Mitsubishi Electric MUZ-GE25VA Service Manual Download Page 1

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVES ······························ 7

5. OUTLINES AND DIMENSIONS ························ 9

6. WIRING DIAGRAM ···········································11

7. REFRIGERANT SYSTEM DIAGRAM ············· 18

8. PERFORMANCE CURVES ····························· 21

9. ACTUATOR CONTROL ··································· 40

10. SERVICE FUNCTIONS ···································· 41

11. TROUBLESHOOTING ····································· 41

12. DISASSEMBLY INSTRUCTIONS ···················· 61

Models

SPLIT-TYPE AIR CONDITIONERS

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

HFC

utilized

R410A

No. OBH516

REVISED EDITION-C

OUTDOOR UNIT

Indoor unit service manual
MSZ-GE•VA Series (OBH515)
MSZ-CGE•VA Series (OBH523)

PARTS CATALOG (OBB516)

MUZ-GE25VA

MUZ-GE35VA

MUZ-GE42VA

Revision C:

•

The compressor winding resistance for
MUZ-GE71VA -

has been changed.

Please void OBH516 REVISED EDITION-B.

MUZ-GE25VA -

MUZ-GE50VA -

MUZ-GE25VAH -

MUZ-GE50VAH -

MUZ-GE35VA -

MUZ-GE60VA -

MUZ-GE35VAH -

MUZ-GE71VA -

MUZ-GE42VA -

MUZ-GE42VAH -

Summary of Contents for MUZ-GE25VA

Page 1: ...TYPE AIR CONDITIONERS NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH516 REVISED EDITION C OUTDOOR UNIT Indoor unit service manual MSZ GE VA Series OBH515 MSZ CGE VA Series OBH523 PARTS CATALOG OBB516 MUZ GE25VA MUZ GE35VA MUZ GE42VA Revision C The compressor winding resistance for MUZ GE71VA E1 has been changed Please void OBH516 REVISED EDITION B MUZ GE2...

Page 2: ...UZ GE42VA E1 MUZ GE42VAH E1 MUZ GE50VA E1 and MUZ GE50VAH E1 have been added Revision B MUZ GE60VA E1 and MUZ GE71VA E1 have been added Revision C The compressor winding resistance for MUZ GE71VA E1 has been changed ...

Page 3: ...3 MUZ GE25VA E1 MUZ GE25VAH E1 MUZ GE35VA E1 MUZ GE35VAH E1 MUZ GE42VA E1 MUZ GE42VAH E1 MUZ GE50VA E1 MUZ GE50VAH E1 MUZ GE60VA E1 MUZ GE71VA E1 1 New model TECHNICAL CHANGES 1 ...

Page 4: ...GE42VA MUZ GE42VAH MUZ GE50VA MUZ GE50VAH Piping Air outlet Air inlet back and side Drain hose Drain outlet GE50VA PART NAMES AND FUNCTIONS 2 ACCESSORIES Model MUZ GE25 35 42VA MUZ GE50VA MUZ GE60 71VA Drain socket 1 1 1 Drain cap 2 MUZ GE60VA MUZ GE71VA Piping Air outlet Drain outlet Air inlet back and side Drain hose ...

Page 5: ...98 6 32 6 44 8 07 Refrigeration oil Model cc 320 NEO22 450 NEO22 350 FV50S 400 FV50S Fan motor Model RC0J50 DB RC0J50 EA RC0J60 AA RC0J60 BC Current 1 Cooling A 0 24 0 35 0 32 0 84 0 83 Heating 0 27 0 31 0 32 0 93 0 82 Dimensions W H D mm 800 550 285 840 850 330 840 880 330 Weight kg 30 33 36 54 50 53 Special remarks Dehumidification Cooling h 0 2 0 9 1 4 1 8 2 3 Air flow 1 Cooling High m3 h 3 492...

Page 6: ... V 130 W 230 V 130 W 230 V 120 W Intelligent power module IC932 5 A 600 V IPM 15 A 600 V 20 A 600 V Expansion valve coil LEV 12 V DC Reactor L61 18 mH 23 mH L 340 μH Power factor controller PFC 20 A 600 V Current detecting resistor R61 45 mΩ 5 W 1 element 100 mΩ 5 W 2 elements R61 R62 180 mΩ 5 W 2 elements R825 25 mΩ 5 W R937 R938 R939 430 mΩ 2 W R937A R937B 1 1 Ω 2 W Current limiting PTC thermist...

Page 7: ... FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 47 48 NC 10 MUZ GE35VA MUZ GE35VAH 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 0dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 50 NC 10 51 MUZ GE42VA MUZ GE42VAH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 40...

Page 8: ...4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 55 NC 10 55 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 0dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATIN...

Page 9: ... ø9 52 4 3 3 5 2 holes 10 X 21 REQUIRED SPACE 100 mm or more 350 mm or more 200 mm or more 100 mm or more 100 mm or more Drain hole ø42 MUZ GE25 35 42VA Drain hole ø33 MUZ GE25 35 42VAH MUZ GE50VA MUZ GE50VAH OUTLINES AND DIMENSIONS 5 3 0 3 5 155 90 198 40 515 299 66 34 51 330 360 850 430 500 80 121 840 Service panel Gas refrigerant pipe joint Refrigerant pipe flared ø12 7 Liquid refrigerant pipe ...

Page 10: ...0 109 81 880 452 Service panel 99 5 164 5 195 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 6 35 MUZ GE60VA Ø 9 52 MUZ GE71VA Gas refrigerant pipe joint Refrigerant pipe flared Ø 15 88 350 mm or more 100 mm or more REQUIRED SPACE 500 mm or more 100 mm or more 500 mm or more Unit mm ...

Page 11: ...11 MUZ GE25VA MUZ GE35VA WIRING DIAGRAM 6 ...

Page 12: ...12 MUZ GE25VAH MUZ GE35VAH ...

Page 13: ...13 MUZ GE42VA ...

Page 14: ...14 MUZ GE42VAH ...

Page 15: ...15 MUZ GE50VA ...

Page 16: ...16 MUZ GE50VAH ...

Page 17: ...17 MUZ GE60VA MUZ GE71VA ...

Page 18: ...0 Outdoor heat exchanger temperature thermistor RT68 Muffler REFRIGERANT SYSTEM DIAGRAM 7 Unit mm MUZ GE35VA MUZ GE35VAH MUZ GE42VA MUZ GE42VAH 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 4 way valve Refrigerant flow in heating Re...

Page 19: ...Receiver Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Unit mm MUZ GE60VA Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube ø4 0 ø2 4 100 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Ref...

Page 20: ...ed Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ GE60 1 550 0 0 100 200 300 400 Calculation X g 20 g m Refrigerant piping length m 10 Model Outdoor unit precharged Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ GE71 1 900 0 0 275 550 825 1 100 Calculation X g 55 g m Refrigerant piping length m 10 NOTE Refrigerant piping exceeding 7 m requires additional ref...

Page 21: ...he 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 OPERATION switch once twice to start the EMERGENCY COOL HEAT MODE 6 Wh...

Page 22: ...6 9 15 3 13 8 12 3 10 7 9 2 7 7 6 1 25 3 23 4 21 4 19 5 17 5 15 6 13 6 11 7 9 7 7 8 MUZ GE50VA MUZ GE50VAH MUZ GE42VA MUZ GE42VAH MUZ GE35VA MUZ GE35VAH MUZ GE25VA MUZ GE25VAH Outdoor intake air Wet bulb temperature C 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 at Rated frequency Capacity correction factor 15 20 26 MUZ GE71VA MUZ GE60VA Indoor intake air Dry bulb ...

Page 23: ... 100 0 0 0 5 1 0 1 5 0 50 100 0 0 0 5 1 0 1 5 0 50 100 0 0 0 5 1 0 1 5 0 50 100 0 0 0 5 1 0 1 5 2 0 0 50 100 Correction of Cooling capacity 0 0 0 5 1 0 1 5 0 50 100 The operational frequency of compressor Hz Capacity correction factors Correction of Cooling input 0 0 1 0 2 0 3 0 0 50 100 The operational frequency of compressor Hz Input correction factors Correction of Heating capacity 0 0 0 5 1 0 ...

Page 24: ...oor low pressure MUZ GE25VA MUZ GE25VAH MUZ GE35VA MUZ GE35VAH MUZ GE42VA MUZ GE42VAH 15 20 25 30 35 50 60 70 Ambient temperature C Ambient humidity 15 20 25 30 35 50 60 70 Ambient temperature C Ambient humidity 0 5 0 6 0 7 0 8 0 9 0 4 0 5 0 6 0 7 0 3 0 4 0 5 0 6 0 7 15 20 25 30 35 50 60 70 Ambient temperature C Ambient humidity kgf cm2 Gauge MPa Gauge 6 5 7 8 9 kgf cm2 Gauge MPa Gauge 4 5 6 7 kgf...

Page 25: ...e MPa Gauge 15 20 50 25 60 30 70 35 4 0 5 0 6 0 7 0 8 0 9 0 15 20 50 25 60 30 70 35 4 0 5 0 6 0 7 0 8 0 9 0 MUZ GE60VA MUZ GE71VA 4 0 4 5 5 0 5 5 Ambient temperature C Ambient humidity 15 20 50 25 60 30 70 35 4 5 5 0 5 5 6 0 6 5 15 20 25 30 35 2 2 2 2 4 2 6 15 20 25 30 35 50 60 70 Ambient temperature C Ambient humidity 50 60 70 Ambient temperature C Ambient humidity Outdoor current A Outdoor curre...

Page 26: ...5 20 25 Ambient temperature C Outdoor current A 6 0 5 5 5 0 4 5 4 0 5 10 15 20 25 MUZ GE35VA MUZ GE35VAH MUZ GE25VA MUZ GE25VAH Outdoor unit current Ambient temperature C Ambient temperature C Outdoor current A Outdoor current A Outdoor current A Ambient temperature C MUZ GE42VA MUZ GE42VAH MUZ GE50VA MUZ GE50VAH Condition Operation Test run operation Refer to 8 3 HEAT operation Indoor Outdoor Dry...

Page 27: ... 2 24 0 78 540 27 24 3 35 2 21 0 66 496 3 23 2 13 0 66 523 3 15 2 08 0 66 540 3 05 2 01 0 66 567 27 26 3 45 1 86 0 54 523 3 35 1 81 0 54 550 3 30 1 78 0 54 567 3 20 1 73 0 54 583 28 18 2 94 2 94 1 00 436 2 81 2 81 1 00 458 2 70 2 70 1 00 480 2 60 2 60 1 00 501 28 20 3 06 2 88 0 94 458 2 94 2 76 0 94 485 2 85 2 68 0 94 496 2 75 2 59 0 94 518 28 22 3 19 2 61 0 82 474 3 08 2 52 0 82 504 3 00 2 46 0 8...

Page 28: ... 1 99 0 78 610 2 38 1 85 0 78 632 27 24 2 88 1 90 0 66 600 2 70 1 78 0 66 627 2 55 1 68 0 66 654 27 26 3 03 1 63 0 54 621 2 85 1 54 0 54 649 2 68 1 44 0 54 676 28 18 2 45 2 45 1 00 534 2 25 2 25 1 00 567 2 08 2 08 1 00 589 28 20 2 58 2 42 0 94 556 2 40 2 26 0 94 583 2 23 2 09 0 94 616 28 22 2 73 2 23 0 82 578 2 55 2 09 0 82 610 2 38 1 95 0 82 632 28 24 2 88 2 01 0 70 600 2 70 1 89 0 70 627 2 55 1 ...

Page 29: ... 2 58 0 64 856 27 24 4 69 2 44 0 52 787 4 52 2 35 0 52 830 4 41 2 29 0 52 856 4 27 2 22 0 52 900 27 26 4 83 1 93 0 40 830 4 69 1 88 0 40 874 4 62 1 85 0 40 900 4 48 1 79 0 40 926 28 18 4 11 3 78 0 92 692 3 94 3 62 0 92 727 3 78 3 48 0 92 761 3 64 3 35 0 92 796 28 20 4 29 3 43 0 80 727 4 11 3 29 0 80 770 3 99 3 19 0 80 787 3 85 3 08 0 80 822 28 22 4 46 3 03 0 68 753 4 31 2 93 0 68 800 4 20 2 86 0 6...

Page 30: ...64 969 3 33 2 13 0 64 1003 27 24 4 03 2 09 0 52 952 3 78 1 97 0 52 995 3 57 1 86 0 52 1038 27 26 4 24 1 69 0 40 986 3 99 1 60 0 40 1029 3 75 1 50 0 40 1073 28 18 3 43 3 16 0 92 848 3 15 2 90 0 92 900 2 91 2 67 0 92 934 28 20 3 61 2 88 0 80 882 3 36 2 69 0 80 926 3 12 2 49 0 80 977 28 22 3 82 2 59 0 68 917 3 57 2 43 0 68 969 3 33 2 26 0 68 1003 28 24 4 03 2 25 0 56 952 3 78 2 12 0 56 995 3 57 2 00 ...

Page 31: ...59 1203 27 24 5 63 2 65 0 47 1106 5 42 2 55 0 47 1166 5 29 2 49 0 47 1203 5 12 2 41 0 47 1264 27 26 5 80 2 03 0 35 1166 5 63 1 97 0 35 1227 5 54 1 94 0 35 1264 5 38 1 88 0 35 1300 28 18 4 94 4 29 0 87 972 4 73 4 11 0 87 1021 4 54 3 95 0 87 1069 4 37 3 80 0 87 1118 28 20 5 15 3 86 0 75 1021 4 94 3 70 0 75 1081 4 79 3 59 0 75 1106 4 62 3 47 0 75 1154 28 22 5 36 3 37 0 63 1057 5 17 3 25 0 63 1124 5 0...

Page 32: ...0 59 1361 3 99 2 35 0 59 1409 27 24 4 83 2 27 0 47 1337 4 54 2 13 0 47 1397 4 28 2 01 0 47 1458 27 26 5 08 1 78 0 35 1385 4 79 1 68 0 35 1446 4 49 1 57 0 35 1507 28 18 4 12 3 58 0 87 1191 3 78 3 29 0 87 1264 3 49 3 03 0 87 1312 28 20 4 33 3 24 0 75 1239 4 03 3 02 0 75 1300 3 74 2 80 0 75 1373 28 22 4 58 2 88 0 63 1288 4 28 2 70 0 63 1361 3 99 2 51 0 63 1409 28 24 4 83 2 46 0 51 1337 4 54 2 31 0 51...

Page 33: ... 58 1500 27 24 6 70 3 08 0 46 1379 6 45 2 97 0 46 1454 6 30 2 90 0 46 1500 6 10 2 81 0 46 1576 27 26 6 90 2 35 0 34 1454 6 70 2 28 0 34 1530 6 60 2 24 0 34 1576 6 40 2 18 0 34 1621 28 18 5 88 5 05 0 86 1212 5 63 4 84 0 86 1273 5 40 4 64 0 86 1333 5 20 4 47 0 86 1394 28 20 6 13 4 53 0 74 1273 5 88 4 35 0 74 1348 5 70 4 22 0 74 1379 5 50 4 07 0 74 1439 28 22 6 38 3 95 0 62 1318 6 15 3 81 0 62 1401 6...

Page 34: ...0 58 1697 4 75 2 76 0 58 1757 27 24 5 75 2 65 0 46 1667 5 40 2 48 0 46 1742 5 10 2 35 0 46 1818 27 26 6 05 2 06 0 34 1727 5 70 1 94 0 34 1803 5 35 1 82 0 34 1879 28 18 4 90 4 21 0 86 1485 4 50 3 87 0 86 1576 4 15 3 57 0 86 1636 28 20 5 15 3 81 0 74 1545 4 80 3 55 0 74 1621 4 45 3 29 0 74 1712 28 22 5 45 3 38 0 62 1606 5 10 3 16 0 62 1697 4 75 2 95 0 62 1757 28 24 5 75 2 88 0 50 1667 5 40 2 70 0 50...

Page 35: ...42 27 24 8 04 3 94 0 49 1602 7 74 3 79 0 49 1690 7 56 3 70 0 49 1742 7 32 3 59 0 49 1830 27 26 8 28 3 06 0 37 1690 8 04 2 97 0 37 1778 7 92 2 93 0 37 1830 7 68 2 84 0 37 1883 28 18 7 05 6 27 0 89 1408 6 75 6 01 0 89 1478 6 48 5 77 0 89 1549 6 24 5 55 0 89 1619 28 20 7 35 5 66 0 77 1478 7 05 5 43 0 77 1566 6 84 5 27 0 77 1602 6 60 5 08 0 77 1672 28 22 7 65 4 97 0 65 1531 7 38 4 80 0 65 1628 7 20 4 ...

Page 36: ...971 5 70 3 48 0 61 2042 27 24 6 90 3 38 0 49 1936 6 48 3 18 0 49 2024 6 12 3 00 0 49 2112 27 26 7 26 2 69 0 37 2006 6 84 2 53 0 37 2094 6 42 2 38 0 37 2182 28 18 5 88 5 23 0 89 1725 5 40 4 81 0 89 1830 4 98 4 43 0 89 1901 28 20 6 18 4 76 0 77 1795 5 76 4 44 0 77 1883 5 34 4 11 0 77 1989 28 22 6 54 4 25 0 65 1866 6 12 3 98 0 65 1971 5 70 3 71 0 65 2042 28 24 6 90 3 66 0 53 1936 6 48 3 43 0 53 2024 ...

Page 37: ...09 27 24 9 51 4 57 0 48 1938 9 16 4 40 0 48 2045 8 95 4 29 0 48 2109 8 66 4 16 0 48 2215 27 26 9 80 3 53 0 36 2045 9 51 3 43 0 36 2151 9 37 3 37 0 36 2215 9 09 3 27 0 36 2279 28 18 8 34 7 34 0 88 1704 7 99 7 03 0 88 1789 7 67 6 75 0 88 1874 7 38 6 50 0 88 1960 28 20 8 70 6 61 0 76 1789 8 34 6 34 0 76 1896 8 09 6 15 0 76 1938 7 81 5 94 0 76 2024 28 22 9 05 5 79 0 64 1853 8 73 5 59 0 64 1970 8 52 5 ...

Page 38: ...386 6 75 4 05 0 60 2471 27 24 8 17 3 92 0 48 2343 7 67 3 68 0 48 2450 7 24 3 48 0 48 2556 27 26 8 59 3 09 0 36 2428 8 09 2 91 0 36 2535 7 60 2 73 0 36 2641 28 18 6 96 6 12 0 88 2087 6 39 5 62 0 88 2215 5 89 5 19 0 88 2300 28 20 7 31 5 56 0 76 2173 6 82 5 18 0 76 2279 6 32 4 80 0 76 2407 28 22 7 74 4 95 0 64 2258 7 24 4 63 0 64 2386 6 75 4 32 0 64 2471 28 24 8 17 4 25 0 52 2343 7 67 3 99 0 52 2450 ...

Page 39: ... 92 1095 3 62 1285 4 27 1416 4 97 1518 5 67 1591 6 32 1635 7 02 1679 MUZ GE50VAH MUZ GE50VAH CAPACITY 5 8 kW INPUT 1565 W INDOOR DB C OUTDOOR WB C 10 5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 3 65 1017 4 41 1221 5 16 1377 5 92 1487 6 67 1581 7 37 1628 8 12 1659 21 3 48 1096 4 18 1299 4 93 1440 5 63 1549 6 38 1628 7 08 1675 7 80 1737 26 3 13 1174 3 89 1377 4 58 1518 ...

Page 40: ...seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running 9 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure prote...

Page 41: ...the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with 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...

Page 42: ...efore blinking does the upper lamp of OPERATION INDICA TOR lamp stay ON for 3 seconds Stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern 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 2 Releasing the failure mod...

Page 43: ...door unit is abnormal Check the blinking pattern and confirm the abnormal point with the out door unit failure mode table 11 2 3 Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair...

Page 44: ...eck refrigerant circuit and refrigerant amount Check stop valve 7 time flash 2 5 seconds OFF Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 70 75 C Check around outdoor unit Check outdoor unit air passage Refer ...

Page 45: ... How to check in verter compressor 12 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 11 5 Check of outdoor fan motor Refer to 11 5 Check of inverter P C board 13 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Refer to 11 5 How...

Page 46: ... between terminals using a tester Temperature 10 40 C Normal Ω MUZ GE25 MUZ GE35 MUZ GE42 50 60 MUZ GE71 U V U W V W 1 36 1 93 1 52 2 17 0 78 1 11 0 83 1 18 Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 10 40 C Color of lead wire Normal Ω MUZ GE25 35 MUZ GE42 MUZ GE50 60 71 RED BLK BLK WHT WHT RED 29 42 11 16 12 17 R V coil 21S4 Measure the resistance using...

Page 47: ... Check of open phase C Check of compressor 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 Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERA...

Page 48: ...ut 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 8 3 Measurement Measure the time from the start of compressor to the stop ...

Page 49: ...72 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6 MUZ GE25VA MUZ GE35VA MUZ GE42VA MUZ GE50VA MUZ GE60VA MUZ GE71VA First of all measure the resistance of R V coil to check if the coil is defective Refer to 11 4 In case CN721 MUZ GE25 35 42 50 CN602 MUZ GE60 71 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector alt...

Page 50: ...fer to 11 4 Disconnect CN932 from the inverter P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to ei...

Page 51: ...itch Inverter P C board Solder side DB61 280 370 VDC MUZ GE25VA MUZ GE25VAH MUZ GE35VA MUZ GE35VAH MUZ GE42VA MUZ GE42VAH MUZ GE50VA MUZ GE50VAH MUZ GE60VA MUZ GE71VA Is there voltage 230 VAC between the indoor terminal block S1 and S2 No Yes Replace the indoor electronic control P C board Rectify indoor outdoor connecting wire Yes If light up OK If flash refer to 11 3 Does the upper lamp of OPERA...

Page 52: ... LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 11 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate on touching it Turn ON the power supply Preparation of the remote controller While...

Page 53: ... fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED flash 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 11 3 Yes No Yes 10 time flash No L Check of inverter P C board MUZ GE50 60 71 ...

Page 54: ... C board is normal LED blinks 6 times after 3 minutes Is the bus bar voltage of the inverter P C board or the outdoor electronic control P C board normal Refer to TEST POINT DIAGRAM AND VOLTAGE of the outdoor unit Yes No Check of power supply Refer to 11 5 Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION switch A Is serial s...

Page 55: ... wire Yes Correct them No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 and S3 1 B 1 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6...

Page 56: ...or the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor ...

Page 57: ...nt temperature thermistor and circuit of defrost heater securely connected to connectors Is there 230 VAC between CN722 and on the inverter P C board Refer to 11 6 1 Not the problem of the inverter P C board Replace the inverter P C board No Yes In HEAT mode for more than 5 minutes let the ambient temperature thermistor continue to read 5 C or below and let the defrost thermistor continue to read ...

Page 58: ...E42VA MUZ GE42VAH 11 6 TEST POINT DIAGRAM AND VOLTAGE Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 DB61 280 370 VDC Front side of unit 230 VAC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacitor C61 Smoothing capacitor...

Page 59: ...e thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 DB61 280 370 VDC Front side of unit 230 VAC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacitor C61 Smoothing capacitor C63 Fuse F801 T3 15AL250V Fuse F901 T3 15AL250V R V coil CN721 230 ...

Page 60: ...Fin temperature thermistor RT64 Resistance k Resistance k Resistance k Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V LEV connector CN724 Jumper wire fo...

Page 61: ...is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Back panel Service panel Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the service panel Direction to remove Screws of the cabinet Ho...

Page 62: ...t and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil Photo 5 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors Inverter P...

Page 63: ...ve 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 of pipes connect...

Page 64: ...anel 5 Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 1 Photo 2 Screws of the cabinet Screws of the back panel Screw of the top panel Screw of the top panel Screws of the back panel Screws of the cabinet Screw...

Page 65: ...rter assembly Photo 4 6 Remove the screw of the earth wire and screw of the T B support Photo 4 7 Remove the screw of the PB fixture 8 Remove the relay panel from the PB support 9 Remove the inverter P C board from the inverter assembly Photo 3 Photo 4 Inverter assembly Photo5 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN...

Page 66: ...oving outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove ...

Page 67: ...e the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 1 Photo 2 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of the cabinet Screws of the cabinet Screws of the servi...

Page 68: ...emove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Remove the earth wires and the lead wires of the inverter P C board 7 Remove the screw of the PB support 8 Remove the inverter P C board from the relay panel Photo 3 Photo 4 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector Inverter P C board CN602 ...

Page 69: ...fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter a...

Page 70: ...RIC CO LTD Distributed in Jun 2010 No OBH516 REVISED EDITION C 5 Distributed in Oct 2009 No OBH516 REVISED EDITION B 5 Distributed in Dec 2008 No OBH516 REVISED EDITION A 5 Distributed in Aug 2008 No OBH516 6 Made in Japan New publication effective Jun 2010 Specifications subject to change without notice ...

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Mitsubishi Electric MUZ-GE25VA, Service Manual

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Summary of Contents for MUZ-GE25VA

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