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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-AP25VG
MUZ-AP35VG
MUZ-AP42VG
MUZ-AP50VG
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E1
ET1
E2
ET2
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E1
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ET1
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E2
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ET2
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E1
ET1
E2
ET2
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E1
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ET1
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ER1
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E2
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E1
ET1
ER1
E2
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E1
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ET1
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ER1
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E2
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E1
ET1
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E1
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E2
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E3
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E1
E2
E3
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E1
E2
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E1
E2
MUZ-AP25VGH
MUZ-AP35VGH
MUZ-AP42VGH
Revision H:
• MUZ-AP60VG-
AP71VG2-
OBH789 REVISED EDITION-G is void.
HFC
utilized
R32
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,
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ER2
E3
ET3
ER3
ER2
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E3
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ET3
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ER3
ER2
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ET2
E3
Indoor unit service manual
MSZ-AP•VG, VGK Series (OBH788)
CONTENTS
1. TECHNICAL CHANGES ······························3
USING REFRIGERANT R32 ·························4
3. PART NAMES AND FUNCTIONS ··················6
4. SPECIFICATION ········································7
5. NOISE CRITERIA CURVES ························ 11
6. OUTLINES AND DIMENSIONS ··················· 13
7. WIRING DIAGRAM ··································· 17
8. REFRIGERANT SYSTEM DIAGRAM ··········· 27
9. PERFORMANCE CURVES ························ 31
10. ACTUATOR CONTROL ····························· 52
11. SERVICE FUNCTIONS ······························ 53
12. TROUBLESHOOTING ······························· 54
13. DISASSEMBLY INSTRUCTIONS ················· 77
PARTS CATALOG (OBB789)
,
MUZ-
ET2
E3
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have been added.
E1
ET1
No. OBH789
REVISED EDITION-H
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-AP60VG-ET2
Summary of Contents for Mitsubishi Electric MUZ-AP60VG-ET2
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Page 1: Table Of Contents
Revision H: • MUZ-AP60VG- MUZ- AP71VG2- have been added. OBH789 REVISED EDITION-G is void. OUTDOOR UNIT No. OBH789 utilized REVISED EDITION-H SERVICE MANUAL Models MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH Indoor unit service manual MUZ-AP50VGH MSZ-AP•VG, VGK Series (OBH788) MUZ-AP25VG MUZ-AP25VGH CONTENTS... - Page 2 Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
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Page 3: Muz-Ap60Vg
TECHNICAL CHANGES MUZ-AP25VG - MUZ-AP35VG - MUZ-AP42VG - MUZ-AP50VG - MUZ-AP25VGH - MUZ-AP35VGH - MUZ-AP42VGH - MUZ-AP50VGH - MUZ-AP60VG - MUZ-AP71VG - 1. New model MUZ-AP25VG - MUZ-AP25VG - MUZ-AP35VG - MUZ-AP35VG - MUZ-AP42VG - MUZ-AP42VG - MUZ-AP50VG - MUZ-AP50VG - MUZ-AP60VG - MUZ-AP60VG - MUZ-AP71VG -... -
Page 4: Servicing Precautions For Units Using Refrigerant R32
SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 Servicing precautions for units using refrigerant R32 WARNING This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. - Page 5 5. Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. 6. Leak Detection Methods Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need recalibration.
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Page 6: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-AP25VG MUZ-AP50VG MUZ-AP35VG MUZ-AP60VG MUZ-AP42VG MUZ-AP50VGH MUZ-AP25VGH MUZ-AP35VGH Air inlet (Back and side) MUZ-AP42VGH Air inlet (Back and side) Piping Piping Air outlet Air outlet Drain hose Drain hose Drain outlet Drain outlet MUZ-AP71VG2 MUZ-AP71VG Air inlet (Back and side) Air inlet (back and side) -
Page 7: Specification
SPECIFICATION MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG Outdoor model MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.9 - 3.4) 3.5 (1.1 - 3.8) 4.2 (0.9 - 4.5) 5.0 (1.4 - 5.4) Capacity Rated (Min.-Max.) Heating 3.2 (1.0 - 4.1) 4.0 (1.3 - 4.6) 5.4 (1.3 - 6.0) - Page 8 Outdoor model MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 Power supply Single phase, 230 V, 50 Hz Cooling 6.1 (1.4 - 7.3) 7.1 (2.0 - 8.7) 7.1 (2.0 - 8.7) Capacity Rated (Min.-Max.) Heating 6.8 (2.0 - 8.6) 8.0 (2.2 - 10.3) 8.0 (2.2 - 10.3) Breaker Capacity Cooling 1,590...
- Page 9 Specifications and rated conditions of main electric parts MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Model Item AP25VG AP25VGH AP35VG AP35VGH AP42VG AP42VGH AP50VG AP50VGH (C61) — 600 µF/ 620 µF 420 V Smoothing capacitor (C62, C63) 600 µF/ 620 µF 420 V (DB61) 15 A 600 V 25 A 600 V...
- Page 10 Model MUZ-AP71VG2 Item Smoothing (CB1, CB2, CB3) 560 µF 450 V capacitor (F61) 25 A 250V Fuse (F62) 15 A 250V (F601, F880, F901) T3.15AL250V Switching power (Q3A, Q3B) 30 A 650 V transistor (IC932) 5 A 600 V Power module (IC700) 20 A 600 V Expansion valve...
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Page 11: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-AP35VG MUZ-AP25VG FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE MUZ-AP35VGH MUZ-AP25VGH COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MUZ-AP42VG MUZ-AP50VG... - Page 12 MUZ-AP60VG MUZ-AP71VG FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE MUZ-AP71VG2 COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz Test conditions Cooling: Dry-bulb temperature 35°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C...
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Page 13: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG Unit: mm MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH (MUZ-AP25/35/42VG) (MUZ-AP25/35/42VGH) OBH789H... - Page 14 MUZ-AP50VG MUZ-AP60VG Unit: mm MUZ-AP50VGH MUZ-AP50VG, MUZ-AP50VGH MUZ-AP60VG OBH789H...
- Page 15 MUZ-AP71VG Unit: mm REQUIRED SPACE *1: 500 mm or more when front and sides of the unit are clear 417.5 Air in Air in Air out 2-holes 10 21 *2: When any 2 sides of left, right and rear of the unit are clear Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared)
- Page 16 MUZ-AP71VG2 Unit: mm REQUIRED SPACE FLARED ø6.35 (1/4”) FLARED ø12.7 (1/2”) OBH789H...
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Page 17: Wiring Diagram
WIRING DIAGRAM MUZ-AP25VG - MUZ-AP35VG - MUZ-AP25VG - MUZ-AP35VG - OBH789H... - Page 18 MUZ-AP25VGH - MUZ-AP35VGH - OBH789H...
- Page 19 MUZ-AP42VG - MUZ-AP42VG - OBH789H...
- Page 20 MUZ-AP42VGH - OBH789H...
- Page 21 MUZ-AP50VG - MUZ-AP50VG - OBH789H...
- Page 22 MUZ-AP50VGH - MUZ-AP60VG - OBH789H...
- Page 23 MUZ-AP60VG - MUZ-AP60VG - OBH789H...
- Page 24 MUZ-AP60VG - MUZ-AP71VG - OBH789H...
- Page 25 MUZ-AP71VG - MUZ-AP71VG - OBH789H...
- Page 26 MUZ-AP71VG2 - MUZ-AP71VG2 - OBH789H...
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Page 27: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-AP25VG MUZ-AP35VG Unit: mm MUZ-AP25VGH MUZ-AP35VGH Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Muffler Outdoor RT68 Discharge Flared connection heat temperature exchanger thermistor RT62 Ambient Compressor temperature thermistor... - Page 28 MUZ-AP50VG MUZ-AP60VG Unit: mm MUZ-AP50VGH Refrigerant pipe ø9.52 (MUZ-AP50VG, MUZ-AP50VGH) ø12.7 (MUZ-AP60VG) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger temperature Stop valve thermistor Outdoor RT68 heat Muffler Discharge exchanger Flared connection temperature thermistor RT62 Ambient temperature Compressor thermistor RT65 Defrost thermistor...
- Page 29 MUZ-AP71VG Unit: mm Refrigerant pipe ø12.7 4-way valve (with heat insulator) Outdoor heat exchanger temperature Stop valve thermistor Outdoor RT68 heat Muffler Discharge exchanger Flared connection temperature thermistor RT62 Ambient temperature Compressor thermistor RT65 Defrost thermistor RT61 Capillary tube ø3.0×ø2.0×200 Strainer #100 Flared connection...
- Page 30 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid MUZ-AP25/35/42/50VG 9.52 6.35 MUZ-AP25/35/42/50VGH MUZ-AP60VG 12.7 6.35 MUZ-AP71VG 12.7 6.35 MUZ-AP71VG2 Indoor unit Max. Height difference Max.
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Page 31: Performance Curves
PERFORMANCE CURVES MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 32 9-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) 10.7 11.7 11.2 Indoor intake air Wet-bulb 10.8 10.3 temperature( ) Outdoor intake air Dry-bulb temperature(°C) Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 16.2...
- Page 33 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-AP25VG MUZ-AP25VGH Correction of Cooling capacity Correction of Cooling input Correction of Heating capacity Correction of Heating input The operational frequency The operational frequency The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz)
- Page 34 MUZ-AP60VG Correction of Heating capacity Correction of Heating input Correction of Cooling capacity Correction of Cooling input The operational frequency The operational frequency The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz) of compressor (Hz) MUZ-AP71VG MUZ-AP71VG2 Correction of Heating input Correction of Cooling capacity...
- Page 35 9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature (°C) Relative humidity (%) Both indoor and outdoor unit are under the same temperature/ humidity condition. Operation: TEST RUN OPERATION (Refer to 9-3.) Outdoor low pressure MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH...
- Page 36 Outdoor unit current MUZ-AP42VG MUZ-AP35VG MUZ-AP25VG MUZ-AP35VGH MUZ-AP42VGH MUZ-AP25VGH Ambient temperature (°C) Ambient temperature (°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP50VGH MUZ-AP71VG2 Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) OBH789H...
- Page 37 HEAT operation Condition: Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 Operation: Test run operation (Refer to 9-3.) Outdoor unit current MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG...
- Page 38 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP25VG MUZ-AP25VGH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.17 0.74 2.81 2.08 0.74 2.70 2.00 0.74 2.60 1.92 0.74 3.06...
- Page 39 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP25VG MUZ-AP25VGH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.81 0.74 2.25 1.67 0.74 2.08 1.54 0.74 2.58 1.60 0.62 2.40 1.49...
- Page 40 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP35VG MUZ-AP35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.88 0.70 3.94 2.76 0.70 3.78 2.65 0.70 3.64 2.55 0.70 4.29...
- Page 41 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP35VG MUZ-AP35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.40 0.70 3.15 2.21 0.70 1030 2.91 2.03 0.70 1069 3.61 2.09 0.58...
- Page 42 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP42VG MUZ-AP42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.91 0.59 1040 4.73 2.79 0.59 1092 4.54 2.68 0.59 1144 4.37...
- Page 43 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP42VG MUZ-AP42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.43 0.59 1274 3.78 2.23 0.59 1352 3.49 2.06 0.59 1404 4.33 2.03...
- Page 44 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP50VG MUZ-AP50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1550 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.29 0.56 1240 5.63 3.15 0.56 1302 5.40 3.02 0.56 1364 5.20...
- Page 45 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP50VG MUZ-AP50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1550 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.74 0.56 1519 4.50 2.52 0.56 1612 4.15 2.32 0.56 1674 5.15 2.27...
- Page 46 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP60VG CAPACITY: 6.1 kW SHF: 0.83 INPUT: 1590 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 7.17 4.66 0.65 1272 6.86 4.46 0.65 1336 6.59 4.28 0.65 1399 6.34 4.12...
- Page 47 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP60VG CAPACITY: 6.1 kW SHF: 0.83 INPUT: 1590 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 5.98 3.89 0.65 1558 5.49 3.57 0.65 1654 5.06 3.29 0.65 1717 6.28 3.33 0.53...
- Page 48 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP71VG MUZ-AP71VG2 CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2010 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 8.34 4.92 0.59 1608 7.99 4.71 0.59 1688 7.67 4.52 0.59 1769 7.38...
- Page 49 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AP71VG MUZ-AP71VG2 CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2010 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 6.96 4.11 0.59 1970 6.39 3.77 0.59 2090 5.89 3.48 0.59 2171 7.31 3.44...
- Page 50 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AP25VG CAPACITY: 3.2 kW INPUT: 780 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.60 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.50 1.92 2.30 2.72 3.10 3.52 3.90...
- Page 51 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AP50VG CAPACITY: 5.8 kW INPUT: 1600 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.90 3.65 1040 4.41 1248 5.16 1408 5.92 1520 6.67 1616 7.37 1664 8.12 1696...
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Page 52: Actuator Control
ACTUATOR CONTROL MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 10-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, 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. -
Page 53: Service Functions
SERVICE FUNCTIONS MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 11-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 12-6-1.) Defrost finish temperature (°C) Jumper wire MUZ-AP25/35/42/50/60VG... -
Page 54: Troubleshooting
TROUBLESHOOTING MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG MUZ-AP71VG2 MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 12-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 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 controller, and after con- firming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. - Page 55 12-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (12-3.) disappears, the memorized failure details can be recalled. 1.
- Page 56 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. *1.
- Page 57 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Upper lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C.
- Page 58 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Upper lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C. board) mode recall recall function function 10-time blink Discharge temperature...
- Page 59 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not 2.5 seconds within 1 minute after the compressor gets started. sor.
- Page 60 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Deceleration of the MUZ-AP25/35/42/50/60 When the input current exceeds approximate- The unit is normal, but check the operates. 2.5 seconds OFF operational frequen- ly 10A, compressor frequency lowers. following.
- Page 61 12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS Part name Check method and criterion Figure Measure the resistance with a multimeter. Defrost thermistor (RT61) Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor. Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65)
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Page 62: Troubleshooting Flow
Part name Check method and criterion Figure Normal (Ω) Defrost heater MUZ-AP25/35/42VGH MUZ-AP50VGH MUZ-AP•VGH 802 - 980 370 - 428 12-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). See 12-5. “Check of open phase”. - Page 63 D Check of compressor winding ● Disconnect the connector between the compressor and the power module (IC700), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT *Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
- Page 64 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 12-6.1.) board.
- Page 65 H Check of R.V. coil MUZ-AP25/35/42/50/60VG, MUZ-AP25/35/42/50VGH * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 12-4. * In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
- Page 66 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 12-4.) Disconnect CN932 from the inverter P.C.
- Page 67 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and Rectify indoor/outdoor press the emergency operation switch. connecting wire. Does the upper lamp of Is there voltage 230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
- Page 68 K Check of LEV (Expansion valve) MSZ-AP25/35/42/50VG MSZ-AP60/71VG MSZ-AP25/35/42/50VGH Turn ON the power supply. <Preparation of the remote controller> While pressing both Operation select button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds.
- Page 69 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 12-5. .) Is the fuse (F901) blown on the inverter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
- Page 70 M How to check miswiring and serial signal error Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored in the indoor unit.
- Page 71 N Check of compressor protector Disconnect the connector of compressor protec- tor in the inverter P.C. board, and check the conduction of compressor protector. Operate the unit Is the discharge temperature Is the compressor and re-confirm if thermistor normal? Refer to 12-5. protector conductive? the abnormality "Check of outdoor thermistors".
- Page 72 P Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
- Page 73 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-AP25VG - MUZ-AP35VG - MUZ-AP42VG - MUZ-AP50VG - MUZ-AP60VG - MUZ-AP25VGH - MUZ-AP35VGH - MUZ-AP42VGH - MUZ-AP50VGH - Smoothing Smoothing Smoothing Fuse (F801) Fuse (F701) capacitor capacitor capacitor T3.15AL250V DB61 Back side of unit T3.15AL250V (C63)
- Page 74 MUZ-AP60VG - R.V.coil/21S4 Smoothing Smoothing Smoothing (CN721) capacitor capacitor (C63) DB61 Back side of unit capacitor 230 V AC (C62) 260 - 370 V DC (C61) 230 V AC Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V Fuse (F62) Fuse (F61) 15 A 250 V 25 A 250 V Output to drive...
- Page 75 MUZ-AP71VG - Jumper wire for pre-heat control Expansion setting (JK) valve coil/ LEV (CN724) Jumper wire for changing defrost setting (JS) Ambient temperature thermistor/RT65 (CN672) Heater (CN601) 230 V AC Outdoor heat exchanger temperature thermistor R.V. coil/21S4 /RT68 (CN671) (CN602) Discharge temperature 230 V AC thermistor/RT62...
- Page 76 MUZ-AP71VG2 - Back side of unit Output to drive Smoothing Smoothing Smoothing R.V. coil/ outdoor fan motor Capacitor Capacitor Capacitor Fuse (F880) 21S4 (CN602) Fuse (F601) (CN932) (CB1) (CB2) (CB3) T3.15AL250V 230 V AC T3.15AL250V 230 V AC Fuse (F62) 15 A 250 V Jumper wire Fuse (F901)
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Page 77: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism > The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 78 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to section 1.) Screws of the heat sink Screws of the terminal block (2) Disconnect the lead wire to the reactor and the following con- support and the separator support and the back panel nectors:...
- Page 79 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) MUZ-AP42VGH (2) Disconnect the following connectors: <Inverter P.C. board> Ambient temperature CN931, CN932 (Fan motor) thermistor (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 80 13-2. MUZ-AP50VG MUZ-AP60VG - MUZ-AP50VGH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 81 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screw of the P.B. support board and the separator (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following con- Screw of the heat sink nectors: support and the separator...
- Page 82 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the R.V. coil (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. Discharge temperature thermistor Outdoor heat Photo 7...
- Page 83 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 9 (1) Remove the cabinet and panels. (Refer to section 1.) Discharge pipe Suction pipe (2) Remove the inverter assembly. (Refer to section 2.) brazed part brazed part (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm...
- Page 84 13-3. MUZ-AP60VG - NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 85 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screw of the P.B. support board and the separator (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following con- Screw of the heat sink nectors: support and the separator...
- Page 86 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 5 board (Photo 5) Lead wires of Lead wires of the heat Lead wires of 1. Connect the lead wires of the heat exchanger temperature the ambient exchanger temperature, the expansion thermistor, the defrost thermistor and discharge tempera- temperature...
- Page 87 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Screw of the CN721 (R.V. coil) R.V. coil (3) Remove the R.V. coil. Discharge temperature thermistor...
- Page 88 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo13 (1) Remove the cabinet and panels. (Refer to section 1.) Compressor protector Discharge pipe Suction pipe (2) Remove the inverter assembly. (Refer to section 2.) brazed part brazed part (3) Recover gas from the refrigerant circuit.
- Page 89 13-4. MUZ-AP71VG NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 90 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screws of the relay panel board Inverter P.C board (1) Remove the cabinet and the service panel. (Refer to section (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 91 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R.V. coil Photo 5 Screw of (1) Remove the cabinet and panels. (Refer to section 1.) the R.V. coil (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (3) Remove the R.V. coil. Brazed parts of 4-way valve 4.
- Page 92 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 7 (1) Remove the top panel, cabinet and service panel. (Refer to Propeller fan section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Propeller fan CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 93 13-5. MUZ-AP71VG2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. Screws of the top panel (3) Remove the screw of the valve cover.
- Page 94 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 board Screw of the heat sink Lead wires of the (1) Remove the cabinet and panels. (Refer to section 1.) support and the separator reactor (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 95 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 Connection procedure when attaching the inverter P.C. board (Photo 6, 7) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C. board to each hooks on the heat sink support as shown Photo 7.
- Page 96 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 8 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat exchanger ture thermistor and ambient temperature thermistor temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 97 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the compressor and 4-way valve Photo 10 (1) Remove the top panel, cabinet and service panel. (Refer to Brazed part of Brazed part of section 1.) the discharge pipe the suction pipe (2) Remove the back panel. (Refer to section 1.) (3) Remove the inverter assembly.
- Page 98 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2023. No. OBH789 REVISED EDITION-H Issued: Jul. 2022. No. OBH789 REVISED EDITION-G Issued: Nov. 2021. No. OBH789 REVISED EDITION-F Issued: Jun. 2021. No. OBH789 REVISED EDITION-E Issued: Jan.
- Page 99 Related Links Model Number: MUZ-AP35VG MSZ-AP25-50VG Declaration of Conformity (CE2017B17) MSZ-AP25-50VG(K) Install Manual (JG79J601H01) MSZ-AP25-50VG(K) Operation Manual (JG79Y415L01) MSZ-AP25-50VGK Declaration of Conformity (CE2017B18) MSZ-AP25-50VGK DoC (CE2020D01) MSZ-AP25-50VGK DoC (CE2021B03) MUZ-AP25-71VG Parts List (OBB789-A) MUZ-AP25-71VG Service Manual (OBH789-A) MUZ-AP60-71VG Parts List MUZ-AP60-71VG2 Service Manual MSZ-AP25-50VGK Declaration of Conformity (CE2018D02)
- Page 100 Related Links Model Number: MUZ-AP35VG...
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