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Mitsubishi Electric MUZ-GC25VA, Service Manual

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Mitsubishi Electric MUZ-GC25VA Service Manual Download Page 45

45

OPERATING PROCEDURE

PHOTOS

Photo 1

1. Removing the cabinet

(1) Remove the screw fixing the service panel. (See Photo 2.)
(2) Pull down the service panel and remove it. (See Photo 2.)
(3) Disconnect the power supply and indoor/outdoor connecting wire.
(4) Remove the screws fixing the top panel. (See Photo 1.)
(5) Remove the top panel. (See Photo 1.)
(6) Remove the screws fixing the cabinet.
(7) Remove the cabinet.
(8) Remove the screws fixing the back panel.
(9) Remove the back panel.

Screws of 
the cabinet

Photo 2

Screw of the

service panel

Direction to 
remove

Hooks

Back 
panel

Service

panel

Screws of
the top panel

Screws of 
the cabinet

Screw of 
the cabinet

Screws 
of the 
top panel

12-2. MUZ-GC35VA MUZ-GC35VAH 

NOTE : Turn OFF power supply before disassembling.

OBH469--2.qxp  07.1.22 1:31 PM  Page 45

Summary of Contents for MUZ-GC25VA

Page 1: ... 13 9 ACTUATOR CONTROL 22 10 SERVICE FUNCTIONS 23 11 TROUBLESHOOTING 23 12 DISASSEMBLY INSTRUCTIONS 42 Wireless type Models SPLIT TYPE HEAT PUMP AIR CONDITIONERS MUZ GC25VA MUZ GC25VAH MUZ GC35VA MUZ GC35VAH E1 E1 E1 E1 NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH469 OUTDOOR UNIT Indoor unit service manual MSZ GC VA Series OBH468 MUZ GC25VA MUZ GC25VAH ...

Page 2: ...ose Air inlet Air outlet Drain outlet Piping Drain hose Air inlet 1 Drain socket MUZ GC25VA 1 MUZ GC35VA 1 MUZ GC25VA MUZ GC25VAH MUZ GC35VA MUZ GC35VAH MUZ GA25VA MUZ GC25VA MUZ GA25VAH MUZ GC25VAH MUZ GA35VA MUZ GC35VA MUZ GA35VAH MUZ GC35VAH E1 E3 E1 E3 E1 E3 E1 E3 1 Outdoor model has been changed ...

Page 3: ... factor 1 Total Starting current 1 Total Compressor motor current 1 Fan motor current 1 Model Output Fan motor Model Dimensions WOHOD Weight Sound level 1 Fan speed Fan speed regulator Refrigerant filling capacity R410A Refrigeration oil Model kW r h K h A A W A A A 1 Total W mm kg dB A rpm kg cc Compressor Special remarks Coefficient of performance C O P Capacity Electrical data MUZ GC35VA MUZ GC...

Page 4: ...3B C63C DB61 DB65 DB61 DB65 F61 F701 F801 F71 F801 F901 H IPM LEV L61 R61 R825 R831 PTC64 R64A R64B TB1 TB2 X61 X63 X64 X66 21S4 26H TR821 MUZ GC25VAH MUZ GC35VA MUZ GC35VAH 20A 620 420V 25A 600V T3 15AL250V 15A 600V 10A 23 0mH 10 5W STF 01AJ503 230V 130W 3A 250V Open 45 230V 138W 3A 250V Open 45 20A T20AL250V CAM MD12ME 12VDC 45m 5W 25m 5W 3P 3A 250V 20A 250V 3A 600V 500 420V 15A 600V 10A 600V T3...

Page 5: ...PL dB A LINE HEATING 46 47 MUZ GC25VA MUZ GC25VAH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 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 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION SPL dB A LINE HEATING 47 48 Test conditions Cooling Dry bulb temperature 35 Heating Dry bulb tempe...

Page 6: ... 17 5 243 Bolt pitch for installation 500 684 61 105 Handle 2 holes 10 X 16 40 Unit mm MUZ GC25VA MUZ GC25VAH MUZ GC35VA MUZ GC35VAH 10 69 800 302 5 500 Bolt pitch for installation 150 22 3 Handle 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 re...

Page 7: ...7 6 WIRING DIAGRAM MUZ GC25VA ...

Page 8: ...8 MUZ GC25VAH ...

Page 9: ...9 MUZ GC35VA ...

Page 10: ...10 MUZ GC35VAH ...

Page 11: ... coil heating ON cooling OFF Strainer 100 Ambient temperature thermistor RT65 Muffler Muffler MUZ GC25VA MUZ GC25VAH Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve with service port Capillary tube 3 0 2 0 240 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Re...

Page 12: ...C35VAH Max length A Max Height difference B Indoor unit Outdoor unit MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Max length A 20 Max Height difference B 12 Model Gas 9 52 Liquid 6 35 Piping size O D mm Refrigerant piping m MUZ GC25VA MUZ GC25VAH MUZ GC35VA MUZ GC35VAH Calculation Xg 30 g m Refrigerant piping length m 5 NOTE Refrigerant piping exceeding 7 m requires additional refrigera...

Page 13: ...bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure 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 prev...

Page 14: ...0 6 8 5 Indoor air Dry bulb temperature difference degree at Rated frequency at Rated frequency MUZ GC35VAH MUZ GC25VAH MUZ GC35VA MUZ GC25VA Outdoor intake air Wet bulb temperature 20 15 10 5 0 5 10 15 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Heating capacity Capacity correction factor 15 20 26 Indoor intake air Dry bulb temperature 20 9 19 3 17 7 16 1 14 5 12 9 11 3 9 7 8 0 6 4 27 5 25 4 23 3 21 ...

Page 15: ...orrection factors MUZ GC25VAH MUZ GC35VAH MUZ GC25VA MUZ GC35VA 0 50 100 150 Hz 0 0 0 5 1 0 1 5 0 50 100 150 Hz 0 0 0 5 1 0 1 5 0 50 100 150 Hz 0 0 0 5 1 0 1 5 2 0 0 50 100 150 Hz 0 0 0 5 1 0 1 5 2 0 0 50 100 150 Hz 0 0 0 5 1 0 1 5 0 50 100 150 Hz 0 0 0 5 1 0 1 5 0 50 100 150 Hz 0 0 0 5 1 0 1 5 2 0 0 50 100 150 Hz 0 0 0 5 1 0 1 5 2 0 8 2 Capacity and input correction by operational frequency of co...

Page 16: ...35 C A A Ambient temperature C Ambient temperature C MUZ GC25VAH MUZ GC25VA MUZ GC35VAH MUZ GC35VA Outdoor unit current 3 0 2 5 2 0 1 5 1 0 0 5 0 0 2 5 10 15 20 25 3 0 2 5 2 0 1 5 1 0 0 5 0 0 2 5 10 15 20 25 COOL operation 1 Both indoor and outdoor unit are under the same temperature humidity condition 2 Operation TEST RUN OPERATION refer to 8 3 Dry bulb temperature Relative humidity 20 50 25 60 3...

Page 17: ...0 73 592 2 85 2 08 0 73 605 2 75 2 01 0 73 632 3 19 1 94 0 61 579 3 08 1 88 0 61 615 3 00 1 83 0 61 632 2 88 1 75 0 61 658 3 35 1 64 0 49 605 3 23 1 58 0 49 638 3 15 1 54 0 49 658 3 05 1 49 0 49 692 3 45 1 28 0 37 638 3 35 1 24 0 37 672 3 30 1 22 0 37 692 3 20 1 18 0 37 712 2 94 2 61 0 89 532 2 81 2 50 0 89 559 2 70 2 40 0 89 585 2 60 2 31 0 89 612 3 06 2 36 0 77 559 2 94 2 26 0 77 592 2 85 2 19 0...

Page 18: ... 718 2 58 1 88 0 73 678 2 40 1 75 0 73 712 2 23 1 62 0 73 751 2 73 1 66 0 61 705 2 55 1 56 0 61 745 2 38 1 45 0 61 771 2 88 1 41 0 49 732 2 70 1 32 0 49 765 2 55 1 25 0 49 798 3 03 1 12 0 37 758 2 85 1 05 0 37 791 2 68 0 99 0 37 825 2 45 2 18 0 89 652 2 25 2 00 0 89 692 2 08 1 85 0 89 718 2 58 1 98 0 77 678 2 40 1 85 0 77 712 2 23 1 71 0 77 751 2 73 1 77 0 65 705 2 55 1 66 0 65 745 2 38 1 54 0 65 ...

Page 19: ...0 70 1021 4 46 2 59 0 58 935 4 31 2 50 0 58 994 4 20 2 44 0 58 1021 4 03 2 33 0 58 1064 4 69 2 16 0 46 978 4 52 2 08 0 46 1032 4 41 2 03 0 46 1064 4 27 1 96 0 46 1118 4 83 1 64 0 34 1032 4 69 1 59 0 34 1086 4 62 1 57 0 34 1118 4 48 1 52 0 34 1150 4 11 3 54 0 86 860 3 94 3 39 0 86 903 3 78 3 25 0 86 946 3 64 3 13 0 86 989 4 29 3 17 0 74 903 4 11 3 04 0 74 957 3 99 2 95 0 74 978 3 85 2 85 0 74 1021 ...

Page 20: ...2 52 0 70 1097 3 36 2 35 0 70 1150 3 12 2 18 0 70 1215 3 82 2 21 0 58 1140 3 57 2 07 0 58 1204 3 33 1 93 0 58 1247 4 03 1 85 0 46 1183 3 78 1 74 0 46 1236 3 57 1 64 0 46 1290 4 24 1 44 0 34 1226 3 99 1 36 0 34 1279 3 75 1 27 0 34 1333 3 43 2 95 0 86 1054 3 15 2 71 0 86 1118 2 91 2 50 0 86 1161 3 61 2 67 0 74 1097 3 36 2 49 0 74 1150 3 12 2 31 0 74 1215 3 82 2 37 0 62 1140 3 57 2 21 0 62 1204 3 33 ...

Page 21: ...735 2 53 810 2 94 868 3 36 910 3 74 935 4 16 960 CAPACITY 4 0 kW INPUT 1055 W 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 15 21 26 2 52 686 3 04 823 3 56 928 4 08 1002 4 60 1066 5 08 1097 5 60 1118 2 40 739 2 88 876 3 40 971 3 88 1044 4 40 1097 4 88 1129 5 38 1171 2 16 791 2 68 928 3 16 1023 3 68 1097 4 20 1150 4 68 1182 5 20 1213 MUZ GC25VA MUZ G...

Page 22: ...F interlocking with the compressor ON The fan motor turns ON 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Compressor LEV Outdoor fan motor Indoor fan motor Defrost heater R V coi...

Page 23: ...s 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 electrical parts be careful to the residual voltage of smoothing capacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on...

Page 24: ...l LCD in operation display section of the remote controller is displayed after 3 seconds Deleting the memorized abnormal condition 1After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above 2Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the in...

Page 25: ...ure mode recall function mentioned above 2Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Repair th...

Page 26: ...ermistor has been 50 or less for 20 minutes DC voltage of inverter cannot be detected normally Each phase current of compressor cannot be detected normally 14 A MUZ GC25 24 A MUZ GC35 current flow into intelligent power module IPM The open phase operation of compressor is detected The interphase short out occurs in the output of the intelligent power module IPM The compressor winding shorts out Cl...

Page 27: ...on Reconnect connector of compressor Refer to 11 5 A How to check inverter compressor Check stop valve Refer to 11 5 G Check of outdoor thermistors Reconnect connector of compressor Refer to 11 5 A How to check inverter compressor Check stop valve Replace inverter P C board Check refrigerant circuit and refrigerant amount Refer to 11 5 L Check of LEV Check around outdoor unit Check outdoor unit ai...

Page 28: ...P C board the chart of thermistor Refer to 11 7 Test point diagram and voltage 1 Inverter P C board the chart of thermistor Color of the lead wire Color of the lead wire Discharge temperature thermistor RT62 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Defrost thermistor RT61 Fin temperature thermistor RT64 Ambient temperature thermistor...

Page 29: ...s the compressor operation time more than 10 seconds No Check the refrigerant circuit Check stop valve Yes Refer to 11 5 F Check of compressor start failure MUZ GC25 MUZ GC35 C With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals Operation method St...

Page 30: ...t 0 second 10 seconds 10 minutes 1 second 2 seconds Normal Abnormal Refrigerant circuit defect closed valve Abnormal Poor contact Outdoor P C board defect disconnected connector Abnormal Compressor lock out Starting defect Abnormal IPM failure Compressor winding short Compressor starts Judgement For refrence D E Check of compressor start failure F Yes No Yes Confirm that 1 5 is normal Electrical c...

Page 31: ... compressor and intelligent power module Turn ON the power supply and press EMERGENCY OPERATION switch twice HEAT mode Is there 230V AC between CN7211 and 2 on the inverter P C board GC25 or power P C board GC35 3 minutes after the power supply is turned ON Yes No Replace the inverter P C board GC25 or power P C board GC35 Replace the 4 way valve Replace the 4 way valve Disconnect connector CN61 b...

Page 32: ...istance of fan motor Refer to 11 4 Replace the inverter P C board No Replace the outdoor fan motor MUZ GC25VA MUZ GC25VAH MUZ GC35VA MUZ GC35VAH Does the voltage between each terminal repeat 5V and 0V DC by turns Does the outdoor fan rotate smoothly Check the inverter P C board Refer to 11 5 M No Yes Yes Fixed to either 5V or 0V DC Yes No No Rotate the outdoor fan slowly by hand and measure the vo...

Page 33: ...rmal Normal resistance 5 i5 Replace the power P C board Replace the power P C board Does LED on the inverter P C board light up Check of power supply J Inverter does not operate Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION switch Check the electric parts in main circuit If light up ok If flash refer to 11 3 Is ther...

Page 34: ...e LEV to the expansion valve Replace the inverter P C board NOTE After check of LEV do the undermentioned operations 1 Turn OFF the power supply and turn ON it again 2 Press RESET button on the remote controller W1 Regardless of normal or abnormal condition a short beep is emitted once the signal is received Turn ON the power supply Preparation of the remote controller 1 While pressing both OPERAT...

Page 35: ...N931 CN932 Inverter P C board Solder side Check the corresponding parts following LED indication Refer to 11 3 Operate the outdoor unit by starting EMERGENCY OPERATION Check the connection of the connectors CN931 CN932 of outdoor fan motor If the connection is poor make it correct Check the outdoor fan motor Refer to11 5 I MUZ GC35VA MUZ GC35VAH Outdoor fan motor does not operate or stops immediat...

Page 36: ...ly Check the wiring Correct them Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20V DC between indoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage No No No Yes Yes Yes Replace the inverter P C board ...

Page 37: ...nit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this...

Page 38: ...nt temperature thermistor continue to read 5 or below and let the defrost thermistor continue to read 1 or below 3 2 1 230V AC MUZ GC25VAH MUZ GC35VAH 1 230V AC MUZ GC25VAH Inverter P C board MUZ GC35VAH Power P C board 3 2 Check the following points before checking electric continuity 1 Does the resistance of ambient temperature thermistor have the characteristics Refer to 11 6 1 2 Is the resista...

Page 39: ...Z GC25VAH 11 6 Test point diagram and voltage Back side of unit Output to drive outdoor fan motor CN771 Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 230V AC DB61 Jumper wire for change in defrost setting JS Front side of unit DB61 280V 370V DC Smoothing capacitor C62 Smo...

Page 40: ...C63B Rotational frequency feedback signal of outdoor fan motor CN931 1 2 3 45V 5GND Output to drive compressor LDW LDV LDU LED monitor lamp Connector for indoor outdoor communication CN601 1 Inverter P C board MUZ GC35VA MUZ GC35VAH FUSE F901 FUSE F801 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Ambient temperature thermistor RT65 Defrost thermistor RT61 Temperature Discharge ...

Page 41: ... MUZ GC35VAH R V coil CN721 230V AC 230V AC Back side of unit MUZ GC35VA MUZ GC35VAH Front side of unit Connecting wire with inverter P C board CN726 230V AC Varistor NR63 Varistor NR62 Varistor NR64 2 Power P C board FUSE F71 ...

Page 42: ... 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 types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism ca...

Page 43: ... CN771 Fan motor CN724 LEV CN772 Defrost heater GC25VAH 3 Disconnect the compressor connector CN61 4 Remove the screws fixing the relay panel See Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the inverter P C board from the inverter assembly Photo 3 Photo 4 Inverter assembly 4 Removing the discharge temperature thermistor and defrost thermistor 1 Remove the cabinet and panels Refer t...

Page 44: ...or and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 4 Detach the welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the welded part ...

Page 45: ...ng the top panel See Photo 1 5 Remove the top panel See Photo 1 6 Remove the screws fixing the cabinet 7 Remove the cabinet 8 Remove the screws fixing the back panel 9 Remove the back panel Screws of the cabinet Photo 2 Screw of the service panel Direction to remove Hooks Back panel Service panel Screws of the top panel Screws of the cabinet Screw of the cabinet Screws of the top panel 12 2 MUZ GC...

Page 46: ...721 4 way valve CN722 Defrost heater MUZ GC35VAH Inverter P C board CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature thermistor CN643 Ambient temperature thermistor CN724 LEV 3 Remove the compressor connector CN61 4 Remove the screws fixing the relay panel See Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the inverter P C board from the inverter assembly 7 Rem...

Page 47: ...moving the compressor and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0kg cm2 0 MPa 4 Detach the welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detac...

Page 48: ...ARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN C C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2007 No OBH469 6 Made in Japan New publication effective Jan 2007 Specifications subject to change without notice ...

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