Hitachi RAC-70YH7 Service Manual Download Page 72

Page: 72 / 92

– 82 –

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE

Does the timer lamp on the indoor unit blink?

Is the compressor in the outdoor unit operating?

Does the operation lamp on the indoor unit

start to light or blink?

Remove the outdoor unit cover and
electrical parts cover, and check
self-diagnosis lamp LD301

Does LD301 blink one time ?
* Repeats 0.25-second on and
2-second off.

Blinking other than
one time

One-time blinking

Yes

Normal

Timer
lamp

Press the service switch for 1 sec.

Does the compressor operate?

(After checking, be sure to press

the service switch to stop the

operation).

Check the refrigerating cycle.

Check the outdoor electrical parts.

Check the indoor electrical parts.

Check to see whether the F-
cable is connected incorrectly
or disconnected

See Out door unit self-diagnosis lamp
lighting mode .

See Troubleshooting when the timer lamp
blinks .

Is approx. DC 33 to 37V being generated? Is the

polarity correct?

Remove the terminal cover and check the voltage
between terminal (C) and terminal (D)

Terminal C

Terminal A

Terminal B

(+35V)

Terminal D

(0V)

Summary of Contents for RAC-70YH7

Page 1: ...PRINTED 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 70YH7 After installation RAC 70YH7 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 CAPACIT...

Page 2: ... 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 insulation resistance should be 1M or mo...

Page 3: ...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 one M ohm 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 bo...

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: ...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 cooling operation when t...

Page 6: ...TEMPORARY 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 NO YES NO 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 70YH7 ...

Page 7: ...oor and outdoor unit should be kept max 20m 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 drain hose Please use insulated drain hose for the indoor piping commercial product The indoor piping should be insulated with the enclosed insul...

Page 8: ...m 1150 850 MODEL RAS 70YH7 RAC 70YH7 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 cle...

Page 9: ...eat exchanger of the outdoor unit for 5 10 minutes each time 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 condu...

Page 10: ...23 12 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: ...r of electric shock exists Do not install near location where there is flammable gas The outdoor unit may catch fire if flammable gas leaks around it Please ensure smooth flow of water when installing the drain hose CAUTION PRECAUTIONS DURING OPERATION Avoid an extended period of direct air flow for your health W A R N I N G Do not insert a finger a rod or other objects into the air outlet or inle...

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: ...lower the temperature setting Keep pressed and the value will change more quickly TIME button Use this button to set and check the time and date RESET buttons FUNCTION selector Use this button to select the operating mode Every time you press it the mode will change from AUTO to HEAT to DEHUMIDIFY to COOL and to FAN cyclically FAN SPEED selector This determines the fan speed Every time you press t...

Page 14: ...Timer mode is set 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 oper...

Page 15: ...wer 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 the START S...

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: ...OW 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 temperat...

Page 18: ...starts to run at HI speed After room temperature reaches the preset temperature the cooling operation which changes the fan speed and room temperature to obtain optimum conditions for natural healthful cooling will be performed For the cooling 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 Pre...

Page 19: ...ler toward the indoor unit and press the CANCEL button The RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit 1 Set the TIME button 1 Press the OFF TIMER button The OFF mark blinks on the display 1 Press the ON TIMER button the ON mark blinks on the display 2 Set the turn off time with the TIMER control button Press the RESERVE button 3 Press the ON TIMER button so ...

Page 20: ...ntrol button The setting of turn off time is now complete Example The device will turn off at 11 00p m Example The device will turn on at 7 00 a m The setting of the turn on time is now complete 4Set 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 an...

Page 21: ...yed 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 2 Press 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 s...

Page 22: ...her 2 Take out the batteries when you do not use the remote controller for 2 or 3 months CAUTION Push and pull to the direction of arrow 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 settin...

Page 23: ...with your wake up time in the morning This will enable you to enjoy a comfortable 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 f...

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 OFF Interference From Electrical Products Caution To avoid noise interfe...

Page 25: ... filters 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 personal Before cleaning stop operation and switch off the power supply CAUTION CAUTION Do not bend the air cleansing filter as it may cause damage to the structure NOTE In case of removing the air cleansing filters please follow the above proc...

Page 26: ...lter and air cleansing filter using vacuum cleaner If there is too much dust air filter only rinse under running tap water and gently brush it with soft bristle brush Allow filters to dry in shade 3 Re insert the air cleansing filter to the filter frame Set the filter with FRONT mark facing front and slot them into the original state After attaching the filters push the front panel at three arrow ...

Page 27: ... front panel with both hands to detach and attach it CAUTION Do not splash or direct water to the body of 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...

Page 28: ...or unstable 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 personal Before cleaning stop operation and switch off the power supply CAUTION Confirm 3 MAINTENANCE AT BEGINNING OF LONG OFF PERIOD Running the unit setting the operation mode to FAN and the fan speed to HI for abo...

Page 29: ... possibly be emitted 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...

Page 30: ...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 Unit mm Wireless remote controller 147 56 17 5 About 380 Viewed from back bottom direction pipe lead out D C B A L N D C B A Indoor Unit Outdoor Unit Connecting Cord Power supply cord MODEL RAS 70YH7 When piping is drawn hor...

Page 31: ...8 74 26 850 957 81 800 96 169 5 788 10 10 10 320 340 Air outlet 340 20 22 298 201 Handle Holes for anchor bolt 2 ø12 Fixing hole 507 198 57 12 37 Notch for anchor bolt 2 ø12 Notchs More than More than More than 100 More than 700 200 100 Service space ...

Page 32: ...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 M RED BLK WHT YEL BLU 100 322V 15V 0V 0 6 5V FG 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 70YH7 POWER SOURCE DC 120 380V OUTPUT W MAX 47 OUTDOOR FAN MOTOR...

Page 33: ...efrigerant check the color of the refrigerant oil inside the compressor If the color has been changed conspicuously replace the compressor V R YELLOW W S RED U C WHITE 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 70YH7 JU1015D9 2M 1 2984 U V W WHITE M M M YELLOW RED 2M 1 7671 ...

Page 34: ... 33 WIRING DIAGRAM MODEL RAS 70YH7 RAC 70YH7 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 70YH7 ...

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 70YH7 P W B MAIN ...

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

Page 41: ... 44 BLOCK DIAGRAM MODEL RAS 70YH7 RAC 70YH7 1ø 50 60Hz 220 240V AX 8X10 FM Outdoor DC Fan Motor ...

Page 42: ... 45 51 53 53 55 57 49 29 66 23 25 25 25 25 ...

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: ...ling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature 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 t...

Page 45: ...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 continue to be counted 9 If the set time is changed during sleep operation all data including set temperature time etc is cleared and restarted 10 If sleep operation is canceled by the cancel key or sleep key ...

Page 46: ... 53 ...

Page 47: ...peration continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal heating mode compressor maximum rpm WMAX will maintain for 120 minutes if indoor temperature is higher than 18 C No time limit constrain if indoor temperature is lower than 18 C and outdoor temperature is lower than 2 C 6 During Hotkeep or Defrost mode indoor operation lamp will blink at ...

Page 48: ... 57 DFTIM_OTP5 DFTIM_OTP10 DFTIM_OTP0 DFTIM_OTP0 DFTIM_OTP0 1 Refer to the Table 1 Mode data file on page 47 for the constants expressed by capital alphabet letters in the drawing ...

Page 49: ... DEHUMIDIFYING DEFROSTING OUTDOOR UNIT HEATING INDOOR UNIT COMP S TANK 5 8 5S VALVE SILENCER 1 4 2S VALVE EXPANSION VALVE STRAINER STRAINER COND REVERSING VALVE COMP S TANK 5 8 5S VALVE 1 4 2S VALVE EXPANSION VALVE HEX THERMISTOR STRAINER STRAINER COND REVERSING VALVE SILENCER HEX THERMISTOR ...

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: ...al of Q201 s base rises and Q202 is turned ON Since Q202 s collector is set to LO at this time Q202 is turned OFF and the reset input of the micro computer is set to Lo The DC 5V line voltage has already become 5V at this time and the micro computer starts operation When the power is turned OFF the voltage of the DC 12V line decreases When it becomes about 7V ZD202 is turned OFF then Q201 is turne...

Page 52: ...zzer 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 shaped 8 7 IC401 E 2PROM 6 5 Micro computer AX 7X30 26 27 R404 R403 ...

Page 53: ... output from pins of the micro computer Micro computer pins Step width Horizontal air deflectors 10ms 1 2 3 4 5 6 7 8 Horizontal air deflectors 10 11 12 13 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 st...

Page 54: ...er temperature input R308 5 4 3 2 1 0 0 10 Fig 6 2 20 30 40 Voltage at V A 5 4 3 2 1 0 0 10 10 Fig 7 2 20 30 40 Voltage at V A 64 63 7 Heat exchanger temperature 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 ope...

Page 55: ...SC 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 I O G 0V 20V 5V 5V 15V 0V VDC FM GND VCC VS FG JOINT CONNECTOR 1 3 4 5 6 340V R501 ZD201 ...

Page 56: ... 66 220 240 220 240 3 15A RAC 70YH7 ...

Page 57: ... 67 AC220 240V DC260 360V ...

Page 58: ... 68 C001 C007 C015 C016 C026 C027 L004 L005 J25 J25 J25 J23 J58 J25 ...

Page 59: ...measured by tester When collector voltage of Q401 is measured 4 1 28 36 I F 0V Fig 3 1 D401 CN2 Q401 DC voltmeter or tester Reversing valve R435 MICROCOMPUTER PQ701 1 2 3 4 12V HIC I F 35V R436 V R437 Operation condition Collector voltage of Q401 Cooling Heating Dehumidifying General operation of Cooling In normal heating operation MAX rotation speed instructed by indoor microcomputer after defros...

Page 60: ... 70 ...

Page 61: ... 71 ...

Page 62: ... 72 3 15A Fuse ...

Page 63: ... 73 3 15A 3 15A DC260 360V ...

Page 64: ...1 A1 A2 A1 A2 A3 Q3 Q1 Q2 Q3 A3 Q4 A4 The compressor has stopped suddenly during cooling operation Check if indoor heat exchanger is frosted Wait for 3 4 minutes until it is defrosted If the air conditioner operates in cooling mode when it is cold the evaporator may get frosted ...

Page 65: ... 75 AUTO FRESH DEFROSTING NICE TEMPERATURE RESERVATION AUTO OPERATION Q1 Q1 Q2 Q1 Q2 A1 A1 A2 Q3 A3 A1 A2 Q3 A3 ...

Page 66: ... 76 ...

Page 67: ... 77 ...

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

Page 69: ... 79 DISCHARGE PROCEDURE AND METHOD TO STOP ENERGIZE THE POWER CIRCUIT ...

Page 70: ... 80 ...

Page 71: ... 81 3 15A circuit diagram Replace fuse or P W B Main Replace P W Bs 140 50 CHECKING THE INDOOR TIMER LAMP IF BLINKING 1 TIME ...

Page 72: ... Yes Yes Yes No No No Normal No No Timer lamp Press the service switch for 1 sec Does the compressor operate After checking be sure to press the service switch to stop the operation Check the refrigerating cycle Check the outdoor electrical parts Check the indoor electrical parts Check to see whether the F cable is connected incorrectly or disconnected See Out door unit self diagnosis lamp lightin...

Page 73: ...eading 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 appears read every 3 minutes Electrical parts in the outdoor unit 1 Indoor interface circuit 2 Outdoor interface circuit Please check at the outdoor electrical led lamp ...

Page 74: ...g generated between terminals C and D on the terminal board Are control voltages 12V 5V being generated normally Check according to the proper method for checking the power circuit No No No No Yes Yes Do the air deflectors perform initial operation when the power supply is turned on and off Check the indication P W B connection cord and light receiving unit No No Is the microcomputer reset input p...

Page 75: ... 85 2 Outdoor unit does not operate but receives remote infrared signal ...

Page 76: ...T001 and interface relay 501 Disconnect joint connector at indoor fan motor and set to the fan mode again 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: ... D Is DC 35V being output between cathode and mode of D701 Is DC 12V being supplied accross the control side coil terminal of interface relay Replace the interface relay D701 and C701 may be defective There is a defective between the 12V output of switching power supply and interface relay ...

Page 78: ... 88 Has the 3 15A fuse blown Replace outdoor P W Bs Replace outdoor P W Bs Replace outdoor P W B Main Replace outdoor P W B Main Replace outdoor P W B Main Replace outdoor P W B Main ...

Page 79: ... 89 test Replace outdoor P W B Main Replace outdoor P W B Main Replace outdoor P W B Main Replace outdoor P W B Main ...

Page 80: ... 90 AC220 240V AC240V P W Bs P W Bs Replace outdoor P W B Main P W Bs ...

Page 81: ... 91 Replace outdoor P W B Main Replace fan motor Replace outdoor P W B Main ...

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 ...

Page 84: ... 94 ...

Page 85: ...ervice Switch for 1 second or more 5 Self diagnosis result will be shown LD303 will ON LIT and LD301 will be blinking Then refer to diagnosis table 2 6 Switch OFF main power supply Then release back JW001 and JW002 to original condition no short circuit condition If step No 6 is not carried out the system will not operate properly until 3 minutes has lapsed after restore the power supply ...

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

Page 87: ... the same condition as above The compressor is defective Replace it and seal refrigerant If the compressor checker for an inverter type air conditioner is available re check using it JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE Blinking off Time until the lamp lights Approx 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 seconds Compressor Compressor Gas leakage Possible ma...

Page 88: ... 98 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS 70YH7 1 9 4 5 8 2 3 12 11 10 7 25 6 26 20 16 19 13 15 18 22 14 24 17 21 23 ...

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 70YH7 18 23 24 32 28 12 11 6 10 1 27 9 30 14 26 13 5 4 20 19 21 22 29 7 3 8 2 25 31 34 16 15 17 33 ...

Page 91: ...A2 S01 1 P W B MAIN 16 PMRAC 70YHA2 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 CO...

Page 92: ...PM NO 0465E Printed in Malaysia RAS 70YH7 RAC 70YH7 ...

Search results

Summary of Contents for RAC-70YH7

Reviews:

Brands by name

Popular brands

Hitachi RAC-70YH7, Service Manual

Search results

Summary of Contents for RAC-70YH7

Reviews:

Brands by name

Popular brands