Hitachi RAS-18FH6 Service Manual
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Hitachi RAS-18FH6 Service Manual

Room air conditioner
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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-18FH6
RAS-25FH6
RAC-18YH6
RAC-25YH6
RAS-18FH6
1 PHASE, 50 Hz, 220-230V
(W)
550 (155 ~ 1,010)
(A)
2.95-2.81
(kW)
2.00 (0.90 ~ 2.50)
(B.T.U./h)
6,820 (3,070 ~ 8,530)
(W)
580 (115 ~ 970)
(A)
2.93-2.81
(kW)
2.50 (0.90 ~ 3.20)
(B.T.U./h)
8,530 (3,070 ~ 10,920)
W
780
H
280
D
220
(kg)
9.5
INDOOR UNIT + OUTDOOR UNIT
NO. 0024E
AW
RAS-18FH6 RAC-18YH6
RAS-25FH6 RAC-25YH6
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 --------------------------------------
Description Of Main Circuit Operation ----------------------- 30
SERVICE CALL Q & A ---------------------------------------------------------- 60
Trouble Shooting ----------------------------------------------------------- 63
Parts List And Diagram -------------------------------------------------- 90
DC INVERTER (WALL TYPE)
INDOOR UNIT
RAC-18YH6
RAS-25FH6
1 PHASE, 50 Hz, 220-230V
8,530 (3,070 ~ 10,580)
11,600 (3,070 ~ 15,010)
700 (+68)
780
505
280
258 (+48)
220
27
9.5
CONTENTS
--------------------------------------
OUTDOOR UNIT
RAC-25YH6
700 (155 ~ 1,290)
3.75-3.59
2.50 (0.90 ~ 3.10)
880 (115 ~ 1,250)
4.45-4.26
3.40 (0.90 ~ 4.40)
700 (+68)
505
258 (+48)
27
After installation
- 29
88

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Summary of Contents for Hitachi RAS-18FH6

  • Page 1: Service Manual

    11,600 (3,070 ~ 15,010) 700 (+68) 700 (+68) DIMENSIONS (mm) 258 (+48) 258 (+48) 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 RAS-18FH6 RAC-18YH6 MODEL RAC-25YH6 RAS-25FH6 FAN MOTOR 40 W PWM DC35V FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – ASC092CD COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH...
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  • Page 17: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-18FH6, RAS-25FH6 INDOOR UNIT – 15 –...
  • Page 18 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-18YH6, RAC-25YH6 OUTDOOR UNIT – 16 –...

  • Page 19: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS-18FH6, RAS-25FH6 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-18YH6, RAC-25YH6 ITEM COMPRESSOR TYPE ASC092CD POWER SOURCE DC 220 - 350 V OUTPUT 800W 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 COMPRESSOR WIRING DIAGRAM CAUTION BLU : BLUE ORN : ORANGE RAS-18FH6 / RAC-18YH6 BLK : BLACK RED : RED The marked parts RAS-25FH6 / RAC-25YH6 BRN : BROWN WHT : WHITE very important ones for safety. GRN : GREEN YEL : YELLOW...
  • Page 22 CIRCUIT DIAGRAM MODEL RAS-18FH6, RAS-25FH6 – 20 –...
  • Page 23 MODEL RAC-18YH6, RAC-25YH6 – 21 –...
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  • Page 25 Silent – 23 –...
  • Page 26 Table 1 Mode data file RAS-18FH6 RAS-25FH6 LABEL NAME VALUE 3500 min 4400 min WMAX 3500 min 4400 min WMAX2 2950 min 4200 min WSTD 2800 min 3500 min WJKMAX 2800 min 3200 min WBEMAX 2800 min 3200 min WSZMAX...
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  • Page 29 Table 3 Compressor speed Basic Heating Operation Calculated Temperature compressor speed difference (with shift value) 18FH6 25FH6 2200 min –1 2200 min –1 1.66°C 2600 min –1 2600 min –1 2.00°C Heating set temperature (remote control set temperature 3000 min –1 3000 min –1...
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  • Page 32: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-18FH6, RAS-25FH6 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 E E E E ~ H H H H H of microcomputer.
  • 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 Voltage at point B Waveform Voltage at point C Waveform Fig.
  • Page 37 MODEL RAC-18YH6 RAC-25YH6 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 38 (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 39 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 40 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 41 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.
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  • Page 45 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 46 – 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.
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  • Page 49 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. •...
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  • Page 53 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.
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  • Page 55 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 56 6-3. Reset Circuit R287 D208 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 57 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 58 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 59 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 60 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 61 < 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 62 SERVICE CALL Q & A Model RAS-18FH6 / RAC-18YH6 RAS-25FH6 / RAC-25YH6 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.

  • Page 63: 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 64 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 65: Trouble Shooting

    TROUBLE SHOOTING RAC-18YH6, 25YH6 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 66 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 67 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS-18FH6, 25FH6 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 68 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 69 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 70 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model RAS-18FH6, RAS-25FH6 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAS-18FH6, RAS-25FH6 Blinking of Timer lamp Reason for indication Possible cause Reversing valve defective...
  • Page 71 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-18YH6, RAC-25YH6 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-E10H2 – 69 –...

  • Page 72: Outdoor Unit

    OUTDOOR UNIT Remove the compressor connector. 1/ 2/ IPM (Intelligent Power Module) 3/ Service Switch LD303 4/ Self-Diagnosis Lamp MAIN P.W.B. LD302 LD301 SERVICE SWITCH 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 73 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 74 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 75 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 76 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...
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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-18YH6, RAC-25YH6 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 Model PS21564-C Collector Circuit of 1 device Gate Emitter Internal circuit diagram of module Terminal symbols of power module See next page for measuring value using multimeter – 86 –...
  • Page 89 Diagnosis procedure for power module using multimeter [Inverter section] Set the multimeter to resistance range of 100. If 100 is not provided, measure with the range of 1 to 100. If the pointer does not swing when the following continuity check is performed, it is normal. (When a digital multimeter is used, + and - terminals will be reversed, since the orientation of built-in battery is inverted.) Note:...

  • Page 90: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAS-18FH6, RAS-25FH6 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 91 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 92: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAS-18FH6, RAS-25FH6 – 90 –...

  • Page 93: Indoor Unit

    INDOOR UNIT PARTS NO. Q'TY PARTS NAME RAS-18FH6 RAS-25FH6 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...
  • Page 94 OUTDOOR UNIT MODEL: RAC-18YH6, RAC-25YH6 – 92 –...
  • Page 95 OUTDOOR UNIT PARTS No. RAC-18YH6 RAC-25YH6 Q'TY PARTS NAME HWRAC-E10H2 BASE HWRAC-E10H2 COMPRESSOR 800W 8.0kg HWRAC-25YH4 COMPRESSOR RUBBER HWRAC-25YH4 PUSH NUT HWRAC-E10H2 CONDENSER HWRAC-E10H2 REVERSING VALVE (WITH COIL) HWRAC-E10H2 SERVICE VALVE ASSEMBLY HWRAC-E10H2 ELECTRIC EXPANSION VALVE HWRAC-E10H2 SOUND PROOF COVER ASSEMBLY HWRAC-E10H2 O.L.R COVER CONNECTING CORD (COMPRESSOR)
  • Page 96 HITACHI RAS-18FH6/RAC-18YH6 AW NO. 0024E RAS-25FH6/RAC-25YH6...

This manual is also suitable for:

Rac-18yh6Rac-25yh6Ras-25fh6

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