Mitsubishi Electric MSZ-FT25VG-E1 Service Manual Download Page 10 | Manualshive

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10

REFRIGERANT SYSTEM DIAGRAM

7

Unit: mm

MSZ-FT25VG MSZ-FT35VG MSZ-FT50VG

MSZ-FT25VGK MSZ-FT35VGK MSZ-FT50VGK

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø9.52

(with heat insulator)

Refrigerant pipe ø6.35

(with heat insulator)

Indoor coil

thermistor

RT12

Indoor coil

thermistor

RT13

Refrigerant flow in cooling

Refrigerant flow in heating

OBH864

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Summary of Contents for MSZ-FT25VG-E1

Page 1: ...NSIONS 6 6 WIRING DIAGRAM 7 7 REFRIGERANT SYSTEM DIAGRAM 10 8 SERVICE FUNCTIONS 11 9 MICROPROCESSOR CONTROL 13 10 TROUBLESHOOTING 22 11 DISASSEMBLY INSTRUCTIONS 36 SERVICE MANUAL No OBH864 Models MSZ FT25VG E1 MSZ FT25VGK E1 ET1 SC1 MSZ FT35VG E1 MSZ FT35VGK E1 ET1 SC1 MSZ FT50VG E1 MSZ FT50VGK E1 ET1 SC1 Outdoor unit service manual MUZ FT VG Series OBH865 ...

Page 2: ...T1 SC1 MSZ FT50VGK E1 ET1 SC1 1 New model Preparation before the repair service Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform th...

Page 3: ...r Wi Fi interface Emergency operation switch PART NAMES AND FUNCTIONS 2 MSZ FT25VG MSZ FT35VG MSZ FT50VG MSZ FT25VGK MSZ FT35VGK MSZ FT50VGK ACCESSORIES Model MSZ FT25VG MSZ FT25VGK MSZ FT35VG MSZ FT35VGK MSZ FT50VG MSZ FT50VGK Installation plate 1 Installation plate fixing screw 4 25 mm 5 Wireless remote controller 1 Felt tape For left or left rear piping 1 Battery AAA for remote controller 2 Rem...

Page 4: ... 19 28 Heating Super High 49 52 54 High 46 49 51 Med 39 42 45 Low 31 33 36 Super Low 19 28 Fan speed Cooling Super High rpm 1 100 1 150 High 970 990 1 080 Med 820 830 930 Low 660 670 780 Super Low 500 630 Heating Super High 1 160 1 260 1 320 High 1 080 1 180 1 240 Med 880 960 1 040 Low 690 730 840 Super Low 500 630 Fan speed regulator 5 Remote controller model E1 ET1 SH20E SC1 SH20D NOTE Test cond...

Page 5: ...00 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 10 20 30 40 50 60 70 80 90 NC 20 NC 70 NC 60 NC 50 NC 40 NC 30 COOLING FUNCTION SPL dB A LINE HEATING 48 54 BAND CENTER FREQUENCIES Hz 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 10 20 30 40 50 60 70 80 90 NC 20 NC 70 NC 60 NC 50 NC 40 NC 30 COOLING FUNCTION SPL dB A LINE HEATING 46 49 Te...

Page 6: ...6 OUTLINES AND DIMENSIONS 5 Unit mm MSZ FT25VG MSZ FT35VG MSZ FT50VG MSZ FT25VGK MSZ FT35VGK MSZ FT50VGK OBH864 ...

Page 7: ...7 MSZ FT25VG E1 WIRING DIAGRAM 6 MSZ FT35VG E1 MSZ FT50VG E1 OBH864 ...

Page 8: ...8 MSZ FT25VGK E1 SC1 MSZ FT35VGK E1 SC1 MSZ FT50VGK E1 SC1 OBH864 ...

Page 9: ...L BLOĞU RÖLE 1C PARÇA ADI KANAT MOTORU DİKEY KANAT MOTORU YATAY ALT KANAT MOTORU YATAY ÜST MSZ FT35VGK ET1 MSZ FT50VGK ET1 SİGORTA T3 15AL250V FAN MOTORU VARİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA BORU SICAKLIK TERMİSTÖRÜ YARDIMCI TERMİNAL BLOĞU RÖLE 1C PARÇA ADI KANAT MOTORU DİKEY KANAT MOTORU YATAY ALT KANAT MOTORU YATAY ÜST REAKTÖR DIŞ ÜNİTEYE İÇ ÜNİTE ELEKTRONİK KONTROL KART...

Page 10: ...FT50VGK Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø9 52 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 Indoor coil thermistor RT13 Refrigerant flow in cooling Refrigerant flow in heating OBH864 ...

Page 11: ...onnected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore the special counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one GND INDOOR electronic control P C board JR77 CN151 CN211 ...

Page 12: ... the Wi Fi interface back and close the front panel after the setup is completed 4 For MELCloud User Manual please go to the website below http www melcloud com Support NOTE Mitsubishi Electric s Wi Fi interface is designed for communication to Mit subishi Electric s MELCloud Wi Fi service Third party Wi Fi interfaces cannot be connected to MELCloud Mitsubishi Electric is not responsible for any i...

Page 13: ...et buttons TIME TIMER set buttons FORWARD button BACKWARD button RESET button i save button NIGHT MODE button VANE CONTROL button WIDE VANE button Signal transmitting section Operation display section TEMPERATURE buttons STOP OPERATE OFF ON button Indication of remote controller model is on back Distance of signal About 6 m Beep s is are heard from the indoor unit when the signal is received FAN S...

Page 14: ...hen AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 9 4 HEAT OPERATION 1 Press STOP OPERATE OFF ON button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 10 31 C 9 1 COOL OPERATION 1 Press STOP OPERATE OFF...

Page 15: ... temperature is equal to or lower than the set temperature operation starts in HEAT mode 2 Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 1 C below the set temperature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1 C above the set temperature NOTE 1 If 2 or more indoor units are operating in multi...

Page 16: ...m tem perature distribution Horizontal position In COOL and DRY operation Vane angle is fixed to Horizontal position In HEAT operation Vane angle is fixed to Downward position 7 SWING mode By selecting SWING mode with VANE control button the horizontal vane swings vertically 8 ECONO COOL operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature and the air flow ...

Page 17: ...hout setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK button How to set the current time a Press the CLOCK button b Press the TIME SET buttons and to set the current time Each time FORWARD button is pressed the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 mi...

Page 18: ...ith timer cancelled when power is restored 9 8 WEEKLY TIMER OPERATION A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week 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 si...

Page 19: ...utton to enter the weekly timer setting mode blinks 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 NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the ...

Page 20: ...e for COOL ECONO COOL CIRCULATOR one for HEAT 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing POWERFUL button or OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing i save button 9 11 CIRCULATOR OPERATION In case the indoor temperature reaches the setting temperature the outdoor...

Page 21: ...ed shifts to Medium 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 EM...

Page 22: ...ATOR lamp is blinking ON and OFF before starting ser vice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electric control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 4 NOTE 1 If RESET button is not pressed the remote...

Page 23: ...e recall function mentioned above Press OFF ON stop operate button of the remote controller 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 Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Yes Blinks No OFF N...

Page 24: ...ristics of the main indoor coil thermistor the sub indoor coil thermistor 10 7 3 time blink 2 5 sec ond 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 25: ...utdoor unit service manual Upper lamp blink on and off at 0 5 second intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Upper lamp 2 time blink Cause Indoor unit Trouble of room temperature indoor coil thermistor Upper lamp 3 time blink Cause Indoor unit Trouble of indoor fan motor Upper lamp 4 time blink Cause Indoor unit Trouble of indoor unit control system Upper lamp 5 t...

Page 26: ...er and the device such as a smartphone and enable the Internet access Start Is UNIT LED on the Wi Fi interface blinking Can the device such as a smartphone be connected to the Internet through the router Has pairing of the Wi Fi interface and the router been successfully completed Is NET LED on the Wi Fi interface blinking Is ERR LED on the Wi Fi interface blinking If the problem persists please h...

Page 27: ...compressor Refer to outdoor unit service manual Check the stop valve 6 Outdoor thermistors Upper 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 manual 7 Outdoor control sys tem Upper lamp blinks 7 time blink 2 5 second OFF It cannot properly read data in the non...

Page 28: ...h a tester Temperature 10 30 C Color of the lead wire Normal RED BLK 262 328 Ω BLK BLK RED BLK BLK ROTOR OPERATION INDICATOR No Abnormal point Operation indicator lamp Symptom Condition Remedy 1 MXZ type Operation mode setting Upper lamp lights and lower lamp blinks 2 5 second OFF Outdoor unit operates but indoor unit does not operate The operation mode of the each indoor unit is differently set t...

Page 29: ...ectronic control P C board 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above 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...

Page 30: ...able to operate with it if the inverter fluorescent light is turned on when the room is warm the unit may be able to operate with the remote controller Replace the indoor electronic control P C board Including the receiver Does the unit operate with the remote controller OK Yes No Not clear Replace the batteries Refer to 10 1 4 Press OFF ON stop operate button on the remote controller Is LCD displ...

Page 31: ...ce between CN211 and of indoor fan motor connector 2 3 Yes Is the resistance 1MΩ or more Replace the fuse F11 and the indoor fan motor 3 No Replace the fuse F11 1 Measure the resistance of resistor R111 on the indoor power P C board No Replace the indoor electronic control P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor co...

Page 32: ...F and wiring is not loose No Does DC 6 V or more occur between indoor terminal block S2 and S3 Yes Replace the outdoor inverter P C board 1 No Replace the indoor electronic control P C board 1 Electric charge may remain immediately after the power supply is turned OFF Perform the procedure 3 minutes after the power off operation Replace the outdoor inverter P C board 1 Yes No Was the indoor unit e...

Page 33: ...ny error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor connecting wire Is serial signal error indicated 6 minutes later Yes No Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION switch Reinstall either the unit or the l...

Page 34: ...he 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 outd...

Page 35: ...thermistor RT11 Indoor coil thermistor RT12 RT13 Temperature C Resistance kΩ Connector to Indoor fan motor CN211 Resistor R111 Room temperature thermistor RT11 CN111 Connector to Indoor coil thermistor RT12 RT13 CN112 Connector to vane motor CN151 12 V DC 5 V DC GND To disable Auto restart function cut the Jumper wire to JR77 Refer to 8 3 Fuse F11 T3 15AL250V Varistor NR11 Emergency operation swit...

Page 36: ...wn 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 locking mechanism The terminal which has the locking mechanism can be detached as shown below There are following 2 types of the terminal with locking mechanism The terminal withou...

Page 37: ...board the switch buzzer P C board and the receiver P C board 8 Remove the screw of the terminal block and remove the earth wire connected to the electrical box from the indoor electronic control P C board 9 Remove the lead wires from the connector CN10A 10 Remove the display P C board holder from the electrical box 11 Remove the display P C board the switch buzzer P C board the receiver P C board ...

Page 38: ...the vertical vane motor from the arm of the vertical vane 3 Remove the screw of the vertical vane motor and pull the vertical vane motor 4 Remove the crank of the vertical vane motor unit from the shaft of the vane motor 5 Remove the vertical vane motor from the vertical vane motor unit 6 Disconnect the connector of vertical vane motor from the vertical vane motor 5 Removing the horizontal vane mo...

Page 39: ...nd remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the indoor heat exchanger Install the indoor coil thermistor in its former position when assembling it 9 Remove the screws fixing the left side of the indoor heat exchanger 10 Lift the indoor heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line ...

Page 40: ...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 panel 8 Pull the panel slightly toward you and then remove the panel by pushing it upward 40 11 2 MSZ FT25VGK MSZ FT35VGK MSZ FT50VGK NOTE Turn OFF the power supply before disassembly Indicates the visible parts in the pho...

Page 41: ...efer 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 screw of the terminal block and remove the earth wire connected to the electrical box from the indoor electronic control P C board 5 Remove the lead wires from the connector CN10A 6 Remove the d...

Page 42: ...the vertical vane motor from the arm of the vertical vane 3 Remove the screw of the vertical vane motor and pull the vertical vane motor 4 Remove the crank of the vertical vane motor unit from the shaft of the vane motor 5 Remove the vertical vane motor from the vertical vane motor unit 6 Disconnect the connector of vertical vane motor from the vertical vane motor 7 Removing the horizontal vane mo...

Page 43: ...d remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the indoor heat exchanger Install the indoor coil thermistor in its former position when assembling it 9 Remove the screws fixing the left side of the indoor heat exchanger 10 Lift the indoor heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line f...

Page 44: ... to avoid loss and accidental falling of the clip shape part inside the unit Mount the clip shape part on the marked position Do not pull the lead wire when removing the indoor coil thermistor Holder shape Clip shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Chec...

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