Mitsubishi Electric MUZ-AP25VG Service Manual
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Mitsubishi Electric MUZ-AP25VG Service Manual

Mitsubishi Electric MUZ-AP25VG Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-AP25VG
MUZ-AP35VG
MUZ-AP42VG
MUZ-AP50VG
MUZ-AP60VG
MUZ-AP71VG
MUZ-AP25VG
MUZ-AP35VG
MUZ-AP42VG
-
E1
ET1
E2
ET2
,
,
,
-
E1
ET1
E2
ET2
,
,
,
-
E1
,
ET1
,
E2
,
ET2
-
E1
,
ET1
-
E1
ET1
,
-
E1
,
ET1
MUZ-AP25VGH
MUZ-AP35VGH
MUZ-AP42VGH
Revision A:
• MUZ-AP25/35/42VG-
MUZ-AP25/35/42VGH-
AP60/71VG-
added.
OBH789 is void.
HFC
utilized
R32
MUZ-AP25VGH
ER2
,
MUZ-AP35VGH
ER2
,
MUZ-AP42VGH
,
ER2
MUZ-AP50VGH
Indoor unit service manual
MSZ-AP•VG(K) Series (OBH788)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
USING REFRIGERANT R32 ····························· 3
3. PART NAMES AND FUNCTIONS ····················· 5
4. SPECIFICATION ················································ 6
5. NOISE CRITERIA CURVES ······························ 9
6. OUTLINES AND DIMENSIONS ·······················11
7. WIRING DIAGRAM ·········································· 14
8. REFRIGERANT SYSTEM DIAGRAM ············· 18
9. PERFORMANCE CURVES ····························· 21
10. ACTUATOR CONTROL ··································· 40
11. SERVICE FUNCTIONS ···································· 41
12. TROUBLESHOOTING ····································· 42
13. DISASSEMBLY INSTRUCTIONS ···················· 63
PARTS CATALOG (OBB789)
,
,
,
E2
ET2
ER2
and MUZ-
E2
,
have been
E1
ET1
No. OBH789
REVISED EDITION-A
-
E1
E2
,
-
E1
E2
,
-
E1
,
E2
-
E1

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Summary of Contents for Mitsubishi Electric MUZ-AP25VG

  • Page 1: Table Of Contents

    • MUZ-AP25/35/42VG- MUZ-AP25/35/42VGH- and MUZ- AP60/71VG- have been added. OBH789 is void. OUTDOOR UNIT No. OBH789 REVISED EDITION-A utilized SERVICE MANUAL Models MUZ-AP25VG MUZ-AP25VGH MUZ-AP35VG MUZ-AP35VGH MUZ-AP42VG MUZ-AP42VGH MUZ-AP50VGH MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG Indoor unit service manual MSZ-AP•VG(K) Series (OBH788) MUZ-AP25VG...

  • Page 2: Technical Changes

    When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. Revision A: • MUZ-AP25/35/42VG- , MUZ-AP25/35/42VGH- and MUZ-AP60/71VG- have been added. TECHNICAL CHANGES MUZ-AP25VG - MUZ-AP35VG - MUZ-AP42VG - MUZ-AP50VG - MUZ-AP25VGH - MUZ-AP35VGH - MUZ-AP42VGH - MUZ-AP50VGH -...

  • Page 3: 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 4 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 re-calibration.

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-AP25VG MUZ-AP50VG MUZ-AP35VG MUZ-AP60VG MUZ-AP42VG MUZ-AP50VGH MUZ-AP25VGH Air inlet MUZ-AP35VGH (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-AP71VG Air inlet...

  • Page 6: 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)
  • Page 7 Outdoor model MUZ-AP60VG MUZ-AP71VG Power supply Single phase, 230 V, 50 Hz Cooling 6.1 (1.4 - 7.3) 7.1 (2.0 - 8.7) Capacity Rated (Min.-Max.) Heating 6.8 (2.0 - 8.6) 8.0 (2.2 - 10.3) Breaker Capacity Cooling 1,590 2,010 Power input 1 (Set) Heating 1,670 2,120...
  • Page 8 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 Diode module (DB61) 15 A 600 V...

  • Page 9: 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...
  • Page 10 MUZ-AP60VG MUZ-AP71VG FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE 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 Wet-bulb temperature 24°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C...

  • Page 11: 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) OBH789A...
  • Page 12 MUZ-AP50VG MUZ-AP60VG Unit: mm MUZ-AP50VGH MUZ-AP50VG(H) MUZ-AP60VG OBH789A...
  • Page 13 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 14: Wiring Diagram

    WIRING DIAGRAM MUZ-AP25VG - MUZ-AP35VG - MUZ-AP25VGH - MUZ-AP35VGH - OBH789A...
  • Page 15 MUZ-AP42VG - MUZ-AP42VGH - OBH789A...
  • Page 16 MUZ-AP50VG - MUZ-AP50VGH - OBH789A...
  • Page 17 MUZ-AP60VG - MUZ-AP71VG - OBH789A...

  • Page 18: 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...
  • Page 19 MUZ-AP50VG MUZ-AP60VG Unit: mm MUZ-AP50VGH Refrigerant pipe ø9.52 [MUZ-AP50VG(H)] 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 RT61...
  • Page 20 10 m 11 m 12 m 13 m 14 m 15 m 20 m MUZ-AP25VG(H) MUZ-AP35VG(H) MUZ-AP42VG(H) MUZ-AP50VG(H) 1,000 Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7) Refrigerant piping length (one way) Outdoor unit...

  • Page 21: Performance Curves

    PERFORMANCE CURVES MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG 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 22 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 20.3 25.2 27.1 21.9 27.6 15.0 20.2 25.5 18.7 23.3 25.0 13.7 21.3 18.5 23.3 17.2 22.9 12.5...
  • Page 23 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...
  • Page 24 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 Correction of Heating input Correction of Cooling capacity...
  • Page 25 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 MUZ-AP42VGH (kgf/cm [Gauge])(MPa [Gauge])
  • Page 26 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 Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%)
  • Page 27 Rated frequency PERFORMANCE DATA COOL operation at 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...
  • Page 28 Rated frequency PERFORMANCE DATA COOL operation at 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...
  • Page 29 Rated frequency PERFORMANCE DATA COOL operation at 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 30 Rated frequency PERFORMANCE DATA COOL operation at 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 31 Rated frequency PERFORMANCE DATA COOL operation at 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 32 Rated frequency PERFORMANCE DATA COOL operation at 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 33 Rated frequency PERFORMANCE DATA COOL operation at 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 34 Rated frequency PERFORMANCE DATA COOL operation at 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 35 t Rated frequency PERFORMANCE DATA COOL operation a 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...
  • Page 36 t Rated frequency PERFORMANCE DATA COOL operation a 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...
  • Page 37 Rated frequency PERFORMANCE DATA COOL operation at MUZ-AP71VG 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 4.36...
  • Page 38 Rated frequency PERFORMANCE DATA COOL operation at MUZ-AP71VG 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 0.47...
  • Page 39 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AP25VG MUZ-AP25VGH CAPACITY: 3.2 kW INPUT: 780 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.92 2.30 2.72 3.10 3.52 3.90...

  • Page 40: Actuator Control

    ACTUATOR CONTROL MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG 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 41: Service Functions

    SERVICE FUNCTIONS MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG 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)

  • Page 42: Troubleshooting

    TROUBLESHOOTING MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP60VG MUZ-AP71VG 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 43 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 44 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 45 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 Abnormal point LED indication unit failure Upper lamp Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C.
  • Page 46 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 47 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 1-time blink every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor.
  • Page 48 Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 7-time blink Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 12-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •...
  • Page 49 12-4. TROUBLE CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. thermistor (RT64) board”, for the chart of thermistor. Ambient temperature thermistor (RT65) Outdoor heat exchanger...
  • Page 50 12-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 12-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 12-5.
  • Page 51 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>> Refer to 12-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
  • Page 52 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 53 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 54 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 55 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and press EMERGENCY OPERATION Rectify indoor/outdoor 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 56 K Check of LEV (Expansion valve) MSZ-AP25/35/42/50VG(K) MSZ-AP60/71VG(K) 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 57 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 12-5. .) Is the fuse (F901) blown on the in- verter 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 58 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 59 N Check of the outdoor refrigerant circuit The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again.
  • Page 60 O 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 61 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) (C62) (C61) R.V.coil/21S4...
  • Page 62 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 (CN671)

  • Page 63: Disassembly Instructions

    Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. 13-1. MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH NOTE: Turn OFF the power supply before disassembly. Photos: MUZ-AP42VGH OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet...
  • Page 64 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 65 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) (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 66 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 67 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 68 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 exchanger tempera-...
  • Page 69 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 70 13-3. 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 71 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 72 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 73 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 74 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2019. No. OBH789 REVISED EDITION-A Published: Dec. 2017. No. OBH789 Made in Japan Specifications are subject to change without notice.
  • Page 75 Related Links Model Number: MUZ-AP42VG MSZ-AP R32 Product Information Sheet MSZ-AP25-50VG Declaration of Conformity (CE2017B17) MSZ-AP25-50VG(K) Install Manual (JG79J601H01) 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)

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