Hitachi RAS-30CH6 Service Manual
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Hitachi RAS-30CH6 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
DECEMBER 2005
0301E (30CH6) cover
RAS-30CH6
RAC-30CH6
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
1
PM
RAS-30CH6/RAC-30CH6
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ----------------------------------------------------- 4
HOW TO USE ---------------------------------------------------------- 6
MAIN PARTS COMPONENT ------------------------------------- 32
WIRING DIAGRAM -------------------------------------------------- 34
CIRCUIT DIAGRAM ------------------------------------------------- 35
BLOCK DIAGRAM --------------------------------------------------- 39
BASIC MODE --------------------------------------------------------- 41
REFRIGERATING CYCLE DIAGRAM ------------------------- 47
AUTO SWING FUNCTION ---------------------------------------- 55
TROUBLE SHOOTING --------------------------------------------- 62
PARTS LIST AND DIAGRAM ------------------------------------ 65
(WALL TYPE)
INDOOR UNIT
RAS-30CH6
1 Ø, 50 Hz, 220 ~ 240V
2900 - 2900
13.3 - 12.2
8.1 - 8.1
27,640 - 27,640
2900 - 2900
13.3 - 12.2
8.8 - 8.8
30,030 - 30,030
1150
333
245
15
16/12/05, 2:33 PM
NO. 0301E
CONTENTS
OUTDOOR UNIT
RAC-30CH6
925
875
315
75
After installation

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  • Page 1: Table Of Contents

    NO. 0301E RAS-30CH6/RAC-30CH6 SERVICE MANUAL TECHNICAL INFORMATION REFER TO THE FOUNDATION MANUAL FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ----------------------------------------------------- 4 HOW TO USE ---------------------------------------------------------- 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 30 MAIN PARTS COMPONENT ------------------------------------- 32 WIRING DIAGRAM -------------------------------------------------- 34...
  • 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 stopping 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-30CH6 RAC-30CH6 30 W FAN MOTOR 80 W FAN MOTOR CAPACITOR 6.0 F,400V FAN MOTOR PROTECTOR YES (INTERNAL) COMPRESSOR – 2JD514E COMPRESSOR MOTOR CAPACITOR 60 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 CAUTION In case the pipe length is more than 8m, add refrigerant R22 at 40 gram per every meter exceeds. However, pipe length shall not exceed 30m. above 50mm Be sure to completely above 100mm above...
  • 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 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 So as to operate the whole unit. (Refer page 10) OUTDOOR UNIT AIR INLET (BACK, LEFT SIDE) AIR OUTLET Blow out warm air. MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAS-30CH6 1150 RAC-30CH6 – 8 – 0301E (30CH6) 6-9 16/12/05, 2:37 PM...
  • Page 11 OPERATION INDICATOR TEMPORARY SWITCH Temporary Switch Press Non-conductor Stick Use this switch to start and stop when the remote controller does not work. [Use non-conductor stick (example toothpick)] By pressing the temporary switch, the operation is done in previously set operation mode. When the operation is done using the temporary switch after the power source is turned off and turn on again, the operation is done in automatic mode.
  • Page 12 NAMES AND FUNCTIONS OF EACH PART 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 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 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. Press the FUNCTION selector so that the display indicates (HEAT).
  • 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 automatically. The FAN SPEED button does not work.
  • Page 16 COOLING OPERATION Use the device for cooling when the outdoor temperature is 22-42°C. If humidity is very high (over 80°C) indoors, 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.* START Press the...
  • Page 18 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 19 Set the current time with the Press the (TIME) button again. Press the (TIME) button. TIMER control button. The time indication starts lighting instead of flashing. 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 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 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 swing 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 old batteries. Push and pull to the 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 “sleep timer operation Caution mode”, together with your wake up time in the...
  • 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 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 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 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 CAUTION: (Model RAS-30CH6/RAC-30CH6) This unit is intend for operating at a power supply network with a system impedance of maximum 0.18+j0.11 Ohm at the house main power supply connection point. The user has to make sure, that the unit will be operated only at a power supply network under this condition.

  • Page 32: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-30CH6/RAC-30CH6 Unit : mm 17.5 Wireless remote controller About When piping is drawn Viewed from back horizontally, exchange (bottom direction pipe the drain hose for the lead-out) drain cap. Notes: 1. Service space (free space needed for servicing) is 200mm on the right, 100mm on the left and 50mm on top.
  • Page 33 MODEL RAC-30CH6 Note: 1. 200mm or more servicing space is required above the outdoor unit. – 31 – 0301E (30CH6) pg 30-34 16/12/05, 2:40 PM...

  • Page 34: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Specifications MODEL RAS-30CH6 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 35 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-30CH6 COMPRESSOR MODEL 2JD514E PHASE SINGLE RATED VOLTAGE 220 ~ 240 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 65.2 A POLE NUMBER WHITE PROTECTOR ORANGE CONNECTION CAPACITOR 20°C RM = 1.022 (68°F) RA = 2.142 RESISTANCE VALUE 75°C RM = 1.243...
  • Page 36 – 34 – 0301E (30CH6) pg 30-34 16/12/05, 2:41 PM...

  • Page 37: Circuit Diagram

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

  • Page 38: Printed Wiring Board Location Diagram

    PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS-30CH6/RAS-30CH6 STICK RELAY POWER RELAY – 37 – 0301E (30CH6) pg 37 16/12/05, 2:45 PM...
  • Page 39 – 39 – 0301E (30CH6) pg 39 16/12/05, 2:46 PM...

  • Page 40: Basic Mode

    BASIC MODE MODEL RAS-30CH6/RAC-30CH6 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 EXCHANGER THERMISTOR Cancel Operation lamp OFF timer Timer lamp Timer memory (OFF timer during stop)
  • Page 41 Operation mode Cooling Sensor dehumidification Heating Automatic Control function • Sleep operation is executed 5 deg down for each operation mode. Set circulation velocity Set circulation velocity LO (sleep operation) Set circulation temperature velocity 2 deg up 60 minutes LO (sleep operation) Table 1 Specifications Other detailed specifications Start/stop switch...
  • Page 42 Table 1 Specifications (2) Compensation continuously occurs, and for the advance Item RAS-30CH6 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 43: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAS-30CH6/RAC-30CH6 COOLING, DEHUMIDIFYING, DEFROSTING SUCTION TANK INDOOR UNIT OUTDOOR UNIT SERVICE VALVE SINGLE-ENDED UNION (5/8) REVERSING VALVE PRESSURE BY PASS SILENCER VALVE CAPILLARY FLOW CHECK SERVICE VALVE 6.35 (1/4) VALVE SINGLE-ENDED COOL/HEAT UNION CAPILLARY HEATING SUCTION...

  • Page 44: 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 45 2. Reset Circuit Micro computer (AX-3T2) (AX-3T3) Q202 AX-3X Q201 C202 DC12V Line DC5V Line Base POWER ON POWER OFF Micro computer Pin 7 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 46 3. Buzzer Circuit Micro computer (AX-3X) 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 47 6. Service Operation Circuit R614 Micro computer (AX-3X) Cool Normal R629 FORCE COOL 43 C602 R630 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 48 7. Auto Sweep Motor Circuit CN12 Auto sweep motor for horizontal air deflectors Micro computer Rotor IC501 Fig. 7-1 Auto Sweep Motor Circuit (Horizontal air deflectors) Fig. 7-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 7-2 are output from pins –...
  • Page 49 8. Room Temperature Thermistor Circuit Fig. 8-1 shows the room temperature The voltage at A depends on the room thermistor circuit. temperature as shown in Fig. 8-2. Room Micro temperature computer thermistor R309 Room temp. input R310 C302 Fig. 8-1 Fig.
  • Page 50 10. Temporary Switch TEMPORARY SW Temporary switch R609 MICRO COMPUTER Fig. 10-1 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 power switch is set to OFF, it starts automatic operation.
  • Page 51 – 55 – 0301E (30CH6) pg 47-68 16/12/05, 2:49 PM...

  • Page 52: 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 53 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 54 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 55 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 56 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 57 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 58: 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 59 *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-30CH6 Fan Speed Cooling Heating 32.6 32.6 28.0 27.6...
  • Page 60 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 heating (2) Heat-exchanger thermistor is –...

  • Page 61: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAS-30CH6 30 31 – 65 – 0301E (30CH6) pg 47-68 16/12/05, 2:49 PM...
  • Page 62 MODEL RAS-30CH6 PART N0. Q’TY / UNIT PARTS NAME RAS-30CH6 PMRAS-72CHA3 002 CABINET PMRAS-72CHA3 013 MOUNTING PLATE PMRAS-72CHA3 006 FAN MOTOR PMRAS-72CHA3 021 TANGENTIAL FAN PMRAS-72CHA3 017 P-BEARING ASSY PMRAS-72CHA3 007 FAN MOTOR SUPPORT PMRAS-72CHA3 003 CYCLE ASSY PMRAS-72CHA3 005...
  • Page 63 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-30CH6 – 67 – 0301E (30CH6) pg 47-68 16/12/05, 2:49 PM...
  • Page 64 MODEL RAC-30CH6 PART N0. Q’TY / UNIT PARTS NAME RAC-30CH6 PMRAC-30JHVP1 903 CABINET PMRAC-81CHA3 912 VALVE (5S) PMRAC-51CHA1 908 VALVE (2S) PMRAC-81CHA3 903 COMPRESSOR 2400W, 27kg PMRAC-81CHA3 915 STRAINER (COND) PMRAC-30CVP1 903 PROPELLER FAN PMRAC-81CHA3 909 SIDE PLATE PMRAC-81CHA3 914 BACK PLATE PMRAC-30CVP1 906 TOP COVER...
  • Page 65 RAS-30CH6 / RAC-30CH6 PM NO. 0301E Printed in Malaysia 0301E (30CH6) cover 16/12/05, 2:33 PM...

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