Mitsubishi MU-GA20VB Service Manual Download Page 28

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Distributed in Jan. 2005. No.OB386 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

OB386.qxp 05.1.14 9:44 Page 28

Summary of Contents for MU-GA20VB

Page 1: ...S 21 11 PARTS LIST 24 Wireless type Models MU GA20VB MU GA25VB MU GA35VB E1 E1 E1 MU GA20VB MU GA25VB MU GA35VB E1 E1 E1 No OB386 HFC utilized R410A SPLIT TYPE AIR CONDITIONERS Indication of model name NOTE This service manual describes technical data of outdoor units As for indoor units MSC GA20VB MSC GA25VB and MSC GA35VB refer to the service manual OB385 As for indoor units MSC CA20VB MSC CA25V...

Page 2: ...e susceptible to contaminations than R22 3 For refrigerant piping use clean pressure proof parts materials specifically designed for R410A Refer to 2 Refrigerant piping 4 Composition change may occur in R410A since it is a mixed refrigerant When charging charge liquid refrigerant to prevent composition change MU A07YV MU GA20VB 1 Indication of capacity has been changed BTU base kW base 2 Unit size...

Page 3: ...e hose Torque wrench Flare tool Flare gauge Vacuum pump adapter Electronic scale for refrigerant charging No Not Substitutable for R410A Yes Substitutable for R410A 1 Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant Some R22 tools can be substituted for R410A tools The diameter of the service port on the stop valve in outdoor uni...

Page 4: ...o the refrigerant circuit Use the vacuum pump for air purging for the purpose of environmental protection 5 Additional charge For additional charging charge the refrigerant from liquid phase of the gas cylinder If the refrigerant is charged from the gas phase composition change may occur in the refrigerant inside the cylinder and the outdoor unit In this case ability of the refrigeration cycle dec...

Page 5: ...B E1 Single phase 230V 50Hz 2 3 0 9 1 800 10 3 17 715 98 21 2 76 0 245 3 22 RN092VHSHT 600 C R 3 87 C S 6 14 RA6V21 AC WHT BLK 366 BLK RED 274 800o550o285 31 45 745 1 0 60 350 NEO22 MU GA25VB E1 Single phase 230V 50Hz 10 RN092VHSHT 600 C R 3 87 C S 6 14 RA6V21 AC WHT BLK 366 BLK RED 274 800o550o285 31 45 745 1 0 60 350 NEO22 2 5 1 1 1 800 3 40 775 99 21 2 99 0 245 3 23 MU GA35VB E1 Single phase 23...

Page 6: ...R FREQUENCIES Hz Test conditions Cooling DB35 WB24 MU GA35VB E1 COOL FUNCTION 49 SPL dB A LINE OUTDOORUNIT MICROPHONE 1m 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 MU GA20VB ...

Page 7: ...ndle 550 280 164 5 99 5 170 5 23 Service panel Service port 285 344 5 44 400 Air in Air out Air in 17 5 Bolt pitch for installation 304 325 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 REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit 350mm or more...

Page 8: ... 1 2 TB2 C1 C2 WHT CIRCUIT BREAKER WHT 51C 4 1 BRN F BLU BRN WHT RED BLU WHT BLK RED POWER SUPPLY N 230V 50Hz 12V TO INDOOR UNIT CONNECTING WHT BLK DSAR 52C C R S GRN YLW BRN COM 52C NO MC 1 3 2 BLK RED WHT MF NOTE 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal bl...

Page 9: ... Air flow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb temperature CWB 2 Indoor outlet air wet bulb temperature CWB 3 Outdoor intake air dry bulb temperature CDB 4 Total input W Indoor air wet dry bulb temperature difference on the left side of the chart on next page shows the difference between the indoor intake air wet dry bulb temperature and the indoor outlet air wet dry b...

Page 10: ... f f Gauge INDOOR UNIT OUTDOOR UNIT Wet and dry bulb thermometers Wet and dry bulb thermometers MSC GA20VB E1 MU GA20VB E1 MU GA35VB E1 MSC GA35VB E1 MU GA25VB E1 MSC GA25VB E1 8 5 7 8 7 1 6 4 5 8 5 1 9 6 8 8 8 0 7 2 6 5 5 7 11 0 10 0 9 1 8 2 7 4 6 5 8 1 CAPACITY AND THE INPUT CURVES 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 15 20 50 25 60 30 70 35 1 2 4 3 18...

Page 11: ... 1 2 4 3 18 32 230V 18 32 230V 15 20 50 25 60 30 70 35 0 6 0 7 0 8 0 9 1 0 1 1 1 2 6 7 8 9 10 11 12 MU GA25VB E1 MU GA25VB E1 Outdoor low pressure Outdoor unit current A kgf F Gauge MPa Gauge kgf F Gauge MPa Gauge Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity MU GA35VB E1 MU GA35VB E1 ...

Page 12: ... 32 744 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...

Page 13: ... 32 851 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...

Page 14: ... 28 806 3 20 0 90 0 28 829 28 18 2 94 2 35 0 80 620 2 81 2 25 0 80 651 2 70 2 16 0 80 682 2 60 2 08 0 80 713 28 20 3 06 2 08 0 68 651 2 94 2 00 0 68 690 2 85 1 94 0 68 705 2 75 1 87 0 68 736 28 22 3 19 1 79 0 56 674 3 08 1 72 0 56 717 3 00 1 68 0 56 736 2 88 1 61 0 56 767 28 24 3 35 1 47 0 44 705 3 23 1 42 0 44 744 3 15 1 39 0 44 767 3 05 1 34 0 44 806 28 26 3 45 1 10 0 32 744 3 35 1 07 0 32 783 3...

Page 15: ... 28 922 2 76 0 77 0 28 942 28 18 2 45 1 96 0 80 760 2 25 1 80 0 80 806 2 16 1 73 0 80 822 28 20 2 58 1 75 0 68 791 2 40 1 63 0 68 829 2 31 1 57 0 68 853 28 22 2 73 1 53 0 56 822 2 55 1 43 0 56 868 2 46 1 38 0 56 884 28 24 2 88 1 27 0 44 853 2 70 1 19 0 44 891 2 63 1 16 0 44 911 28 26 3 03 0 97 0 32 884 2 85 0 91 0 32 922 2 76 0 88 0 32 942 29 18 2 45 2 06 0 84 760 2 25 1 89 0 84 806 2 16 1 82 0 84...

Page 16: ...5 4 42 1 06 0 24 1198 28 18 4 05 3 08 0 76 896 3 88 2 95 0 76 941 3 73 2 83 0 76 986 3 59 2 73 0 76 1030 28 20 4 23 2 70 0 64 941 4 05 2 59 0 64 997 3 93 2 52 0 64 1019 3 80 2 43 0 64 1064 28 22 4 40 2 29 0 52 974 4 24 2 21 0 52 1036 4 14 2 15 0 52 1064 3 97 2 06 0 52 1109 28 24 4 62 1 85 0 40 1019 4 45 1 78 0 40 1075 4 35 1 74 0 40 1109 4 21 1 68 0 40 1165 28 26 4 76 1 33 0 28 1075 4 62 1 29 0 28...

Page 17: ...4 1333 3 81 0 91 0 24 1361 28 18 3 38 2 57 0 76 1098 3 11 2 36 0 76 1165 2 98 2 27 0 76 1187 28 20 3 55 2 27 0 64 1142 3 31 2 12 0 64 1198 3 19 2 04 0 64 1232 28 22 3 76 1 96 0 52 1187 3 52 1 83 0 52 1254 3 40 1 77 0 52 1277 28 24 3 97 1 59 0 40 1232 3 73 1 49 0 40 1288 3 62 1 45 0 40 1316 28 26 4 17 1 17 0 28 1277 3 93 1 10 0 28 1333 3 81 1 07 0 28 1361 29 18 3 38 2 70 0 80 1098 3 11 2 48 0 80 11...

Page 18: ...h the remote controller and then after confirming the horizontal vane is closed turn off the breaker and or disconnect 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 c...

Page 19: ...erature indoor coil thermistor 3 time flash Cause Indoor unit Trouble of indoor fan motor Check room temperature thermistor and indoor coil thermis tor Refer to Test point diagram and voltage Refer to Check of indoor fan motor 1 Check indoor outdoor connecting wire 2 Refer to Check of indoor electronic control P C board Outdoor unit doesn t stop even if indoor unit stops Check of wiring diagram of...

Page 20: ... R C S Abnormal Open or short circuit MU GA35VB Abnormal Open or short circuit MU GA35VB P INNER PROTECTOR Color of lead wire 9 3 Trouble criterion of main parts A A Check of MU MUX TYPE MUH MXZ TYPE SWITCH OVER Start Turn OFF the power supply indoor outdoor unit Set switch SW2 2 on the indoor electronic control P C board to MU type w1 Does the unit operate OK Yes No Refer to the Instruction of tr...

Page 21: ...f the cabinet Photo 2 Screw of the front panel and motor support 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the 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 t...

Page 22: ...nd disconnect the outdoor fan motor connector 5 Remove screws fixing the fan motor 6 Remove the outdoor fan motor Photo 5 Propeller nut Screws of the outdoor fan motor Outdoor fan motor Hook Outdoor fan motor connector Propeller Outdoor fan capacitor C2 Compressor capacitor C1 Surge absorber DSAR 2 Removing the electrical parts 1 Remove the service panel and the cabinet Refer to 1 2 Remove the fol...

Page 23: ...inal cover on the compressor 5 Disconnect lead wires 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 Glass terminal Compres...

Page 24: ...24 PARTS LIST 11 19 5 6 9 10 8 4 11 18 3 16 11 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS MU GA20VB MU GA25VB MU GA35VB E1 E1 E1 2 1 17 15 14 12 7 13 20 ...

Page 25: ...R OUTDOOR FAN MOTOR PROPELLER CABINET CABINET GRILLE OUT BASE BASE COMPRESSOR RUBBER SET COMPRESSOR RUBBER SET COMPRESSOR COMPRESSOR STOP VALVE GAS STOP VALVE LIQUID BACK PANEL BACK PANEL SERVICE PANEL TERMINAL BLOCK TERMINAL BLOCK OUTDOOR FAN CAPACITOR OUTDOOR FAN CAPACITOR COMPRESSOR CAPACITOR COMPRESSOR CAPACITOR CONDENSER NET CONDENSER NET MOTOR SUPPORT TOP PANEL SEPARATOR FUSE FUSE HOLDER COM...

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Page 28: ...RIC ENGINEERING CO LTD Distributed in Jan 2005 No OB386 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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