Mitsubishi Electric MS-GA50VB Service Manual Download Page 2

Page: 2 / 28

TECHNICAL CHANGES

MS-A18WV -

➔

MS-GA50VB -

MS-A24WV -

➔

MS-GA60VB -

MS-A30WV -

➔

MS-GA80VB -

1. Model name has been changed.

Indication of capacity has been changed. (BTU

➔

kW)

2. Grille design has been changed.
3. Unit size has been changed.(W 1,100mm

H 325mm

D 227mm

➔

W1,100mm

H 325mm

D 258mm)

Revision A :

• RoHS PARTS LIST has been added.

Revision B :

• Indoor heat exchanger of MS-GA80VB -

has been changed.

• PARTS LIST and RoHS PARTS LIST have been changed.

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 malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

Revision C :

• Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com-

patible with MS-GA50/60/80VB-

Revision D :

• Parts numbers of indoor fan motor and motor band have been changed.
• Some descriptions have been modified.

OB369D.qxp 12.1.13 8:47 AM Page 2

OB369D

Summary of Contents for MS-GA50VB

Page 1: ...IR CONDITIONERS MS GA50VB MS GA60VB MS GA80VB E1 E1 E1 SERVICE MANUAL Models INDOOR UNIT NOTE This service manual describes technical data of the indoor units RoHS compliant products have G mark on the spec name plate For servicing of RoHS compliant products refer to the RoHS PARTS LIST RoHS compliant Outdoor unit service manual MU GA VB Series OB370 No OB369 REVISED EDITION D Revision D Parts num...

Page 2: ...y 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 malfunction unit breakdown or accidents caused by failure to follow the instructions R...

Page 3: ...te bellows type Horizontal vane Vertical vanes Catechin air filter Remote control receiving section Catechin air filter Front panel MS GA50VB MS GA60VB MS GA80VB ACCESSORIES 1 2 3 4 5 6 7 Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 o 3 5 o 1 6 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left o...

Page 4: ...front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons 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 button Vertical vane button Indication of remote controller model...

Page 5: ... 960 850 3 10 10 KM04B Electrical data Fan motor Special remarks Capacity NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 Wet bulb temperature 19 Outdoor Dry bulb temperature 35 Wet bulb temperature 24 Indoor Outdoor piping length 5m Indoor model Function Power supply Air flow High Med Low Breaker capacity Running current Power input Power factor Fan motor current...

Page 6: ... 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 42 SPL dB A LINE High FAN SPEED OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 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 BAND CENTER FREQUENCIES Hz Test conditions Co...

Page 7: ...nected part O D Installation plate Wall hole 75 Wireless remote controller Installation plate Indoor unit Liquid line 6 35 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D Liquid line 9 52 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D for MS GA50 60VB for MS GA80VB Power supply cord Lead to right 2 0m Lead to left 1 0m MS GA50VB MS GA60VB MS GA80VB Unit mm OB369D ...

Page 8: ...TOR SOLID STATE RELAY TERMINAL BLOCK MF 1 2 3 4 5 6 PE CIRCUIT BREAKER POWER SUPPLY CORD N 230V 50Hz 12V TO OUTDOOR UNIT CONNECTING BRN BLU GRN YLW BLK GRY YLW BRN WHT RED MF 3 SR141 4 3 1 CN 121 C11 HIC1 MV1 RT13 4 3 2 1 CN112 151 CN MV2 15 RT12 RT11 111 CN CN211 NR11 ELECTRONIC CONTROL P C BOARD F11 3 N L BRN 1 2 3 CN201 MV2 BLU RED CN 101 CN 102 DISPLAY P C BOARD RECEIVER P C BOARD REMOTE CONTR...

Page 9: ... Refrigerant flow in cooling MS GA50VB 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 MS GA60VB Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 15 88 with heat insulator Flared connection Flared connection In...

Page 10: ...oor unit as shown in Table 1 After modification press the RESET button MS GA50VB MS GA60VB MS GA80VB J2 J1 Table 1 No 1 unit No 2 unit No 3 unit No 4 unit 1 unit operation No modification 2 units operation Same as at left Solder J1 3 units operation Same as at left Same as at left Solder J2 4 units operation Same as at left Same as at left Same as at left Solder both J1 and J2 How to set the remot...

Page 11: ...as the power button of the remote controller is OFF To prevent breaker OFF due 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 measu...

Page 12: ...nit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting ser vice work 2 Before servicing check that the connector and terminal are connected properly 3 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and ...

Page 13: ...oor unit Trouble of indoor fan motor MU GA80VB 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit MU GA80VB 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 9 5 D How to check mis wiring When outdoor unit does not work Check room temperature thermistor and indoor coil thermis tor Refer to 9 6 Test point diagram and voltage Refer to 9 5 A Check of indoor...

Page 14: ... P C board Refer to outdoor service manual Refer to 9 5 D How to check mis wiring 3 Indoor fan motor 7 MU GA80VB Low discharge tempera ture protection Discharge temperature has been 50 or less on cool operation Abnormal point Outdoor unit does not operate Room temperature thermistor 2 time flash 2 5 second OFF Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds dur...

Page 15: ...1 Indoor coil thermistor RT12 main RT13 sub Horizontal vane motor MV1 Vertical vane motor MV2 Motor part Sensor part Measure the resistance between the terminals with 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 Normal 282 306 Measure the resistance between the terminal with a tester P...

Page 16: ...efer to 9 6 Is the voltage approximately 4 VDC Replace the indoor electronic control P C board Replace the receiver P C board Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving part 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 operate...

Page 17: ...or 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 No Does the unit operate with the remote controller Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch Yes No Yes Turn OFF the power supply Turn OFF the power supply Varistor NR11 Indo...

Page 18: ...them Replace the indoor electronic control P C board Is there 230V AC between L N on the outdoor terminal block No Check the outdoor power supply and connection of wiring Yes No Replace the deicer P C board Yes No Make the wiring between CN730 on the deicer P C board and outdoor terminal block correct Replace the deicer P C board Yes Is there 5V DC between J101 J401 MU GA80VB on the deicer P C boa...

Page 19: ... Emergency operation switch 12 VDC Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 Resistance k Room temperature thermistor RT11 To disable Auto restart function solder the jumper wire to JR07 Refer to 8 3 MS GA80VB Indoor coil thermistor RT13 sub R132 Receiver P C board CN301 w There are 2 types of electronic control P C boards TYPE1 TYPE2 They are both compatible with ...

Page 20: ... main MS GA80VB Indoor coil thermistor RT13 sub Timer short mode point JPS JPG Refer to 8 1 Room temperature thermistor RT11 R132 To disable Auto restart function solder the jumper wire to JR07 Refer to 8 3 Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 CN301 TYPE 2 Receiver P C board MS GA50VB MS GA60VB MS GA80VB Indoor electronic control P C board OB369D ...

Page 21: ... 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 Photo 1 Photo 2 Front panel Screw of the V A clamp Indoor electronic control P C board Vane motor connector Fan motor connectors Screws of the earth wire Screws Screw of the electri cal cover R L holder Screw of the termi nal block Receiver P C board 2 Removing ...

Page 22: ...ain hose from the nozzle assembly and remove the nozzle assembly 6 Remove the screws of the vane motor and disconnect the connector 7 Remove the vane motor Screws fixing the fan motor 5 Removing the line flow fan and the indoor fan motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Rem...

Page 23: ...agram Q ty unit Including No 4 5 6 4PCS SET 3PCS SET 1PCE SET Remarks Part No No Part Name 1 2 3 4 5 6 7 8 9 1 1 1 4 3 1 2 1 1 1 1 1 4 3 1 2 1 1 1 1 1 4 3 1 2 1 1 11 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 10 8 11 12 3 E02 891 620 E02 896 620 E02 179 667 E02 138 666 E02 151 667 E02 527 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID UNION LIQUID 12 7 15 88 6 35 9 ...

Page 24: ... Diagram Q ty unit T3 15AL250V Remarks Part No No Part Name F11 NR11 MF MF MV2 MV1 RT11 TB TB RT12 RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 MS GA50 VB E1 MS GA60 VB E1 MS GA80 VB E1 AUTO RESTART Including No 16 AUTO RESTART Including No 16 AUTO RESTART Including No 16 RC4V40 Including RUBBER MOUNT ...

Page 25: ...ncluding No 4 5 6 4PCS SET 3PCS SET 1PCE SET Remarks Part No No Part Name 1 2 3 4 5 6 7 8 9 RoHS G G G G G G G G G 1 1 1 4 3 1 2 1 1 1 1 1 4 3 1 2 1 1 1 1 1 4 3 1 2 1 1 12 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 10 8 11 12 3 E12 891 620 E12 896 620 E12 179 667 E12 138 666 E12 151 667 E12 527 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID UNION LIQUID 12 7 15 88 6...

Page 26: ...t T3 15AL250V Remarks Part No No G G G G G G G G G G G G G G G G G G G G G G G G G RoHS Part Name MS GA50 VB E1 MS GA60 VB E1 MS GA80 VB E1 AUTO RESTART Including No 16 AUTO RESTART Including No 16 AUTO RESTART Including No 16 RC4V40 Including RUBBER MOUNT Including two kinds of motor bands F11 NR11 MF MF MV2 MV1 RT11 TB TB RT12 RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

Page 27: ... when it becomes dirty replace it as soon as possible Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet DO NOT reuse AIR CLEANING FILTER even if it is washed DO NOT remove or attach AIR CLEANING FILTER during unit operation Model Part No MAC 1700FT MS GA50VB MS GA60VB MS GA80VB OB369D ...

Page 28: ...ATION Distributed in Jan 2012 No OB369 REVISED EDITION D Distributed in Aug 2011 No OB369 REVISED EDITION C Distributed in May 2007 No OB369 REVISED EDITION B 6 Distributed in May 2006 No OB369 REVISED EDITION A 6 Distributed in Oct 2004 No OB369 6 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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