Mitsubishi Electric MUZ-GA25VA Service Manual Download Page 1 | Manualshive

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································4
2. PART NAMES AND FUNCTIONS······················8
3. SPECIFICATION·················································9
4. NOISE CRITERIA CURVES ·····························11
5. OUTLINES AND DIMENSIONS ·······················12
6. WIRING DIAGRAM ··········································13
7. REFRIGERANT SYSTEM DIAGRAM ··············19
8. PERFORMANCE CURVES ······························21
9. ACTUATOR CONTROL····································29

10. SERVICE FUNCTIONS·····································30
11. TROUBLESHOOTING ······································30
12. DISASSEMBLY INSTRUCTIONS·····················51
13. PARTS LIST······················································54
14. RoHS PARTS LIST···········································58

Wireless type
Models

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-GA25VA -

MUZ-GA25VA -

MUZ-GA25VA -

MUZ-GA25VA -

MUZ-GA35VA -

MUZ-GA35VA -

MUZ-GA25VAH -

MUZ-GA25VAH -

MUZ-GA25VAH -

MUZ-GA25VAH -

MUZ-GA35VAH -

MUZ-GA35VAH -

E2

E1

E4

E3

E2

E1

E2

E1

E4

E3

E2

E1

NOTE:
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.

HFC

utilized

R410A

Please void OB379 REVISED EDITION-B.

No. OB379

REVISED EDITION-C

Revision:C

●

MUZ-GA25VA(H)-

has been added.

E4

OUTDOOR UNIT

Indoor unit service manual

MSZ-GA•VA Series (OB378)
MSZ-CB•VA Series (OB441)

OB379 C--1qxp 07.2.1 2:25 PM Page 1

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Summary of Contents for MUZ-GA25VA

Page 1: ...ss type Models SPLIT TYPE HEAT PUMP AIR CONDITIONERS MUZ GA25VA MUZ GA25VA MUZ GA25VA MUZ GA25VA MUZ GA35VA MUZ GA35VA MUZ GA25VAH MUZ GA25VAH MUZ GA25VAH MUZ GA25VAH MUZ GA35VAH MUZ GA35VAH E2 E1 E4 E3 E2 E1 E2 E1 E4 E3 E2 E1 NOTE RoHS compliant products have G mark on the spec name plate For servicing of RoHS compliant products refer to the RoHS Parts List HFC utilized R410A Please void OB379 RE...

Page 2: ...odel 6 Wiring diagram 11 6 N Check of inverter P C board Change Change MUZ GA25VA MUZ GA25VAH MUZ GA35VA MUZ GA35VAH No change No change Revision B MUZ GA25VA H has been added 11 2 Failure mode recall function has been changed RoHS PARTS LIST has been added E3 Revision C MUZ GA25VA H has been added Solenoid valve coil has been removed MUZ GA25VA Serial No 6021351T MUZ GA25VAH Serial No 7000001T E3...

Page 3: ... capacity has been changed BTU base kW base 2 Control method between indoor and outdoor unit has been changed 3 Power supply method has been changed change to supply from outdoor unit 4 Terminal block for power supply has been added 5 Power P C board has been changed 6 Inverter P C board has been changed 7 Refrigerant circuit has been changed Compressor has been changed KNB092FAAH KNB073FDVH Speci...

Page 4: ...at of R22 some special tools and piping parts materials are required Refer to the table below 2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installation since it is more susceptible to contaminations than R22 3 For refrigerant piping use clean pressure proof parts materials specifically designed for R410A Refer to 2 Refrigerant...

Page 5: ... cylinder because the refrigerant bubbles due to high pressure and high speed vaporization No No No Yes Yes New New New Gauge manifold Charge hose Torque wrench Flare tool Flare gauge Vacuum pump adapter Electronic scale for refrigerant charging No Not Substitutable for R410A Yes Substitutable for R410A No 12 7 mm 1 Tools dedicated for the air conditioner with R410A refrigerant The following tools...

Page 6: ...ith indoor unit to the flare and the union seat surfaces 4 Air purge Do not discharge the refrigerant into the atmosphere Take care not to discharge refrigerant into the atmosphere during installation reinstallation or repairs to 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...

Page 7: ...rain socket 1 2 Quick clean kit 1 MUZ GA25VA E1 MUZ GA35VA E1 1 MUZ GA25VAH E1 MUZ GA35VAH E1 1 MUZ GA25VA E2 MUZ GA25VA E3 MUZ GA25VAH E2 MUZ GA25VAH E3 MUZ GA25VA E4 MUZ GA35VA E2 MUZ GA25VAH E4 MUZ GA35VAH E2 MUZ GA25VA MUZ GA35VA MUZ GA25VAH MUZ GA35VAH PART NAMES AND FUNCTIONS 2 ...

Page 8: ...t Running current 1 Power input 1 Power factor 1 Starting current 1 Compressor motor current 1 Fan motor current 1 Model Output Winding resistance at 20 Model Winding resistance at 20 Dimensions WOHOD Weight Sound level 1 Fan speed High Low High Med Low Fan speed regulator Refrigerant filling capacity R410A Refrigeration oil Model kW r h K h A A W A A A 1 W mm kg dB A rpm kg cc Compressor Fan moto...

Page 9: ...63A C63B C63C DB61 DB65 F61 F71 F801 F901 w1 H IPM LEV L61 R61 R831 R64A R64B TB1 TB2 X63 X64 X66 X69 21S4 SR61 21R1 26H MUZ GA25VAH MUZ GA35VA MUZ GA35VAH ETA19Z59BZ ETQ19Z71AY 620 420V D25XB60 250V 20A 250V 3 15A PS21244 A 203 10A 23 0mH 25m 5W 10 5W 3P G5NB 1a G4A 1A PS 230V 130W G5NB 1a Open 45 230V 130W G5NB 1a Open 45 45m 5W 1 element 250V 3 15A CAM MD12ME 12VDC STF 01AJ503 G5NB 1a for E1 E2...

Page 10: ... HEATING 46 46 Heating Dry bulb temperature 7 Wet bulb temperature 6 MUZ GA25VA MUZ GA25VAH 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 FAN SPEED HEATING 47 48 Test conditions Co...

Page 11: ...gerant pipe joint Refrigerant pipe flared 6 35 Gas refrigerant pipe joint Refrigerant pipe flared 9 52 4 3 3 5 2 holes 10X21 Drain hole 33 MUZ GA25 GA35VAH 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 MUZ GA25 GA35VA Unit mm M...

Page 12: ...ANSFORMER RELAY R V COIL SOLENOID VALVE COIL 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 block Connector MUZ GA25VA MUZ GA25VA MUZ GA25VA Serial No 6021350T E3 E2 E1 PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V 12 24V TO INDOOR UNIT CONNECTING WHT R64B...

Page 13: ...13 MUZ GA25VA Serial No 6021351T MUZ GA25VA E4 E3 ...

Page 14: ... COIL HEATER PROTECTOR 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 block Connector PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V 12 24V TO INDOOR UNIT CONNECTING RED BLU WHITE GRN YLW TB1 L N R64A TB2 S3 S1 S2 RED BLU WHT R64B WHT H 26H CT 3 4 NR64 NR63...

Page 15: ...15 MUZ GA25VAH Serial No 7000001T MUZ GA25VAH E4 E3 ...

Page 16: ...RMER RELAY R V COIL 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 block Connector MUZ GA35VA N 230V 230V 50Hz CIRCUIT BREAKER PE RED BLU WHITE GRN YLW TB1 POWER SUPPLY L N R64A TB2 S3 S1 TO INDOOR UNIT CONNECTING S2 RED BLU WHT R64B WHT NR63 LDE GRN 4 6 2 1 ...

Page 17: ...IL HEATER PROTECTOR 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 block Connector PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V TO INDOOR UNIT CONNECTING RED BLU WHITE GRN YLW TB1 L N R64A TB2 S3 S1 S2 RED BLU WHT R64B WHT H 26H CT 4 3 NR64 NR63 GRN DSA61...

Page 18: ... 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 block Connector RT61 RT62 RT64 RT65 CN642 CN641 CN643 2 1 2 1 3 4 1 2 F901 IC932 CN931 3 1 5 4 2 1 2 3 CN932 5 4 2 1 3 NR63 LDE GRN C N 7 2 5 4 6 C N 7 2 6 C N 7 2 7 2 3 1 CN601 4 5 TB800 POWER P C BOARD INVERTE...

Page 19: ...ER RELAY R V COIL HEATER PROTECTOR 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 block Connector PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V TO INDOOR UNIT CONNECTING RED BLU WHITE GRN YLW TB1 L N R64A TB2 S3 S1 S2 RED BLU WHT R64B WHT H 26H CT 4 3 NR64...

Page 20: ...00 Solenoid valve Ambient temperature thermistor RT65 MUZ GA25VA MUZ GA25VA MUZ GA25VAH MUZ GA25VAH E2 E1 E2 E1 Unit mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Refrigerant flow in cooling Compressor Muffler Muffler 4 way valve Refrigerant flow in heating Refrigeran...

Page 21: ... 1 4 800 Ambient temperature thermistor RT65 Capillary tube 3 0 1 4 400 Check valve MUZ GA25VA MUZ GA25VAH E4 E4 Unit mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Capillary tube 3 0 2 0 240 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heatin...

Page 22: ...GA35VAH 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 GA25VA MUZ GA25VAH MUZ GA35VA MUZ GA35VAH Calculation Xg 30g m Refrigerant piping length m 5 NOTE Refrigerant piping exceeding 7m requires additional refrigeran...

Page 23: ...ture 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 prevent direct r...

Page 24: ...0 100 150 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 19 7 18 2 16 7 15 2 13 7 12 1 10 6 9 1 24 7 22 8 20 9 19 0 17 1 15 2 13 3 11 4 Indoor air Dry bulb temperature difference degree Indoor intake air Dry bulb temperature Outdoor intake air Wet bulb temperature Outdoor intake air Wet ...

Page 25: ...nit current A MUZ GA25VA MUZ GA25VAH 2 4 6 8 10 12 14 MUZ GA35VA MUZ GA35VAH MUZ GA35VA MUZ GA35VAH Outdoor unit current A Outdoor unit current A Ambient temperature C Ambient temperature C MUZ GA25VA MUZ GA25VAH MUZ GA35VA MUZ GA35VAH 3 0 2 5 2 0 1 5 1 0 0 5 0 0 2 5 10 15 20 25 58Hz 4 0 3 5 3 0 2 5 2 0 1 5 1 0 2 5 10 15 20 25 58Hz COOL operation 1 Both indoor and outdoor unit are under the same t...

Page 26: ... 512 2 81 2 50 0 89 538 2 70 2 40 0 89 563 2 60 2 31 0 89 589 28 20 3 06 2 36 0 77 538 2 94 2 26 0 77 570 2 85 2 19 0 77 582 2 75 2 12 0 77 608 28 22 3 19 2 07 0 65 557 3 08 2 00 0 65 592 3 00 1 95 0 65 608 2 88 1 87 0 65 634 28 24 3 35 1 78 0 53 582 3 23 1 71 0 53 614 3 15 1 67 0 53 634 3 05 1 62 0 53 666 28 26 3 45 1 41 0 41 614 3 35 1 37 0 41 646 3 30 1 35 0 41 666 3 20 1 31 0 41 685 29 18 2 94...

Page 27: ... 2 08 1 85 0 89 691 28 20 2 58 1 98 0 77 653 2 40 1 85 0 77 685 2 23 1 71 0 77 723 28 22 2 73 1 77 0 65 678 2 55 1 66 0 65 717 2 38 1 54 0 65 742 28 24 2 88 1 52 0 53 704 2 70 1 43 0 53 736 2 55 1 35 0 53 768 28 26 3 03 1 24 0 41 730 2 85 1 17 0 41 762 2 68 1 10 0 41 794 29 18 2 45 2 28 0 93 627 2 25 2 09 0 93 666 2 08 1 93 0 93 691 29 20 2 58 2 09 0 81 653 2 40 1 94 0 81 685 2 23 1 80 0 81 723 29...

Page 28: ...3 25 0 86 950 3 64 3 13 0 86 994 28 20 4 29 3 17 0 74 907 4 11 3 04 0 74 961 3 99 2 95 0 74 983 3 85 2 85 0 74 1026 28 22 4 46 2 77 0 62 940 4 31 2 67 0 62 999 4 20 2 60 0 62 1026 4 03 2 50 0 62 1069 28 24 4 69 2 35 0 50 983 4 52 2 26 0 50 1037 4 41 2 21 0 50 1069 4 27 2 14 0 50 1123 28 26 4 83 1 84 0 38 1037 4 69 1 78 0 38 1091 4 62 1 76 0 38 1123 4 48 1 70 0 38 1156 29 18 4 11 3 70 0 90 864 3 94...

Page 29: ...123 2 91 2 50 0 86 1166 28 20 3 61 2 67 0 74 1102 3 36 2 49 0 74 1156 3 12 2 31 0 74 1220 28 22 3 82 2 37 0 62 1145 3 57 2 21 0 62 1210 3 33 2 06 0 62 1253 28 24 4 03 2 01 0 50 1188 3 78 1 89 0 50 1242 3 57 1 79 0 50 1296 28 26 4 24 1 61 0 38 1231 3 99 1 52 0 38 1285 3 75 1 42 0 38 1339 29 18 3 43 3 09 0 90 1058 3 15 2 84 0 90 1123 2 91 2 61 0 90 1166 29 20 3 61 2 81 0 78 1102 3 36 2 62 0 78 1156 ...

Page 30: ...3 74 851 4 16 874 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 2 52 686 3 04 823 3 56 928 4 08 1002 4 60 1066 5 08 1097 5 60 1118 21 2 40 739 2 88 876 3 40 971 3 88 1044 4 40 1097 4 88 1129 5 38 1171 26 2 16 791 2 68 928 3 16 1023 3 68 1097 4 20 1150 4 68 1182 5 20 1213 MUZ GA25VA MUZ GA25VAH Rated frequency 85Hz MUZ...

Page 31: ...tor w1 w1 w1 w1 w1 w2 w1 w1 MUZ GA35VA MUZ GA35VAH w2 MUZ GA25VA E1 E2 E3 Serial No 6021350T MUZ GA25VAH E1 E2 E3 Serial No 7000000T 9 3 Relation between main sensor and actuator 9 2 R V coil control Heating ON Cooling OFF Dry OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor ON OFF ON OFF Outdoor fan motor Compressor 5 seconds 15 seconds ON OFF Compressor Out...

Page 32: ...ts for bursting and discoloration 4 When troubleshooting refer to 11 2 11 3 and 11 4 11 1 Cautions on troubleshooting 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for mis wiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote contr...

Page 33: ...rn and confirm the abnormal point with the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles W2 Turn ON the power supply Preparation of the remote controller 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button 2 First release RESET button And relea...

Page 34: ...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 35: ...VAH 83 MUZ GA35VA MUZ GA35VAH or temperature of P C board temperature thermistor on the inverter P C board exceeds 81 MUZ GA25VA MUZ GA25VAH 85 MUZ GA35VA MUZ GA35VAH When outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up When nonvolatile memory data cannot be read properly When temperature of discharge temperature thermistor has been 50 or less for 20 minutes W...

Page 36: ...ndoor unit Trouble of indoor fan motor Left lamp 5 time flash Cause Outdoor unit Outdoor power system abnormality Left lamp 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit Left lamp 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 11 6 O How to check of mis wiring and serial signal error MUZ GA25 35 All lamps Flash on and off at 0 5 second intervals ...

Page 37: ...efrosting in COOL mode Frequency drop by discharge temperature protection Low discharge temperature protection Check stop valve Reconnect connector of compressor Refer to 11 6 A How to check inverter compressor Refer to 11 6 G Check of outdoor thermistors Check stop valve Reconnect connector of compressor Refer to 11 6 A How to check inverter compressor Replace inverter P C board Check refrigerant...

Page 38: ...ormal 333 428 Normal 1 220 1 580 Measure the resistance with a tester Part temperature 20 C 40 C MUZ GA25VA MUZ GA25VAH U V U W V W Normal 1 28 1 66 1 58 2 03 MUZ GA35VA MUZ GA35VAH MUZ GA25VA MUZ GA25VAH MUZ GA35VA MUZ GA35VAH MUZ GA25VA MUZ GA25VAH MUZ GA35VA MUZ GA35VAH MUZ GA25VA MUZ GA25VAH 2 3 W U V 1 WHT RED BLK 2 3 W U V 1 WHT RED BLK WHT RED BLK FUSE Solenoid valve coil 21R1 MUZ GA25VA E1...

Page 39: ...T RED RED WHT Judgement Infinite Normal 0 dozens of Abnormal short Output voltage 115V w Measure AC voltage between the lead wires at 3 points ohmmeter indication Normal infinite Abnormal 0 dozens of X1 X1 LED Inverter P C board Parts side 9 time flash 2 5 second OFF Flashing Check of open phase B Check of intelligent power module C How to check inverter compressor A When OPERATION INDICATOR lamp ...

Page 40: ...Test run operation Refer to 8 3 Measurement Measure the time from the start of outdoor fan running to the stop of compressor due to over current Judgement For reference 0 10 seconds Abnormal compressor short or poor contact compressor lock out 10 seconds 5 minutes Abnormal refrigerant circuit defect more than 5 minutes Normal w Measure the resistance between the lead wires at 3 points Outdoor fan ...

Page 41: ...ween CN643 1 and 2 Ambient temperature thermistor RT65 Disconnect connector CN61 between the 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 power P C board 3 minutes after the power supply is turned ON Yes No Replace the power P C board Replace the 4 way valve Replace the 4 way valve...

Page 42: ...an motor normal 3 minutes after is there voltage 230V AC between CN771 2 and 3 on the power P C board Disconnect the connector CN771 on the power P C board Disconnect the connector CN61 between compressor and power transistor module Turn ON the power supply and press the EMERGENCY OPERATION switch Yes Yes No Check the resistance of fan motor Refer to 11 5 Replace the power P C board No Replace the...

Page 43: ...0V DC Inverter P C board Solder side Is there voltage 230V AC between the indoor terminal block S1 and S2 Rectify indoor outdoor connecting wire Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up MUZ GA35VA MUZ GA35VAH 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 6 N No Yes ...

Page 44: ...nsion valve click click Do you feel the expansion valve vibrate on touching it Does the resistance of LEV have the characteristics Refer to 11 5 Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin3 Pin1 2 Pin4 Pin1 3 Pin5 Pin1 4 Pin6 Pin1 Is there about 3 5V AC between each NOTE Measure the voltage by an analog tester No Yes Yes Yes No Replace the expansion valve Y...

Page 45: ...istics Refer to 11 7 1 2 Is the resistance of defrost heater normal Refer to 11 5 3 Does the heater protector remain conducted not open 4 Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors 26H CN726 CN722 H 2 1 2 1 2 3 Outdoor base gets frozen MUZ GA25VAH MUZ GA35VAH Check of inverter P C board N Outdoor fan motor does not operate or stops immedi...

Page 46: ...n the inverter P C board Replace the inverter P C board CN931 CN932 Inverter P C board Solder side Check the corresponding parts following LED indication Refer to 11 4 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 6 I MUZ GA35VA MUZ GA3...

Page 47: ...heck the power supply A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not mis wiring Short circuit outdoor terminal block S2 and S3 W1 B Turn ON the power supply 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 outdoor ter...

Page 48: ...efer to 11 6 G Correct the connection Replace the solenoid valve Trouble of the solenoid valve or solenoid valve coil Are the connectors for solenoid valve coil firmly connected without disconnection or loose connection Does it repeat to go 0V and 230VAC at 5 second interval Correct the connection Measure the voltage between CN725 8 and 2 GND on the inverter P C board Does it repeat to go 0V and 1...

Page 49: ...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 50: ...or CN932 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 Connecting wire with power P C board CN725 Jumper wire for change in defrost setting JS Front side of unit DB61 280V 370V DC Smoothing capacitor C63C Smoothing capacitor C63A Smoothing capacitor C63B MUZ ...

Page 51: ...mperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 230V AC DB61 Connecting wire with power P C board CN725 Jumper wire for change in defrost setting JS Front side of unit DB61 280V 370V DC Smoothing capacitor C63C Smoothing capacitor C63A Smoothing capacitor C63B MUZ GA35VA MUZ GA35VAH Rotational frequency feedback signal o...

Page 52: ...UZ GA35VAH Front side of unit Connecting wire with inverter P C board CN726 230V AC MUZ GA25VA Serial No 6021350T MUZ GA25VAH Serial No 7000000T Solenoid valve coil CN923 230V AC E3 E2 E1 E3 E2 E1 MUZ GA25VA MUZ GA25VAH Output to drive outdoor Fan motor CN771 230V AC Varistor NR63 Varistor NR62 Varistor NR64 2 Power P C board FUSE F71 ...

Page 53: ... 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 can be detached by pulli...

Page 54: ...3 Ambient temperature thermistor CN724 LEV MUZ GA35VA GA35VAH 4 Remove the compressor connector CN61 5 Remove the screws fixing the relay panel See Photo 3 6 Remove the inverter assembly See Photo 3 7 Disconnect all connectors and lead wires on the inverter P C board See Photo 4 8 Remove the inverter P C board from the inverter assembly 9 Remove the screw fixing the power P C board See Photo 4 10 ...

Page 55: ...rts of 4 way valve 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 5 Detach the w...

Page 56: ...56 13 PARTS LIST non RoHS compliant 13 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 1 11 12 2 18 20 13 10 9 MUZ GA25VA MUZ GA35VA MUZ GA25VAH MUZ GA35VAH 3 4 5 6 7 8 19 17 23 21 22 24 15 14 16 ...

Page 57: ...ERVICE PANEL BACK PANEL EXPANSION VALVE EXPANSION VALVE COIL 4 WAY VALVE 4 WAY VALVE THERMO HOLDER CONDENSER WIRE NET CONDENSER NET CONDENSER NET SEPARATOR SEPARATOR MOTOR SUPPORT MOTOR SUPPORT TOP PANEL OUTDOOR HEAT EXCHANGER OUTDOOR FAN MOTOR OUTDOOR FAN MOTOR DEFROST HEATER HEATER PROTECTOR CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE SOLENOID VALVE COIL SOLENOID VALVE E02 927 232 E...

Page 58: ...2 927 385 1 2 3 4 5 6 7 8 9 10 11 12 13 Symbol in Wiring Diagram Q ty unit DEFROST DISCHARGE T20AL250V 3P 3P Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 T3 15AL250V Remarks Part No No Part Name L61 21S4 21S4 RT61 RT62 RT65 F61 TB1 TB2 F71 F801 F901 NR62 NR63 NR64 1 1 1 ...

Page 59: ...exchanger and line flow fan if you attach QUICK CLEAN KIT to your vacuum cleaner NOTE Quick clean kit has been removed from model E2 heat exchanger Symbol in Wiring Diagram Remarks Parts No Parts Name E02 927 113 E02 927 115 E02 927 112 2 3 4 BRUSH NOZZLE UNIVERSAL ADAPTER No Q ty unit 1 1 1 1 1 1 1 1 1 1 1 1 MUZ GA25VA E1 MUZ GA25VAH E1 MUZ GA35VA E1 MUZ GA35VAH E1 2 4 3 MUZ GA25VA MUZ GA35VA MUZ...

Page 60: ...60 14 RoHS PARTS LIST RoHS compliant 14 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 1 11 12 2 18 20 13 10 9 MUZ GA25VA MUZ GA35VA MUZ GA25VAH MUZ GA35VAH 3 4 5 6 7 8 19 17 23 21 22 24 15 14 16 ...

Page 61: ...S STOP VALVE LIQUID SERVICE PANEL BACK PANEL EXPANSION VALVE EXPANSION VALVE COIL 4 WAY VALVE 4 WAY VALVE THERMO HOLDER CONDENSER WIRE NET CONDENSER NET CONDENSER NET SEPARATOR SEPARATOR MOTOR SUPPORT MOTOR SUPPORT TOP PANEL OUTDOOR HEAT EXCHANGER OUTDOOR FAN MOTOR OUTDOOR FAN MOTOR DEFROST HEATER HEATER PROTECTOR CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE CHECK VALVE ...

Page 62: ...12 927 385 1 2 3 4 5 6 7 8 9 10 11 12 13 G G G G G G G G G G G G G G G G G G G G G G Symbol in Wiring Diagram Q ty unit DEFROST DISCHARGE T20AL250V 3P 3P Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 T3 15AL250V Remarks Part No No Part Name L61 21S4 21S4 RT61 RT62 RT65 F61 TB1 TB2 F71 F801 F901 NR62 NR63 NR64 1 1 1 1 1 1 1 1 1 1...

Page 63: ...A25VA MUZ GA35VA 14 3 DRAIN SOCKET Symbol in Wiring Diagram Q ty unit MUZ GA25VA Remarks Parts No Parts Name E2 MUZ GA35VA E2 E3 E4 E12 838 704 1 G DRAIN SOCKET No 1 1 1 1 RoHS 1 RoHS PARTS LIST RoHS compliant ...

Page 64: ...C ENGINEERING CO LTD Distributed in Feb 2007 No OB379 REVISED EDITION C 6 Distributed in May 2006 No OB379 REVISED EDITION B 6 Distributed in Jan 2006 No OB379 REVISED EDITION A 6 Distributed in Jan 2005 No OB379 6 Made in Japan New publication effective Feb 2007 Specifications subject to change without notice ...

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