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Mitsubishi Electric MUZ-EF25VG Service Manual
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Mitsubishi Electric MUZ-EF25VG Service Manual

Outdoor unit
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-EF25VG
MUZ-EF35VG
MUZ-EF42VG
MUZ-EF50VG
MUZ-EF25VG
MUZ-EF35VG
MUZ-EF42VG
MUZ-EF25VGH
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,
E1
ET1
MUZ-EF35VGH
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E1
,
ET1
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,
E1
ET1
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,
E1
ET1
CONTENTS
10. ACTUATOR CONTROL ··································· 28
11. SERVICE FUNCTIONS ···································· 29
12. TROUBLESHOOTING ····································· 30
13. DISASSEMBLY INSTRUCTIONS ···················· 50
PARTS CATALOG (OBB832)
HFC
utilized
R32
Indoor unit service manual
MSZ-EF•VG Series (OBH831)
1. TECHNICAL CHANGES ··································· 2
USING REFRIGERANT R32 ····························· 3
3. PART NAMES AND FUNCTIONS ····················· 5
4. SPECIFICATION ················································ 6
5. NOISE CRITERIA CURVES ······························ 8
6. OUTLINES AND DIMENSIONS ························ 9
7. WIRING DIAGRAM ·········································· 10
8. REFRIGERANT SYSTEM DIAGRAM ············· 12
9. PERFORMANCE CURVES ····························· 14
No. OBH832
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E1
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E1

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  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OBH832 utilized SERVICE MANUAL Models MUZ-EF25VG MUZ-EF25VGH MUZ-EF35VG MUZ-EF35VGH MUZ-EF42VG MUZ-EF50VG Indoor unit service manual MSZ-EF•VG Series (OBH831) MUZ-EF25VG CONTENTS MUZ-EF35VG 1. TECHNICAL CHANGES ··································· 2 MUZ-EF42VG 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ····························· 3 3.

  • Page 2: Technical Changes

    Do not touch the hot or cold areas in the refrigeration cycle. 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. TECHNICAL CHANGES MUZ-EF25VG - MUZ-EF35VG - MUZ-EF42VG - MUZ-EF50VG -...

  • Page 3: Servicing Precautions For Units

    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-EF25VG MUZ-EF50VG MUZ-EF35VG MUZ-EF42VG MUZ-EF25VGH MUZ-EF35VGH Air inlet Air inlet (back and side) (back and side) Piping Piping Air outlet Air outlet Drain hose Drain hose Drain outlet Drain outlet ACCESSORIES MUZ-EF25VG MUZ-EF35VG MODELS MUZ-EF42VG MUZ-EF50VG...

  • Page 6: Specification

    SPECIFICATION 1 Measured under rated operating frequency. MUZ-EF25VG MUZ-EF35VG Outdoor model MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.9 - 3.4) 3.5 (1.1 - 4.0) 4.2 (0.9 - 4.6) 5.0 (1.4 - 5.4) Capacity Rated frequency (Min.-Max.)
  • Page 7 Specifi cations and rated conditions of main electric parts MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Model Item EF25VG EF25VGH EF35VG EF35VGH EF42VG EF50VG (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 8: Noise Criteria Curves

    NOISE CRITERIA CURVES MUZ-EF25VG MUZ-EF35VG MUZ-EF25VGH MUZ-EF35VGH 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...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG Unit: mm MUZ-EF25VGH MUZ-EF35VGH (MUZ-EF25/35/42VG) (MUZ-EF25/35VGH) MUZ-EF50VG (MUZ-EF50VG) OBH832...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MUZ-EF25VG - MUZ-EF35VG - MUZ-EF25VGH - MUZ-EF35VGH - OBH832...
  • Page 11 MUZ-EF42VG - MUZ-EF50VG - OBH832...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-EF25VG MUZ-EF35VG Unit: mm MUZ-EF25VGH MUZ-EF35VGH Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 Flared connection heat temperature exchanger thermistor RT62 Ambient...
  • Page 13 12 m 13 m 14 m 15 m 20 m 30 m MUZ-EF25VG(H) MUZ-EF35VG(H) MUZ-EF42VG MUZ-EF50VG 1,050 Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7) NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.

  • Page 14: Performance Curves

    PERFORMANCE CURVES MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH 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 15 Total input (Cooling : at Rated frequency 11.2 10.2 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 17.6 20.6 26.8 26.0 16.2 19.0 24.7 24.0 14.9 17.4 22.6 22.0 13.5 15.8 20.6 20.0 12.2...
  • Page 16 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-EF25VG MUZ-EF25VGH Correction of Cooling input Correction of Heating capacity Correction of Heating input Correction of Cooling capacity The operational frequency The operational frequency The operational frequency The operational frequency...
  • Page 17 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-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF25VGH MUZ-EF35VGH (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm...
  • Page 18 Outdoor unit current MUZ-EF42VG MUZ-EF35VG MUZ-EF25VG MUZ-EF35VGH MUZ-EF25VGH Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-EF50VG Ambient temperature (°C) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5...
  • Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF25VG MUZ-EF25VGH CAPACITY: 2.5 kW SHF: 0.97 INPUT: 540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.32 0.79 2.81 2.22 0.79 2.70 2.13 0.79 2.60...
  • Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF25VG MUZ-EF25VGH CAPACITY: 2.5 kW SHF: 0.97 INPUT: 540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.94 0.79 2.25 1.78 0.79 2.08 1.64 0.79 2.58 1.73...
  • Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF35VG MUZ-EF35VGH CAPACITY: 3.5 kW SHF: 0.8 INPUT: 910 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.55 0.62 3.94 2.44 0.62 3.78 2.34 0.62 3.64 2.26 0.62...
  • Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF35VG MUZ-EF35VGH CAPACITY: 3.5 kW SHF: 0.8 INPUT: 910 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.13 0.62 3.15 1.95 0.62 2.91 1.80 0.62 3.61 1.80 0.50 3.36...
  • Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF42VG CAPACITY: 4.2 kW SHF: 0.74 INPUT: 1200 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.76 0.56 4.73 2.65 0.56 1008 4.54 2.54 0.56 1056 4.37 2.45...
  • Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF42VG CAPACITY: 4.2 kW SHF: 0.74 INPUT: 1200 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.30 0.56 1176 3.78 2.12 0.56 1248 3.49 1.95 0.56 1296 4.33 1.90...
  • Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF50VG CAPACITY: 5.0 kW SHF: 0.7 INPUT: 1540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.06 0.52 1232 5.63 2.93 0.52 1294 5.40 2.81 0.52 1355 5.20...
  • Page 26 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF50VG CAPACITY: 5.0 kW SHF: 0.7 INPUT: 1540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.55 0.52 1509 4.50 2.34 0.52 1602 4.15 2.16 0.52 1663 5.15 2.06...
  • Page 27 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-EF25VG MUZ-EF25VGH CAPACITY: 3.2 kW INPUT: 700 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 28: Actuator Control

    ACTUATOR CONTROL MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH 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 29: Service Functions

    SERVICE FUNCTIONS MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH 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.) Jumper wire Defrost fi nish temperature (°C)

  • Page 30: Troubleshooting

    TROUBLESHOOTING TROUBLESHOOTING MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH 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 then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 31 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 32 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 33 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 34 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 35 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 36 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 37 12-4. TROUBLE CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 12-6. “TEST POINT DIAGRAM AND VOLTAGE”, 1. “Inverter thermistor (RT65) P.C.
  • Page 38 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 39 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 40 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 41 H Check of R.V. coil 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 42 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 43 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 44 K Check of LEV (Expansion valve) MSZ-EF·VG 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 45 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 46 M How to check miswiring and serial signal error Turn the main 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...
  • Page 47 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 48 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 49 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG MUZ-EF50VG MUZ-EF25VGH MUZ-EF35VGH Back side of unit R.V.coil/21S4 (CN721) 230 V AC DB61 Smoothing Smoothing Smoothing capacitor (C61) Defrost heater 260 - 370 V DC capacitor capacitor...

  • Page 50: Disassembly Instructions

    Locking lever lever. Connector : Indicates the visible parts in the photos/ 13-1. MUZ-EF25VG MUZ-EF35VG MUZ-EF42VG figures. MUZ-EF25VGH MUZ-EF35VGH : Indicates the invisible parts in the photos/ figures. NOTE: Turn OFF the power supply before disassembly.
  • Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 4 (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 52 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 7 (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 53 13-2. MUZ-EF50VG 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 54 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 55 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 56 (7) Detach the brazed part of pipes connected with 4-way valve. Brazed parts of 4-way valve HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Published: Jan. 2019. No. OBH832 Made in Japan...
  • Page 57 Related Links Model Number: MUZ-EF50VG MSZ-EF R32 Product Information Sheet MSZ-EF-VGK DoC (UK2021B45) MSZ-EF25-50VG MUZ-EF25-50VG Declaration of Conformity (CE2019B01) MSZ-EF25-50VG MUZ-EF25-50VG Installation Manual (JG79J334H01) MUZ-EF25-50VG Parts List (OBB832) MUZ-EF25-50VG Service Manual (OBH832)

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