Mitsubishi Electric MSZ-EF18VGB Service Manual Download Page 42

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Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°C)

Resistance (kΩ)

Indoor electronic
control P.C. board

Indoor power P.C. board

Fuse (F11)

Varistor (NR11)

Indoor fan motor
(CN211)

325 V DC

(–) GND (high-

voltage DC)

15 V DC

(+)3-6 V DC

(+)0 or 15 V DC

Connector to terminal
block (CN201)

Connector to indoor
electronic control P.C.
board (CN202)

Receiver P.C. board

Display P.C. board

Switch P.C. board

Reactor (L111)

5 V DC

12 V DC

GND

Timer short mode
point JPG JPS (Refer
to 8-1.)

To disable "Auto restart function",
cut the Jumper wire to JR77.
(Refer to 8-3.)

Emergency operation
switch (E.O.SW) (SW1)

Connector to power
P.C. board (CN102)

Room temperature ther-
mistor RT11 (CN111)

Vane motor

(CN151)

Indoor coil ther-
mistor RT12,
RT13 (CN112)

MSZ-EF18VGW-

MSZ-EF22VGW-

ET1

MSZ-EF25VGW-

ET1

MSZ-EF35VGW-

ET1

MSZ-EF42VGW-

ET1

MSZ-EF50VGW-

ET1

MSZ-EF18VGB-

MSZ-EF22VGB-

ET1

MSZ-EF25VGB-

ET1

MSZ-EF35VGB-

ET1

MSZ-EF42VGB-

ET1

MSZ-EF50VGB-

ET1

MSZ-EF18VGS-

MSZ-EF22VGS-

ET1

MSZ-EF25VGS-

ET1

MSZ-EF35VGS-

ET1

MSZ-EF42VGS-

ET1

MSZ-EF50VGS-

ET1

10-7. TEST POINT DIAGRAM AND VOLTAGE

1. Indoor electronic control P.C. board, indoor power P.C. board, receiver P.C. board and display P.C. board

OBH831A

Summary of Contents for MSZ-EF18VGB

Page 1: ...SZ EF VGS VGKS PARTS CATALOG OBB831 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND FUNCTIONS 4 3 SPECIFICATION 5 4 NOISE CRITERIA CURVES 7 5 OUTLINES AND DIMENSIONS 9 6 WIRING DIAGRAM 10 7 REFRIGERANT SYSTEM DIAGRAM 15 8 SERVICE FUNCTIONS 16 9 MICROPROCESSOR CONTROL 19 10 TROUBLESHOOTING 27 11 DISASSEMBLY INSTRUCTIONS 44 SERVICE MANUAL Outdoor unit service manual MUZ EF VG H Series OBH832 MXZ F V...

Page 2: ... When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec l...

Page 3: ...cedure Deleting the memorized abnormal condition described in 10 2 1 MSZ EF18VGW B S E1 MSZ EF18VGW B S E2 MSZ EF22VGW B S E1 ET1 MSZ EF22VGW B S E2 ET2 MSZ EF25VGW B S E1 ET1 MSZ EF25VGW B S E2 ET2 MSZ EF35VGW B S E1 ET1 MSZ EF35VGW B S E2 ET2 MSZ EF42VGW B S E1 ET1 MSZ EF42VGW B S E2 ET2 MSZ EF50VGW B S E1 ET1 MSZ EF50VGW B S E2 ET2 1 Indoor electronic control P C board has been changed MSZ EF18...

Page 4: ...2VGKB MSZ EF25VGKB MSZ EF35VGKB MSZ EF42VGKB MSZ EF50VGKB MSZ EF18VGKS MSZ EF22VGKS MSZ EF25VGKS MSZ EF35VGKS MSZ EF42VGKS MSZ EF50VGKS Remote controller Model MSZ EF18VGW MSZ EF18VGB MSZ EF18VGS MSZ EF22VGW MSZ EF22VGB MSZ EF22VGS MSZ EF25VGW MSZ EF25VGB MSZ EF25VGS MSZ EF35VGW MSZ EF35VGB MSZ EF35VGS MSZ EF42VGW MSZ EF42VGB MSZ EF42VGS MSZ EF50VGW MSZ EF50VGB MSZ EF50VGS MSZ EF18VGKW MSZ EF18VGK...

Page 5: ...ating Super High m3 h 714 762 High 534 Med 372 Low 276 Silent 240 Sound level Cooling Super High dB A 42 High 36 Med 29 30 Low 23 24 Silent 19 21 Heating Super High dB A 45 46 High 37 38 Med 29 30 Low 24 Silent 21 Fan speed Cooling Super High rpm 1 200 High 990 Med 800 Low 630 Silent 570 Heating Super High rpm 1 330 1 400 High 1 050 Med 790 Low 630 Silent 570 Fan speed regulator 5 Remote controlle...

Page 6: ...igh m3 h 672 678 High 534 552 Med 462 474 Low 396 408 Silent 348 Heating Super High m3 h 792 876 High 594 666 Med 468 540 Low 378 432 Silent 330 384 Sound level Cooling Super High dB A 43 43 High 39 40 Med 35 36 Low 31 33 Silent 28 30 Heating Super High dB A 48 49 High 41 43 Med 35 37 Low 30 33 Silent 28 30 Fan speed Cooling Super High rpm 1 260 1 270 High 1 050 1 080 Med 930 950 Low 830 850 Silen...

Page 7: ...MSZ EF18VGKW MSZ EF22VGKW MSZ EF25VGKW MSZ EF18VGB MSZ EF22VGB MSZ EF25VGB MSZ EF18VGKB MSZ EF22VGKB MSZ EF25VGKB MSZ EF18VGS MSZ EF22VGS MSZ EF25VGS MSZ EF18VGKS MSZ EF22VGKS MSZ EF25VGKS MSZ EF35VGW MSZ EF35VGKW MSZ EF35VGB MSZ EF35VGKB MSZ EF35VGS MSZ EF35VGKS 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re...

Page 8: ... BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED HEATING 43 49 NC 10 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED HEATING 43 48 NC 10 MSZ EF42VGW MSZ EF42VGKW MSZ EF42VGB MSZ EF42VG...

Page 9: ...VGS MSZ EF50VGS Unit mm MSZ EF18VGKW MSZ EF22VGKW MSZ EF25VGKW MSZ EF35VGKW MSZ EF42VGKW MSZ EF50VGKW MSZ EF18VGKB MSZ EF22VGKB MSZ EF25VGKB MSZ EF35VGKB MSZ EF42VGKB MSZ EF50VGKB MSZ EF18VGKS MSZ EF22VGKS MSZ EF25VGKS MSZ EF35VGKS MSZ EF42VGKS MSZ EF50VGKS Piping Insulation ø37 O D Liquid line ø6 35 0 5 m Flared connection ø6 35 Gas line ø9 52 0 43 m Flared connection ø9 52 Drain hose Insulation ...

Page 10: ...SZ EF35VGW E1 ET1 MSZ EF42VGW E1 ET1 MSZ EF50VGW E1 ET1 MSZ EF18VGB E1 MSZ EF22VGB E1 ET1 MSZ EF25VGB E1 ET1 MSZ EF35VGB E1 ET1 MSZ EF42VGB E1 ET1 MSZ EF50VGB E1 ET1 MSZ EF18VGS E1 MSZ EF22VGS E1 ET1 MSZ EF25VGS E1 ET1 MSZ EF35VGS E1 ET1 MSZ EF42VGS E1 ET1 MSZ EF50VGS E1 ET1 ...

Page 11: ...22VGS ET2 3 MSZ EF25VGS ET2 MSZ EF35VGS ET2 MSZ EF42VGS ET2 Terminal bloğu Konektör NOTLAR 1 Dış ünite elektronik kablolaması için dış ünite elektronik kablo devre şemasını referans alınız 2 Sadece bakır besleme kablosu kullanın 3 Sembolleri gösterir SİGORTA T3 15AL250V FAN MOTORU VARİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA TERMİNAL BLOĞU RÖLE BORU SICAKLIK TERMİSTÖRÜ YARDIMCI KA...

Page 12: ...evre şemasını referans alınız 2 Sadece bakır besleme kablosu kullanın 3 Sembolleri gösterir DIŞ ÜNİTEYE GÖSTERGE KARTI ALICI KARTI SİVİÇ KARTI İÇ ÜNİTE GÜÇ KARTI İÇ ÜNİTE ELEKTRONİK KONTROL KARTI SİGORTA T3 15AL250V ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA TERMİNAL BLOĞU RÖLE BORU SICAKLIK TERMİSTÖRÜ YARDIMCI FAN MOTORU VARİSTÖR KANAT MOTORU YATAY ALT KANAT MOTORU YATAY ÜST REAKTÖR ...

Page 13: ...EF22VGKS ET1 3 MSZ EF25VGKS ET1 MSZ EF35VGKS ET1 MSZ EF42VGKS ET1 DIŞ ÜNİTEYE GÖSTERGE KARTI ALICI KARTI SİVİÇ KARTI İÇ ÜNİTE GÜÇ KARTI İÇ ÜNİTE ELEKTRONİK KONTROL KARTI SİGORTA T3 15AL250V FAN MOTORU VARİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA TERMİNAL BLOĞU RÖLE BORU SICAKLIK TERMİSTÖRÜ YARDIMCI KANAT MOTORU YATAY ALT KANAT MOTORU YATAY ÜST RESİSTÖR PARÇA ADI Wİ Fİ ARAYÜZÜ Term...

Page 14: ... şemasını referans alınız 2 Sadece bakır besleme kablosu kullanın 3 Sembolleri gösterir DIŞ ÜNİTEYE GÖSTERGE KARTI ALICI KARTI SİVİÇ KARTI İÇ ÜNİTE GÜÇ KARTI İÇ ÜNİTE ELEKTRONİK KONTROL KARTI Wİ Fİ ARAYÜZÜ SİGORTA T3 15AL250V ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA TERMİNAL BLOĞU RÖLE BORU SICAKLIK TERMİSTÖRÜ YARDIMCI FAN MOTORU VARİSTÖR KANAT MOTORU YATAY ALT KANAT MOTORU YATAY ÜST R...

Page 15: ...heating Unit mm REFRIGERANT SYSTEM DIAGRAM 7 MSZ EF18VGW MSZ EF22VGW MSZ EF25VGW MSZ EF35VGW MSZ EF42VGW MSZ EF50VGW MSZ EF18VGB MSZ EF22VGB MSZ EF25VGB MSZ EF35VGB MSZ EF42VGB MSZ EF50VGB MSZ EF18VGS MSZ EF22VGS MSZ EF25VGS MSZ EF35VGS MSZ EF42VGS MSZ EF50VGS MSZ EF18VGKW MSZ EF22VGKW MSZ EF25VGKW MSZ EF35VGKW MSZ EF42VGKW MSZ EF50VGKW MSZ EF18VGKB MSZ EF22VGKB MSZ EF25VGKB MSZ EF35VGKB MSZ EF42V...

Page 16: ...EF50VGKS 8 2 HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT A maximum of 4 indoor units with wireless remote controllers can be used in a room To operate the indoor units individually with each remote controller assign a number to each remote controller according to the number of the indoor unit This setting can be set only when all the following conditions are met The remot...

Page 17: ...zed when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled If the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breake...

Page 18: ...ault 1 Open the front panel and remove the Wi Fi interface 2 Set up a connection between the Wi Fi interface and the router Refer to the SETUP MANUAL and SETUP QUICK REFERENCE GUIDE provided with the unit For SETUP MANUAL please go to the website below http www melcloud com Support 3 Put the Wi Fi interface back and close the front panel after the setup is completed 4 For MELCloud User Manual plea...

Page 19: ...shape of the indication Indication Operation state Room temperature The unit is operating to reach the set temperature About 2 C or more away from set temperature The room temperature is approaching the set tem perature About 1 to 2 C from set temperature Standby mode Only during multi system operation INDOOR UNIT DISPLAY SECTION Lit Blinking Not lit Signal transmitting section Operation display s...

Page 20: ...he con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of outdoor heat exchanger becomes too low The compressor st...

Page 21: ...e other operating mode COOL HEAT and becomes a state of standby Refer to NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect 2 or more indoor units with one outdoor unit When you try to operate 2 or more indoor units with one outdoor unit simultaneously one for the cooling and the oth ers for heating the o...

Page 22: ...the upper vane swings 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat off this control does not work in the indoor unit 5 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position a When STOP OPE...

Page 23: ... OFF timer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the ...

Page 24: ...ed All days can be selected NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the weekly timer is set temperature cannot be set to 10 C The weekly timer operation and i save operation cannot be used together 1 How t...

Page 25: ...ks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them will be displayed 4 Press button to complete and transmit the weekly timer setting which was blink ing goes out and the current time will be displayed 9 9 i save OPER...

Page 26: ...ed The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION...

Page 27: ...and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally Lead wiring Connector housing Incorrect Correct TROUBLESHOOTING 10 NOTE 1 If RESET button is not pressed the remote controller may not o...

Page 28: ...r the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4 Release the failure mode recall function according to Releasing the failure mode recall function men tioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwis...

Page 29: ...ristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time blink 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time blink 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for the 12 seconds after the indoor...

Page 30: ...ration means the operation within 30 minutes af ter EMERGENCY OPERATION switch is pressed Refer to outdoor unit service manual Left lamp Blink on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Left lamp 2 time blink Cause Indoor unit Trouble of room temperature indoor coil thermistor Left lamp 3 time blink Cause Indoor unit Trouble of indoor fan mo...

Page 31: ... Check the instruction manuals for the router and the device such as a smartphone and enable the Internet access There is a problem in communication between the air conditioner and the Wi Fi interface Check whether the air conditioner can be oper ated with a remote controller If the air conditioner does not operate Check indoor outdoor connect ing wire and the power supply Check the indoor power P...

Page 32: ...rcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6 Outdoor thermistors Left lamp blinks 6 time blink 2 5 second OFF The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service ma...

Page 33: ... Refer to 10 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Vane motor MV Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED BLK 232 268 Ω BLK BLK RED BLK BLK ROTOR OPERATION INDICATOR Lit Blinking Not lit No Abnormal point Operati...

Page 34: ...ove goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 ...

Page 35: ...id start type within the range of 1 m 2 Yes No Reinstall the unit away from lights Attach a filter on receiving part Replace the indoor electronic control P C board Including the receiver 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting section lights up when ...

Page 36: ...the fuse F11 3 Measure the resistance of reactor L111 on the indoor power P C board No No Replace the indoor power P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 10 5 Short circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wire is red whereas is black...

Page 37: ...the indoor power P C board No No Replace the indoor power P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 10 5 Short circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wire is red whereas is black 2 Connect of the tester to fan motor connector s lead wi...

Page 38: ... F11 3 Measure the resistance of reactor L112 on the indoor power P C board No No Replace the indoor power P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 10 5 Short circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wire is red whereas is black 2 Conne...

Page 39: ...t for 2 or more minutes after the main power supply is turned ON Touch CN102 and JPG CN102 with tester probes and start the emergency operation No Does the indoor OPERATION INDICATOR lamp left blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Yes Does the outdoor LED blink 6 times Yes Confirm that the thermo stat is OFF and wiring is not loose No Do...

Page 40: ...onfirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection and or poor contact to the terminal block replace the indoor outdoor connecting wire No Is there 2 V DC or less between CN102 and JPG CN102 GND on the indoor electronic control P C board No Yes Yes 3 Be sure to check this within 3 min...

Page 41: ...r the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor o...

Page 42: ... restart function cut the Jumper wire to JR77 Refer to 8 3 Emergency operation switch E O SW SW1 Connector to power P C board CN102 Room temperature ther mistor RT11 CN111 Vane motor CN151 Indoor coil ther mistor RT12 RT13 CN112 MSZ EF18VGW E1 MSZ EF22VGW E1 ET1 MSZ EF25VGW E1 ET1 MSZ EF35VGW E1 ET1 MSZ EF42VGW E1 ET1 MSZ EF50VGW E1 ET1 MSZ EF18VGB E1 MSZ EF22VGB E1 ET1 MSZ EF25VGB E1 ET1 MSZ EF35...

Page 43: ...25VGS E2 ET2 MSZ EF35VGS E2 ET2 MSZ EF42VGS E2 ET2 MSZ EF50VGS E2 ET2 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Temperature C Resistance kΩ Indoor electronic control P C board Indoor power P C board Fuse F11 Varistor NR11 Indoor fan motor CN211 325 V DC GND high voltage DC 15 V DC 3 6 V DC 0 or 15 V DC Connector to terminal block CN201 Connector to indoor electronic control...

Page 44: ... remove the panel by pushing it upward Photo 1 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminal with lockig mechanism The terminal w...

Page 45: ...mp and the indoor outdoor connecting wire 3 Remove the indoor electrical box Refer to section 2 4 Remove the earth wire connected to the electrical box from the indoor power P C board 5 Disconnect the following connectors Indoor electronic power P C board CN201 Terminal block CN202 To the indoor electronic control P C board 6 Remove the indoor power P C board 7 Disconnect the following connectors ...

Page 46: ...move the display P C board holder 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to section 5 Photo 4 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 4 2 Remove the screws of the vane motor unit cover and pull out the vane motor unit 3 Remove the screws of the vane motor unit 4 Disconnect the conne...

Page 47: ...out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 5 9 Remove the screws fixing the left side and the upper right side of the heat exchanger Photo 7 Photo 8 10 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line fl...

Page 48: ...nd remove the Wi Fi cover 4 Remove the Wi Fi interface on the right side of the panel Pull out the Wi Fi cable and pull out the cable tie fixed on the panel 5 Insert Wi Fi interface into the water cut in the same direction as Photo 1 3 and fix it temporary 6 Unhook the lower part C of the panel 7 First hold the lower part of the right end of the panel and hold the lower part of the left end of the...

Page 49: ...l box 4 Removing the indoor power P C board the switch board the display board the receiver board and the indoor electronic control P C board 1 Remove the panel Refer to Section 1 and the corner box right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the indoor electrical box Refer to section 3 4 Remove the earth wire connected to the elec...

Page 50: ...move the display P C board holder 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to section 6 Photo 4 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 5 2 Remove the screws of the vane motor unit cover and pull out the vane motor unit 3 Remove the screws of the vane motor unit 4 Disconnect the conne...

Page 51: ...out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 5 9 Remove the screws fixing the left side and the upper right side of the heat exchanger Photo 7 Photo 8 10 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line fl...

Page 52: ...hermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape part When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down About the same length Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued Jan 2020 No OBH831 REVISED EDITION A Published Ja...

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