation Indoor fan Start Stop button Silent Sleep Lo Outdoor fan Horizontal air Shut deflector Horizontal...
  • Page 29 Table 3 Compressor speed Basic Heating Operation Calculated Temperature compressor speed difference (with shift value) 35FH6 2500 min –1 1.66°C 2900 min –1 2.00°C Heating set temperature 3300 min –1 2.33°C (remote control set temperature (+)) –1 3700 min 2.66°C 4100 min –1 3.00°C...
  • Page 30 Heating Sleep Operation Reversing Valve Defrosting Preheating released Silent Sleep button Reversing valve (cooling "on" model) 2min. 30sec. Silent Sleep Lo Notes: (1) The defrosting inhibit period is set as shown in the diagram below. When defrosting has finished once, the inhibit period is newly set, based on the outdoor temperature when the compressor was started.
  • Page 31 RAS-35FH6 / RAC-35YH6 Silencer Reversing Service valve Single-ended union valve Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer Silencer Reversing valve Service valve Single-ended union Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer –...

  • Page 32: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-35FH6 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 33 2. Receiver Circuit Q141 R212 L201 R141 ZD141 C212 C211 RECEIVER I/P R211 R611 C611 Microcomputer 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.
  • Page 34 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~H of microcomputer. Step width : 10ms Micro computer pins Horizontal air deflectors Fig.4-2 Microcomputer Output Signals...
  • Page 35 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 36 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 T1 = Low speed T2 = High speed Voltage at point B Waveform Voltage at point C Waveform...
  • Page 37 MODEL RAC-35YH6 1. The electrical parts for the outdoor unit is composed of two P.W.B. (a power P.W.B. and main P.W.B.) and a harmonics improvement circuit as shown in Fig. 1-1. • Main P.W.B. This P.W.B. is equipped with the rectification diode, DC fan motor control circuit and the circuits around the micro computer which take various controls.
  • Page 38 2. 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 39 (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. 2-4, it is rectified by the DB2 and becomes the waveform as shown in the middle of Fig.
  • Page 40 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 41 Fig. 3-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. Control P.W.B. Fig. 3-1 – 39 –...
  • Page 42 Outdoor microcomputer Pin 11 Pin 68 Indoor microcomputer Pin 50 Pin 49 35V DC line 33ms. 100ms. 1 frame Leader Fig. 3-2 Voltages Waveforms of Indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor microcomputer Pin 11 Pin 68 Indoor microcomputer Pin 50 Pin 49 35V DC line 4.95ms.
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  • Page 44 Compressor minimum rotation speed(4 MSB) Compressor minimum rotation speed(3) Compressor minimum rotation speed(2) Compressor minimum rotation speed(1) Compressor minimum rotation speed(0 LSB) OVL up Fan-7-step request 15/20(A) Actual compressor rotation speed(5 MSB) Compressor command speed(7 MSB) Actual compressor rotation speed(4) Compressor command speed(6) Actual compressor rotation speed(3) Compressor command speed(5)
  • Page 45 4. IPM (Intelligent Power Module) • Fig.4-1 shows the intelligent power module and its peripheral circuit. The three transistors on the positive E side are called the upper arm, and the three transistors on the negative D side, the lower arm. is ON, V - is ON) Fig.
  • Page 46 Intelligent power module switches power supply current according to position of the compressor motor rotor. The switching order is as shown in Fig. 4-2. At point E: U + is ON, V - is ON (circuit in Fig. 4-1) At point F: U + is chopped (OFF), V - is ON (circuit in Fig. 4-4) Upper arm transistor Time...
  • Page 47 – Fig. 4-4 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. 4-3. 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 48 • IPM drive circuit The inverter driving device (IGBT) and the drive circuit are built in the IPM. The IPM receives the signal from the microcomputer and convert it to 0 – 15 V signal to drive the IGBT. When the unit operates at low speed, a chopper signal is emitted from the micro computer as shown in Fig.
  • Page 49 5. Power Circuit for P.W.B. • Fig. 5-1 shows the power circuit for P.W.B. A C 2 2 0 - 2 3 0 V • 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 50 • The voltage 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. (CN3, CN4) R701 (“12V” display) R006 (“0V” display) The unit won’t operate C21 (“12V” display) J27, J30 MAIN P.W.B.
  • Page 51 6. Microcpomputer's Peripheral Circuits 6-1. 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 52 Detection DC Current Resistor Direct Current R003 R004 Q501 R513 Power P.W.B. R514 R906 R613 Microcomputer R612 R248 R245 R222 CN4B CN4A C009 R005 D001 R287 D208 Reset output Reset R288 R252 0V 0V 0V Main P.W.B. Fig. 6-2 (1) IS OVL Current transformer CT1 reads the input flowing current and detected to the microcomputer as a voltage signal.
  • Page 53 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 54 6-2. Reset Circuit MAIN P.W.B. D208 R287 Microcomputer RESET OUT. R252 RESET C204 IC5(1/2) R288 0V 0V 0V 0V Fig. 6-7 The reset circuit initializes the microcomputer program when Power is “ON” from “OFF”. Low voltage at pin h resets the microcomputer, and HI activates the microcomputer Fig.
  • Page 55 7. Temperature Detection Circuit MAIN P.W.B. O.H. thermistor R304 C304 R301 DEF. thermistor Microcomputer R305 C303 R302 Outdoor temperature thermistor CN10 R306 Outdoor temperature C302 R303 Fig. 7-1 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 56 8. Reversing valve control circuit C-35V Power P.W.B. MAIN P.W.B. Reversing valve R701 D701 PQ701 Microcomputer CN4A CN4B Q701 R705 R706 DC voltmeter or multimeter D-0V Fig. 8-1 Reversing valve control circuit will switch reversing valve ON/OFF (cooling ON) according to instruction from indoor microcomputer depending on the operation condition shows in Table 8-1.
  • Page 57 9. Electric expansion valve control circuit POWER P.W.B. MAIN P.W.B. B-12V B-12V CN15 B-12V R403 R404 R401 Microcomputer PQ401 R293 Valve4 PQ402 R294 Valve3 Electric PQ403 R295 Valve2 expansion valve PQ404 R296 Valve1 CN4B CN4A 12 13 C401 B-0V Fig. 9-1 •...
  • Page 58 10. 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. (Voltage range: 1.7 to 7V DC. Vsp high : Faster ;...
  • Page 59 < 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 60: Cooling Mode

    SERVICE CALL Q & A Model RAS-35FH6 / RAC-35YH6 COOLING MODE The compressor has Check if the indoor heat If the air conditioner operates stopped suddenly during exchanger is frosted. in cooling mode when it is cooling operation. Wait for 3-4 minutes cold, the evaporator may get until it is defrosted.

  • Page 61: Auto Operation

    AUTO FRESH DEFROSTING After the ON/OFF button is pressed Auto Fresh Defrosting is carried out : the system checks the outdoor heat exchanger to stop heating, the outdoor unit is and defrosts it as necessary before stopping still working with the OPERATION operation.
  • Page 62 When the “Sleep” timer is set during (1) The temperature arrives at the preset indoor operation, temperature and the air conditioner unit is (1) The indoor fan won’t rotate. temporarily stopped. Within about 3 minutes, (No air comes from the unit) the fan starts rotation.

  • Page 63: Trouble Shooting

    TROUBLE SHOOTING RAC-35YH6 PRECAUTIONS FOR CHECKING Power inlet 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 64 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 (400µF x 2). • During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing capacitors.
  • Page 65 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS-35FH6 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 66 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 67 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 68 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model RAS-35FH6 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAS-35FH6 Blinking of Timer lamp Reason for indication Possible cause Reversing valve defective...
  • Page 69 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-35YH6 INTELLIGENT POWER MODULE LD301 SELF DIAGNOSIS LAMPS LD302 SERVICE SWITCH LD303 – 67 –...

  • Page 70: Outdoor Unit

    OUTDOOR UNIT Remove the compressor connector. 1/ 2/ IPM (Intelligent Power Module) 3/ Service Switch 4/ 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 start/stop the PRD checker.
  • Page 71 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 Run the unit using the following remote controller settings: between pins Nos.
  • Page 72 CHECKING THE INDOOR UNIT ELECTRICAL PARTS 1. Power does not come on (no operation) Is AC220-230V being generated Is AC220-230V being generated at Check AC outlet and breaker, and between terminals A and B on the AC outlet? repair any defective part. indoor unit terminal board? Check the power cable, power switch, and terminal board, and...
  • Page 73 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 N) is 1 - 5V. Replace the fan motor. Replace the microcomputer. Perform final operation check. 3.
  • Page 74 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 75: Checking The Remote Controller

    CHECKING THE REMOTE CONTROLLER Is battery polarity correct? Install the battery in the correct polarity. Is the battery check sign + - Replace the battery. flashing? Turn on an AM radio, bring the remote control switch within 15 cm of the radio, and press the ON/OFF button.
  • Page 76 WARNING PRECAUTIONS FOR SERVICING Be sure that the power switch is turned off or the power cable is disconnected before servicing. Removing the P.W.B.s. System Configuration of Outdoor Unit Electrical Parts The outdoor unit electrical parts consist of two P.W.B. as shown in the figure. <Main P.W.B.
  • Page 77 [C. Power Factor Improvement capacitor] Designed to improve power factor. To replace the capacitor, remove the power P.W.B. and then: 1. Remove two screws fastening the capacitor seat. 2. Slide the capacitor seat in the direction of the arrow. Sliding Direction –...
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  • Page 85 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 86: Checking The Refrigerating Cycle

    (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 87: How To Operate The Outdoor Unit Independently

    HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC-35YH6 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 88 IPM (Intelligent Power Module) DIAGNOSIS Circuit diagram of Collector the device RASF Emitter Circuit diagram of the module Terminals symbol mark of the module * See next page for measuring value using multimeter – 86 –...
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  • Page 90: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAS-35FH6 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. supports from the control P.W.B.
  • Page 91 4. Tangential air flow fan and fan motor OUTDOOR UNIT RAC-35YH6 (1)Remove two screws locking the drain pan. 1. Electrical parts (2)Press to lower the hook at the center of the (1)Remove the service value cover lock screws unit a little and pull the claw forward to remove and lower the cover to remove it.

  • Page 92: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAS-35FH6 – 90 –...

  • Page 93: Indoor Unit

    INDOOR UNIT PARTS NO. Q'TY PARTS NAME RAS-35FH6 HWRAS-25YH5 CABINET HWRAS-25YH5 VERTICAL DEFLECTOR-L HWRAS-25YH5 VERTICAL DEFLECTOR-R HWRAS-25YH5 FAN MOTOR 25W 1.1kg HWRAS-25YH4 TANGENTIAL FAN HWRAS-25YH4 FAN SUPPORT ASSEMBLY HWRAS-25YH4 FAN COVER HWRAS-25YH4 FAN MOTOR SUPPORT HWRAS-25YH5 EVAPORATOR ASSEMBLY HWRAS-25YH4 UNION(2)
  • Page 94 OUTDOOR UNIT MODEL: RAC-35YH6 – 92 –...
  • Page 95 OUTDOOR UNIT PARTS No. RAC-35YH6 Q'TY PARTS NAME HWRAC-E14H2 A01 BASE HWRAC-E08H A02 COMPRESSOR 750W 8.0kg HWRAC-25YH4 A03 COMPRESSOR RUBBER HWRAC-25YH4 A04 PUSH NUT HWRAC-D10EX2 A02 CONDENSER HWRAC-E08H REVERSING VALVE HWRAC-E08H SERVICE VALVE ASS'Y HWRAC-E08H ELECTRIC EXPAN. VALVE HWRAC-E08H SOUND PROOF COVER ASS'Y HWRAC-25YH4 A10 O.L.R COVER HWRAC-25YH4 A11...
  • Page 96 HITACHI AW NO. 0025E RAS-35FH6/RAC-35YH6...

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Rac-35yh6

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