Mitsubishi Electric MUZ-RW25VGHZ-E1 Service Manual
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Mitsubishi Electric MUZ-RW25VGHZ-E1 Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-RW25VGHZ
MUZ-RW35VGHZ
MUZ-RW50VGHZ
MUZ-RW25VGHZ
MUZ-RW35VGHZ
HFC
utilized
R32
-
E1
,
SC1
-
E1
,
SC1
-
E1
,
SC1
Indoor unit service manual
MSZ-RW•VG Series (OBH902)
CONTENTS
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 ··································· 11
8. REFRIGERANT SYSTEM DIAGRAM ··········· 12
9. PERFORMANCE CURVES ························· 14
10. ACTUATOR CONTROL ····························· 25
11. SERVICE FUNCTIONS ······························ 26
12. TROUBLESHOOTING ······························· 27
13. DISASSEMBLY INSTRUCTIONS ················· 48
PARTS CATALOG (OBB903)
No. OBH903

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  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OBH903 utilized SERVICE MANUAL Models MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ Indoor unit service manual MSZ-RW•VG Series (OBH902) CONTENTS 1. TECHNICAL CHANGES ······························ 2 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ························· 3 3. PART NAMES AND FUNCTIONS ·················· 5 4.

  • Page 2: Technical Changes

    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.

  • 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 recalibration.

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-RW25VGHZ MUZ-RW35VGHZ Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet MUZ-RW50VGHZ Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet OBH903...

  • Page 6: Specification

    SPECIFICATION MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ Outdoor model Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.9 - 3.5) 3.5 (1.0 - 4.0) 5.0 (1.4 - 5.8) Capacity Rated (Min.-Max.) Heating 3.2 (0.8 - 6.3) 4.0 (1.1 - 7.0) 6.0 (1.8 - 8.7) Breaker Capacity Cooling 1,380...
  • Page 7 Specifications and rated conditions of main electric parts Model MUZ-RW25VGHZ MUZ-RW35VGHZ Item Smoothing capacitor (C61, C62, C63) 620 µF 420 V Diode module (DB61, DB65) 25 A 600 V (F701, F801, F901) T3.15AL250V Fuse (F61) 25 A 250 V (F62) 15 A 250 V Defrost heater 230 V 60 W...

  • Page 8: Noise Criteria Curves

    NOISE CRITERIA CURVES MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW25VGHZ-SC1 MUZ-RW35VGHZ-SC1 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 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MUZ-RW50VGHZ-SC1 MUZ-RW50VGHZ...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-RW25VGHZ Unit: mm MUZ-RW35VGHZ OBH903...
  • Page 10 MUZ-RW50VGHZ Unit: mm REQUIRED SPACE FLARED ø6.35 (1/4”) FLARED ø9.52 (3/8”) OBH903...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ OBH903...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-RW25VGHZ Unit: mm MUZ-RW35VGHZ Refrigerant pipe ø9.52 (with heat insulator) 4-way valve Muffler Stop valve Muffler Defrost Outdoor thermistor Flared connection Discharge heat Ambient RT61 temperature exchanger temperature Capillary tube thermistor thermistor ø3.0×ø2.0×210 (x 2) RT62 RT65 Compressor Outdoor heat exchanger...
  • Page 13 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-RW25VGHZ 9.52 6.35 MUZ-RW35VGHZ MUZ-RW50VGHZ 9.52 6.35 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R32: g) Refrigerant piping length (one way) Outdoor unit...

  • Page 14: Performance Curves

    PERFORMANCE CURVES MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ 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 9-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb 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 14.8...
  • Page 16 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-RW25VGHZ 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) of compressor (Hz)
  • 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-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm...
  • Page 18 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW25VGHZ CAPACITY: 2.5 kW SHF: 0.99 INPUT: 435 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.38 0.81 2.81 2.28 0.81 2.70 2.19 0.81 2.60 2.11 0.81 3.06 2.11...
  • Page 19 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW25VGHZ CAPACITY: 2.5 kW SHF: 0.99 INPUT: 435 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.98 0.81 2.25 1.82 0.81 2.08 1.68 0.81 2.58 1.78 0.69 2.40 1.66 0.69...
  • Page 20 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW35VGHZ CAPACITY: 3.5 kW SHF: 0.94 INPUT: 770 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 3.13 0.76 3.94 2.99 0.76 3.78 2.87 0.76 3.64 2.77 0.76 4.29 2.74...
  • Page 21 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW35VGHZ CAPACITY: 3.5 kW SHF: 0.94 INPUT: 770 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.61 0.76 3.15 2.39 0.76 2.91 2.21 0.76 3.61 2.31 0.64 3.36 2.15 0.64...
  • Page 22 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW50VGHZ CAPACITY: 5.0 kW SHF: 0.82 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.76 0.64 1104 5.63 3.60 0.64 1159 5.40 3.46 0.64 1214 5.20 3.33...
  • Page 23 PERFORMANCE DATA COOL operation at Rated frequency MUZ-RW50VGHZ CAPACITY: 5.0 kW SHF: 0.82 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 3.14 0.64 1352 4.50 2.88 0.64 1435 4.15 2.66 0.64 1490 5.15 2.68 0.52...
  • Page 24 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-RW25VGHZ CAPACITY: 3.2 kW INPUT: 580 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 0.39 0.80 157 1.22 232 1.60 302 2.02 377 2.43 452 2.85 510 3.26 551 3.68 586 4.06 603 4.48 615 0.34 0.74 168 1.12 244 1.50 319 1.92 406 2.30 481 2.72 534 3.10 574 3.52 603 3.90 621 4.30 644 0.11 102 0.51 186 0.90 261 1.31 348 1.73 435 2.14 510 2.53 563 2.94 603 3.36 632 3.74 650 4.16 667...

  • Page 25: Actuator Control

    ACTUATOR CONTROL MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ 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. 5 seconds 15 seconds Compressor...

  • Page 26: Service Functions

    SERVICE FUNCTIONS MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ 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-RW25/35VGHZ MUZ-RW50VGHZ Soldered (Initial setting)

  • Page 27: Troubleshooting

    TROUBLESHOOTING MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ 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 28 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 29 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 30 NOTE: Blinking patterns of this mode differ from the ones of 3. Table of outdoor unit failure mode recall function TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit POWER lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C.
  • Page 31 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit POWER 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 32 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
  • Page 33 Abnormal point/ Symptom LED indication Condition Remedy Condition MUZ-RW25/35 Outside temperature When the outside temperature thermistor shorts or opens, pro- • Refer to 12-5. Check of outdoor 5-time blink thermistor protection tective operation without that thermistor is performed. thermistors. 2.5 seconds OFF Outdoor unit 7-time blink Low discharge tem-...
  • Page 34 12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (RT61) Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. Fin temperature board”, for the chart of thermistor. thermistor (RT64) Ambient temperature thermistor (RT65)
  • Page 35 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 36 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 37 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 (Refer to 12-6.1.) inverter P.C.
  • Page 38 H Check of R.V. coil MUZ-RW25/35VGHZ * 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 39 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 terminal of outdoor fan motor normal? (Refer to 12-4.) Disconnect CN932 from the inverter P.C.
  • Page 40 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. Is there voltage 230 V AC Replace the indoor Does POWER lamp on the indoor between the indoor terminal electronic control P.C.
  • Page 41 MSZ-RW25/35/50VG - MSZ-RW25/35/50VG - K Check of LEV (Expansion valve) 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.
  • Page 42 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 43 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. 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 44 N Check of the outdoor refrigerant circuit The operation has stopped to prevent the diesel explosion Has the operation stopped during pump down? caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn the breaker OFF. CAUTION: Do not start the operation again to prevent hazards.
  • Page 45 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 46 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-RW25VGHZ MUZ-RW35VGHZ Back side of unit Smoothing Smoothing Smoothing R.V.coil DB61 capacitor capacitor capacitor (CN721) 260 - 370 V DC (C61) (C62) (C63) 230 V AC 230 V AC Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V...
  • Page 47 MUZ-RW50VGHZ Back side of unit Smoothing Smoothing Smoothing Output to drive Capacitor Capacitor Capacitor Fuse (F880) outdoor fan motor Heater (CN601) (CB1) (CB2) (CB3) T3.15AL250V (CN932) 230 V AC Fuse (F601) T3.15AL250V 230 V AC R.V. coil/ 21S4 (CN602) 230 V AC Fuse (F62) 15 A 250 V Fuse (F901)

  • Page 48: 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 49 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 board Screw of the heat sink Screw of the P.B. support support and the separator and the separator (1) Remove the cabinet and panels (refer to section 1). Screws of (2) Disconnect the lead wire to the reactor and the following the terminal block...
  • Page 50 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 7 (1) Remove the cabinet and panels (refer to section 1). Screw of the (2) Disconnect the following connectors: R.V. coil <Inverter P.C. board> Discharge CN721 (R.V. coil) temperature (3) Remove the R.V. coil. thermistor Compressor protector...
  • Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 10 (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 52 13-2. MUZ-RW50VGHZ 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 53 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 54 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 55 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 8 Outdoor heat exchanger defrost thermistor, outdoor heat exchanger tempera- temperature thermistor ture thermistor and ambient 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 56 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Published: Jul. 2021. No. OBH903 Made in Japan Specifications are subject to change without notice.

This manual is also suitable for:

Muz-rw25vghz-sc1Muz-rw35vghz-e1Muz-rw35vghz-sc1Muz-rw50vghz-e1Muz-rw50vghz-sc1

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