Mitsubishi Electric MSC-GA20VB- E1 Service Manual Download Page 3

Page: 3 / 24

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSC-GA20VB -

MSC-GA25VB -

MSC-GA35VB -

Emergency operation switch

Fan

Catechin air filter
(With deodorizer)

Air outlet

Vertical vanes

Air inlet

to Breaker

Remote control
receiving section

Display section

Air cleaning filter(option)
(white bellows type)

Front panel

Power supply cord

Panel

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Operation indicator lamp

Remote control
receiving section

TECHNICAL CHANGES

MSC-A07YV -

➔

MSC-GA20VB -

1. Indication of capacity has been changed. (BTU base

➔

kW)

2. P.C. board has been changed.
3. Air cleaning filter has been changed to optional parts.
4. Fan motor has been changed.
5. Fan motor capacitor has been changed.
6. Color of indoor unit has been changed.

MSC-A09YV -

➔

MSC-GA25VB -

1. Indication of capacity has been changed. (BTU base

➔

kW)

MSC-A12YV -

➔

MSC-GA35VB -

1. Indication of capacity has been changed. (BTU base

➔

kW)

OB385-1.qxp 05.1.26 12:34 Page 3

Summary of Contents for MSC-GA20VB- E1

Page 1: ...35VB WH E1 E1 E1 MSC GA20VB MSC GA25VB MSC GA35VB E1 E1 E1 No OB385 SPLIT TYPE AIR CONDITIONERS SPLIT TYPE HEAT PUMP AIR CONDITIONERS Indication of model name NOTE This manual describes technical data of indoor units As for outdoor units MU GA20 GA25 GA35VB refer to the service manual OB386 As for outdoor units MUH GA20 GA25 GA35VB refer to the service manual OB387 As for outdoor units MUX 2A28 2A...

Page 2: ...2 ...

Page 3: ...base kW 2 P C board has been changed 3 Air cleaning filter has been changed to optional parts 4 Fan motor has been changed 5 Fan motor capacitor has been changed 6 Color of indoor unit has been changed MSC A09YV MSC GA25VB 1 Indication of capacity has been changed BTU base kW 2 P C board has been changed 3 Air cleaning filter has been changed to optional parts 4 Fan motor has been changed 5 Fan mo...

Page 4: ...N OFF FAN TOO WARM TOO COOL VANE MODE ECONO COOL STOP START HR MIN I FEEL COOL DRY PM CLOCK AM RESET CLOCK HEAT FAN Open the front lid ON OFF TOO COOL PM AM TOO WARM Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons Indication of remote controller model is on back OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN butt...

Page 5: ... 510 420 342 36 31 25 950 820 700 MSC GA25VB E1 Single phase 230V 50Hz 10 0 17 35 90 0 17 RC4V19 JA WHT BLK 283 BLK RED 188 815O278O244 9 5 3 10 10 KP1A Cooling 474 384 306 36 31 25 900 770 650 Heating 588 456 342 39 32 25 1 050 870 700 MSC GA35VB E1 Single phase 230V 50Hz 10 0 19 40 92 0 19 RC4V19 HA WHT BLK 224 BLK RED 318 815O278O244 10 5 3 10 10 KP1A Cooling 582 444 324 40 33 26 930 760 600 He...

Page 6: ...OF HEARING FOR CONTINUOUS NOISE 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 Test conditions Cooling DB27 WB19 Heating DB20 WB MSC GA25VB E1 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 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC ...

Page 7: ...ontroller 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 MSC GA35VB E1 INDOOR UNIT 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 D...

Page 8: ...F11 MF MV SYMBOL TB T11 TRANSFORMER MF 1 2 3 4 5 6 125 CN CN 109 5 REMOTE CONTROLLER 2 3 POWER MONITOR RECEIVER P C BOARD GRN LD103 PE 12V FOR MU OR MUX TYPE FOR MUH OR MXZ A TYPE MV GRN YLW POWER SUPPLY CORD N 230V 50Hz TO OUTDOOR UNIT CONNECTING 12V 1 2 N 3 L BRN BLU BLK WHT BLU RED BRN 5 CN 151 1 2 CN202 1 2 3 CN201 LD105 CN211 ELECTRONIC CONTROL P C BOARD F11 T11 NR11 RT11 RT12 CN 112 CN 111 5...

Page 9: ...on press the RESET button 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 MSC GA20VB MSC GA25VB MSC GA35VB E1 E1 E1 Remote controller model KP1A J2 J1 How to set the remote co...

Page 10: ...T FUNCTION ON SW2 2 MUH MXZ type SW2 FRONT 1 2 1 2 IC101 CN151 SW1 CN112 CN121 L101 CN201 F11 CN202 C 1 1 C N 2 1 1 SW2 LD105 Operation If the main power 230V AC has been cut the operation settings remain After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running 8 4 MU MUX TYPE MUH MXZ TYPE SWITCH OVE...

Page 11: ...ow to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally NOTE1 If the RESET button is not pressed the remote controller may not operate correctly Insert the negative pole of the batteries first Check if the polarity of the batteries are correct HE AT FA N RESET button HE AT FA N 1 Remove the fron...

Page 12: ...lace the indoor electronic control P C board MUH GA20 GA25 GA35VB MXZ A14 A18 A26 A32WV Refer to Check of outdoor thermistor and others MUH GA20 GA25 GA35VB MXZ A14 A18 A26 A32WV Replace the deicer P C board and others Refer to 9 5 D How to check mis wiring and serial signal error When outdoor unit doesn t work W1 1 Check indoor outdoor connecting wire 2 Refer to 9 5 C Check of indoor electronic c...

Page 13: ...gerant system error When the compressor operation has been in terrupted by LEV protection continuously 5 minutes the compressor stops operation Abnormal point Outdoor unit does not run Outdoor unit does not run Outdoor unit does not run Outdoor unit does not run Outdoor unit does not run Outdoor unit does not run 2 time flash 2 5 second OFF When serial signal from outdoor unit stops for 4 to 5 sec...

Page 14: ...n motor Measure the resistance between the terminals with a tester Coil wiring temperature10 C 30 C Room temperature thermistor RT11 9 4 Trouble criterion of main parts Part name Indoor coil thermistor RT12 Indoor fan motor MF INNER FUSE 136i3 C CUT OFF Motor part Sensor part Check method and criterion Measure the resistance with a tester Part temperature 10 C 30 C Measure the voltage Power ON Fig...

Page 15: ...ntrol P C board Replace the power monitor receiver P C board No 5V or 0V DC No wCheck the remote controller is exclusive for this air conditioner C C Check of indoor electronic control P C board Check the both parts side and pattern side of indoor electronic control P C board visually Replace the fuse Is fuse F11 blown Be sure to check both fuse and varistor in any case Replace the fan motor Repla...

Page 16: ... the indoor electronic control P C board Turn ON the power supply outdoor unit Is there 230V AC between outdoor terminal block L N 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 Make the wiring between CN730 on the deicer P C board and outdoor terminal block correct Replace the deicer P C board ...

Page 17: ...ion ON OFF 2switches over MU MUX type MUH MXZ type Power supply input 230V AC Varistor NR11 Fuse F11 250V AC 3 15A Room temperature thermistor RT11 Indoor coil thermistor RT12 Timer short mode point JPG JPS Refer to 8 1 Emergency operation switch Indoor fan motor 230V AC 5V DC 12V DC Safety device of fan by horizontal vane CN1R1 R132 J23 J33 J33 J12 Power monitor receiver P C board 9 6 Test point ...

Page 18: ...r 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 electric...

Page 19: ...embly 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 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 lead cover...

Page 20: ...m Q ty unit 1 1 2 1 2 2 1 1 Including No 3 4 5 2PCS SET 2PCS SET Remarks Part No No Part Name MSC GA20VB E1 WH 1 1 2 1 2 2 1 1 1 1 2 1 2 2 1 1 1 1 1 1 1 1 E02 749 426 E02 527 083 9 10 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER MSC GA25VB E1 WH MSC GA35VB E1 WH KP1A 1 W 7 2 4 MSC GA20VB WH MSC GA25VB WH MSC GA35VB WH E1 E1 E1 3 8 W 11 2 ACCESSORY AND REMOTE CONTROLLER 11 1 INDOOR UNIT STRUCTURAL PA...

Page 21: ... RC4V19 INDOOR FAN MOTOR RC4V19 INDOOR COIL THERMISTOR LINE FLOW FAN BEARING MOUNT BEARING MOUNT VARISTOR 3 15A AUTO RESTART AUTO RESTART AUTO RESTART 3P F11 NR11 MV RT11 TB MF MF RT12 NR12 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Symbol in Wiring Diagram Q ty unit Remarks MSC GA20VB E1 WH MSC GA25VB E1 WH MSC GA35VB E1 WH In...

Page 22: ...e of AIR CLEANING FILTER is 4 months However 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 1300FT MSC GA20VB MSC GA25VB MSC GA35VB E1 E1 E1 ...

Page 23: ...23 ...

Page 24: ...RIC ENGINEERING CO LTD Distributed in Jan 2005 No OB385 6 Made in Japan New publication effective Jan 2005 Specifications subject to change without notice HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN ...

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