Hitachi RAS-25YH5 Service Manual
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Hitachi RAS-25YH5 Service Manual

Hitachi RAS-25YH5 Service Manual

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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
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.
RAS_25_35_AW_000covere
INDOOR UNIT
RAS-25YH5
1 PHASE, 50 Hz, 220-230V
(W)
580 (155 ~ 1,080)
(A)
(kW)
2.50 (0.90 ~ 3.10)
(B.T.U./h)
8,530 (3,070 ~ 10,575)
(W)
790 (115 ~ 1,120)
(A)
(kW)
3.40 (0.90 ~ 4.40)
(B.T.U./h)
11,601 (3,070 ~ 15,695)
W
780
H
280
D
210
(kg)
9.5
INDOOR UNIT + OUTDOOR UNIT
1
AW
RAS-25YH5/RAC-25YH5
RAS-35YH5/RAC-35YH5
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ----------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 15
MAIN PARTS COMPONENT --------------------------------------------------- 17
WIRING DIAGRAM ---------------------------------------------------------------- 19
CIRCUIT DIAGRAM --------------------------------------------------------------- 21
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 27
BLOCK DIAGRAM ----------------------------------------------------------------- 31
BASIC MODE ----------------------------------------------------------------------- 33
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 45
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 46
TROUBLE SHOOTING ----------------------------------------------------------- 77
PARTS LIST AND DIAGRAM ------------------------------------------------ 105
DC INVERTER (WALL TYPE)
INDOOR UNIT
OUTDOOR UNIT
RAC-25YH5
3.11-2.97
3.99-3.82
750 (+91)
548
288 (+47)
35
2006.02.09, 18:12
:
https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html
NO. 0011E
CONTENTS
OUTDOOR UNIT
1 PHASE, 50 Hz, 220-230V
980 (155 ~ 1,300)
4.69-4.49
3.50 (0.90 ~ 4.00)
11,942 (3,070 ~ 13,650)
1010 (115 ~ 1,300)
4.84-4.63
4.20 (0.90 ~ 5.00)
14,331 (3,070 ~ 17,745)
780
750 (+91)
280
548
210
288 (+47)
9.5
35
After installation

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Summary of Contents for Hitachi RAS-25YH5

  • Page 1: Table Of Contents

    750 (+91) 750 (+91) DIMENSIONS (mm) 288 (+47) 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. RAS_25_35_AW_000covere 2006.02.09, 18:12 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 2: Safety During Repair Work

    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: Ras-25Yh5 Rac-25Yh5

    SPECIFICATIONS RAC-25YH5 RAS-25YH5 MODEL RAC-35YH5 RAS-35YH5 FAN MOTOR 40 W PWM DC35V FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – EU1011DF 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-25YH5, RAS-35YH5 INDOOR UNIT Top air suction grill Mounting plate Front panel Cabinet Discharge grill Horizontal air diflector (190) Drain When piping is drawn from the left side, exchange the drain hose for the drain cap 17.5...
  • Page 18 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-25YH5, RAC-35YH5 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 19: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS-25YH5, RAS-35YH5 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-25YH5, RAC-35YH5 ITEM COMPRESSOR TYPE EU1011DF POWER SOURCE DC 220 - 350 V OUTPUT 800W WHITE WINDING YELLOW 20°C 2M=1.069 RESISTANCE (Ω) 75°C 2M=1.300 WHITE COMPRESSOR YELLOW 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.
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  • Page 25: Block Diagram

    BLOCK DIAGRAM MODEL RAS-25YH5 / RAC-25YH5 RAS-35YH5 / RAC-35YH5 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...
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  • Page 27 Table 1 Mode data file RAS-25YH5 RAS-35YH5 LABEL NAME VALUE –1 –1 3800 min 4500 min WMAX –1 –1 3800 min 4500 min WMAX2 –1 –1 3150 min 3750 min WSTD –1 –1 2500 min 2800 min WBEMAX –1 –1...
  • Page 28 Table 1 Thermo judgment Item Temperature Thermo judgment (ON) 30°C Room CLMXTP temperature Thermo judgment (OFF) 32°C Thermo judgment (ON) 32°C Outdoor temperature Thermo judgment (OFF) 33°C Table 2 Compressor rpm Temperature Calculated difference compressor rpm (with shift value) 1.66°C –1 2500 min button...
  • Page 29 Cooling Sleep Operation Dehumidifying Operation Room temperature 7 hr 1 hr Set to 7 hours Sleep button Operation lamp Timer lamp Remote control (Sleep) ON See basic Start Stop button operation Indoor fan Sleep Lo Outdoor fan Horizontal air Shut deflector Horizontal Facing down...
  • Page 30 Table 3 Compressor rpm Basic Heating Operation Temperature Calculated difference compressor rpm (with shift value) 1900 min –1 1.66°C 2400 min –1 2.00°C Heating set temperature 2900 min –1 2.33°C (remote control set temperature (+)) 3400 min –1 2.66°C –1 3900 min 3.00°C Dash period...
  • Page 31 Heating Sleep Operation Reversing Valve Defrosting Preheating released Sleep button Reversing valve (cooling "on" model) 2min. 30sec. 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. During this period, the defrost signal is not accepted.
  • Page 32 Silencer Service valve Single-ended union Reversing valve Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer Silencer Service valve Reversing Single-ended union valve Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer – 41 – RAS_25_35_AW_041-072en 2006.02.06, 15:18 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 33: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-25YH5, RAS-35YH5 1. Reset Circuit The reset circuit initializes the microcomputer program when power is ON or OFF Low voltage at pin (7) resets the microcomputer and Hi activates the microcomputer When power “ON” 5V voltage rises and reaches 4.4V, pin (1) of IC521 is set to “Hi”. At this time the microcomputer starts operation.
  • Page 34 2. Receiver Circuit Q141 L201 Fig.2-1 IRR (light receiver unit) receives the infrared signal from the wireless remote controller. The receiver amplifie 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 (30) of the microcomputer.
  • Page 35 4. Auto Sweep Motor Circuit Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pin (15) ~ (18) of microcomputer. As the microcomputer’s outputs change as shown in Fig.4-2, the coils of the auto sweep motor is excite to turn the rotor.
  • Page 36 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 37 7. Fan Motor Drive Circuit Micro computer DC fan motor output Fan motor DC fan motor Speed feedback Fig. 7-1 Voltage at point A Waveform T1 = Low speed T2 = High speed Voltage at point B Waveform Voltage at point C Waveform Fig.
  • Page 38 I RAC-25YH5, 35YH5 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 39 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 40 (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 41 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 42 Fig. 3-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. – 51 – RAS_25_35_AW_041-072en 2006.02.06, 15:18 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
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  • Page 46 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. Fig.
  • Page 47 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) Fig.
  • Page 48 – Fig. 4-4 Power module circuit (U is ON, V is ON) Since current flows at point (B) only when U+ transistor is 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 49 • 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 50 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 51 • 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 52 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 53 Power P.W.B. Reset output Reset 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. Receiving this, the microcomputer converts it to a digital signal and compares it with the internal data to judge whether or not overload control is required.
  • Page 54 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.) Fig.
  • Page 55 6-2. Reset Circuit MAIN P.W.B. RESET OUT. 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. 6-7 shows the reset circuit and Fig. 6-8 shows waveform at each point when power is turned on and off.
  • Page 56 7. Temperature Detection Circuit MAIN P.W.B. C304 C303 C302 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. A thermistor is a negative resistor element which has the characteristics that the higher (lower) the temperature, the lower (higher) the resistance.
  • Page 57 8. Reversing valve control circuit Power P.W.B. MAIN P.W.B. Reversing valve Micro computer DC voltmeter or multimeter Fig. 8-1 Reversing valve control circuit will switch reversing valve ON/OFF according to instruction from indoor microcomputer depending on the operation condition shows in Table 8-1. Voltage at Q701 (between Collector and Emittor) in each operation condition is approximately as shown in Table 8-1 when measured by multimeter.
  • Page 58 9. Electric expansion valve control circuit POWER P.W.B MAIN P.W.B CN15 Microcpmputer Valve4 Valve3 Electric Valve2 expansion Valve1 valve Fig. 9-1 • 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 59 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 60 < 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 61: Service Call Q & A

    SERVICE CALL Q & A Model RAS-25YH5 / RAC-25YH5 RAS-35YH5 / RAC-35YH5 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 62: 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 63 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 64: Trouble Shooting

    TROUBLE SHOOTING RAC-25YH5, 35YH5 PRECAUTIONS FOR CHECKING Power inlet WARNING Remember that voltage of 175 V is applied to the 0V line on the P.W.C or the like as shown in the right diagram. Always keep your hands and metallic things away WARNING from the cabinet.
  • Page 65 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 66 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS-25YH5, 35YH5 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 67 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 68 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 69 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model RAS-25YH5, RAS-35YH5 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAS-25YH5, RAS-35YH5 Blinking of Timer lamp Reason for indication Possible cause Reversing valve defective...
  • Page 70 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-25YH5, RAC-35YH5 – 79 – RAS_25_35_AW_073-094e 2006.02.06, 15:20 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 71: 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 (IMP) using fails, wait 3 minutes state, press the start/stop the PRD checker.
  • Page 72 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.1 and 3 of CN3 on the In the cooling season, set the temperature to 16˚C in the cooling indoor unit control P.W.B.
  • Page 73 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 74 2. Indoor fan does not operate (others are normal) Can the fan be stopped by remote The microcomputer fan PWM Replace the microcomputer. output (at pin N) is 1 - 5V. control? Replace the fan motor. Replace the microcomputer. Perform final operation check. 3.
  • Page 75 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 76: 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 77: Precautions For Servicing

    WARNING PRECAUTIONS FOR SERVICING Be sure that the power switch is turned off or the power cable is disconnected before servicing. Removing the PWBs. 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 78 [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 86 (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-25YH5, RAC-35YH5 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 – 97 – RAS_25_35_AW_095-104e 2006.02.06, 15:20 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 89 – 98 – RAS_25_35_AW_095-104e 2006.02.06, 15:20 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 90: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAS-25YH5, RAS-35YH5 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 OUTDOOR UNIT RAC-25YH5, RAC-35YH5 (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-25YH5, RAS-35YH5 15 16 – 101 – RAS_25_35_AW_095-104e 2006.02.09, 11:21 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 93 INDOOR UNIT PARTS NO. RAS-25YH5 RAS-35YH5 Q'TY PARTS NAME HWRAS-25YH5 901 CABINET HWRAS-25YH5 902 VERTICAL AIR DEFLECTOR-L HWRAS-25YH5 903 VERTICAL AIR DEFLECTOR-R HWRAS-25YH5 904 FAN MOTOR 25W 1.1kg HWRAS-25YH4 907 TANGENTIAL AIR FLOW FAN HWRAS-25YH4 908 FAN SUPPORT ASS'Y HWRAS-25YH4 909...
  • Page 94 OUTDOOR UNIT MODEL: RAC-25YH5, RAC-35YH5 – 103 – RAS_25_35_AW_095-104e 2006.02.06, 15:20 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 95 OUTDOOR UNIT PARTS No. RAC-25YH5 RAC-35YH5 Q'TY PARTS NAME HWRAC-D10EX2 901 BASE HWRAC-25YH4 902 COMPRESSOR 1000W 9.7kg HWRAC-25YH4 903 COMPRESSOR RUBBER HWRAC-25YH4 904 PUSH NUT HWRAC-D10EX2 902 CONDENSER HWRAC-D10EX2 903 REVERSING VALVE HWRAC-25YH4 907 SERVICE VALVE ASS'Y HWRAC-D10EX2 904 ELECTRIC EXPAN. VALVE HWRAC-D10EX2 905 SOUND PROOF COVER ASS'Y HWRAC-25YH4 910...

  • Page 96: Ras-35Yh5 Rac-35Yh5

    HITACHI AW NO. 0011E RAS-25YH5/RAC-25YH5 RAS-35YH5/RAC-35YH5 RAS_25_35_AW_000covere 2006.02.06, 15:09 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

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