Mitsubishi Electric MUH-GD80VB Service Manual Download Page 20

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New publication, effective Apr. 2008
Specifications subject to change without notice.

Distributed in Apr. 2008. No.OBH514 6
Made in Japan

HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Summary of Contents for MUH-GD80VB

Page 1: ... PERFORMANCE CURVES 6 9 ACTUATOR CONTROL 10 10 SERVICE FUNCTIONS 11 11 TROUBLESHOOTING 11 12 DISASSEMBLY INSTRUCTIONS 18 SERVICE MANUAL Wireless type Model MUH GD80VB E1 SPLIT TYPE HEAT PUMP AIR CONDITIONERS NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A OUTDOOR UNIT No OBH514 Indoor unit service manual MSH GD VB Series OBH513 PARTS CATALOG OBB514 ...

Page 2: ...2 TECHNICAL CHANGES 1 MUH GD80VB E1 1 New model PART NAMES AND FUNCTIONS 2 Air inlet Air outlet back and side ACCESSORIES Drain socket Drain cap 33 Drain cap 16 1 2 MUH GD80VB MUH GD80VB ...

Page 3: ... 2 Refrigerant filling capacity R410A kg 2 40 Refrigeration oil Model NEO 22 NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry bulb temperature 35 C Wet bulb temperature 24 C Heating Indoor Dry bulb temperature 20 C Wet bulb temperature 15 5 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C Indoor Outdoor piping leng...

Page 4: ...m or more if there are obstacles to both sides Open as a rule 500 mm or more if the back both sides and top are open 350 mm or more 100 mm or more Service panel Gas refrigerant pipe joint Refrigerant pipe flared 15 88 Liquid refrigerant pipe joint Refrigerant pipe flared 9 52 REQUIRED SPACE MUH GD80VB OUTLINES AND DIMENSIONS 5 Unit mm WIRING DIAGRAM 6 MUH GD80VB ...

Page 5: ...eat insulator LEV R V coil heating ON cooling OFF Muffler 100 Strainer 100 Receiver Muffler Ambient temperature thermistor RT63 Strainer 100 MAX REFRIGERANT PIPING LENGTH Piping size O D mm Refrigerant piping m Max length A Max height B Gas Liquid 30 MUH GD80VB 9 52 15 15 88 Model Indoor unit Outdoor unit Max length A Max Height difference B MAX HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE R410...

Page 6: ...r air wet dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet dry bulb temperature and the indoor outlet air wet dry bulb temperature for your reference at service How to measure the indoor air wet bulb dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as show...

Page 7: ... changed to MPa on the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 kgf Gauge Dry bulb temperature Relative humidity 20 50 25 60 30 70 MUH GD80VB Ambient temperature C Ambient humidity 18 32 70 230 V 15 20 50 25 60 30 35 5 6 7 8 9 10 11 5 6 7 8 9 10 11 Ambient temperature C Ambient humidity 18 32 70 230 V 15 20 50 25 60 30 35 10 11 12 13 14 15 16 Outdoor l...

Page 8: ... 26 0 56 2955 9 12 5 11 0 56 3021 8 80 4 93 0 56 3154 27 22 10 20 4 49 0 44 2888 9 84 4 33 0 44 3071 9 60 4 22 0 44 3154 9 20 4 05 0 44 3287 27 24 10 72 3 43 0 32 3021 10 32 3 30 0 32 3187 10 08 3 23 0 32 3287 9 76 3 12 0 32 3453 27 26 11 04 2 21 0 20 3187 10 72 2 14 0 20 3353 10 56 2 11 0 20 3453 10 24 2 05 0 20 3552 28 18 9 40 6 77 0 72 2656 9 00 6 48 0 72 2789 8 64 6 22 0 72 2922 8 32 5 99 0 72...

Page 9: ...254 7 20 4 90 0 68 3453 6 92 4 71 0 68 3519 27 20 8 24 4 61 0 56 3386 7 68 4 30 0 56 3552 7 40 4 14 0 56 3652 27 22 8 72 3 84 0 44 3519 8 16 3 59 0 44 3718 7 88 3 47 0 44 3785 27 24 9 20 2 94 0 32 3652 8 64 2 76 0 32 3818 8 40 2 69 0 32 3901 27 26 9 68 1 94 0 20 3785 9 12 1 82 0 20 3951 8 84 1 77 0 20 4034 28 18 7 84 5 64 0 72 3254 7 20 5 18 0 72 3453 6 92 4 98 0 72 3519 28 20 8 24 4 94 0 60 3386 ...

Page 10: ...ATOR CONTROL 9 MUH GD80VB 9 1 R V COIL CONTROL OUTDOOR WB C INDOOR 10 5 0 5 10 15 20 DB C Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 5 92 2327 7 14 2792 8 37 3150 9 59 3401 10 81 3616 11 94 3723 13 16 3795 21 5 64 2506 6 77 2971 7 99 3294 9 12 3544 10 34 3723 11 47 3831 12 64 3974 26 5 08 2685 6 30 3150 7 43 3473 8 65 3723 9 87 3902 11 00 4010 12 22 4117 ...

Page 11: ...llowing during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and then after con firming 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 elec...

Page 12: ... Ambient temperature thermistor RT63 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Part temperature 0 C 40 C Measure the resistance with a tester Part temperature 10 C 40 C Defrost thermistor RT61 Reference value Measure the resistance between the terminals with a tester Part temperature 10 C 40 C Color of lead wire WHT BLK BLK YLW YLW RE...

Page 13: ... Rectify the connecting wire Rectify the connecting wire Rectify the connecting wire Check the compressor Refer to 11 2 Replace the compressor contactor 52C Turn ON the power supply Yes Is there 230 V AC between 2 T1 on the compressor contactor 52C and on the outdoor terminal block Yes Replace the deicer P C board Replace the deicer P C board No Yes No No No Yes Yes Yes Operate the unit in COOL or...

Page 14: ... No After 30 seconds does outdoor fan motor stop Replace the deicer P C board Yes Ok No Is there 230 V AC between 2 T1 on the compressor contactor 52C and on the outdoor terminal block Yes Replace the compressor contactor 52C No Rectify the connecting wire Compressor and or outdoor fan motor doesn t stop Unit operates HEAT mode even if it is set to COOL mode First measure the resistance of R V coi...

Page 15: ...r wire disconnection Correct them Replace the indoor electronic control P C board Is there 230 V AC between on the outdoor terminal block No Check the outdoor power supply and connection of wiring Is there 5 V DC between J101 J401 on the deicer P C board Refer to 11 4 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...

Page 16: ...e LEV operates in full opening direction Is LEV properly fixed to the expansion valve OK Do you hear the expansion valve click click Do you feel the expansion valve vibrate on touching it Does the resistance of LEV have the characteristics on 11 2 No Yes Yes Yes No No Properly fix the LEV to the expansion valve Replace the deicer P C board NOTE After check of LEV do the undermentioned operations 1...

Page 17: ...istor RT62 Resistance kΩ 0 10 20 30 40 50 60 70 80 90 100110120 0 100 200 300 400 500 600 700 800 900 Defrost thermistor RT61 Ambient temperature thermistor RT63 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature C Resistance kΩ CN662 Discharge tem perature thermistor RT62 Refer to 11 3 CN662 Ambient temperature thermistor RT63 Refer to 11 3 LEV connector CN724 Fan motor connector CN...

Page 18: ... out Check the shape of the terminal before detaching Terminal with locking mechanism Detaching points Connector Sleeve Locking lever 1 Removing the cabinet 1 Remove the screws of the service panel 2 Remove the screws of the top panel 3 Remove the screw of the valve cover 4 Remove the service panel 5 Remove the top panel 6 Remove the valve cover 7 Remove the screws of the cabinet 8 Remove the cabi...

Page 19: ...ler fan in position by using the cut on the shaft and the mark on the propeller 3 Remove the clamp of outdoor fan motor lead wire and disconnect the outdoor fan motor connector 4 Remove the screws fixing the outdoor fan motor 5 Remove the outdoor fan motor Photo 5 Screws of the outdoor fan motor Screws of the outdoor fan motor Propeller nut 4 Removing the compressor 1 Remove the cabinet Refer to 1...

Page 20: ...r 2008 Specifications subject to change without notice Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Apr 2008 No OBH514 6 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

Page 21: ...Related Links Model Number MUH GD80VB MUH GD80VB_Declaration_of_Conformity MUH GD80_Parts_Catalog_ OBB514 MUH GD80_Service_Manual_ OBH514 ...

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