Hitachi RAS-10G5 Service Manual
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Hitachi RAS-10G5 Service Manual

Room air conditioner
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SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY
RAS-10G5
RAS-14G5
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

MARCH 2011
RAC-10G5
RAC-14G5
INDOOR UNIT
RAS-10G5
1 PHASE, 50 Hz, 220-230V
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAS-10G5 / RAC-10G5
RAS-14G5 / RAC-14G5
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------ 5
HOW TO USE ---------------------------------------------------------- 8
MAIN PARTS COMPONENT --------------------------------------31
WIRING DIAGRAM ---------------------------------------------------34
CIRCUIT DIAGRAM --------------------------------------------------37
BLOCK DIAGRAM ----------------------------------------------------41
BASIC MODE ----------------------------------------------------------43
REFRIGERATING CYCLE DIAGRAM---------------------------46
AUTO SWING FUNCTION -----------------------------------------55
SERVICE CALL Q & A ----------------------------------------------56
PARTS LIST AND DIAGRAM --------------------------------------60
(WALL TYPE)
OUTDOOR UNIT
RAC-10G5
870-900
4.00-3.95
2.90-2.90
9890-9890
780
700
280
468
220
258
9
25
NO. 0487E
CONTENTS
INDOOR UNIT
OUTDOOR UNIT
RAS-14G5
RAC-14G5
1 PHASE, 50 Hz, 220-230V
1210-1230
5.70-5.50
3.02-3.01
12,460-12,630
780
700
280
468
220
258
9
25

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Summary of Contents for Hitachi RAS-10G5

  • Page 1: Table Of Contents

    NO. 0487E RAS-10G5 / RAC-10G5 RAS-14G5 / RAC-14G5 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ------------------------------------------------------ 5 HOW TO USE ---------------------------------------------------------- 8 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------29 MAIN PARTS COMPONENT --------------------------------------31 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 1M (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  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 recommended to stop the operation and to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Specifications

    SPECIFICATIONS RAS-10G5 RAC-10G5 RAC-14G5 MODEL RAS-14G5 20 W FAN MOTOR 30 W FAN MOTOR CAPACITOR 2.5µF, 450VAC FAN MOTOR PROTECTOR –– COMPRESSOR ASG108CV UG4B124JX COMPRESSOR MOTOR CAPACITOR 35µF, 450 VAC 45µF, 450 VAC OVERLOAD PROTECTOR YES (EXTERNAL) OVERHEAT PROTECTOR YES (EXTERNAL) 3.15A...
  • Page 7 MODEL RAS-10G5 / RAC-10G5 Figure showing the installation of Indoor and Outdoor unit CAUTION In case the pipe length is more than 8m, add refrigerant R410A at 15 gram per every meter exceeds. However, pipe length shall not exceed 15m.
  • Page 8 MODEL RAS-14G5 / RAC-14G5 Figure showing the installation of Indoor and Outdoor unit CAUTION In case the pipe length is more than 8m, add refrigerant R410A at 10 gram per every meter exceeds. However, pipe length shall not exceed 15m. Be sure to completely seal any gap.

  • Page 9: Names And Functions Of Each Part

    (Refer Instruction manual) 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-10G5 / RAS-14G5 RAC-10G5 / RAC-14G5 – 8 –...
  • Page 10 INDOOR UNIT INDICATORS FILTER LAMP When the device is operated for a total of about 200 hours, the FILTER lamp lights to indicate that it is time to clean the fi lter. The lamp goes out when the “ (AUTO SWING)” button is pressed while the device is on “STANDBY MODE”.
  • Page 11 Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness fl uctuation may occur. This is of no consequence. The conditions of the local Power Supply Companies are to be observed. Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below ●...

  • Page 12: 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 13 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. Do not direct the cool air coming out from the air-conditioner panel to face ●...

  • Page 14: Names And Functions Of Remote Control Unit

    NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER This controls the operation of the indoor unit. Signal range to reach indoor unit is about 7 meters. If inverter lamp is used, 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 15: Cooling Operation

    COOLING OPERATION Use the device for cooling when the outdoor temperature is 21 ~ 43°C. If indoors humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit. Press the button so that the display indicates (COOL).

  • Page 16: 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 (DEHUMIDIFY) button. Dehumidifying operation starts with a beep. The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.

  • Page 17: Circulation Operation

    CIRCULATION OPERATION Press the button so that the display indicates (CIRCULATE). Circulating operation starts with a beep. Press the FAN SPEED button and select the desired FAN SPEED (the display indicates your choice). Press the temperature control button to set to the desired temperature.

  • Page 18: Super Cooling

    SUPER COOLING Press the button. Operation start with a signal received sound “beep”. ● Unit will be forced operate in (COOL) with SUPER HI fan ● speed for 20 minutes. Indicator appear during this period while temperature and fan speed setting display remain unchanged.

  • Page 19: How To Set The Sleep Timer

    HOW TO SET THE SLEEP TIMER Press the (SLEEP) button, and the display changes as shown below. Mode Indication 1 hour 2 hours 3 hours 7 hours Sleep timer Sleep timer off Sleep Timer: The device will continue working for the designated number of hours and then turn off.
  • Page 20 ■ ON Timer and OFF Timer are available. ■ Operation stop at setting time OFF Timer Reservation OFF TIME setting ● Select the OFF TIME by pressing the (OFF) Button. ● Setting time will change according to the below sequence when you press the button.

  • Page 21: Adjusting The Air Deflectors

    ADJUSTING THE AIR DEFLECTORS Adjustment of the conditioned air in the upward and downward directions. The horizontal air defl ector is automatically set to the proper angle suitable for each operation. The defl ector can be swung up and down continuously and also set to the desired angle using the “...

  • Page 22: How To Exchange The Batteries In The Remote Controller

    HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER When using the remote control, if there is no response from the air conditioner unit and/or the remote control has fading and dim displays, the batteries in the remote control device need to be removed and replaced with new ones Remove the cover as shown in the fi...
  • Page 23 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible to reduce heat Freezing temperature entering the is bad for health and a room through waste of electric power. windows. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer Caution operation mode”, together with your wake up...
  • Page 24 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 25: Attaching The Air Purifying Filters

    ATTACHING THE AIR PURIFYING FILTERS CAUTION Cleaning and maintenance must be carried out when fi lter lamp lights. 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 26 MAINTENANCE CAUTION Cleaning and maintenance must be carried out when fi lter lamp lights. 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...
  • Page 27 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 28 CAUTION ● Please use earth line. Do not place the earth line near water or gas pipes, lightning-conductor, or the earth line of telephone. Improper installation of earth line may cause electric shock. ● A circuit breaker should be installed depending on the mounting site of the unit. Without a circuit breaker, the danger of electric shock exists.
  • Page 29 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”? ●...

  • Page 30: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-10G5/14G5 Note: 1. Servicing space of 100mm or more is required on the left and right sides of the indoor unit and also 50mm or more space is required above the unit 2. Insulated pipes should be used for both the narrow and wide dia. pipes.
  • Page 31 MODEL RAC-10G5 / RAC-14G5 – 30 –...

  • Page 32: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Specifi cations MODEL RAS-10G5/14G5 THERMOSTAT MODEL OPERATION COOL 17.3 (63.1) INDICATION 16.7 (62.1) 25.3 (77.5) INDICATION TEMPERATURE °C (°F) 24.7 (76.5) 33.3 (91.9) INDICATION 32.7 (90.9) FAN MOTOR Fan Motor Specifi cations...
  • Page 33 COMPRESSOR MOTOR Compressor Motor Specifi cations MODEL RAC-10G5 COMPRESSOR MODEL ASG108CV-B7AT PHASE SINGLE RATED VOLTAGE 220 – 240 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 18 A POLE NUMBER CONNECTION 20°C RM = 3.75 (68°F) RA = 3.34 RESISTANCE VALUE 75°C RM = 4.56 (167°F)
  • Page 34 COMPRESSOR MOTOR Compressor Motor Specifi cations MODEL RAC-14G5 COMPRESSOR MODEL UG4B124JX PHASE SINGLE RATED VOLTAGE 220 – 240 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 27 A POLE NUMBER CONNECTION 20°C RM = 3.08 (68°F) RS = 2.81 RESISTANCE VALUE RM = 3.75 75°C RS = 3.42...
  • Page 35 – 34 –...
  • Page 36 – 35 –...

  • Page 37: Circuit Diagram

    CIRCUIT DIAGRAM Remote Control – 37 –...

  • Page 38: Printed Wiring Board Location Diagram

    PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS-10G5/14G5 RAC-10G5/14G5 – 39 –...
  • Page 39 – 41 –...

  • Page 40: Basic Mode

    BASIC MODE MODEL RAS-10G5/14G5 // RAC-10G5/14G5 Operation mode Operation mode Cooling Sensor dehumidi cation Cooling Sensor dehumidi cation Control function Control function Start/stop button, basic mode OFF timer The set temperature after sleep shift in sensor dehumidi cation operation is limited by 16°C.
  • Page 41 Operation starts in advance so that the room temperature reaches the preset value at ● the set time. The operation time is obtained as follows depending on the room temperature when ● operation starts. (1) Calculation method of the moved-up time. Moved-up time (MT) = Moved-up time depending on the temperature difference (OT) + compensation time (HT).

  • Page 42: Refrigerant Cycle Diagram

    REFRIGERANT CYCLE DIAGRAM MODEL RAS-10G5/RAC-10G5 RAS-14G5/RAC-14G5 – 46 –...

  • 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. Fig. 1-1 Timer operation – 47 –...
  • Page 44 2. Reset Circuit 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. The micro computer is reset when the reset input is “Lo”, and operation is possible when the reset input is ●...
  • Page 45 3. Buzzer Circuit Fig. 3-1 Buzzer Circuit When the buzzer sounds, an approx. ● 3.9kHz square signal is output from buzzer output pin of the micro computer. After the amplitude of this signal has been set to 12Vp-p by a transistor, it is applied to the buzzer.
  • Page 46 5. Receive circuit Infrared signals from the wireless remote controller are received by the light receiving unit and output after being amplifi ed and shaped. 6. Service Operation Circuit Use the service switch to select “Cooling” temporarily when the interior electric equipment has troubled. ●...
  • Page 47 7. Auto Sweep Motor Circuit Fig. 7-1 Auto Sweep Motor Circuit (Horizontal air defl ectors) Fig. 7-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 7-2 are output from pins ● – of the micro computer. Fig.
  • Page 48 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. 9. Heat exchanger temperature thermistor circuit The circuit detects the indoor heat ●...
  • Page 49 10. Temporary Switch Fig. 10-1 The temporary switch is used to operate the air conditoner 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 50 – 54 –...
  • Page 51 – 55 –...

  • Page 52: Service Call Q

    SERVICE CALL Q & A Cooling operation While cooling, the compressor Check whether frost sticks on If cooling is performance sometimes stops abruptly. the heat exchanger of indoor when the room temperature unit or not. is low, frost may stick on the heat exchanger of indoor Wait for 3 –...
  • Page 53 Common, etc. There is a difference between There may be a difference the room temperature setting b e t w e e n t h e r o o m and actual room temperature. temperature setting and actual room temperature on account of the room structure, air fl...
  • Page 54 380V) at out put side of the DB1? of control board *4 Wait for 3 minutes before forced Replace control P.W.B. re-operation by the service switch. Replace faulty part CN5 BLUE-RED (V) RAS-10G5 RAS-14G5 RAC-10G5 RAC-14G5 Fan Speed Cool Cool 23.0...
  • Page 55 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 Force cooling operation Check force cooling switch at indoor electrical. Unit is under forcible operation –...

  • Page 56: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAS-10G5/14G5 – 60 –...
  • Page 57 MODEL RAS-10G5 PART N0. Q’TY / UNIT PARTS NAME RAS-10G5 PMRAS-S10CYT R07 CABINET PMRAS-25YH4 MOUNTING PLATE PMRAS-07GH4 FAN MOTOR PMRAS-260GA TANGENTIAL FAN PMRAS-25YH4 P-BEARING ASSY PMRAS-10CYT FAN MOTOR BASE PMRAS-S10CYK R02 CYCLE ASSY PMRAS-25YH4 BEARING COVER PMRAS-S13CY PIPE SUPPORT PMRAS-S10CY...
  • Page 58 MODEL RAS-14G5 PART N0. Q’TY / UNIT PARTS NAME RAS-14G5 PMRAS-08CH8 CABINET PMRAS-25YH4 MOUNTING PLATE PMRAS-07GH4 FAN MOTOR PMRAS-260GA TANGENTIAL FAN PMRAS-25YH4 P-BEARING ASSY PMRAS-10CYT FAN MOTOR BASE PMRAS-S13CYK R02 CYCLE ASSY PMRAS-25YH4 BEARING COVER PMRAS-S13CY PIPE SUPPORT PMRAS-S10CY DRAIN PAN ASSY PMRAS-25YH4 AUTO SWEEP MOTOR PMRAS-S10CYT R05...
  • Page 59 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-10G5/14G5 – 63 –...
  • Page 60 MODEL RAC-10G5 PART N0. Q’TY / UNIT PARTS NAME RAC-10G5 PMRAC-13C7 FAN MOTOR CAPACITOR PMRAC-13C7 COMPRESSOR CAPACITOR PMRAC-63CA1 TERMINAL BOARD (2P) PMRAC-X10CZ 3S-VALVE PMRAC-X13CX 2S-VALVE PMRAC-E10CZ FAN MOTOR SUPPORT PMRAC-S13CX FAN MOTOR PMRAC-X10CZ PROPELLER FAN PMRAC-S10CAK SIDE PLATE (R) PMRAC-X10CZ CONDENSER PMRAC-X10CZ STRAINER (PIPE)
  • Page 61 MODEL RAC-14G5 PART N0. Q’TY / UNIT PARTS NAME RAC-14G5 PMRAC-13C7 FAN MOTOR CAPACITOR PMRAC-24GH4 COMPRESSOR CAPACITOR PMRAC-63CA1 TERMINAL BOARD (2P) PMRAC-S13CAK 4S-VALVE PMRAC-X13CX 2S-VALVE PMRAC-E10CZ FAN MOTOR SUPPORT PMRAC-S13CX FAN MOTOR PMRAC-X10CZ PROPELLER FAN PMRAC-S10CAK SIDE PLATE (R) PMRAC-X10CZ CONDENSER PMRAC-X10CZ STRAINER (PIPE)
  • Page 62 HITACHI RAS-10G5 / RAC-10G5 PM NO. 0487E RAS-14G5 / RAC-14G5 Printed in Malaysia...

This manual is also suitable for:

Ras-14g5Rac-14g5Rac-10g5

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