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Mitsubishi Electric MUZ-HR25VF Service Manual
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Mitsubishi Electric MUZ-HR25VF Service Manual

Outdoor unit
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-HR25VF
MUZ-HR35VF
MUZ-HR42VF
MUZ-HR50VF
MUZ-HR42VF
MUZ-HR50VF
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ER1
ET1
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ER1
ET1
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CONTENTS
1. TECHNICAL CHANGES ··································· 2
USING REFRIGERANT R32 ····························· 3
3. PART NAMES AND FUNCTIONS ····················· 5
4. SPECIFICATION ················································ 6
5. NOISE CRITERIA CURVES ······························ 7
6. OUTLINES AND DIMENSIONS ························ 9
7. WIRING DIAGRAM ·········································· 10
8. REFRIGERANT SYSTEM DIAGRAM ············· 12
9. PERFORMANCE CURVES ····························· 14
10. ACTUATOR CONTROL ··································· 28
11. SERVICE FUNCTIONS ···································· 29
12. TROUBLESHOOTING ····································· 30
13. DISASSEMBLY INSTRUCTIONS ···················· 51
PARTS CATALOG (OBB823)
No. OBH823
HFC
utilized
R32
Indoor unit service manual
MSZ-HR·VF Series (OBH822)

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Summary of Contents for Mitsubishi Electric MUZ-HR25VF

  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OBH823 utilized SERVICE MANUAL Models MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF Indoor unit service manual MSZ-HR·VF Series (OBH822) CONTENTS MUZ-HR42VF 1. TECHNICAL CHANGES ··································· 2 MUZ-HR50VF 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ····························· 3 3. PART NAMES AND FUNCTIONS ····················· 5 4.

  • 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-HR25VF - MUZ-HR35VF - MUZ-HR42VF - MUZ-HR50VF - 1.

  • 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-HR25VF MUZ-HR42VF MUZ-HR35VF MUZ-HR50VF Air inlet Air inlet (back and side) (Back and side) Piping Piping Drain hose Air outlet Air outlet Drain hose Drain outlet Drain outlet ACCESSORIES MUZ-HR25VF MUZ-HR35VF MODELS MUZ-HR42VF MUZ-HR50VF Drain socket...

  • Page 6: Specification

    SPECIFICATION Outdoor model MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF Power supply Single phase, 230 V, 50 Hz Cooling 2.5(0.5-2.9) 3.4(0.9-3.4) 4.2 (1.1 - 4.5) 5.0 (1.3 - 5.0) Capacity Rated frequency (Min.-Max.) Heating 3.15(0.5-3.5) 3.6(0.9-3.7) 4.7(0.9-5.4) 5.4 (1.4 - 6.5) Breaker Capacity...

  • Page 7: Noise Criteria Curves

    Specifications and rated conditions of main electric parts Model MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF Item (C61) — 600 µF/ 620 µF 420 V Smoothing (C62) 800 µF 420 V 600 µF/ 620 µF 420 V capacitor (C63) — 600 µF/ 620 µF 420 V...
  • Page 8 MUZ-HR42VF MUZ-HR50VF 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 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-HR25VF MUZ-HR35VF Unit: mm MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF OBH823...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MUZ-HR25VF - MUZ-HR35VF - MUZ-HR25VF - MUZ-HR35VF - OBH823...
  • Page 11 MUZ-HR42VF - MUZ-HR50VF - MUZ-HR42VF - MUZ-HR50VF - OBH823...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-HR25VF MUZ-HR35VF Unit: mm Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62 Ambient Compressor temperature...
  • Page 13 12 m 13 m 14 m 15 m 20 m MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF 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-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF 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 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 20.4 22.9 22.4 24.4 18.8 21.2 22.5 20.7 17.3 19.4 20.6 19.0 15.7 17.2 17.6 18.7 14.1 15.5 15.9...
  • Page 16 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HR25VF 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)
  • Page 17 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-HR25VF MUZ-HR35VF MUZ-HR42VF (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) Ambient temperature(°C)
  • Page 18 Outdoor unit current MUZ-HR35VF MUZ-HR42VF MUZ-HR25VF Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-HR50VF 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-HR25VF CAPACITY: 2.5 kW SHF: 0.78 INPUT: 800 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 1.76 0.60 2.81 1.69 0.60 2.70 1.62 0.60 2.60 1.56...
  • Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR25VF CAPACITY: 2.5 kW SHF: 0.78 INPUT: 800 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.47 0.60 2.25 1.35 0.60 2.08 1.25 0.60 2.58 1.24 0.48...
  • Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR35VF CAPACITY: 3.4 kW SHF: 0.78 INPUT: 1210 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.00 2.40 0.60 3.83 2.30 0.60 1016 3.67 2.20 0.60 1065 3.54 2.12...
  • Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR35VF CAPACITY: 3.4 kW SHF: 0.78 INPUT: 1210 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.33 2.00 0.60 1186 3.06 1.84 0.60 1258 2.82 1.69 0.60 1307 3.50 1.68...
  • Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR42VF CAPACITY: 4.2 kW SHF: 0.74 INPUT: 1340 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.76 0.56 1072 4.73 2.65 0.56 1126 4.54 2.54 0.56 1179 4.37...
  • Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR42VF CAPACITY: 4.2 kW SHF: 0.74 INPUT: 1340 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.30 0.56 1313 3.78 2.12 0.56 1394 3.49 1.95 0.56 1447 4.33 1.90...
  • Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR50VF CAPACITY: 5.0 kW SHF: 0.73 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.23 0.55 1640 5.63 3.09 0.55 1722 5.40 2.97 0.55 1804 5.20...
  • Page 26 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HR50VF CAPACITY: 5.0 kW SHF: 0.73 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.70 0.55 2009 4.50 2.48 0.55 2132 4.15 2.28 0.55 2214 5.15 2.21...
  • Page 27 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-HR25VF CAPACITY: 3.15 kW INPUT: 850W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.98 2.39 2.80 3.21 3.62 4.00 4.41 1.89 2.27 2.68 3.06 3.47 3.84 4.24 1.70...

  • Page 28: Actuator Control

    ACTUATOR CONTROL MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF 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-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF 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 finish temperature (°C)

  • Page 30: Troubleshooting

    TROUBLESHOOTING MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF 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.). The left lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection)
  • Page 34 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). The left Indoor/outdoor lamp of Outdoor unit Abnormal point LED indication unit failure OPERATION Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp function...
  • 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 P.C. thermistor (RT65) board”, for the chart of thermistor.
  • Page 38 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”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. 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>> Refer to 12-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
  • 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 left lamp of OPERATION Is there voltage 230 V AC Replace the indoor INDICATOR lamp on the indoor unit between the indoor terminal...
  • Page 44 K Check of LEV (Expansion valve) MSZ-HR·VF Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL 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 OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
  • 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-HR25VF MUZ-HR35VF Back side of unit R.V. coil/21S4 Fuse (F901) (CN721) Smoothing Fuse (F801) DB61 T3.15AL250V 230 V AC capacitor (C62) T3.15AL250V Fuse (F701) 250 V - 370 V DC T3.15AL250V...
  • Page 50 1. Inverter P.C. board MUZ-HR42VF MUZ-HR50VF R.V.coil/21S4 Smoothing Smoothing Smoothing (CN721) DB61 capacitor Back side of unit capacitor (C61) capacitor 230 V AC 260 - 370 V DC (C62) (C63) 230 V AC Fuse (F801) Fuse (F901) Fuse (F701) T3.15AL250V T3.15AL250V T3.15AL250V Fuse (F62)

  • Page 51: Disassembly Instructions

    Locking lever lever. Connector 13-1. MUZ-HR25VF MUZ-HR35VF : Indicates the visible parts in the photos. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos. OPERATING PROCEDURE PHOTOS Photo 1 1.
  • Page 52 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the inverter assembly, inverter P.C. board Screws of the terminal Screw of the heat (1) Remove the cabinet and the panels. (Refer to section 1.) block support and the sink support and (2) Disconnect the lead wire to the reactor and the follow- back panel the separator ing connectors:...
  • Page 53 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the discharge temperature thermistor, Suction pipe brazed part the defrost thermistor, the ambient temperature R.V. coil thermistor and the outdoor heat exchanger tem- perature thermistor (1) Remove the cabinet and the panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the follow- ing connectors: <Inverter P.C.
  • Page 54 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and the 4-way valve Photo 9 (1) Remove the cabinet and the panels. (Refer to section 1.) 4-way valve Suction pipe (2) Remove the inverter assembly. (Refer to section 2.) brazed part brazed part (3) Remove the screws of the reactor and remove the reactor.
  • Page 55 13-2. MUZ-HR42VF MUZ-HR50VF NOTE: Turn OFF the power supply before disassembly. Photos: MUZ-HR42VF OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. Screws of the Back (2) Pull down the service panel and remove it. top panel panel (3) Disconnect the power supply cord and indoor/outdoor...
  • Page 56 OPERATING PROCEDURE PHOTOS 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 57 OPERATING PROCEDURE PHOTOS 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 58 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Published: Oct. 2018. No. OBH823 Made in Japan Specifications are subject to change without notice.

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