Hitachi RAS-18GH5 Service Manual

Hitachi air conditioners

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Instruction manual (210 pages)

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Page 1: Table Of Contents
NO. 0479E RAS-18GH5/RAC-18GH5 SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS ----------------------------------------------------- 5 HOW TO USE ---------------------------------------------------------- 9 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------30 MAIN PARTS COMPONENT --------------------------------------32 WIRING DIAGRAM ---------------------------------------------------34 CIRCUIT DIAGRAM --------------------------------------------------35...
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 ef- fected 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 rela- tive 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 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 recommended to stop the operation and to disconnect the power cord plug from the power outlet for safety.
Page 6: Specifications
SPECIFICATIONS MODEL RAS-18GH5 RAC-18GH5 FAN MOTOR 30 W 40 W FAN MOTOR CAPACITOR 2.5 F,450V FAN MOTOR PROTECTOR YES (INTERNAL) – COMPRESSOR 5KS205DAA COMPRESSOR MOTOR CAPACITOR 50 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 Figure showing the Installation of Indoor and Outdoor Unit. Be sure to completely seal any gap with putty.
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 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: Names And Functions Of Each Part
OUTDOOR UNIT Drain pipe Condensed water drain to outside. Connecting cord and insulation pipe for piping Air inlet (Back and Left side) Air outlet MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAS-18GH5 1030 RAC-18GH5 – 9 –...
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
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: 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. ●...
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
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 19: How To Set The Timer
HOW TO SET THE TIMER Time, Day, Month Set the current month and TIME, DAY, After you change the day with the TIMER control MONTH batteries; button. (current time, day, month) OFF TIMER ON TIMER OFF-Timer Press the (OFF-TIMER) button. The (OFF) mark blinks RESERVE on the display.
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 ﬂ ashing. ● 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
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
ADJUSTING THE AIR DEFLECTOR 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 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
HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER Remove the cover as shown in the ﬁ gure 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: Suitable Room Temperature
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 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 Purifying Filters
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 ●...
Page 27 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. 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 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 qualiﬁ ed 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 ●...
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”? ●...
Page 31: Construction And Dimensional Diagram
CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-18GH5 1019 Top air suction grille 1030 Front cover Vertical deflector Horizontal deflector Discharge grille 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-18GH5 Note: 1. 200mm or more servicing space is required above the outdoor unit. – 31 –...
Page 33: Main Parts Component
MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Speciﬁ cations MODEL RAS-18GH5 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 Speciﬁ cations MODEL RAC-18GH5 COMPRESSOR MODEL 5KS205DAA PHASE SINGLE RATED VOLTAGE 220 ~ 230 V RATED FREQUENCY 50 Hz LOCKED ROTOR CURRENT 26.0 ~ 28.0 POLE NUMBER WHITE PROTECTOR ORANGE CONNECTION CAPACITOR 20°C RM = 1.780 (68°F) RA = 2.175 RESISTANCE VALUE...
Page 35 – 34 –...
Page 36: Circuit Diagram
CIRCUIT DIAGRAM Remote Control – 35 –...
Page 37: Printed Wiring Board Location Diagram
PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS-18GH5 M-BOARD RESISTOR TERMINAL BOARD POWER-SW POWER RELAY 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 –...
Page 39: Basic Mode
BASIC MODE MODEL RAS-18GH5/RAC-18GH5 Operation mode Cooling Sensor dehumidiﬁ cation Heating Automatic Control function Start/stop button, basic mode OFF timer Timer ON timer operation OFF → ON timer AIR BLOW CHANGE TO "H" FORCILY WHEN ENTERING "PD CUT 2" • “HI”, “MED”, or “LO” operation is executed AIR BLOW CAN BE CHANGED BY REMOTE CONTROL AFTER TEMP.
Page 40 Operation mode Cooling Sensor dehumidiﬁ cation Heating Automatic Control function • Sleep operation is executed for each operation mode. Table 1 Speciﬁ cations Other detailed speciﬁ cations When operation by nice temperature When the room temperature rises Item reservation is executed during sleep within 3 minutes after thermostat OFF Automatic Operation switching...
Page 41 When the room temperature < Set value + compensation shift 1°C, it is regarded to be “Not attained” and 5 minutes are added Table 2 Sensor operation values to the compensation time. Item RAS-18GH5 (Cooling) 17.6 ON temperature Cooling, sensor When the room temperature >...
Page 42: Refrigerating Cycle Diagram
REFRIGERATING CYCLE DIAGRAM MODEL RAS-18GH5/RAC-18GH5 – 47 –...
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 – 48 –...
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 “Hi”, and operation is possible when the reset input is ●...
Page 45 3. Buzzer Circuit 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. 4.
Page 46 6. Service Operation Circuit 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. To protect the compressor, wait at least 3 minutes before turning on again.
Page 47 – 52 –...
Page 48: Service Call Q
SERVICE CALL Q & A Cooling operation W h i l e c o o l i n g , t h e Check whether frost sticks If cooling is performance compressor sometimes stops on the heat exchanger of when the room tempera- abruptly.
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 According to the room H o w i s t h e a u t o m a t i c 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.
Page 51 Common, etc. T h e r e i s a d i f f e r e n c e There may be a difference b e t w e e n t h e r o o m b e t w e e n t h e r o o m temperature setting and...
Page 52 Wireless remote controller 1) When the “Automatic” 1) When the operation mode T h e r o o m t e m p e r a t u r e o p e r a t i o n m o d e is “Automatic”, the fan sensing thermistor in the selected, “Automatic”...
Page 53 In spite of timer Isn’t the time over the pre- programmed time? “Preprogram”, the time As soon as the setting is extinguished. preprogrammed time is reached, the time setting disappears. After selecting a At a “Dehumidifying” “Dehumidifying” operation operation, the “LO” fan mode, the fan speed mode speed”...
Page 54: Trouble Shooting
TROUBLE-SHOOTING No cooling or heating *1 Before using the service switch, disengage No operation at all. and engage the plug. Do not operate the Operates by setting the service 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 re- Check the circuit board inside parts. operation by the service switch. Replace faulty part When checking, carry out a self diagnosis by indoor indicator lamp. CN6 BLUE-RED (V) Fan Speed RAS-18GH5 Cooling Heating 30.0 30.0 26.0 24.0 22.0 21.5...
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-18GH5 – 62 –...
Page 58 MODEL RAS-18GH5 PART N0. Q’TY / UNIT PARTS NAME RAS-18GH5 PMRAS-18GH4 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-18GH4 CYCLE ASSY PMRAS-51CHA1 020 FAN COVER...
Page 59 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-18GH5 – 64 –...
Page 60 MODEL RAC-18GH5 PART N0. Q’TY / UNIT PARTS NAME RAC-18GH5 PMRAC-50NH4 SV. COVER PMRAC-18GH4 COMPRESSOR PMRAC-18GH4 COMPRESSOR RUBBER PMRAC-50NHA VALVE (2S) PMRAC-18GH4 VALVE (4S) PMRAC-51CHA1 902 CONDENSER PMRAC-40CNH2 918 FAN MOTOR SUPPORT PMRAC-18CH1 FAN MOTOR PMRAC-40CNH2 917 PROPELLER FAN PMRAC-51CHA1 903 TERMINAL BOARD (4P) PMRAC-63CHA2 907 COMPRESSOR CAPACITOR...
Page 61 PM NO. 0479E RAS-18GH5 / RAC-18GH5 Printed in Malaysia...

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