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Mitsubishi Electric MS-GE50VB-E1 Service Manual Download Page 33

33

DISASSEMBLY INSTRUCTIONS

11

(1)  Slide the sleeve and check if there is a locking lever or not.

(2)  The terminal with this connector has the locking
      mechanism.

   Slide the sleeve.
   Pull the terminal while 
   pushing the locking
   lever.

   Hold the sleeve, and 
   pull out the terminal 
   slowly.

The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

11-1. MSC-GE20VB  MSC-GE25VB  MSC-GE35VB 

NOTE: 

Turn OFF power supply before disassembly.

OPERATING PROCEDURE

PHOTOS

1. Removing the front panel

(1) Remove the screw caps of the front panel.
     Remove the screws.
(2) Pull the panel down to your side slightly and unhook the 

catches at the top.

2. Removing the electronic control P.C. board and the 

power monitor, receiver P.C. board

NOTE

 

:

 In case of removing only indoor electronic control        

 

P.C. board, work (3) is not necessary.

(1) Remove the front panel. (Refer to 1.)
(2) Remove the power monitor, receiver P.C. board holder 

from the bottom of electrical box.

(3) Open the power monitor, receiver P.C. board holder and 

remove the power monitor, receiver P.C. board.

(4) Remove the screw of the electrical cover and the electrical 

cover.

(5) Remove the screw of the V.A. clamp and the V.A. clamp.
(6) Remove the screw of the cord clamp and the cord clamp.
(7) Remove the screw of the terminal block.
(8) Remove the screw of the earth wire.
(9) Pull out indoor electronic control P.C. board slightly.
(10) Disconnect all the connectors on the electronic control P.C. 

board.

(11) Remove the electronic control P.C. board and the power 

monitor, receiver P.C. board.

Photo 2

Photo 1

Terminal block
fixing screw

Screw of the V.A.
clamp

Indoor electronic 
control P.C. board

Screws of the front panel

Screw of the
earth wire

Power monitor, receiver 
P.C. board holder 

Screw of the

electrical cover 

Cord clamp fixing
screw

OBH529A

Summary of Contents for MS-GE50VB-E1

Page 1: ...B E1 MS GE50VB E1 MSH GE50VB E1 SPLIT TYPE AIR CONDITIONERS SERVICE MANUAL Models INDOOR UNIT NOTE RoHS compliant products have G mark on the spec name plate Outdoor unit service manual MU GA VB Series OB386 MUH GA VB Series OB387 MUX A VB Series OB384 MXZ A WV Series OB319 MU MUH GE VB Series OBH530 No OBH529 REVISED EDITION A PARTS CATALOG OBB529 Revision A Another type of the electronic control...

Page 2: ... section When the front panel is opened Remote controller Operation indicator lamp Remote control receiving section Catechin air filter MSC GE20VB MSC GE25VB MSC GE35VB 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 manu...

Page 3: ... bellows type Horizontal vane Vertical vanes Catechin air filter Remote control receiving section Panel ACCESSORIES Installation plate Installation plate fixing screw 4 25 mm Remote controller holder Fixing screw for 3 5 1 6 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping 1 7 1 2 2 1 1 MS GE50VB MSH GE50VB 1 5 1 2 2 1 1 MSC GE20VB M...

Page 4: ...pacity 10 10 A W A mm kg dB rpm MSH GE50VB Cooling Single phase 230 V 50 Hz 0 3 60 87 0 3 RC4V32 BA 1 100 325 258 16 5 42 38 34 3 KM04B MS GE50VB Breaker capacity Running current Power input Power factor Model Fan motor current Dimensions W H D Weight Air direction Air flow High Med Low Sound level High Med Low Fan speed High Med Low Fan speed regulator Remote controller model A A W A mm kg m3 h d...

Page 5: ...30 NC 20 NC 10 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 Heating Dry bulb temperature 20 Wet bulb temperature MSC GE25VB COOLING High FUNCTION FAN SPEED 36 HEATING 39 SPL dB A LINE 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 10 NC...

Page 6: ...ulb temperature 20 Wet bulb temperature COOLING FUNCTION FAN SPEED 42 HEATING High SPL dB A LINE MSH GE50VB INDOOR UNIT WALL MICROPHONE 0 8m 1m 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 10 NC 70 BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MIC...

Page 7: ... 162 19 58 81 5 81 5 41 2 5 42 271 231 5 4 5 81 5 133 5 326 326 Wall hole 65 Indoor unit Installation plate Unit mm 244 242 218 5 258 81 5 81 5 41 42 2 5 17 5 161 5 161 5 326 326 5 7 or more 90 110 30 149 606 278 60 815 783 Power supply cord Lead to right 1 0m Lead to left 0 3m Air out Indoor unit Installation plate Wall hole 65 Installation plate Insulation 28 Drain hose 16 Connected part O D Liq...

Page 8: ...ir in Insulation 28 Drain hose 16 Connected part O D Installation plate Wall hole 75 Wireless remote controller Installation plate Indoor unit Liquid line 6 35 0 5 m Gas line 12 0 43 m Insulation 50 O D 32 I D Power supply cord Lead to right 2 0 m Lead to left 1 0 m MS GE50VB MSH GE50VB Unit mm OBH529A ...

Page 9: ...9 WIRING DIAGRAM 6 MS GE50VB MSH GE50VB MSC GE20VB MSC GE25VB MSC GE35VB OBH529A ...

Page 10: ...onnection Refrigerant pipe 6 35 with heat insulator MS GE50VB MSH GE50VB Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 12 7 with heat insulator Flared connection Flared connection Indoor coil thermistor RT12 Refrigerant pipe 6 35 with heat insulator Distributor Refrigerant flow in cooling Refrigerant flow in heating MSC MSH MSC GE20VB MSC GE25VB MSC GE35VB OBH529A ...

Page 11: ...2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press the RESET button How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit will only accept the signal fro...

Page 12: ...0VB MSC GE25VB MSC GE35VB 8 4 MU MUX TYPE MUH MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION 1 2 1 2 SW2 SW2 Outdoor unit MUH MXZ type Set switch downside Outdoor unit MU MUX type Set switch upside NOTE If the indoor outdoor connecting wire is incorrectly connected on the terminal block the unit does not operate normally If the earth is incorrect it may cause an electric shock How to switch over M...

Page 13: ...e to the rush of starting current systematize other home appliances not to turn ON at the same time When some air conditioners are connected 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...

Page 14: ...SET button ECONO COOL button VANE CONTROL button CLOCK SET button ON OFF FAN TOO WARM TOO COOL VANE MODE ECONO COOL STOP START HR MIN WIDE VANE LONG I FEEL COOL DRY PM CLOCK AM RESET CLOCK OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE button Horizontal vane button CLOCK SET button LONG butt...

Page 15: ... of the indicator Lighted Not lighted MSH GE50VB HEAT ON OFF FAN TOO WARM TOO COOL VANE MODE ECONO COOL STOP START HR MIN WIDE VANE LONG I FEEL COOL DRY PM CLOCK AM RESET CLOCK OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE button Horizontal vane button CLOCK SET button LONG button WIDE VANE...

Page 16: ...or unit turns ON with a beep tone 2 Select FAN mode with OPERATION SELECT button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the room temperature is low or when defrosting is being done the indoor fan will stop or rotate in Very ...

Page 17: ...17 MUH MUH OBH529A ...

Page 18: ... vane position is set to Upward To confirm the standard position the vane moves until it touches the vane stopper Then the vane is set to the desired angle in the following case In FAN operation MU MUX MUH VANE CONTROL or VANE VANE CONTROL or VANE MUH OBH529A ...

Page 19: ... As a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL VANE CONTROL VANE or LONG button MS GE50 MSH GE50 To cancel this operation press one of the following buttons ECONO COOL button in COOL mode VANE or LONG button MSH To confirm the standard position the vane moves until it touches the vane stoppe...

Page 20: ...20 MSH 9 7 TIMER OPERATION OBH529A ...

Page 21: ...te controller In case of latter normal operation will start or twice MUH or the unit the test run or the The indoor fan runs at High speed and the temperature control does not work 9 9 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute time delay function operates to protect compressor form overload OBH529A ...

Page 22: ...move the front lid and insert batteries Then reattach the front lid Lead wiring Housing point Incorrect Correct MSC GE20VB MS GE50VB MSC GE25VB MSH GE50VB MSC GE35VB RESET button Insert the negative pole of the batteries first Check if the polarity of the batteries is correct Press RESET button with a thin instrument and then use the remote controller NOTE1 If the RESET button is not pressed the r...

Page 23: ...ctronic control P C board Refer to outdoor unit service manual 1 Check indoor outdoor connecting wire 2 Refer to 10 5 Check of indoor electronic control P C board Outdoor unit does not stop even if indoor unit stops MUH MXZ Unit does not operate normal operation in COOL or HEAT mode MU Check of wiring diagram of outdoor unit MUH Refer to Check of outdoor unit Refer to Check of R V coil 2 Test run ...

Page 24: ...onic control P C board 6 time flash 2 5 second OFF Outdoor unit does not operate Outdoor unit does not operate 6 The operation mode of each indoor unit is differently set to COOL includes DRY and HEAT at same time the operation mode of indoor unit that has operated at first has the priority Unify the operation mode 9 MXZ Outdoor refrigerant system error The compressor operation has been interrupte...

Page 25: ... a tester Part temperature 10 C 30 C Color of lead wire BRN YLW YLW GRY Normal 4 5 5 5V Measure the voltage power ON When fan revolved one time 0V 5V 0V Approx MS GE50VB MSH GE50VB 283 Ω 306 Ω Normal 240 Ω 260 Ω MSC GE20 25 35VB Measure the resistance between the terminal with a tester Part temperature 10 C 30 C MAIN AUX FUSE BLK RED WHT GRY YLW BRN MSC GE20 25VB 271 Ω 295 Ω 180 Ω 196 Ω MS GE50VB ...

Page 26: ...e voltage approximately 4 V DC Yes 0 or No others Yes No Yes No Is LCD display on the remote con troller visible Remove the batteries then set them back and press the RESET button Check if the unit operates with the remote controller Yes Does the unit operate with the remote controller Yes OK Yes No No No 5 V or 0 V DC No Resolder it Reconnect the lead wires Repair or replace the indoor fan motor ...

Page 27: ...the varistor Yes Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply No Does the unit operate with the remote controller Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch Yes No Turn OFF the power supply Turn OFF the power supply Varistor NR11 I...

Page 28: ... poor contact or disconnection of wire Correct them Replace the indoor electronic control P C board Turn ON the power supply outdoor unit Is there 230V AC between outdoor terminal block TB1 No Check the outdoor power supply power supply cord and connection Yes Turn ON the power supply indoor unit No Replace the deicer P C board Yes No Correct the wiring between CN730 on the deicer P C board and ou...

Page 29: ...door connecting wire 1 Turn OFF the power supply indoor outdoor unit and disconnect indoor and outdoor connecting wire on indoor side 2 Short circuit terminal block N 3 by lead wire 3 Turn ON the power supply indoor unit and press EMERGENCY OPERATION switch once Turn ON the power supply outdoor unit Is there 230 V AC between outdoor terminal block TB1 No Check the outdoor power supply and connecti...

Page 30: ...X type MUH MXZ type Power supply input 230 V AC Varistor NR11 Fuse F11 T3 15AL 250V Room temperature thermistor RT11 Indoor coil thermistor RT12 Timer short mode point JPG JPS Refer to 8 1 Emergency operation switch 5 V DC 12 V DC Safety device of fan by horizontal vane CN1R1 R132 J23 J33 J33 J12 Power monitor receiver P C board 10 6 TEST POINT DIAGRAM AND VOLTAGE Vane moter power supply CN151 CN1...

Page 31: ... 1 Emergency operation switch 12V DC Indoor coil thermistor RT12 Room temperature thermistor RT11 Resistance kΩ Room temperature thermistor RT11 To disable Auto restart function solder jumper wire to JR07 Refer to 8 4 2 R132 Receiver P C board TYPE 1 Vane moter power supply CN151 CN121 CN301 NOTE There are two types of electronic control P C boards TYPE 1 TYPE 2 They are both compatible with MS MS...

Page 32: ...JPG Refer to 8 1 Emergency operation switch CN121 Room temperature thermistor RT11 R132 To disable Auto restart function solder jumper wire to JR07 Refer to 8 4 2 Vane motor power supply CN151 12 VDC Indoor coil thermistor RT12 Room temperature thermistor RT11 Power supply input CN301 TYPE 2 MS GE50VB MSH GE50VB Indoor electronic control P C board OBH529A ...

Page 33: ...ving the electronic control P C board and the power monitor receiver P C board NOTE In case of removing only indoor electronic control P C board work 3 is not necessary 1 Remove the front panel Refer to 1 2 Remove the power monitor receiver P C board holder from the bottom of electrical box 3 Open the power monitor receiver P C board holder and remove the power monitor receiver P C board 4 Remove ...

Page 34: ...y remove the nozzle assembly 4 Remove the screws of the vane motor disconnect the vane motor connector 5 Remove the vane motor 5 Removing the indoor fan motor and the line flow fan 1 Remove the front panel the corner box Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly remove the nozzle assembly Refer to 4 4 Remove the screw of the lead cover and...

Page 35: ... 4 Remove the screw of the terminal block 5 Remove the screws of the earth wire 6 Disconnect all the connectors and all the lead wires on the electronic control P C board 7 Remove the R L holder 8 Remove the electronic control P C board 9 Open the R L holder remove the receiver P C board and the display P C board Screws of the earth wire 3 Removing the electrical box 1 Remove the panel and the cor...

Page 36: ...de the hole cover and remove the hole cover 6 Remove the hexagon socket set screw from the line flow fan 7 Remove the screws of the fan motor and remove the fan motor Be careful not to drop the fan motor because it is heavy 8 Remove the screws of the left side of the heat exchanger 9 Lift the left side of the heat exchanger 10 Remove the line flow fan Screws of the left side of the heat exchanger ...

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