Mitsubishi Electric MSC-GA20VB Service Manual Download Page 2 | Manualshive

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Revision A :

• RoHS PARTS LIST has been added.

OB385A.qxp 06.5.9 7:02 PM Page 2

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Summary of Contents for MSC-GA20VB

Page 1: ...PARTS LIST 22 13 OPTIONAL PARTS BACK PAGE MSC GA20VB MSC GA25VB MSC GA35VB E1 E1 E1 SERVICE MANUAL Wireless type 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 OB386 MUH ...

Page 2: ...2 Revision A RoHS PARTS LIST has been added ...

Page 3: ...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 motor capaci...

Page 4: ...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 button TIME SE...

Page 5: ...Cooling 582 444 324 40 33 26 930 760 600 Heating 606 498 396 39 33 26 960 830 700 Electrical data Fan motor Special remarks Capacity w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w w NOTE 1 Test conditions are based on ISO 5151 Cooling Indoor DB27 C WB19 C Heating Indoor DB20 C Outdoor DB35 C WB24 C Outdoor DB7 C WB6 C Indoor Outdoor piping length 5m W Reference v...

Page 6: ...ote controller 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 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 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 H...

Page 7: ...ISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK SYMBOL C11 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 ...

Page 8: ... second It takes 3 minutes for the compressor to start operation However the starting time is shortened by short circuit of JPG and JPS How to modify the remote controller P C board Remove batteries before modification The board has a print as shown below NOTE For remodelling take out the batteries and press the OPERATE STOP ON OFF button twice or 3 times at first After finish remodelling put back...

Page 9: ...l be regarded as the remote controller for the indoor unit The indoor unit only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set The setting will be cancelled if the breaker has turned OFF or the power supply has shut down Please conduct the above setting once again after the power has restored Slide switch Type The position of the slide swi...

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: ...5VB 4 How 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 t...

Page 12: ...lash Cause Indoor unit Trouble of indoor unit control system Replace 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 outdo...

Page 13: ...rror 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 seconds Detect Ind...

Page 14: ...r fan 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...

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: ...t or disconnection of wire Make them sure Replace 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 ter...

Page 17: ...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 diag...

Page 18: ... 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 ...

Page 19: ...mbly 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: ...ng Diagram Q ty unit 1 1 2 1 2 2 1 1 Including No 3 4 5 2PCS SET 2PCS SET 1PCE SET 1PCE SET Remarks Part No No Part Name MSC GA20VB E1 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 MSC GA35VB E1 KM04F 1 W 7 2 4 MSC GA20VB MSC GA25VB MSC GA35VB 3 8 W 11 2 ACCESSORY AND REMOTE CONTROLLER 11 1 INDOOR UNIT STRUCTURAL P...

Page 21: ... BLOCK INDOOR FAN MOTOR 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 MSC GA25VB E1 MS...

Page 22: ...bol in Wiring Diagram Q ty unit 1 1 2 1 2 2 1 1 Including No 3 4 5 2PCS SET 2PCS SET 1PCE SET 1PCE SET Remarks Part No No RoHS Part Name MSC GA20VB E1 1 1 2 1 2 2 1 1 1 1 2 1 2 2 1 1 1 1 1 1 1 1 E12 749 426 E12 527 083 9 10 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER MSC GA25VB E1 MSC GA35VB E1 KM04F 1 W 7 2 4 MSC GA20VB MSC GA25VB MSC GA35VB 3 8 W 12 2 ACCESSORY AND REMOTE CONTROLLER 12 1 INDOOR U...

Page 23: ...STOR MOTOR BAND TERMINAL BLOCK INDOOR FAN MOTOR RC4V19 INDOOR FAN MOTOR RC4V19 INDOOR COIL THERMISTOR LINE FLOW FAN BEARING MOUNT BEARING MOUNT VARISTOR T3 15AL250V 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 ...

Page 24: ...r cleaning filter White bellows type AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0 01 micron from air by means of static electricity Normal life 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 ...

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