Mitsubishi Electric MUH-GA20VB-E1 Service Manual Download | Manualshive

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TECHNICAL CHANGES

2

1

MUH-A07YV-

➔

MUH-GA20VB-

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

➔

kw)

2. Dimension of outdoor unit has been changed. (W780mm x H540mm x D255mm

➔

W800mm x H550mm x D285mm)

3. Stop valve cover has been added.
4. Outdoor fan motor has been changed. (RC6V20-AB

➔

RA6V21-AD)

5. Outdoor fan motor capacitor has been changed.
6. Compressor capacitor has been changed.
7. Outdoor heat exchanger has been changed. (L-BEND

➔

FLAT)

MUH-A09YV-

➔

MUH-GA25VB-

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

➔

kw)

2. Dimension of outdoor unit has been changed. (W780mm x H540mm x D255mm

➔

W800mm x H550mm x D285mm)

3. Stop valve cover has been added.
4. Outdoor fan motor has been changed. (RA6V33-FB

➔

RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.
6. Compressor capacitor has been changed.
7. Outdoor heat exchanger has been changed. (2 Row

➔

1 Row)

MUH-A12YV-

➔

MUH-GA35VB-

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

➔

kw)

2. Dimension of outdoor unit has been changed. (W780mm x H540mm x D255mm

➔

W800mm x H550mm x D285mm)

3. Stop valve cover has been added.
4. Outdoor fan motor has been changed. (RA6V33-FB

➔

RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.
6. Compressor capacitor has been changed.
7. Size of stop valve (gas) has been changed.(

[

12.7

➔

[

9.52)

8. Outdoor heat exchanger has been changed. (2 Row

➔

1 Row)

MUH-GA20VB-

➔

MUH-GA20VB-

1. Compressor has been changed. (BN092VHST

➔

KN092VDMHC)

2. Compressor capacitor has been changed.
3. Capillary tube has been changed.
4. Refrigerant filling capacity has been changed.
5. Deicer P.C. board has been changed.

MUH-GA25VB-

➔

MUH-GA25VB-

1. Compressor has been changed. (RN104VHSHT

➔

KN104VTMHC)

2. Compressor capacitor has been changed.
3. Capillary tube has been changed.
4. Refrigerant filling capacity has been changed.
5. Deicer P.C. board has been changed.

MUH-GA35VB-

➔

MUH-GA35VB-

1. Outdoor heat exchanger has been changed. (1 row

➔

2 row)

2. Refrigerant filling capacity has been changed.
3. Outdoor unit weight has been changed. (35 kg

➔

39 kg)

E3

E1

E2

E1

E2

E1

E1

E1

E1

E1

E1

E1

Revision A:

•

MUH-GA20VB-

and MUH-GA25VB-

have been added.

E2

E2

Revision B:

•

MUH-GA35VB-

has been added.

E3

OB387B-1.qxp 07.5.23 2:47 PM Page 2

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Summary of Contents for MUH-GA20VB-E1

Page 1: ...UMP AIR CONDITIONERS MUH GA20VB MUH GA25VB MUH GA35VB Wireless type Models MUH GA20VB MUH GA20VB MUH GA25VB MUH GA25VB MUH GA35VB MUH GA35VB E3 E1 E2 E1 E2 E1 SERVICE MANUAL OUTDOOR UNIT Indoor unit service manual MSC GA VB Series OB385 MSC CA VB Series OB393 MSC CB VB Series OB439 No OB387 REVISED EDITION B Please void OB387 REVISED EDITION A Revision B MUH GA35VB has been added E3 NOTE This serv...

Page 2: ...nit has been changed W780mm x H540mm x D255mm W800mm x H550mm x D285mm 3 Stop valve cover has been added 4 Outdoor fan motor has been changed RA6V33 FB RA6V33 KB 5 Outdoor fan motor capacitor has been changed 6 Compressor capacitor has been changed 7 Size of stop valve gas has been changed 12 7 9 52 8 Outdoor heat exchanger has been changed 2 Row 1 Row MUH GA20VB MUH GA20VB 1 Compressor has been c...

Page 3: ...il Model kW R h K h A A W A kW A A A W mm kg dB rpm kg cc MUH GA20VB E1 Single phase 230V 50Hz 1 800 10 21 0 25 RN092VHSHT 600 C R 3 87 C S 6 14 RA6V21 AD WHT BLK 366 BLK RED 274 800o550o285 32 47 745 1 0 65 350 NEO22 Cooling 2 3 0 9 3 00 680 99 2 76 3 22 Heating 2 5 2 86 655 100 2 62 3 62 Compressor Electrical data Fan motor Special remarks Capacity Coefficient of performance C O P Outdoor unit p...

Page 4: ...formance C O P Outdoor unit power supply Function Outdoor model MUH GA25VB E1 Single phase 230V 50Hz 1 902 10 22 0 33 RN104VHSHT 700 C R 3 40 C S 4 56 RA6V33 KB WHT BLK 215 BLK RED 307 800o550o285 32 49 855 1 0 80 350 NEO22 Cooling 2 65 1 1 3 43 785 100 3 10 3 23 Heating 3 0 3 43 785 100 3 10 3 66 MUH GA35VB E1 Single phase 230V 50Hz 1 902 10 27 0 33 RN135VHSHT 900 C R 2 79 C S 3 36 RA6V33 KB WHT ...

Page 5: ...tions Cooling DB35 WB24 Heating DB 7 WB 6 MUH GA25VB MUH GA35VB COOLING FUNCTION 49 HEATING SPL dB A LINE OUTDOOR UNIT MICROPHONE 1m 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD 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 DB35 WB2...

Page 6: ...40 Liquid refrigerant pipe joint Refrigerant pipe flared 6 35 Gas refrigerant pipe joint Refrigerant pipe flared 9 52 4 3 3 5 2 holes 10X21 MUH GA25 GA35VB REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit 350mm or more 200mm or more 100mm or more 100mm or more Open two sides of left right or rear side Drain hole 42 Unit mm OUTDOOR UNIT MUH ...

Page 7: ...OR FAN MOTOR INNER FUSE TAB20 PE N 3 TB2 N L TB1 BRN 3 2 1 CN711 CN730 BLU NR61 RT61 21S4 CN661 C65 1 2 3 SR61 SR62 CN721 T61 WHT C MC S R RED BLK C1 F61 BRN DSAR CIRCUIT BREAKER BLU POWER SUPPLY N 230V 50Hz 12V TO INDOOR UNIT CONNECTING RED BLK GRN YLW 3 52C 4 BLK WHT RED MF OUTDOOR UNIT NOTE 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing 2 ...

Page 8: ...frigerant pipe 6 35 with heat insulator Unit mm Stop valve with service port R V coil heating ON cooling OFF Flared connection Flared connection Compressor Stop valve MUH GA20VB MUH GA25VB MUH GA35VB E1 MUH GA35VB E3 OUTDOOR UNIT with heat insulator Refrigerant pipe 9 52 4 way valve Defrost thermistor RT61 Muffler Outdoor heat exchanger Capillary tube 3 0x 1 4x350 Capillary tube 3 0x 1 4x400 Check...

Page 9: ...oner under normal conditions since operating condi tions vary according to the areas where these units are installed The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve 1 GUARANTEED VOLTAGE 198 264V 2 AIR FLOW Air flow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb tem...

Page 10: ...gure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the position where air speed is high 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the sun 3 Check that the air filter is cleaned 4 Open windows and doors of room 5 Press the EMERGENCY OPERATIO...

Page 11: ...A20VB Outdoor low pressure Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor unit current A 18 32 230V 15 20 50 25 60 30 70 35 0 7 0 8 0 9 1 0 1 1 1 2 1 3 7 8 9 10 11 12 13 MUH GA25VB Outdoor low pressure Ambient temperature C Ambient humidity 15 20 50 25 60 30 70 35 1 2 4 3 18 32 230V MUH GA25VB Ambient temperature C Ambient humidity Outdoor unit current A kgf ...

Page 12: ...erature 7 15 20 C Wet bulb temperature 6 12 14 5 C 7 21 230V 5 10 15 20 25 3 4 5 6 7 21 230V 5 10 15 20 25 2 3 4 5 7 21 230V 5 10 15 20 25 2 3 4 5 Outdoor unit current A Outdoor unit current A Outdoor unit current A Ambient temperature C Ambient temperature C Ambient temperature C MUH GA20VB MUH GA25VB MUH GA35VB ...

Page 13: ... 744 2 94 0 94 0 32 765 28 18 2 70 2 27 0 84 572 2 59 2 17 0 84 601 2 48 2 09 0 84 629 2 39 2 01 0 84 658 28 20 2 82 2 03 0 72 601 2 70 1 95 0 72 636 2 62 1 89 0 72 651 2 53 1 82 0 72 679 28 22 2 93 1 76 0 60 622 2 83 1 70 0 60 661 2 76 1 66 0 60 679 2 65 1 59 0 60 708 28 24 3 08 1 48 0 48 651 2 97 1 42 0 48 686 2 90 1 39 0 48 708 2 81 1 35 0 48 744 28 26 3 17 1 14 0 36 686 3 08 1 11 0 36 722 3 04...

Page 14: ... 851 2 54 0 81 0 32 869 28 18 2 25 1 89 0 84 701 2 07 1 74 0 84 744 1 99 1 67 0 84 758 28 20 2 37 1 71 0 72 729 2 21 1 59 0 72 765 2 13 1 53 0 72 787 28 22 2 51 1 50 0 60 758 2 35 1 41 0 60 801 2 27 1 36 0 60 815 28 24 2 65 1 27 0 48 787 2 48 1 19 0 48 822 2 42 1 16 0 48 840 28 26 2 78 1 00 0 36 815 2 62 0 94 0 36 851 2 54 0 91 0 36 869 29 18 2 25 1 98 0 88 701 2 07 1 82 0 88 744 1 99 1 75 0 88 75...

Page 15: ... 853 3 39 0 95 0 28 877 28 18 3 11 2 49 0 80 656 2 98 2 39 0 80 689 2 86 2 29 0 80 722 2 76 2 20 0 80 754 28 20 3 25 2 21 0 68 689 3 11 2 12 0 68 730 3 02 2 05 0 68 746 2 92 1 98 0 68 779 28 22 3 38 1 89 0 56 713 3 26 1 83 0 56 759 3 18 1 78 0 56 779 3 05 1 71 0 56 812 28 24 3 55 1 56 0 44 746 3 42 1 50 0 44 787 3 34 1 47 0 44 812 3 23 1 42 0 44 853 28 26 3 66 1 17 0 32 787 3 55 1 14 0 32 828 3 50...

Page 16: ... 976 2 93 0 82 0 28 996 28 18 2 60 2 08 0 80 804 2 39 1 91 0 80 853 2 29 1 83 0 80 869 28 20 2 73 1 86 0 68 836 2 54 1 73 0 68 877 2 45 1 67 0 68 902 28 22 2 89 1 62 0 56 869 2 70 1 51 0 56 918 2 61 1 46 0 56 935 28 24 3 05 1 34 0 44 902 2 86 1 26 0 44 943 2 78 1 22 0 44 964 28 26 3 21 1 03 0 32 935 3 02 0 97 0 32 976 2 93 0 94 0 32 996 29 18 2 60 2 18 0 84 804 2 39 2 00 0 84 853 2 29 1 93 0 84 86...

Page 17: ...4 48 1 08 0 24 1166 28 18 4 11 3 13 0 76 872 3 94 2 99 0 76 916 3 78 2 87 0 76 959 3 64 2 77 0 76 1003 28 20 4 29 2 74 0 64 916 4 11 2 63 0 64 970 3 99 2 55 0 64 992 3 85 2 46 0 64 1036 28 22 4 46 2 32 0 52 948 4 31 2 24 0 52 1008 4 20 2 18 0 52 1036 4 03 2 09 0 52 1079 28 24 4 69 1 88 0 40 992 4 52 1 81 0 40 1046 4 41 1 76 0 40 1079 4 27 1 71 0 40 1134 28 26 4 83 1 35 0 28 1046 4 69 1 31 0 28 110...

Page 18: ...1297 3 87 0 93 0 24 1324 28 18 3 43 2 61 0 76 1068 3 15 2 39 0 76 1134 3 03 2 30 0 76 1155 28 20 3 61 2 31 0 64 1112 3 36 2 15 0 64 1166 3 24 2 07 0 64 1199 28 22 3 82 1 98 0 52 1155 3 57 1 86 0 52 1221 3 45 1 79 0 52 1243 28 24 4 03 1 61 0 40 1199 3 78 1 51 0 40 1254 3 68 1 47 0 40 1281 28 26 4 24 1 19 0 28 1243 3 99 1 12 0 28 1297 3 87 1 08 0 28 1324 29 18 3 43 2 74 0 80 1068 3 15 2 52 0 80 1134...

Page 19: ...3 06 2 91 2 76 779 812 853 3 45 3 30 3 15 828 853 894 3 81 3 66 3 51 853 877 918 4 20 4 04 3 90 869 910 943 MSC GA35VB MUH GA35VB OUTDOOR WB INDOOR 10 5 0 5 10 15 20 DB Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT CAPACITY 3 7 kW INPUT 1020 W 15 21 26 2 33 2 22 2 00 663 714 765 2 81 2 66 2 48 796 847 898 3 29 3 15 2 92 898 938 989 3 77 3 59 3 40 969 1010 1061 4 26 4 07 3 89 1030 1061 11...

Page 20: ...t the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires MUH GA20VB MUH...

Page 21: ...mistor in outdoor unit 7 time flash Cause Outdoor unit Trouble of outdoor control system Check room temperature thermistor and indoor coil thermis tor Refer to 11 5 Test point diagram and voltage Refer to Check of indoor fan motor Refer to 11 4 E Check of outdoor thermistor Replace the deicer P C board Refer to 11 4 D How to check mis wiring and serial signal error When outdoor unit doesn t work W...

Page 22: ... on the indoor electronic control P C board set to MUH type No Change the switch SW 2 2 on the indoor electronic control P C board to MUH type Yes Is there 5V DC between J205 J101 on the deicer P C board Is there 5V DC between J205 J101 on the deicer P C board Compressor MC INNER PROTECTOR MUH GA20 GA25VB 150i 5 C OPEN 90i10 C CLOSE MUH GA20 GA25VB 160i 5 C OPEN 90i10 C CLOSE MUH GA35VB 155i 5 C O...

Page 23: ...is not short circuit After 3 minutes does the unit operate in HEAT mode Ok No Is there 230V AC between CN7211 2 on the deicer P C board Replace the deicer P C board Yes Yes Yes No Replace the R V coil Turn ON the power supply and operate the indoor unit in COOL mode by pressing the EMERGENCY OPERATION switch Unit operates HEAT mode even if it is set to COOL mode w First measure the resistance of R...

Page 24: ...this mis wiring 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 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 ...

Page 25: ...n ON the power supply and press the EMERGENCY OPERATION switch Is the resistance of thermistor normal No Yes Does the unit operate 10 minutes or more Replace the deicer P C board OK Defective contact of the connector is considered Turn OFF the power supply Start When OPERATION INDICATOR lamp flashes 6 time Thermistors in the outdoor unit are abnormal ...

Page 26: ...oil 230V AC F61 Fuse 2A 250V CN661 1 2 Defrost thermistor RT61 12V DC J204 J101 R601 5 10VDC 5V DC J205 J101 Power supply input 230V AC NR61 Varistor Jumper wire for change in defrost setting JRF JRG Refer to 10 2 Defrost interval time short pin JPDS JPSG Refer to 10 1 11 5 Test point diagram and voltage ...

Page 27: ...he locking mechanism 1Slide the sleeve 2Pull the terminal while pushing the locking lever 1Hold 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 bef...

Page 28: ...n the propeller 4 Disconnect the outdoor fan motor connector 5 Remove screws fixing the fan motor 6 Remove the outdoor fan motor Photo 5 Propeller Propeller nut Screw of the outdoor fan motor Terminal cover Screws of the relay panel OPERATING PROCEDURE PHOTOS 2 Removing the deicer P C board 1 Remove the service panel and the cabinet 2 Disconnect all the connectors and the terminals on the deicer P...

Page 29: ...from the glass terminal of the com pressor 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 7 Disconnect the welded part of the discharge pipe 8 Disconnect the welded part of the suction pipe 9 Remove nuts fixing the compressor 10 Remove the compressor Photo 6 Compressor Suction pipe 4 Way valve Discharge pipe Compressor nuts ...

Page 30: ...n RoHS compliant 13 22 3 5 2 21 1 15 MUH GA20VB MUH GA25VB MUH GA35VB 4 17 14 19 20 18 13 6 7 8 9 10 11 12 16 23 This figure shows MUH GA20VB 24 13 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS ...

Page 31: ...ESSOR STOP VALVE GAS STOP VALVE LIQUID BACK PANEL BACK PANEL SERVICE PANEL DRAIN SOCKET TERMINAL BLOCK TERMINAL BLOCK 4 WAY VALVE 4 WAY VALVE COMPRESSOR CAPACITOR COMPRESSOR CAPACITOR COMPRESSOR CAPACITOR SURGE ABSORBER DEICER P C BOARD DEICER P C BOARD DEFROST THERMISTOR CONDENSER NET CONDENSER NET TOP PANEL SEPARATOR MOTOR SUPPORT R V COIL R V COIL FUSE VARISTOR CHECK VALVE CAPILLARY TUBE CAPILL...

Page 32: ...RoHS compliant 32 14 22 3 5 2 21 1 15 4 17 14 19 20 18 13 6 7 8 9 10 11 12 16 23 This figure shows MUH GA20VB 24 MUH GA20VB MUH GA25VB MUH GA35VB 14 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS ...

Page 33: ...ICER P C BOARD DEICER P C BOARD DEICER P C BOARD DEICER P C BOARD DEFROST THERMISTOR CONDENSER NET CONDENSER NET CONDENSER NET TOP PANEL SEPARATOR SEPARATOR MOTOR SUPPORT MOTOR SUPPORT R V COIL R V COIL FUSE VARISTOR CHECK VALVE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE RA6V21...

Page 34: ...34 ...

Page 35: ...35 ...

Page 36: ...No OB387 REVISED EDITION B 6 Distributed in May 2006 No OB387 REVISED EDITION A 6 Distributed in Feb 2005 No OB387 6 Made in Japan New publication effective May 2007 Specifications subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN ...

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