Hitachi RAS-24GH4 Service Manual
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Hitachi RAS-24GH4 Service Manual

Hitachi RAS-24GH4 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
MARCH 2004
RAS-24GH4
RAC-24GH4
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAS-24GH4/RAC-24GH4
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ----------------------------------------------------- 5
SAFETY PRECAUTION --------------------------------------------- 7
HOW TO USE ---------------------------------------------------------- 9
MAIN PARTS COMPONENT ------------------------------------- 32
WIRING DIAGRAM -------------------------------------------------- 34
CIRCUIT DIAGRAM ------------------------------------------------- 35
BLOCK DIAGRAM --------------------------------------------------- 39
BASIC MODE --------------------------------------------------------- 41
REFRIGERATING CYCLE DIAGRAM ------------------------- 47
AUTO SWING FUNCTION ---------------------------------------- 52
TROUBLE SHOOTING --------------------------------------------- 59
PARTS LIST AND DIAGRAM ------------------------------------ 62
(WALL TYPE)
INDOOR UNIT
RAS-24GH4
1 Ø, 50 Hz, 220 - 230 - 240V
2470 - 2490 - 2560
11.80 - 11.40 - 11.20
6.45 - 6.50 - 6.55
22,010 - 22,180 - 22,350
2610 - 2660 - 2720
12.3 - 12.0 - 11.8
7.55 - 7.60 - 7.70
25,760 - 25,930 - 26,270
1030
295
183
12
:
https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html
NO. 0211E
CONTENTS
OUTDOOR UNIT
RAC-24GH4
850
650
298
57
After installation

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Summary of Contents for Hitachi RAS-24GH4

  • Page 1: Table Of Contents

    NO. 0211E RAS-24GH4/RAC-24GH4 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ----------------------------------------------------- 5 SAFETY PRECAUTION --------------------------------------------- 7 HOW TO USE ---------------------------------------------------------- 9 CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 30 MAIN PARTS COMPONENT ------------------------------------- 32...

  • Page 2: Safety During Repair Work

    SAFETY DURING REPAIR WORK 1. 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. 2. 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 1. 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). 2.
  • 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 or stop operation, 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 recommended to stop the operation and to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Specifications

    SPECIFICATIONS MODEL RAS-24GH4 RAC-24GH4 30 W FAN MOTOR 40 W FAN MOTOR CAPACITOR 2.5 F,450V FAN MOTOR PROTECTOR YES (INTERNAL) COMPRESSOR – 5JS315DAE COMPRESSOR MOTOR CAPACITOR 45 F, 450VAC OVERLOAD PROTECTOR YES (INTERNAL) OVERHEAT PROTECTOR YES (INTERNAL) FUSE (MICRO COMPUTER CIRCUIT) 3.15A...
  • Page 7 Figure showing the installation of Indoor and Outdoor unit The installation height of indoor unit must be 2.3m or more in a non public area CAUTION CAUTION In case the pipe length is more than 8m, add refrigerant R22 at 25 gram per every meter exceeds.

  • Page 8: Safety Precaution

    SAFETY PRECAUTION Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit. Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which, if not observed strictly, may cause death or serious injury. The “Caution” section contains matters which may result in serious consequences if not observed properly.
  • Page 9 PRECAUTIONS DURING OPERATION The product shall be operated under the manufacturer specification and not for any other intended use. Do not attempt to operate the unit with wet hands, this could cause fatal accident. When operating the unit with burning equipments, regularly ventilate the room to avoid oxygen insufficiency.

  • Page 10: Names And Functions Of Each Part

    • When heating operation, drain or defrosted water flows out from outdoor unit. Don’t close drain outlet portion in chilly area so as not to freeze these. MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAS-24GH4 1030 RAC-24GH4 – 9 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 11 (2) During defrosting Defrosting will be performed about once an hour when frost forms on the heat exchanger of the outdoor unit, for 5–10 minutes each time. HITACHI TIMER LAMP This lamp lights when the timer is working. FILTER LAMP...
  • Page 12 NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting is controlled electronically, the range of control may be shorter. This unit can be fixed on a wall using the fixture provided. Before fixing it, make sure the indoor unit can be controlled from the remote controller.

  • Page 13: Automatic Operation

    AUTOMATIC OPERATION The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the initial room temperature. The selected mode of operation will not change when the room temperature varies. Press the FUNCTION selector so that the display indicates the (AUTO) mode of operation.

  • Page 14: Heating Operation

    HEATING OPERATION Use the device for heating when the outdoor temperature is under 21°C. When it is too warm (over 21°C), the heating function may not work in order to protect the device. In order to keep reliability of the device, please use this device above –10°C of the outdoor temperature. Press the FUNCTION selector so that the display indicates (HEAT).

  • Page 15: Dehumidifying Operation

    DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16°C. When it is under 15°C, the dehumidifying function will not work. Press the FUNCTION selector so that the display indicates (DEHUMIDIFY). ˚ The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.

  • Page 16: Cooling Operation

    COOLING OPERATION Use the device for cooling when the outdoor temperature is 22-42°C. If indoor humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit. Press the FUNCTION selector so that the display indicates (COOL).

  • Page 17: Fan Operation

    FAN OPERATION You can use the device simply as an air circulator. Use this function to dry the interior of the indoor unit at the end of summer. Press the FUNCTION selector so that the display indicates (FAN). Press the (FAN SPEED) button.* START Press the...
  • Page 18 HOW TO SET THE SLEEP TIMER Set the current time at first if it is not set before (see the pages for setting the current time). Press the (SLEEP) button, and the display changes as shown below. Mode Indication 1 hour 2 hours 3 hours 7 hours...

  • Page 19: How To Set The Timer

    HOW TO SET THE TIMER Time, Day, Month Set the current month and TIME, DAY, day with the TIMER control After you change the MONTH button. batteries; (current time, day, month) OFF TIMER RESET ON TIMER OFF-Timer Press the (OFF-TIMER) button.
  • Page 20 Set the current time with the Press the (TIME) button again. Press the TIMER control button. The time indication starts lighting (TIME) button. instead of flashing. The time indication will disappear automatically in 10 second. To check the current time setting, press the (TIME) button twice.
  • Page 21 Explanation of the sleep timer The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for people’s health. You can set the sleep timer to turn off after 1, 2, 3 or 7 hours. The FAN SPEED and room temperature will be controlled as shown below.
  • Page 22 ADJUSTING THE AIR DEFLECTOR Adjustment of the conditioned air in the upward and downward directions. The horizontal air deflector is automatically set to the proper angle suitable for each operation. The deflector can be swung RESET up and down continuously and also set to the desired angle using the “...
  • Page 23 HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER Remove the cover as shown in the figure and take out the Push and pull to the old batteries. direction of arrow Install the new batteries. The direction of the batteries should match the marks in the case.
  • Page 24 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible to Freezing temperature reduce heat is bad for health and a entering the waste of electric power. room through windows. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer Caution operation mode”, together with your wake up...
  • Page 25 FOR USER’S INFORMATION The Air Conditioner And The Heat Source In The Room Caution If the amount of heat in the room is above the cooling capability of the air conditioner (for example: more people entering the room, using heating equipments and etc.), the preset room temperature cannot be achieved.
  • Page 26 ATTACHING THE AIR CLEANSING AND DEODORIZING FILTERS CAUTION Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off the power supply. Open the front panel. Pull up the front panel by holding it at both sides with both hands.

  • Page 27: Maintenance

    MAINTENANCE CAUTION Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off the power supply. AIR FILTER Clean the air filter, as it removes dust inside the room. In case the air filter is full of dust, the air flow will decrease and the cooling capacity will be reduced.
  • Page 28 Washable Front Panel Remove the front panel and wash with clean water. Wash it with a soft sponge. After using neutral detergent, wash thoroughly with clean water. When front panel is not removed, wipe it with a soft dry cloth. Wipe the remote controller thoroughly with a soft dry cloth.

  • Page 29: Regular Inspection

    CAUTION Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off the power supply. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD Run the unit by setting the operation mode to (COOL), the temperature to 32°C and the fan speed to HI for about half a day on a fine day, and dry the whole of the unit.
  • Page 30 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS. CONDITION CHECK THE FOLLOWING POINTS Is the fuse all right? Is the voltage extremely high or low? When it does not operate Is the circuit breaker “ON”? Was the air filter cleaned? Does sunlight fall directly on the outdoor unit? When it does not cool well...

  • Page 31: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-24GH4 1019 Top air suction grille 1030 Front cover Vertical deflector Discharge grille Horizontal deflector About View from back (Pipe lead-out) 17.5 120.5 When piping is drawn horizontally, exchange the drain hose for the drain cap...
  • Page 32 MODEL RAC-24GH4 Handle Handle Air outlet Air suction grille Holes for anchor bolt (2-ø12) More than More than Fixing hole Service space Notch for anchor bolt (2-ø12 Notchs) Note: 1. 200mm or more servicing space is required above the outdoor unit. –...

  • Page 33: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Specifications MODEL RAS-24GH4 THERMOSTAT MODEL OPERATION COOL HEAT 17.6 (63.7) 19.6 (67.3) INDICATION 17.3 (63.1) 19.3 (66.7) TEMPERATURE °C 25.6 (78.1) 27.6 (81.7) INDICATION 25.3 (77.5) 27.3 (81.1) 33.6 (92.5) 35.6 (96.1) INDICATION 33.3 (91.9)
  • Page 34 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-24GH4 COMPRESSOR MODEL 2JS315DAB PHASE SINGLE RATED VOLTAGE 220 ~ 240 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 63.0 ~ 67.0 POLE NUMBER WHITE PROTECTOR ORANGE CONNECTION CAPACITOR 20°C RM = 0.830 (68°F) RA = 2.257 RESISTANCE VALUE 75°C...
  • Page 35 – 34 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 36: Circuit Diagram

    CIRCUIT DIAGRAM Remote Control Key matrix table Output Input Door open Start/Stop Operation selection Fan speed selection Automatic swing Door shut Start/Stop Super silent cooling – – Door open On timer Hour up Hour down present time • Door shut –...

  • Page 37: Printed Wiring Board Location Diagram

    PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS-24GH4 M-BOARD TERMINAL RESISTOR POWER RELAY BOARD POWER-SW SYMBOL RESISTANCE TOLERANCE POWER FORM SYMBOL RESISTANCE TOLERANCE POWER FORM SYMBOL RESISTANCE TOLERANCE POWER FORM SYMBOL RESISTANCE TOLERANCE POWER FORM L (BROWN) WHITE ± 5% ± 5% ±...
  • Page 38 – 39 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 39: Basic Mode

    BASIC MODE MODEL RAS-24GH4/RAC-24GH4 Operation mode Cooling Sensor dehumidification Heating Automatic Control function Start/stop button, Start/stop button Operation lamp basic mode Start/stop button TEMPERATURE OF INDOOR HEAT Reservation Cancel EXCHANGER THERMISTOR Operation lamp OFF timer Timer lamp Timer memory (OFF timer during stop)
  • Page 40 Operation mode Cooling Sensor dehumidification Heating Automatic Control function • Sleep operation is executed 5 deg down for each operation mode. Set circulation velocity LO (sleep operation) Set circulation temperature velocity 60 minutes LO (sleep operation) Table 1 Specifications Other detailed specifications 2 deg up Start/stop switch temperature...
  • Page 41 Table 1 Specifications (2) Compensation continuously occurs, and for the advance Item RAS-24GH4 time, the temperature difference between The “Attained” state is monitored and a “Not attained” check is the set temperature without sleep shift Automatic done to revise the compensation time (HT).

  • Page 42: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAS-24GH4/RAC-24GH4 COOLING, DEHUMIDIFYING, DEFROSTING SUCTION TANK INDOOR UNIT OUTDOOR UNIT SERVICE VALVE SINGLE-ENDED UNION (4/8) 12.7 REVERSING VALVE SERVICE VALVE CAPILLARY STRAINER SINGLE-ENDED UNION CHARGING PIPE SUCTION HEATING TANK INDOOR UNIT SERVICE VALVE SINGLE-ENDED OUTDOOR UNIT UNION (4/8) 12.7...

  • Page 43: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION 1. ON / OFF The “ON / OFF” and “Timer reserve button” and “Sleeping” function independently. Their operations are shown in Fig. 1-1. Start Stop Start ON/OFF button Timer reserve button (Sleeping) When OFF timer (sleeping) is set Operation lamp...
  • Page 44 2. Reset Circuit Micro computer (AX-3T3) Q512 Q511 C512 DC12V Line DC5V Line Base POWER ON POWER OFF Micro computer Pin 26 The reset circuit is used to reset the program to its initial settings when the power is turned on or when the power is recovered after a power failure.
  • Page 45 3. Buzzer Circuit Micro computer (AX-3T3) BUZZER When the buzzer is to be activated, buzzer output pin of the micro computer alternates between ON and OFF repeatedly at 4kHz and Q302 is turned ON/OFF accordingly. A 4kHz voltage is applied to the buzzer and the diaphragm of the buzzer vibrates to output 4kHz sound.
  • Page 46 6. Service Operation Circuit Micro computer R606 (AX-3T3) Cool FORCE COOL 42 Normal Use the service switch to select “Cooling” temporarily when the interior electric equipment has troubled. Setting the switch to “Cooling” causes continuous cooling room temperature control. To control the room temperature, turn on and off the disconnect switch.
  • Page 47 – 52 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 48: Service Call Q & A

    SERVICE CALL Q & A Cooling operation While cooling, Check whether frost sticks If cooling is performance compressor sometimes stops on the heat exchanger of in- when the room temperature abruptly. door unit or not. is low, frost may stick on the Wait for 3 –...
  • Page 49 Heating operation Air does not come out when It is not a trouble. The fan is When starting the operation, starting a heating operation. stopped to avoid cold wind. the heat exchanger is cold and, therefore, the fan is stopped. Wait 2–3 minutes.
  • Page 50 Automatic operation automatic According to the room operation mode determined? temperature, cooling or dehumidifying operation is automatically selected. Cooling: When room temperature is approx. 27°C or higher Dehumidifying: When room temperature is between approx. 23°C and 27°C Heating: When room temperature is approx.
  • Page 51 Common, etc. There difference There may be a difference between room between room temperature setting and temperature setting and actual room temperature. actual room temperature on account room structure, air flow, etc. If there is a difference from the room temperature, adjust the set temperature to keep living space at a comfortable temperature.
  • Page 52 Wireless remote controller 1) When the “Automatic” 1) When the operation mode room temperature operation mode is “Automatic”, the fan sensing thermistor in the selected, “Automatic” speed is automatically indoor unit detects the room does not change by fixed to “Automatic”. temperature and, according pressing the fan speed to the particular temperature,...
  • Page 53 In spite of timer “Preprogram”, Isn’t the time over the pre- time setting programmed time? extinguished. As soon as the prepro- grammed time is reached, the time setting disappears. After selecting “Dehumidifying” “Dehumidifying” operation operation, the “LO” fan speed” mode, the fan speed mode is forcibly selected.

  • Page 54: Trouble Shooting

    TROUBLE-SHOOTING No cooling or heating *1 Before using the service switch, No operation at all. disengage and engage the plug. Do not Operates by setting the service operate the remote controller. switch to forced cooling? Check the following parts and replace if faulty 1) Current fuse Remove and check the continuity across.
  • Page 55 *4 Wait for 3 minutes before forced Check the circuit board inside parts. re-operation by the service switch. Replace faulty part When checking, carry out a self diagnosis by indoor indicator lamp. CN6 BLUE-RED (V) RAS-24GH4 Fan Speed Cooling Heating 30.8 31.5 26.4 26.4...
  • Page 56 Timer-Lamp, break-down checking in blinking sign. Check the break-down factor from the frequency of timer-lamp blinking. Mode of Timer-Lamp blinking Indication Factor Estimated Break-Down Part 4-way valve not working (1) 4-way valve is not working. Inside temperature is low in (2) Heat-exchanger thermistor is –...

  • Page 57: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAS-24GH4 – 62 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 58 MODEL RAS-24GH4 PART N0. Q’TY / UNIT PARTS NAME RAS-24GH4 PMRAS-63CHA2 002 CABINET PMRAS-40CNH2 023 MOUNTING PLATE PMRAS-51CHA1 002 FAN MOTOR PMRAS-51CHA1 003 TANGENTIAL FAN PMRAS-25CNH2 005 P-BEARING ASSY PMRAS-51CHA1 004 FAN MOTOR BASE PMRAS-24GH4 CYCLE ASSY PMRAS-51CHA1 020 FAN COVER...
  • Page 59 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-24GH4 – 64 – https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 60 MODEL RAC-24GH4 PART N0. Q’TY / UNIT PARTS NAME RAC-24GH4 PMRAC-24JHP3 BASE PMRAC-24GH4 COMPRESSOR PMRAC-18GH4 COMPRESSOR RUBBER PMRAC-18GH4 VALVE (2S) PMRAC-18GH4 VALVE (4S) PMRAC-24CH3 CONDENSER PMRAC-40CNH2 918 FAN MOTOR SUPPORT PMRAC-18CH1 FAN MOTOR PMRAC-40CNH2 917 PROPELLER FAN PMRAC-51CHA1 903 TERMINAL BOARD PMRAC-24GH4 COMPRESSOR CAPACITOR PMRAC-63CHA2 908...
  • Page 61 PM NO. 0211E RAS-24GH4 / RAC-24GH4 Printed in Malaysia https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

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