Hitachi RAS-24EH4 Service Manual
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Hitachi RAS-24EH4 Service Manual

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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
RAS-24EH4
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
MAY 2012
RAC-24EH4
(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-24EH4/RAC-24EH4
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------ 4
HOW TO USE ---------------------------------------------------------- 6
MAIN PARTS COMPONENT --------------------------------------30
WIRING DIAGRAM ---------------------------------------------------32
CIRCUIT DIAGRAM --------------------------------------------------33
BLOCK DIAGRAM ----------------------------------------------------42
BASIC MODE ----------------------------------------------------------43
REFRIGERATING CYCLE DIAGRAM---------------------------57
AUTO SWING FUNCTION -----------------------------------------58
SERVICE CALL Q & A ----------------------------------------------72
TROUBLE SHOOTING ----------------------------------------------76
PARTS LIST AND DIAGRAM --------------------------------------96
(WALL TYPE)
INDOOR UNIT
RAS-24EH4
1 PHASE, 50 Hz, 220-230V
1,850 (155 - 2,300)
8.50 ~ 8.10
6.00 (0.9 - 6.5)
20,480 (3,072 - 22,190)
1,880 (115 - 2,550)
8.60 ~ 8.25
6.80 (0.9 ~ 8.50)
23,210 (3,072 - 29,000)
1030
295
207
12
NO. 0512E
CONTENTS
OUTDOOR UNIT
RAC-24EH4
850
650
298
45
After installation

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  • Page 1: Table Of Contents

    NO. 0512E RAS-24EH4/RAC-24EH4 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ------------------------------------------------------ 4 HOW TO USE ---------------------------------------------------------- 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------28 MAIN PARTS COMPONENT --------------------------------------30 WIRING DIAGRAM ---------------------------------------------------32 CIRCUIT DIAGRAM --------------------------------------------------33...
  • Page 2 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 fl owing 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 MODEL RAC-24EH4 RAS-24EH4 FAN MOTOR 47 W 30 W FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR – COMPRESSOR JU1015D9 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR YES (INTERNAL) OVERHEAT PROTECTOR 3.15A FUSE (for MICROPROCESSOR) POWER RELAY POWER SWITCH TEMPORARY SWITCH TEST/SERVICE SWITCH...
  • Page 7 Figure showing the installation of Indoor and Outdoor unit Be sure to completely seal any gap. ● The difference in height between the indoor and outdoor unit should be kept max 20m. ● The connecting pipe, no matter big or small, should all be insulated with insulation pipe and then wrapped with vinyl...
  • Page 8 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 specifi cation 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 ●...
  • Page 10 Do not operate the air conditioner without fi lter. Dust may enter the air conditioner and fault may occur. OUTDOOR UNIT DRAIN PIPE Condensed water drain to outside. CONNECTING CORD AIR INLET (BACK, LEFT SIDE) AIR OUTLET MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAS-24EH4 1030 RAC-24EH4 – 8 –...
  • Page 11 INDOOR UNIT INDICATORS TIMER LAMP This lamp lights when the timer is working. OPERATION LAMP This lamp lights during operation. The OPERATION LAMP fl ashes in the following cases during heating. (1) During preheating For about 2–3 minutes after starting up. (2) During defrosting Defrosting will be performed about once every one hour when frost forms on the heat exchanger of the...
  • 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 fi xed on a wall using the fi xture provided. Before fi xing it, make sure the indoor unit can be controlled from the remote controller.
  • Page 13 VARIOUS FUNCTIONS ■ Auto Restart Control If there is a power failure, operation will be automatically restarted when the power is resumed with previous ● operation mode and airfl ow direction. (As the operation is not stopped by remote controller.) If you intend not to continue the operation when the power is resumed, switch off the power supply.
  • Page 14 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 -15°C of the outdoor temperature. ●...
  • Page 15 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 or SILENT. Set the desired room temperature with the TEMPERATURE button (the display indicates the setting).
  • Page 16 COOLING OPERATION Use the device for cooling when the outdoor temperature is -10~ 43°C. If in doors humidity is very high (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 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.
  • Page 18 HOW TO SET THE TIMER Press the (TIME) button. After you change the batteries; TIME OFF TIMER ON TIMER Press the (OFF-TIMER) button, until the (OFF) mark blinks on the display. RESERVE CANCEL You can set the device to turn off at the preset time.
  • Page 19 Press the Set the current time with the Press the (TIME) button again. (TIME) button. TIMER control button. The time indication starts lighting instead of fl ashing. ● The time indication will disappear automatically in 10 second. ● To check the current time setting, press the (TIME) button twice.
  • Page 20 HOW TO SET THE SLEEP TIMER Set the current time at fi rst 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...
  • Page 21 HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER Remove the cover as shown in the fi gure and take out the old Push and pull to the batteries. direction of arrow Install the new batteries. The direction of the batteries should match the marks in the case. CAUTION 1.
  • Page 22 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible Freezing temperature to reduce heat is bad for health and entering a waste of electric room through power. windows. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer Caution operation mode”, together with your wake...
  • Page 23 Federation the operating life of a domestic air conditioner is determined as 7 years from the date of manufacture. Considering the high quality, reliability and high level of operating safety of “Hitachi” products, the actual operating life may considerably exceed the offi cial one.
  • Page 24 ATTACHING THE AIR PURIFYING FILTERS CAUTION Cleaning and maintenance must be carried out only by qualifi ed 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 ●...
  • Page 25 MAINTENANCE CAUTION Cleaning and maintenance must be carried out only by qualifi ed service personal. Before cleaning, stop operation and switch off the power supply. 1. PRE-FILTER Clean the pre-fi lter, as it removes dust inside the room. In case the pre-fi lter is full of dust, the air fl ow will decrease and the cooling capacity will be reduced.
  • Page 26 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.
  • Page 27 CAUTION Cleaning and maintenance must be carried out only by qualifi ed service personal. Before cleaning, stop operation and switch off the power supply. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD Running the unit setting the operation mode to (FAN) and ●...
  • Page 28 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS CONDITION CHECK THE FOLLOWING POINTS If the remote controller is not Do the batteries need replacement? ● transmitting a signal. Is the polarity of the inserted batteries correct? ●...
  • Page 29 Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below ● –10°C (14°F). The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below: Cooling Heating Minimum Maximum Minimum Maximum...

  • Page 30: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-24EH4 – 28 –...
  • Page 31 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-24EH4 – 29 –...

  • Page 32: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Specifi cations MODEL RAS-24EH4 THERMOSTAT MODEL OPERATION MODE COOL HEAT 15.6 (60.1) 20.0 (68.0) INDICATION 15.3 (59.5) 20.7 (69.3) TEMPERATURE 23.6 (74.5) 28.0 (82.4) INDICATION °C (°F) 23.3 (73.9) 28.7 (83.7) 31.6 (88.9) 36.0 (96.8)
  • Page 33 COMPRESSOR MOTOR Compressor Motor Specifi cations MODEL RAC-24EH4 COMPRESSOR MODEL JU1015D9 PHASE SINGLE RATED VOLTAGE AC 220 ~ 230 V RATED FREQUENCY 50 Hz POLE NUMBER CONNECTION 20°C 2M = 1.2984 (68°F) RESISTANCE VALUE 75°C 2M = 1.7671 (167°F) CAUTION When the Air Conditioner has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerant oil inside the compressor.
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  • Page 35: Circuit Diagram

    CIRCUIT DIAGRAM Remote Control – 33 –...
  • Page 36 CIRCUIT DIAGRAM MODEL RAS-24EH4 – 35 –...
  • Page 37 CIRCUIT DIAGRAM MODEL RAC-24EH4 – 37 –...

  • Page 38: Printed Wiring Board Location Diagram

    PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS-24EH4 MAIN P.W.B. Marking on P.W.B COMPONENT SIDE SOLDERING SIDE RECEIVING P.W.B. Marking on P.W.B – 39 –...
  • Page 39 MODEL RAC-24EH4 P.W.B. MAIN – 40 –...
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  • Page 43 Table 1 Mode data fi le RAS-24EH4 LABEL NAME VALUE WMAX 5200 min –1 –1 WMAX2 5200 min WSTD 4750 min –1 WBEMAX 3600 min –1 CMAX 5000 min –1 CSTD 4600 min –1 CKYMAX 3900 min –1 CJKMAX 3900 min –1...
  • Page 44 Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto mode” and temperature difference between indoor temperature and set temperature has a corresponding compressor rpm (calculated value in Table 2) larger than CMAX. (2) Cool Dashed will release when i) a maximum 25 minutes is lapsed and ii) room temperature is lower than set temperature –3°C (thermo off) and iii) when room temperature has achieved setting temperature –1°C then maximum Cool Dashed time will be revised to 20 minutes.
  • Page 45 Notes: The sleep operation starts when the sleep key is pressed. When the sleep key is set, the maximum compressor speed is limited, and the indoor fan is set to “sleep”. 30 minutes after the sleep key is set, the sleep shift of temperature starts, and upper shift is made at least 6 times. If 25˚C is not reached after 6 shifts, shifts repeat unit 25˚C is reached.
  • Page 46 Notes: (1) If the room temperature is (cooling preset temperature) - (1.33°C) or less after 30 seconds from starting the operation, the operation is done assuming as the preset temperature = (room temperature at the time) - (2°C). (2) The indoor fan is operated in the “Lo” mode. During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute. (3) When the operation is started by the themostat turning ON, the start of the indoor fan is delayed 32 seconds after the start of compressor operation.
  • Page 47 Temperature Calculated difference compressor rpm 1.66 1965 min –1 –1 2135 min 2.33 2300 min –1 2.66 2465 min –1 2635 min –1 3.33 2800 min –1 3.66 2965 min –1 3135 min –1 4.33 3300 min –1 4.66 3465 min –1 3635 min –1...
  • Page 48 Notes: The sleep operation starts when the sleep key is pressed. When the sleep key is set, the maximum compressor speed is limited to WSTD+2000/2, and the indoor fan is set to “sleep Lo”. 30 minutes after the sleep key is set, the sleep shift of set temperature starts. The maximum sleep shift of set temperature is 5°C, and the minimum is 12°C.

  • Page 49: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAS-24EH4/RAC-24EH4 – 57 –...
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  • Page 51: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-24EH4 1. Reset Circuit – 59 –...
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  • Page 53 5. Auto Sweep Motor Circuit Fig. 5-1 Auto Sweep Motor Circuit (Horizontal air defl ectors) Fig. 5-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 5-2 are output from pins ● – of the micro computer. Fig.
  • Page 54 6. Room Temperature Thermistor Circuit Fig. 6-1 shows the room temperature The voltage at A depends on the room ● ● thermistor circuit. temperature as shown in Fig. 6-2. 7. Heat exchanger temperature thermistor circuit The circuit detects the indoor heat ●...
  • Page 55 8. Temporary Switch Fig. 8-1 The temporary switch is used to operate the air conditioner temporarily when the wireless remote control ● is lost or faulty. The air conditioner operates in the previous mode at the previously set temperature. However, when the ●...
  • Page 56 DESCRIPTION OF MAIN CIRCUIT OPERATION 1. Power Circuit – 64 –...
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  • Page 64: Service Call Q

    SERVICE CALL Q & A – 72 –...
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  • Page 68: Trouble Shooting

    TROUBLE SHOOTING – 76 –...
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  • Page 73 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. MODEL RAS-24EH4 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Blinking of Timer lamp Reason for indication Possible cause Reversing valve defective (1) Reversing valve defective...
  • Page 74 CHECKING INDOOR UNIT ELECTRICAL PARTS MODEL RAS-24EH4 1. Power does not come on (no operation) – 82 –...
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  • Page 82 1. Switch OFF main power supply. 2. Short circuit between JW001 and JW002. 3. Switch ON main power supply – LD302 will blink 1 time. 4. (Within 3 minutes) Press Test/Service Switch for 1 second or more. 5. Self-diagnosis result will be shown – LD303 will ON (LIT) and LD301 will be blinking. Then refer to diagnosis table 2.
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  • Page 86 CHECKING THE REMOTE CONTROLLER – 94 –...
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  • Page 88: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAS-24EH4 – 96 –...
  • Page 89 MODEL RAS-24EH4 PART NO. Q’TY / UNIT PARTS NAME RAS-24EH4 PMRAS-70YHA CABINET PMRAS-40CNH2 MOUNTING PLATE PMRAS-70YHA FAN MOTOR PMRAS-70YHA TANGENTIAL FAN PMRAS-25CNH2 P-BEARING ASSY PMRAS-51CHA1 FAN MOTOR BASE PMRAS-60YHA2 CYCLE ASSY PMRAS-51CHA1 FAN COVER PMRAS-18CP5 PIPE SUPPORT PMRAS-70YHA DRAIN PAN ASSY...
  • Page 90 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-24EH4 – 98 –...
  • Page 91 MODEL RAC-24EH4 PART N0. Q’TY / UNIT PARTS NAME RAC-24EH4 PMRAC-60YHA2 SV-COVER PMRAC-60YH7 COMPRESSOR KPNT1 PUSH NUT RAC-2226HV COMPRESSOR RUBBER PMRAC-50NH4 CONDENSER PMRAC-X24CAT REVERSING VALVE PMRAC-25NH4 ELECTRICAL EXPANSION COIL PMRAC-50NH4 VALVE (2S) PMRAM-72QH5 VALVE (4S) PMRAC-40CNH2 THERMISTOR (OH) PMRAC-25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC-X13CX OVERLOAD RELAY COVER PMRAC-50YH7A...
  • Page 92 HITACHI RAS-24EH4 / RAC-24EH4 PM NO. 0512E Printed in Malaysia...

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Rac-24eh4

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