Mitsubishi Electric MSZ-AP25VG Service Manual Download Page 1

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SERVICE MANUAL

INDOOR UNIT

PARTS CATALOG (OBB788)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

No. OBH788

Outdoor unit service manual
MUZ-AP·VG(H) Series (OBH789)
MXZ-D·VA(H) Series (OBH626)
MXZ-E·VA(H) Series (OBH723)

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS ····················· 3

3. SPECIFICATION ················································ 4

4. NOISE CRITERIA CURVES ······························ 5

5. OUTLINES AND DIMENSIONS ························ 6

6. WIRING DIAGRAM ············································ 7

7. REFRIGERANT SYSTEM DIAGRAM ··············· 9

8. SERVICE FUNCTIONS ··································· 10

9. MICROPROCESSOR CONTROL ··················· 12

10. TROUBLESHOOTING ····································· 19

11. DISASSEMBLY INSTRUCTIONS ···················· 33

Models

MSZ-AP25VG

EN1

MSZ-AP35VG

EN1

MSZ-AP42VG

EN1

MSZ-AP50VG

EN1

MSZ-AP25VGK

EN1

MSZ-AP35VGK

EN1

MSZ-AP42VGK

EN1

MSZ-AP50VGK

EN1

Summary of Contents for MSZ-AP25VG

Page 1: ...TS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 NOISE CRITERIA CURVES 5 5 OUTLINES AND DIMENSIONS 6 6 WIRING DIAGRAM 7 7 REFRIGERANT SYSTEM DIAGRAM 9 8 SERVICE FUNCTIONS 10 9 MICROPROCESSOR CONTROL 12 10 TROUBLESHOOTING 19 11 DISASSEMBLY INSTRUCTIONS 33 Models MSZ AP25VG E1 EN1 MSZ AP35VG E1 EN1 MSZ AP42VG E1 EN1 MSZ AP50VG E1 EN1 MSZ AP25VGK E1 EN1 MSZ AP35VGK E1 EN1 MSZ...

Page 2: ...MSZ AP42VGK E1 EN1 MSZ AP50VGK E1 EN1 1 New model 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 labels provided with our products We will not be held responsible for mechanical failure system mal...

Page 3: ...e 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 Operation indicator lamp Remote control receiving section Air inlet Front panel Air outlet Spec name plate Air lter Air purifying lter Air cleaning lter Silver ionized air puri er lter option Horizontal vane Emergency operation switch Wi Fi interface MSZ AP VGK Remote ...

Page 4: ...40 High 534 564 600 Med 438 462 492 Low 354 366 390 Silent 294 318 336 Sound level Cooling Super High dB A 42 44 High 36 38 40 Med 30 34 36 Low 24 29 33 Silent 19 21 28 Heating Super High dB A 45 48 High 39 38 40 43 Med 34 31 35 38 Low 24 29 33 Silent 19 21 28 Fan speed Cooling Super High rpm 970 1 050 High 790 830 880 Med 670 720 770 Low 580 630 680 Silent 500 540 590 Heating Super High rpm 1 070...

Page 5: ... NOISE CRITERIA CURVES 4 Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C Wet bulb temperature 15 C INDOOR UNIT WALL MICROPHONE 0 8m 1m MSZ AP42VG MSZ AP42VGK 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...

Page 6: ...ING SPACER MIN 116mm WALL HOLE 65 MSZ AP25 35 42 50VG K E1 MSZ AP25 35 42 50VG K EN1 Piping Insulation ø37 O D Liquid line ø6 35 0 39m Flared connection ø6 35 Gas line ø9 52 0 34m Flared connection ø9 52 Drain hose Insulation ø29 Connected part ø16 O D Piping Insulation ø37 O D Liquid line ø6 35 0 5m Flared connection ø6 35 Gas line ø9 52 0 45m Flared connection ø9 52 Drain hose Insulation ø29 Con...

Page 7: ...7 MSZ AP25VG E1 EN1 MSZ AP35VG E1 EN1 MSZ AP42VG E1 EN1 WIRING DIAGRAM 6 MSZ AP50VG E1 EN1 OBH788 ...

Page 8: ...8 MSZ AP25VGK E1 EN1 MSZ AP35VGK E1 EN1 MSZ AP42VGK E1 EN1 MSZ AP50VGK E1 EN1 OBH788 ...

Page 9: ...oling Refrigerant flow in heating Unit mm REFRIGERANT SYSTEM DIAGRAM 7 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 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating MSZ AP25VG MSZ AP35VG MSZ AP25V...

Page 10: ...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 remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited 1 Hold down button on the remote controller for 2 seconds to enter the pairing mode 2 Press button again and assign a number to each remote controller Each press of b...

Page 11: ...ace communicates the status information and controls the commands from the MELCloud by connecting to an indoor unit 1 MODE switch 7KH 02 VZLWFK LV XVHG IRU VHOHFWLQJ PRGHV LQ FRQ JXUDWLRQV 2 RESET switch ROG GRZQ WKH 5 6 7 VZLWFK IRU VHFRQGV WR UHERRW WKH V VWHP ROG GRZQ WKH 5 6 7 VZLWFK IRU VHFRQGV WR LQLWLDOL H WKH L L LQWHUIDFH WR the factory default 1 Open the front panel and remove the Wi Fi ...

Page 12: ...al About 6 m Beep s is are heard from the indoor unit when the signal is received INDOOR UNIT DISPLAY SECTION Lit Blinking Not lit 9 1 COOL OPERATION 1 Press STOP OPERATE OFF ON button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is...

Page 13: ... the temperature of the indoor heat exchanger to prevent the 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 o...

Page 14: ...osition the vane moves until it touches the vane stopper Then the vane is set to the selected angle Confirming of standard position is performed in the following cases a When the operation starts or finishes including timer operation b When the test run starts c When standby mode only during multi system operation starts or finishes 4 VANE AUTO mode In VANE AUTO mode the microprocessor automatical...

Page 15: ...on 2 Press STOP OPERATE OFF ON button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button during operation b Set the time of the timer using TIME SET buttons and 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 tim...

Page 16: ...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 Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode 2 Press and buttons to select setting day and number blinks Pressing selects the day of ...

Page 17: ...e day of the week whose timer setting is complete will light Press button again to turn the weekly timer OFF goes out NOTE The saved settings will not be cleared when the weekly timer is turned OFF 2 Checking weekly timer setting 2 Checking weekly timer setting 1 Press button to enter the weekly timer setting mode blinks 2 Press or buttons to view the setting of the particular day or number 3 Pres...

Page 18: ...on NOTE i save operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode i save operation is 10 31 C 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is selected from the...

Page 19: ...re servicing check that the connector and terminal are connected properly 3 When the 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 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate th...

Page 20: ... 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 mentioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnorma...

Page 21: ...istor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time flash 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 flash 2 5 second OFF Indoor fan mot...

Page 22: ...MERGENCY OPERATION switch is pressed Refer to outdoor unit service manual Upper lamp Flash on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Upper lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor Upper lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Upper lamp 4 time flash Cause Indoor unit Trou...

Page 23: ... down the RESET switch of Wi Fi interface for 2 seconds The com munication with the air conditioner is normal if the UNIT lamp starts blinking It may take a few minutes to blinking If the problem persists check the cable and the connector of Wi Fi interface If all else failed replace the Wi Fi interface If not improve it even if replace the Wi Fi interface replace the indoor electronic control P C...

Page 24: ...current 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 Upper lamp flashes 6 time flash 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 m...

Page 25: ...stor RT11 Indoor coil thermistor RT12 RT13 Measure the resistance with a tester 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 MV1 Horizontal Upper Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED SKY 262 3...

Page 26: ...tronic 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 s...

Page 27: ...tart 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 the ...

Page 28: ... connector 1 2 Yes Is the resistance 1MΩ or more Replace the fuse F11 and the indoor fan motor 3 No Replace the fuse F11 3 Measure the resistance of resistor R111 MSZ AP25 35 42VG K reac tor L112 MSZ AP50VG K 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 mo...

Page 29: ...ed voltage occur for 2 seconds between indoor terminal block S2 and S3 Yes No Does the upper lamp of OPERA TION INDICATOR lamp on the indoor unit blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replace the indoor electronic control P C board Yes Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Do...

Page 30: ... indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board 2 Be careful of the residual voltage of smoothing capacitor Replace the outdoor control P C board 2 Is there any 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...

Page 31: ...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 32: ...P C Board Receiver P C Board Resistor R111 MSZ AP 25 35 42VG K Reactor L112 MSZ AP50VG K Indoor fan motor CN211 325 V DC GND high voltage DC 15 V DC 3 6 V DC 0 or 15 V DC Indoor electronic control P C board Display P C board Switch buzzer P C board Fuse F11 Varistor NR11 12 V DC GND To disable Auto restart function cut the Jumper wire to JR77 Refer to 8 3 Emergency operation switch E O SW SW1 Room...

Page 33: ...minal 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 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 ...

Page 34: ...anel L toward you to remove Removing the panel F Photos 1 2 3 Figure 1 1 Remove the front panel and the horizontal vanes U L 2 Remove the panels R L 3 Remove the Wi Fi interface on the right side of the panel F Pull out its cable and remove the cable tie Refer to section 2 MSZ AP VGK 4 Remove the panel F from the bottom to the top Removing the panel U Photo 2 Figure 1 1 Remove the front panel and ...

Page 35: ...terface Photo 3 Note Install the Wi Fi interface before installing the panel R 1 Install the panel F 2 Fasten the cable of Wi Fi interface to the part of the panel F with a cable tie 3 Stow the cable of Wi Fi interface in the area 4 Attach the Wi Fi interface so that its cable is facing away from you on the right side 5 Fasten the cable of Wi Fi interface to the water cover 6 Attach the lead wire ...

Page 36: ...to 5 Indoor electronic control P C board CN151 Vane motors CN211 Indoor fan motor CN112 Indoor coil thermistors 13 Remove the electrical box Photo 4 Photo 5 4 Removing the indoor terminal P C board the switch board the display board the receiver board and the indoor electronic control P C board 1 Remove the indoor electrical box Refer to section 3 2 Remove the screw of the terminal block Photo 5 3...

Page 37: ...lectrical box 3 Remove the following connector Photo 5 Indoor electronic control P C board CN151 Vane motors 4 Pull out the drain hose from the nozzle assembly Pull and remove the nozzle assembly refer to section 5 Removing the vane motors U L horizontal Photo 6 5 Remove the 2 screws of the vane motor unit U L and remove the lead wires of the vane motors U L horizontal 6 Remove the screw of the va...

Page 38: ...e it by pulling to the right Photo 10 4 Remove the indoor coil thermistor from the heat exchanger 5 Remove the 2 screws of the hairpin holder on the left side of the heat exchanger Raise the left side of the heat exchanger and pull the line flow fan to the lower left to remove Photo 11 1 When attaching the line flow fan screw the line flow fan so 4 mm gap is provided between the right end of the l...

Page 39: ...ked 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 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape par...

Page 40: ...ICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Published Dec 2017 No OBH788 Made in Japan Specifications are subject to change without notice ...

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