Hitachi RAC-18G5 Service Manual Download Page 40 | Manualshive

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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

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Summary of Contents for RAC-18G5

Page 1: ...CITY DIMENSIONS mm NET WEIGHT SPECIFICATIONS 1030 295 207 12 RAS 18G5 CONTENTS SPECIFICATIONS 4 HOW TO USE 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM 26 MAIN PARTS COMPONENT 28 WIRING DIAGRAM 30 CIRCUIT DIAGRAM 31 PRINTED WIRING BOARD LOCATION DIAGRAM 33 BLOCK DIAGRAM 35 BASIC MODE 37 REFRIGERATING CYCLE DIAGRAM 43 DESCRIPTION OF MAIN CIRCUIT OPERATION 44 AUTO SWING FUNCTION 48 SERVICE CALL Q A 49 TRO...

Page 2: ...r use in repairs or inspection should be accurately calibrated in advance 7 In installing the unit having been repaired be careful to prevent the occurence of any accident such as electrical shock leak of current or bodily injury due to the drop of any part 8 To check the insulation of the unit measure the insulation resistance between the power cord plug and grounding terminal of the unit The ins...

Page 3: ...ing of parts Even rejected goods should be handled in the same way Fig 1 Conductive Container 2 When any part is handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing 1M earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a body ...

Page 4: ...the screwed part using a rag plate Soldering iron Grounding wire Fig 4 Grounding a soldering iron Use a high insulation mode 100V 10M or higher when ordinary iron is to be used 7 In checking circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like Metal plate of aluminium stainless steel etc Staple...

Page 5: ...nd the unit will begin or stop operating under a new timer setting 4 If the room air conditioner is stopped by adjusting thermostat or missoperation and re start in a moment there is occasion that the cooling operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or ...

Page 6: ...SSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL FUSE CAPACITY RAS 18G5 30 W NO NO NO NO NO 3 15A G4A YES YES YES YES SWITCHING POWER SUPPLY 450NR NO YES IC YES RAC 18G5 40 W 2 5μF 450V YES INTERNAL ASH210SV C8LU 60μF 450VAC YES INTERNAL YES INTERNAL NO NO NO NO NO NO NO NO NO NO 20 A TIME DELAY FUSE 1410g ADDITIONAL REFRIGERANT R410A AT 15g PER EVERY METER IF PIPE LENGTH MORE THAN 8m UNIT PIP...

Page 7: ...ed with the enclosed insulation pipe If the insulator is insufficient please use commercial products The difference in height between the indoor and outdoor unit should be kept max 10m The connecting pipe no matter big or small should all be insulated with insulation pipe and then wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape The connection of insulated drai...

Page 8: ...page 7 Horizontal deflector Vertical deflector Air Outlet Remote controller Send out operation signal to the indoor unit So as to operate the whole unit Refer Instruction manual OUTDOOR UNIT Drain pipe Condensed water drain to outside Connecting cord and insulation pipe for piping Air inlet Back and Left side Air outlet WIDTH mm 1030 850 MODEL RAS 18G5 RAC 18G5 HEIGHT mm 295 650 DEPTH mm 207 298 M...

Page 9: ...a total of about 200 hours the FILTER lamp lights to indicate that it is time to clean the filter The lamp goes out when the AUTO SWING button is pressed while the device is on STANDBY MODE TEMPORARY SWITCH Use this switch to start and stop when the remote controller does not work By pressing the temporary switch the operation is done in previously set operation mode When the operation is done usi...

Page 10: ... 23 Outdoor Dry bulb C 21 43 Wet bulb C 15 26 Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below 21 C 70 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below ...

Page 11: ...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 Please observe all instructions str...

Page 12: ...ime water will condense on the air deflector and drips down occasionally This will wet your furniture Therefore do not operate under such condition for a long time If the amount of heat in the room is above the cooling capability of the unit for example more people entering the room using heating equipments and etc the preset room temperature cannot be achieved This appliance is not intended for u...

Page 13: ...art operation RESET button STOP button Press this button to stop operation only SLEEP button Use this button to set the sleep timer FAN SPEED selector This determines the fan speed Each time you press this button the intensity of circulation will change from AUTO to HI to MED to LOW AUTO SWING button Controls the angle of the horizontal air deflector TEMPERATURE button Use this button to raise or ...

Page 14: ...utton the display indicates the setting AUTO The FAN SPEED is HI at first and varies to MED or LOW automatically when the preset temperature has been reached HI Hi fan speed mode MED Medium fan speed mode LOW Low fan speed mode Set the desired room temperature with the TEMPERATURE button the display indicates the setting The range of 25 28 C is recommended as the room temperature for cooling If th...

Page 15: ...temperature regardless of the temperature setting The function will stop the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature As the settings are stored in memory in the remote controller you only have to press the DEHUMIDIFY button next time Set the desired room temperature with the TEMPERATURE button the display indicates the setting T...

Page 16: ...control button to set to the desired temperature As the settings are stored in memory in the remote controller you only have to press the CIRCULATION button next time 2 1 3 Press the STOP button to stop operation STOP Circulation Function During circulation operation compressor does not run and there is no cooling operation with only indoor fan running When the setting temperature is higher than r...

Page 17: ...ation will be displayed on the remote controller The TIMER lamp lights with a beep from the indoor unit Cooling and dehumidifying 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...

Page 18: ...w sequence when you press the button OFF Timer Reservation Operation stop at setting time ON TIME setting Select the ON TIMER by pressing the ON Button Setting time will change according to the below sequence ON Timer Reservation Operation will start for setting temperature at setting time The starting time may different depend on the room temperature and set temperature ...

Page 19: ...ditioned air to the left and right Hold the vertical air deflector as shown in the figure and adjust the conditioned air to the left or right If the AUTO SWING button is pressed once the horizontal air deflector swings up and down If the button is pressed again the deflector stops in its current position Several seconds about 6 seconds may be required before the deflector starts to move In Cooling...

Page 20: ...different kinds of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months 3 Use high quality and high performance AAA batteries to avoid short operating life and electrolyte leakages 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 co...

Page 21: ...able room temperature Please use the timer effectively Dusty air filter will reduce the air volume and the cooling efficiency To prevent from wasting electric energy please clean the filter every 2 weeks Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old folks who have difficulty in movement THE IDEAL WAYS OF OPERATION Caution Do n...

Page 22: ...circuit even if it is in OFF mode Interference From Electrical Products Caution To avoid noise interference please place the indoor unit and its remote controller at least 1m away from electrical products Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket Caution If the amount of heat in the room is above the cooling capability of ...

Page 23: ...es Attaching the air purifying filters Attach the air purifying filters to the frame by gently compress its both sides and release after insertion into pre filter frame Do not bend the air purifying filter as it may cause damage to the structure In case of removing the air purifying filters please follow the above procedures The cooling capacity is slightly weakened and the cooling speed becomes s...

Page 24: ... pre filters push the front panel at three arrow portions as shown in figure and close it CAUTION Do not wash with hot water at more than 40 C The filter may shrink When washing it shake off moisture completely and dry it in the shade do not expose it directly to the sun The filter may shrink Do not use detergent on the air purifying filter as some detergent may deteriorate the air purifying filte...

Page 25: ...f the unit when cleaning it as this may cause short circuit Never use hot water above 40 C benzine gasoline acid thinner or a brush because they will damage the plastic surface and the coating Removing the Front Panel When the front panel is fully opened with both hands push the right arm to the inside to release it and while closing the front panel slightly put it out forward Attaching the Front ...

Page 26: ...hould be installed depending on the mounting site of the unit Without a circuit breaker the danger of electric shock exists IMPORTANT The wires in this mains lead are coloured in accordance with the following code Green and yellow Earth Blue Neutral Brown Live As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in ...

Page 27: ...mitted from the room air conditioner because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above inspections Inform your agent of the model of your unit production number date o...

Page 28: ...it 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 3 Piping length is within 15m 4 Height different of the piping between the indoor unit and the outdoor unit should be within 10m 5 Power supply cord length is about 2m 6 Connecting cord 2 5mm2 dia x 3 is used for connection ...

Page 29: ... 27 MODEL RAC 18G5 ...

Page 30: ...DICATION 32 MODEL RAS 18G5 THERMOSTAT MODEL IC OPERATION MODE ON OFF ON OFF ON OFF CONNECTION MODEL RAS 18G5 PHASE RATED VOLTAGE SINGLE RATED FREQUENCY DC100 322V 220 240V OUTPUT POLE NUMBER 6 30 W 40 W 50 Hz RESISTANCE VALUE 20 C 75 C RAC 18G5 COOL 15 6 60 1 15 3 59 5 23 6 74 5 23 3 73 9 31 6 88 9 31 3 88 3 RM 186 0 RA 247 0 RM 226 2 RA 300 4 ...

Page 31: ...CONNECTION 20 C 68 F 75 C 167 F RESISTANCE VALUE 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 If the color has been changed conspicuously replace the compressor EXTERNAL OVERLOAD RELAY INTERNAL PROTECTOR NO YES RM 1 69 RA 1 54 RM 2 06 RA 1 87...

Page 32: ... THERMISTOR C POWER SWITCH N NOISE FILTER U INTERNAL PROTECTOR D THERMAL FUSE FOR 2P TERMINAL 102 C P POWER RELAY V VARISTOR G 60 μF CAPACITOR R SURGE ABSORBER X FUSE H 2 5 μF CAPACITOR Z AUTO SWEEP MOTOR BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET IVO IVORY ...

Page 33: ... 31 CIRCUIT DIAGRAM Remote Control ...

Page 34: ... 33 PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS 18G5 ...

Page 35: ... 35 BLOCK DIAGRAM MODEL RAS 18G5 RAC 18G5 ...

Page 36: ...ng to the thermostat signal Refer to Thermostat operation LO and Stop are repeated according to the thermostat signal independent of the setting Notes Forced operation by ON OFF button ON is executed even with thermostat OFF The room temperature 30 sec after operation start minus 0 66 deg becomes the set temperature When the room temperature is 16 C or lower 16 C becomes the set temperature The ot...

Page 37: ...set temperature after sleep shift in sensor dehumidification operation is limited by 16 C Notes 60 minutes after the sleep key is switched on sleep operation is started When the sleep key is switched on during OFF timer operation the OFF timer will be canceled The sleep operation is started when the sleep key is ON after timer reservation 39 ...

Page 38: ...the temperature difference OT compensation time HT MT is at least 5 minute if OT is not zero Cooling MT 00 60 min OT 00 60 min HT 60 60 min Obtain OT moved up time depending on the temperature difference from the table below 6 NICE TEMPERA TURE reservation Cooling Setting temp Room temp Time min 00 00 02 00 00 02 25 05 00 15 05 25 08 00 30 08 25 11 00 45 11 25 60 The preset temperature value shown...

Page 39: ... 43 REFRIGERATING CYCLE DIAGRAM MODEL RAS 18G5 RAC 18G5 ...

Page 40: ... 44 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 ...

Page 41: ...d DC 5V lines are increased When the voltage of DC 12V lines reaches about 7V ZD202 is turned ON the potential of Q201 s base rises and Q202 is turned ON Since Q202 s collector is set to LO at this time Q202 is turned ON and the reset input of the micro computer is set to Hi The DC 5V line voltage has already become stable at this time and the micro computer starts operation When the power is turn...

Page 42: ...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 Receive circuit Infrared signals from the wireless remote controller are received by the light receiving unit and output after being amplified and shaped ...

Page 43: ...perature 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 The fan speed is Hi Does not operate is 12V is not generated in the control circuit When the service switch is used for operation each change switch is overridden Setting the service switch to Cooling turns on the Power relay SW2 SERVICE S...

Page 44: ...SING AIR DEFLECTOR 1 DOWNWARD 2 UPWARD INITIALIZE 1 DOWNWARD INITIALIZE 1 DOWNWARD 2 UPWARD STOP AT THE MOMENT START SWINGING 1 DOWNWARD 2 UPWARD 3 DOWNWARD STOP AT THE MOMENT START SWINGING 1 DOWNWARD 2 UPWARD 3 DOWNWARD STOP AT THE MOMENT ONE SWING CLOSING AIR DEFLECTOR 1 DOWNWARD 2 UPWARD INITIALIZE AT NEXT OPERATION INITIALIZE AT NEXT OPERATION STOP DURING ONE SWING STOP DURING SWINGING STOP D...

Page 45: ...ared with the room temperature setting when starting the operation and the operation is as follows 1 When actual room temperature room temperature setting The operation is according to the room temperature setting on the remote controller 2 When actual room temperature room temperature setting Regardless of the room temperature setting the temperature is automatically set slightly lower than the r...

Page 46: ...st the set temperature to keep living space at a comfortable temperature A6 Common etc In case of ON timer the operation does not start at a preprogrammed time but a little earlier Q7 Nice temperature reservation The Nice temperature reservation functions The operation starts earlier so the room temperature will be as set at a programmed time The operation starts at most 60 minutes before a prepro...

Page 47: ...2 Varistor Check whether the appearance is blackish or not The resistance must be infinite 2 No cooling Power relay abnormal YES Check the continuity between contacts 3 Power switch 102 C Continuity across If there is no continuity check the electric parts and replace if abnormal 4 Thermal fuse for Terminal board 2 Before checking the varistor detach a terminal NO Operates by setting the service s...

Page 48: ...rce cooling switch at indoor electrical IC 401 Data read wrongly In case that data read from IC401 is wrong IC401 data is not in order Heat exchanger thermistor error Heat exchanger thermistor open or short circuit detected 1 Thermistor 2 Indoor control circuit board Room thermistor error Room thermistor error open or short circuit detected 1 Thermistor 2 Indoor control circuit board 1 2 3 4 5 0 5...

Page 49: ... 53 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS 18G5 22 21 24 18 23 17 16 13 15 14 10 12 11 3 4 5 8 7 6 19 20 2 1 9 ...

Page 50: ...N PAN ASSY 11 PMRAS 18C9 002 1 AUTO SWEEP MOTOR 12 PMRAS 63CA2 R05 1 P W B LED 13 PMRAS 18KHT1 R02 1 FRONT COVER ASSY 14 PMRAS 18KHT1 R03 1 FRONT PANEL 15 PMRAS 10C7M 008 3 CAP 16 PMRAS 51CHA1 R10 2 FILTER 17 PMRAS 10C9G 013 1 REMOTE CONTROL ASSY 18 PMRAS 10C3M 003 1 REMOTE CONTROL SUPPORT 19 PMRAS 51CHA1 R15 1 THERMISTOR SUPPORT 20 PMRAS 70YHA R12 1 THERMISTOR 21 PMRAS 18CP2R R02 1 POWER SWITCH 2...

Page 51: ... 55 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL RAC 18G5 ...

Page 52: ...PMRAC S18CXK 902 1 FAN MOTOR 9 PMRAC 30CH7 905 1 PROPELLER FAN 10 PMRAC 63CA1 S02 1 TERMINAL BOARD 2P 11 PMRAC 63CHA2 S07 1 COMPRESSOR CAPACITOR 12 PMRAC 63CHA2 S08 1 FAN MOTOR CAPACITOR 13 PMRAC 40CNH2 926 1 SIDE PLATE L 14 PMRAC S18CZT S03 1 CABINET 15 PMRAC S18CAK S04 1 SIDE PLATE R 16 PMRAC 24CP5 904 1 NET 17 PMRAC 24CP5 905 1 TOP COVER 18 PMRAC S18CAK S02 1 STRAINER COND 19 PMRAM 52QH5 S03 1 ...

Page 53: ...PM NO 0485E Made in Malaysia RAS 18G5 RAC 18G5 ...

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