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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 (kg)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
MARCH 2004
RAS-14CH4
RAS-14CH4
RAC-14CH4
RAC-14CH4
INDOOR UNIT
RAS-14CH4
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
INDOOR UNIT + OUTDOOR UNIT
PM
RAS-14CH4
RAC-14CH4
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ............................................................... 5
SAFETY PRECAUTION ...................................................... 6
HOW TO USE ..................................................................... 8
CONSTRUCTION AND DIMENSIONAL DIAGRAM ........ 27
MAIN PARTS COMPONENT ............................................ 28
WIRING DIAGRAM ........................................................... 30
BASIC MODE .................................................................... 35
AUTO SWING FUNCTION ............................................... 39
REFRIGERATING CYCLE DIAGRAM .............................. 40
TROUBLESHOOTING ....................................................... 47
PARTS LIST AND DIAGRAM ........................................... 49
WALL TYPE
1Ø, 220 V, 50 Hz
1,290
6.0
3.55
12,120
1,370
6.30
4.10
14,000
815
298
179
8
NO. 0204E
CONTENTS
OUTDOOR UNIT
RAC-14CH4
820
520
280
39
❈
After installation
H.A.P.M.
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Summary of Contents for Hitachi RAS-14CH4
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Page 1: Table Of Contents
NO. 0204E RAS-14CH4 RAC-14CH4 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ............... 5 SAFETY PRECAUTION ............6 HOW TO USE ..............8 CONSTRUCTION AND DIMENSIONAL DIAGRAM ..27 MAIN PARTS COMPONENT ..........28... - 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).
- 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 MΩ (1/2W) Staple Earth wire Bare copper wire (for body earth) Fig. 3. Grounding of the working table Soldering iron Grounding wire Screw stop at the screwed...
- Page 5 CAUTION 1. 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. 2. 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 The Length of Indoor Unit Connecting Cord Figure showing the Installation of Indoor and Outdoor unit. about 0.9m about 1.6m CAUTION In case the pipe length is more than 8m, add refrigerant R22 at 25 gram per every meter exceeds. However, pipe length shall not exceed 10m.
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Page 7: Specifications
SPECIFICATIONS MODEL RAS-14CH4 RAC-14CH4 FAN MOTOR 10 W 20 W FAN MOTOR CAPACITOR 1 µF, 450 V 2.5 µF, 450 V FAN MOTOR PROTECTOR YES (INTERNAL) YES (INTERNAL) COMPRESSOR SH933RC2-U COMPRESSOR MOTOR CAPACITOR 35 µF, 440 V OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICRO COMPUTER) 3.0 A... -
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 So as to operate the whole unit. (Refer page 10) OUTDOOR UNIT Drain pipe Condensed water drain to outside. Connecting cord Air inlet (Back and right side) Air outlet MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAS-14CH4 RAC-14CH4 – 8 –...
- Page 11 OPERATION INDICATOR Press the mark “PUSH” on the left and right sides of the suction grille to open it. PUSH PUSH After the work is finished, slightly lift the suction grille and then close it. Press the mark “PUSH” on the left and right sides of the suction grille to fix it securely.
- 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 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 the (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%) indoors, some dew may form on the air outlet grille of the indoor unit. Press the FUNCTION selector so that the display indicates the (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 the (FAN). Press the (FAN SPEED) button.
- 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 Press the Set the current time with Press the (TIME) button again. (TIME) button. the 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 DEFLECTORS Adjustment of the conditioned air in the upward and downward directions. According to “Dehumidifying” and “Cooling” operation, the horizontal air deflector is automatically set to the proper angle suitable for each operation. The deflector can be swung up and down 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 is reduce heat bad for health and a entering 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 MAINTENANCE CAUTION Cleaning and maintenance must be carried out only by qualified service personal. Before these cleaning, stop operation and disconnect the power supply. Air filter Clean the air filter, as it removes dust inside the room. It should be washed when the (FILTER) lamp lights.
- Page 27 2. CLEANING OF FRONT COVER, ETC. Wipe it with a soft dry cloth. CAUTION When it is excessively dirth, wipe with a Never use hot water (above 40°C). soft cloth soaked in lukewarm water or benzine, gasoline, acid, thinner neutral detergent. Then wipe thoroughly or a brush, because they will with a soft dry cloth.
- Page 28 AFTER SALES SERVICE AND WARRANTY WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS. CONDITION CHECK THE FOLLOWING POINTS Is the fuse all right? When it does not operate Is the voltage extremely high or low? Is the circuit breaker “ON”? Was the air filter cleaned? Does sunlight fall directly on the outdoor unit? Is the air flow of the outdoor unit obstructed?
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Page 29: Construction And Dimensional Diagram
CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-14CH4 785(30-7/8") 17.5 Wireless remote controller Top air suction grille Air suction grille Front cover 6(1/4") 179(7-1/16") 179(7-1/16") 815(32-1/16") Mounting plate Cabinet Horizontal air Discharge grille Vertical air deflector deflector 7(1/4") 182.5(7-3/16") 182.5(7-3/16") 450(17-11/16") 58(2-5/16") 58(2-5/16") -
Page 30: Main Parts Component
MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS-14CH4 THERMOSTAT MODEL OPERATION MODE INDICATION COOL HEAT 17.6 (63.7) 19.6 (67.3) INDICATION 17.3 (63.1) 19.3 (66.7) 25.6 (78.1) 27.6 (81.7) TEMPERATURE INDICATION °C (°F) 25.3 (77.5) 27.3 (81.1) INDICATION 33.6 (92.5) 35.6 (96.1) 33.3 (91.9) - Page 31 COMPRESSOR Compressor Motor Specifications MODEL RAC-14CH4 COMPRESSOR MODEL SH933RC2-U PHASE SINGLE RATED VOLTAGE 220 - 240V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 27 A POLE NUMBER RUNNING CAPACITOR POWER CONNECTION SOURCE INTERNAL PROTECTOR 20°C RM = 2.87 (68°F) RA = 2.15 RESISTANCE VALUE (Ω) 75°C...
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Page 32: Wiring Diagram
WIRING DIAGRAM MODEL RAS-14CH4, RAC-14CH4 : COMPRESSOR : STICK RELAY : FAN MOTOR : REVERSING VALVE : POWER SWITCH : POWER RELAY : 1,000 µF CAPACITOR : THERMAL FUSE : INDOOR FAN MOTOR PROTECTOR : SURGE ABSORBER (INTERNAL) : THERMISTOR : 1 µF CAPACITOR... - Page 33 – 31 –...
- Page 34 MODEL RAS-14CH4 RESISTANCE 1. TYPE OF CAPACITOR SYMBOL RESISTANCE TOLERANCE POWER MOUNTING SYMBOL RESISTANCE TOLERANCE POWER MOUNTING SYMBOL RESISTANCE TOLERANCE POWER MOUNTING FORM FORM FORM M-BOARD F : FILM ±5% ±5% ±5% R301 R352 R701 ±5% ±5% C : CERAMIC R302 ±5%...
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Page 35: Basic Mode
BASIC MODE Operation mode Cooling Sensor dehumidification Heating Automatic Control function Start/stop button, Start/stop button Operation and stop are repeated TEMPERATURE OF INDOOR HEAT basic mode operation lamp independent of timer reservations EXCHANGER THERMISTOR Start/stop button Reservation Cancel OFF timer Operation lamp Timer lamp Timer memory... - Page 36 Operation mode Cooling Sensor dehumidification Heating Automatic Control function • Sleep operation is executed 5 deg down LO (sleep operation) Set circulation velocity for each operation mode. temperature Set circulation Other detailed specifications velocity 60 minutes Table 1 Specifications 2 deg up LO (sleep operation) temperature Start/stop switch...
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Page 40: Service Call Q & A
SERVICE CALL Q & A Cooling operation Check whether frost sticks If cooling is performance While cooling, the com- on the heat exchanger of when the room tem- pressor sometimes stops unit or not. perature is low, frost may abruptly. Wait for 3 - 4 minutes until stick heat... - Page 41 Heating operation It is not a trouble. The fan is When starting the operation, Air does not come out stopped to avoid cold wind. the heat exchanger is cold when starting a heating and, therefore, the fan is operation. stopped. Wait 2–3 minutes.
- Page 42 Automatic operation How is the automatic According to the room operation mode determined? temperature, cooling, heating or dehumidifying operation 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 43 Common, etc. There is a 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, adjust the set temperature to keep living space at a comfortable temperature.
- Page 44 Wireless remote controller 1) When the “Automatic” 1) When the operation mode The room temperature is “Automatic”, the fan sensing thermistor in the operatoin mode speed is automatically fixed indoor unit detects the room selected, “Automatic” does to “Automatic”. temperature and, according not change by pressing to the particular temperature, the fan speed select...
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Page 45: Troubleshooting
TROUBLESHOOTING No cooling or heating – 47 –... - Page 46 [Self diagnosis by indoor indicator lamp] You can locate the cause of trouble from the manner of flashing of the Timer lamp on the indoor unit display. Flashing made of Timer lamp Reasons of indication Check parts 1 time (1) In Heating, total stop when (1) Reversing valve (outdoor) indoor heat exchanger (2) Reversing valve relay...
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Page 47: Parts List And Diagram
PARTS LIST AND DIAGRAM MODEL RAS-14CH4 – 49 –... - Page 48 MODEL RAS-14CH4 PART NO. Q’TY / UNIT PARTS NAME RAS-14CH4 PMRAS-12CH1 CYCLE ASSEMBLY PMRAS-12CH1 FAN MOTOR 10W PMRAS-09C1 TANGENTIAL FLOW FAN PMRAS-05C P-BEARING ASSEMBLY PMRAS-14CH1 CAPACITOR 1µF, 450V PMRAS-07CH2 TERMINAL BOARD (2P) PMRAS-12CH1 CABINET PMRAS-12CH1 DRAIN PAN ASSEMBLY PMRAS-12CH1 FRONT COVER ASSEMBLY...
- Page 49 MODEL RAC-14CH4 – 51 –...
- Page 50 MODEL RAC-14CH4 PART NO. Q’TY / UNIT PARTS NAME RAC-14CH4 PMRC-5142CHV1 COMPRESSOR PMRAC-35CHA1 CONDENSER PMRAC-51CHA1 REVERSING VALVE PMRAC-07CH2 COIL (REVERSING VALVE) PMRAC-5142CV FAN MOTOR PMRAC-13CV6 PROPELLER FAN PMRAC-13C7 CAPACITOR 35µF, 440V PMRAC-13C7 CAPACITOR 2.5µF, 450V PMRAC-12CH1 CABINET PMRAC-5142CV SIDE PLATE (L) PMRAC-5142CV SIDE PLATE (R) PMRAC-5142CV...
- Page 51 PM NO. 0204E RAS-14CH4 / RAC-14CH4 Printed in Malaysia...