Hitachi RAC-70YH7A Service Manual Download Page 55

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8. Temporary Switch

●

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.

Fig. 8-1

9. Indoor Fan Motor Feedback Circuit

●

Fan

motor will receive signal thru Joint Connector with VDC (Motor Drive Voltage), VCC (Motor Controller

Power Supply), VSC (RPM Instruction) motor WCC return the FG sinal under frequency RPM.

●

The circuit produces fan motor drive from 340V DC supplied from the indoor unit and controls the fan

motor speed.

CAUTION 1

Indoor fan motor circuit will be connected with primary
power source line and please take care of the electrical
shock.

CAUTION 2

Please do not disconnect the fan motor connector during
running due to the high voltage supply, it will cause the
damage at fan motor and PWB.

●

<Exp. of circuit wave>

Fig. 9-1

Fig. 9-2

Summary of Contents for RAC-70YH7A

Page 1: ...D WIRING BOARD LOCATION DIAGRAM 41 BLOCK DIAGRAM 44 BASIC MODE 45 REFRIGERATING CYCLE DIAGRAM 59 DESCRIPTION OF MAIN CIRCUIT OPERATION 61 SERVICE CALL Q A 74 TROUBLE SHOOTING 78 PARTS LIST AND DIAGRAM 98 RAS 70YH7 RAC 70YH7A After installation RAC 70YH7A W A kW B T U h W A kW B T U h W H D kg WALL TYPE TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES CAPACITY TOTAL INPUT TOTAL AMPERES CAPACITY DI...

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: ... or missoperation and re start in a moment there is occasion that the cooling and heating 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 damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the coolin...

Page 6: ...RY SWITCH TEST SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL FUSE CAPACITY RAS 70YH7 30 W NO NO NO NO NO 3 15A G4A NO YES NO NO 416NR NO YES IC YES NO NO JU1015D9 NO YES INTERNAL YES 3 15A G4A NO NO YES NO 450NR NO YES IC NO 30 A TIME DELAY FUSE 1850g UNIT REFRIGERANT CHARGING VOLUME Refrigerant R410A CHARGELESS PIPES MAX 30m PIPES MIN 3m RAC ...

Page 7: ...l 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 drain hose Please use insulated drain hose for the indoor piping commercial product The indoor piping should be insulated with the enclosed insulation pipe If the insulator is insufficient please use commercial products ...

Page 8: ...AC 70YH7A HEIGHT mm 333 800 DEPTH mm 245 298 MODEL NAME AND DIMENSIONS OUTDOOR UNIT DRAIN PIPE Condensed water drain to outside CONNECTING CORD AIR INLET BACK LEFT SIDE AIR OUTLET Air cleansing filters are not washable and can be use in 1 year time Type number for this air cleansing filter is SPX CFH12 Please use this number for ordering when you want to renew it Air cleansing filter should be cle...

Page 9: ...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 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 Use non conductor stick example toothpick By pressing the temporary switch...

Page 10: ...2 19 Outdoor Dry bulb C 21 43 2 21 Wet bulb C 15 26 1 15 Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below 10 C 14 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below Cooling Heating ...

Page 11: ...ur if you remove and reinstall the unit yourself improperly If the supply cord is damaged it must be replaced by the special cord obtainable at authorized service parts centers W A R N I N G During thunder storm disconnect and turn off the circuit breaker WARNING PRECAUTIONS DURING INSTALLATION Do not reconstruct the unit Water leakage fault short circuit or fire may occur if you reconstruct the u...

Page 12: ...ter 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 or heating 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 ...

Page 13: ...mer OFF TIMER button Select the turn OFF time ON TIMER button Select the turn ON time RESERVE button Time setting reservation CANCEL button Cancel time reservation 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 fixtu...

Page 14: ... type outdoor unit As the settings are stored in memory in the remote controller you only have to press the START STOP button next time Press the FUNCTION selector so that the display indicates the AUTO mode of operation When AUTO has been selected the device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the current room temperature However the mode of ope...

Page 15: ...d ultra slower Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary somewhat depending on conditions Press the START STOP button Heating operation starts with a beep Press the button again to stop operation As the settings are stored in memory in the remote controller you only have to press ...

Page 16: ...top the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature The preset room temperature may not be reached depending on the number of people present in the room or other room conditions Set the desired room temperature with the TEMPERATURE button the display indicates the setting The range of 20 26 C is recommended as the room temperature f...

Page 17: ...W Fan speed slower SILENT Fan speed ultra slower Set the desired room temperature with the TEMPERATURE button the display indicates the setting The temperature setting and the actual room temperature may vary some how depending on conditions Press the START STOP button Cooling operation starts with a beep Press the button again to stop operation The cooling function does not start if the temperatu...

Page 18: ...ain to stop operation START STOP 1 2 For the heating operation When the difference of room temperature and setting temperature is large fan starts to run at HI speed After room temperature reaches the preset temperature the heating operation which changes the fan speed and room temperature to obtain optimum conditions for natural healthful heating will be performed When the difference of room temp...

Page 19: ...lete Example The current time is 1 30 p m 3 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The OFF mark starts lighting instead of flashing and the sign RESERVED lights A beep occurs and the TIMER lamp lights on the indoor unit 2 Set the turn off time with the TIMER control button The setting of turn off time is now complete Example The device ...

Page 20: ...ts and the ON mark blinks NOTE You can set only one of the OFF timer ON timer and ON OFF timer 4 Set the turn on time with the TIMER control button 5 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The ON mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit Example The d...

Page 21: ...on the remote controller The TIMER lamp lights with a beep from the indoor unit When the sleep timer has been set the display indicates the turn off time Example If you set 3 hours sleep time at 11 38 p m the turn off time is 2 38 a m 2Press the SLEEP button and set the sleep timer The device will be turned off by the sleep timer and turned on by on timer How to Cancel Reservation Point the signal...

Page 22: ...r 2 Take out the batteries when you do not use the remote controller for 2 or 3 months CAUTION CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF TEMPORARY SWITCH If the remote controller does not work due to battery failure press this switch to start and stop operation This temporary operation will be at the setting made most recently The unit will immedia...

Page 23: ...mer operation mode together with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Dusty pre 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...

Page 24: ...e used for a long period of time please switch off the power from the mains If the power from mains remains ON the indoor unit still consumes about 8W in the operation control circuit even if it is in OFF mode Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket Interference From Electrical Products Caution To avoid noise interferenc...

Page 25: ...rs push the front panel at three arrow portion as shown in figure and close it Cleaning and maintenance must be carried out only by qualified service personnel Before cleaning stop operation and switch off the power supply CAUTION CAUTION Do not bend the air purifying filter as it may cause damage to the structure NOTE Claws 4 places 1 2 3 4 In case of removing the air purifying filters please fol...

Page 26: ...front and slot them into the original state After attaching the 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 pre 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 pre filter may shrink Do not use detergent on the air pur...

Page 27: ...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 Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it causes trouble Method of removing the front panel Be sure to hold the front panel with both hands to detach and attach it When the front panel is fully opened with both han...

Page 28: ...ble Is the plug of power line firmly plugged into the socket Please ensure no loose contact between them Cleaning and maintenance must be carried out only by qualified service personnel Before cleaning stop operation and switch off the power supply CAUTION 3 MAINTENANCE BEFORE LONG OFF PERIOD Confirm Air Blow Run the unit by setting the operation mode to COOL the temperature to 32 C and the fan sp...

Page 29: ...because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the pre 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 of installation Please also inform him...

Page 30: ...3 Piping length is within 30m 4 Height different of the piping between the indoor unit and the outdoor unit should be within 20m 5 Power supply cord length is about 2m 6 Connecting cable 2 5mm dia x 3 AB Line 1 6mm dia x 2 CD Line is used for the connection About 380 Viewed from back bottom direction pipe lead out MODEL RAS 70YH7 When piping is drawn horizontally exchange the drain hose for the dr...

Page 31: ... 30 MODEL RAC 70YH7A ...

Page 32: ... 0 68 0 OFF 15 3 59 5 20 7 69 3 ON 23 6 74 5 28 0 82 4 OFF 23 3 73 9 28 7 83 7 ON 31 6 88 9 36 0 96 8 OFF 31 3 88 3 36 7 98 1 MODEL RAS 70YH7 POWER SOURCE DC 100 322V OUTPUT 30W Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET COIL MODEL RAC 70YH7A POWER SOURCE DC 120 380V OUTPUT W MAX 47 OUTDOOR FAN MOTOR Fan Moto...

Page 33: ...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 MODEL COMPRESSOR MODEL PHASE SINGLE RATED VOLTAGE AC 220 240 V RATED FREQUENCY 50 60 Hz POLE NUMBER 4 CONNECTION 20 C 68 F 75 C 167 F RESISTANCE VALUE RAC 70YH7A JU1015D9 2M 1 2984 2M 1 7671 ...

Page 34: ... 33 WIRING DIAGRAM MODEL RAS 70YH7 RAC 70YH7A 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 35: ... 35 CIRCUIT DIAGRAM Remote Control ...

Page 36: ... 37 CIRCUIT DIAGRAM MODEL RAS 70YH7 ...

Page 37: ... 39 CIRCUIT DIAGRAM MODEL RAC 70YH7A ...

Page 38: ... 41 PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS 70YH7 MAIN P W B Marking on P W B COMPONENT SIDE SOLDERING SIDE RECEIVING P W B Marking on P W B ...

Page 39: ... 42 MODEL RAC 70YH7A P W B MAIN ...

Page 40: ... 43 P W B IPM BOARD P W B CAPA BOARD ...

Page 41: ... 44 BLOCK DIAGRAM MODEL RAS 70YH7 RAC 70YH7A ...

Page 42: ... 45 ...

Page 43: ...CKYMAX 4000 min 1 CJKMAX 4000 min 1 CBEMAX 2300 min 1 WMIN 1200 min 1 CMIN 1200 min 1 STARTMC 60 Seconds DWNRATEW 100 DWNRATEC 100 SHIFTW 0 00 C SHIFTC 1 00 C CLMXTP 30 00 C YNEOF 25 00 C TEION 2 00 C TEIOF 9 00 C SFTDSW 0 66 C DFTIM_OTP0 50 Minutes DFTIM_OTP10 50 Minutes DFTIM_OTP5 60 Minutes STARCPL 1600 min 1 RAS 70YH7 5700 min 1 ...

Page 44: ...MAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor tem perature is higher than CLMXTP 6 When fan is set to Hi compressor rpm will be limited to CKYMAX 7 When fan is set to Med compressor rpm will be limited to CJKMAX 8 When fan is set to Lo compressor rpm will be limited to CBEMAX 9 During Cool Dashed when room temperature reaches set temperatur...

Page 45: ...own to the initial set temperature is made at a rate of 0 33 C 5 min 6 If the operation mode is changed during sleep operation the set temperature is cleared and shift starts from the point when switching is made 7 The indoor fan speed does not change even when the fan speed mode is changed 8 When operation is stopped during sleep operation the set temperature when stopped as well as the time cont...

Page 46: ... 53 ...

Page 47: ...mode starts it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNEOF 0 33 C 8 When fan is set to Med or Lo compressor rpm will be limited to WBEMAX 9 In Ultra Lo fan mode if indoor temperature is lower than 18 C indoor fan will stop If indoor temperature is higher than 18 C 0 33 C fan will continue in Ultra Lo mode During Hotkeep or Defrost mode fan will continue in...

Page 48: ... 57 ...

Page 49: ... 59 REFRIGERATING CYCLE DIAGRAM MODEL RAS 70YH7 RAC 70YH7A ...

Page 50: ...ACH MODE ONE SWING CLOSING 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 ...

Page 51: ...V VHW WR Rµ DW WKLV WLPH 4 LV WXUQHG 2 DQG WKH UHVHW LQSXW RI WKH PLFUR FRPSXWHU LV VHW WR Rµ 7KHQ WKH YROWDJH RI 9 OLQH DQG 9 OLQH DUH LQFUHDVH KHQ WKH YROWDJH RI 9 OLQHV UHDFKHV DERXW 9 LV WXUQ 21 7KH SRWHQWLDO RI 4 ҋV EDVH ULVHV DQG 4 LV WXUQHG 21 7KH 9 OLQH YROWDJH DOUHDG VWDEOH DW WKLV WLPH DQG DQG WKH PLFUR FRPSXWHU VWDUWV RSHUDWLRQV KHQ WKH SRZHU LV WXUQHG 2 WKH YROWDJH RI WKH 9 OLQH GHFUHD...

Page 52: ... frequency is applied to the buzzer and the diaphragm of the buzzer vibrates to output 4kHz sound 3 Initial setting IC401 The pre heating operation start value ratings of the compressor maximum rotation speed etc are preset in the micro computer 4 Receive circuit Infrared signals from the wireless remote controller are received by the light receiving unit and output after being amplified and shape...

Page 53: ...utput from pins of the micro computer Fig 5 2 Micro computer Output Signals As the micro computer s outputs change as shown in Fig 5 2 the core of the auto sweep motor is excited to turn the rotor Table 5 1 shows the rotation angle of horizontal air deflectors Rotation angle per step 0 0879 Time per step ms 10 Horizontal air deflectors Table 5 1 Auto sweep Motor Rotation 15 18 ...

Page 54: ...e thermistor circuit The voltage at A depends on the room temperature as shown in Fig 6 2 The circuit detects the indoor heat exchanger temperature and controls the following 1 Low temperature defrosting during cooling and dehumidifying operation The voltage at A depends on the heat exchanger temperature as shown in Fig 7 2 ...

Page 55: ...hru Joint Connector with VDC Motor Drive Voltage VCC Motor Controller Power Supply VSC RPM Instruction motor WCC return the FG sinal under frequency RPM The circuit produces fan motor drive from 340V DC supplied from the indoor unit and controls the fan motor speed CAUTION 1 Indoor fan motor circuit will be connected with primary power source line and please take care of the electrical shock CAUTI...

Page 56: ... 66 ...

Page 57: ... 67 ...

Page 58: ... 68 ...

Page 59: ... 69 9ROWDJH EHWZHHQ SLQ DQG 1 ...

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Page 64: ... 74 SERVICE CALL Q A 22 1 02 80 1 02 7 1 02 ...

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Page 68: ... 78 TROUBLE SHOOTING ...

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Page 73: ...or IC402 data reading error When data read from IC401 or IC402 is incorrect 1 Reversing valve defective 2 Heat exchanger thermistor dis connected only in the heating mode Note The malfunction mode is entered the 3rd time this abnormal indication ap pears read every 3 minutes Electrical parts in the outdoor unit 1 Indoor interface circuit 2 Outdoor interface circuit Please check at the outdoor elec...

Page 74: ... 84 1 Power does not come on no operation CHECKING INDOOR UNIT ELECTRICAL PARTS ...

Page 75: ... 85 ...

Page 76: ...nly indoor fan does not operate other is normal 4 Air deflector does not move others are normal 5 All systems stop from several seconds to several minutes after operation is started all indicators are also off ...

Page 77: ... 87 6 Check the main P W B power circuit ...

Page 78: ... 88 ...

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Page 82: ...in power supply continuously ON outdoor microcomputer will keep showing diagnosis result LD303 will ON and LD301 will blinks Case 2 If main power supply OFF at once then switch ON again a Outdoor microcomputer will wait the self check command by pressing test service switch within 3 minutes LD302 blinks 1 time If test service signal input is not received unit will return to normal operation mode a...

Page 83: ... 93 ...

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Page 85: ... 95 ...

Page 86: ... 96 CHECKING THE REMOTE CONTROLLER ...

Page 87: ... 97 ...

Page 88: ... 98 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS 70YH7 ...

Page 89: ... R01 4 AUTO SWEEP MOTOR 12 PMRAS 70YH7 R04 1 P W B LED 13 PMRAS 80YH5 003 1 FRONT COVER ASSY 14 PMRAS 80YH5 002 1 FRONT PANEL 15 PMRAS 10C7M 008 3 CAP 16 PMRAS 72CHA3 009 1 FILTER R 17 PMRAS 70YH7 R02 1 REMOTE CONTROL ASSY 18 PMRAS 10C3M 003 1 REMOTE CONTROL SUPPORT 19 PMRAS 72CHA3 008 1 FILTER L 20 PMRAS 72CHA3 R22 1 THERMISTOR 21 PMRAS 70YHA1 006 1 S COVER R 22 PMRAS 70YH7 R01 1 P W B MAIN 23 SV...

Page 90: ... 100 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL RAC 70YH7A ...

Page 91: ... S01 1 P W B MAIN 16 PMRAC 50YH7A S02 1 P W B IPM 17 PMRAS 25NH4 S13 1 TERMINAL BOARD 4P 18 PMRAM 72Q8 S03 1 THERMISTOR OUTSIDE TEMPERATURE 19 PMRAC 70YHA 907 1 PROPELLER FAN 20 PMRAC 70YHA S12 1 SUPPORT FAN MOTOR 21 PMRAC 70YHA2 S05 1 FAN MOTOR 22 PMRAC 70YHA S01 1 CABINET 23 PMRAC 70YHA S06 1 NET 24 PMRAC 24CP5 905 1 TOP COVER 25 PMRAC 70YHA S09 1 SIDE PLATE R 26 PMRAC 70YHA2 S04 1 STRAINER COND...

Page 92: ...PM NO 0509E Printed in Malaysia RAS 70YH7 RAC 70YH7A ...

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