Mitsubishi Electric MUZ-HR50VF-E4 Service Manual

Outdoor unit

Hide thumbs Also See for MUZ-HR50VF-E4:

Service manual (84 pages)

page of 85

/ 85
Bookmarks

Quick Links

Download this manual

OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-HR25VF

MUZ-HR35VF

MUZ-HR42VF

MUZ-HR50VF

MUZ-HR60VF

MUZ-HR71VF

MUZ-HR42VF

MUZ-HR50VF

ER1

ET1

ER2

ER1

ET1

ER2

ER1

ET1

ER2

ER1

ET1

ER2

ER1

ET1

ER2

ER1

ET1

ER2

CONTENTS

1. TECHNICAL CHANGES ······························3

2. SERVICING PRECAUTIONS FOR UNITS

USING REFRIGERANT R32 ·························4

3. PART NAMES AND FUNCTIONS ··················6

4. SPECIFICATION ········································7

5. NOISE CRITERIA CURVES ··························9

6. OUTLINES AND DIMENSIONS ··················· 11

7. WIRING DIAGRAM ··································· 13

8. REFRIGERANT SYSTEM DIAGRAM ··········· 22

9. PERFORMANCE CURVES ························· 24

10. ACTUATOR CONTROL ····························· 43

11. SERVICE FUNCTIONS ······························ 44

12. TROUBLESHOOTING ······························· 44

13. DISASSEMBLY INSTRUCTIONS ················· 68

PARTS CATALOG (OBB823)

Revision J:

• MUZ-HR25/35/42/50VF-

been added.

OBH823 REVISED EDITION-H is void.

No. OBH823

HFC

utilized

REVISED EDITION-J

R32

ET2

ER3

ET3

ET2

ER3

ET3

ET2

ER3

ET3

ET2

ER3

ET3

ET2

Indoor unit service manual

MSZ-HR∙VF Series (OBH822)

have

ET4

Need help?

Do you have a question about the MUZ-HR50VF-E4 and is the answer not in the manual?

Questions and answers

Summary of Contents for Mitsubishi Electric MUZ-HR50VF-E4

Page 1 Revision J: • MUZ-HR25/35/42/50VF- have been added. OBH823 REVISED EDITION-H is void. OUTDOOR UNIT No. OBH823 utilized REVISED EDITION-J SERVICE MANUAL Models MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF Indoor unit service manual MSZ-HR∙VF Series (OBH822) CONTENTS 1. TECHNICAL CHANGES ······························3 2.
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.
Page 3 TECHNICAL CHANGES MUZ-HR25VF - MUZ-HR35VF - MUZ-HR42VF - MUZ-HR50VF - MUZ-HR60VF - MUZ-HR71VF - 1. New model MUZ-HR25VF - MUZ-HR25VF - MUZ-HR35VF - MUZ-HR35VF - MUZ-HR42VF - MUZ-HR42VF - MUZ-HR50VF - MUZ-HR50VF - MUZ-HR60VF - MUZ-HR60VF - MUZ-HR71VF - MUZ-HR71VF - 1.
Page 4 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.
Page 6 PART NAMES AND FUNCTIONS MUZ-HR25VF MUZ-HR35VF Air inlet (Back) (Back and side) Piping Drain hose Air outlet Drain outlet MUZ-HR42VF MUZ-HR60VF MUZ-HR50VF MUZ-HR71VF Air inlet (Back and side) Air inlet (Back and side) Piping Piping Air outlet Air outlet Drain hose Drain hose Drain outlet Drain outlet...
Page 7 SPECIFICATION MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF Outdoor model 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) 6.1 (1.7-7.4) 7.1 (1.8-7.4) Capacity Rated (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) 6.8 (1.5-9.0) 8.1 (1.5-9.0) Breaker Capacity Cooling 1,210...
Page 8 Specifications and rated conditions of main electric parts Model MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF Item — (C61) 600 µF/ 620 µF 420 V 600 µF/ 620 µF 420 V 800 µF 420 V Smoothing capacitor 800 µF 420 V (C62) 600 µF/ 620 µF 420 V 600 µF/ 620 µF 420 V...
Page 9 NOISE CRITERIA CURVES MUZ-HR25VF FUNCTION SPL(dB(A)) LINE COOLING HEATING NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 NC-10 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MUZ-HR35VF - MUZ-HR35VF - FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50...
Page 10 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 MUZ-HR60VF MUZ-HR71VF FUNCTION SPL(dB(A))
Page 11 OUTLINES AND DIMENSIONS MUZ-HR25VF MUZ-HR35VF Unit: mm MUZ-HR25VF MUZ-HR35VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF Unit: mm OBH823J...
Page 12 MUZ-HR60VF MUZ-HR71VF Unit: mm MUZ-HR60/71VF OBH823J...
Page 13 WIRING DIAGRAM MUZ-HR25VF - MUZ-HR35VF - MUZ-HR25VF - MUZ-HR35VF - OBH823J...
Page 14 MUZ-HR25VF - MUZ-HR35VF - 21S4 LD70 LD66A F701 CN721 DB61 LD63 DB65 T801 LD-E2 LD66B F801 IC802 Q821 F901 TAB62 LD-E1 INVERTER CIRCUIT TAB72 LD71 PTC64 TAB61 P.C. BOARD CN932 BREAKER CN61 3 IC932 230V 50Hz IC700 POWER SUPPLY CN931 CN642 CN643 CN644 CN641...
Page 15 MODEL MUZ-HR25/35VF WIRING DIAGRAM MUZ-HR25VF - MUZ-HR35VF - JG79N601H02 E4 / ER4 21S4 LD66A LD70 F701 CN721 DB61 LD63 DB65 T801 LD-E2 LD66B F801 IC802 Q821 F901 TAB62 LD-E1 INVERTER CIRCUIT TAB72 LD71 PTC64 TAB61 P.C. BOARD BREAKER CN932 CN61 3 230V 50Hz IC700 IC932...
Page 16 MUZ-HR42VF - MUZ-HR50VF - MUZ-HR42VF - MUZ-HR50VF - OBH823J...
Page 17 MUZ-HR42VF - MUZ-HR50VF - (*1) If there is no COMPRESSOR PROTECTOR(26C) 21S4 CN64 LD70 LD66A F701 CN721 LD63 DB61 DB65 T801 LD-E2 LD66B F801 IC802 Q821 F901 TAB62 PTC64 LD-E1 INVERTER P.C. BOARD CIRCUIT TAB72 LD71 PTC65 TAB61 CN932 BREAKER CN61 IC700 IC932...
Page 18 MUZ-HR42VF - MUZ-HR50VF - MODEL MUZ-HR42/50VF WIRING DIAGRAM JG79N696H02 (*1) If there is no COMPRESSOR PROTECTOR(26C) 21S4 CN64 LD70 LD66A F701 CN721 LD63 DB61 DB65 T801 LD-E2 LD66B F801 IC802 Q821 F901 TAB62 PTC64 LD-E1 INVERTER P.C. BOARD CIRCUIT TAB72 LD71 PTC65 TAB61...
Page 19 MUZ-HR60VF - MUZ-HR71VF - MUZ-HR60VF - MUZ-HR71VF - OBH823J...
Page 20 MUZ-HR60VF - MUZ-HR71VF - MUZ-HR60VF - MUZ-HR71VF - OBH823J...
Page 21 MUZ-HR60VF - MUZ-HR71VF - OBH823J...
Page 22 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 Muffler Outdoor Discharge RT68 Flared connection heat temperature exchanger thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost...
Page 23 MUZ-HR60VF MUZ-HR71VF Unit: mm Refrigerant pipe ø12.7 (with heat insulator) 4-way valve Muffler Outdoor heat exchanger temperature Stop valve thermistor Outdoor RT68 heat Muffler Discharge exchanger Flared connection temperature thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost thermistor RT61 Capillary tube ø3.0×ø2.0×210 (x2) Strainer #100...
Page 24 PERFORMANCE CURVES MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF 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 oper- ating characteristics of the air conditioner under the conditions indicated by the performance curve.
Page 25 9-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) 11.2 10.5 Indoor intake air Wet-bulb 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) 20.4...
Page 26 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HR25VF Correction of Cooling input Correction of Heating capacity Correction of Cooling 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 27 MUZ-HR60VF 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 of compressor (Hz) of compressor (Hz) of compressor (Hz) of compressor (Hz) MUZ-HR71VF Correction of Cooling input Correction of Heating capacity...
Page 28 9-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation> 1. Press the emergency operation switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4.
Page 29 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 MUZ-HR60VF MUZ-HR71VF Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor...
Page 30 PERFORMANCE DATA COOL operation at 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 0.60 3.06 1.47...
Page 31 PERFORMANCE DATA COOL operation at 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 2.40 1.15 0.48...
Page 32 PERFORMANCE DATA COOL operation at 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 0.60...
Page 33 PERFORMANCE DATA COOL operation at 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 0.48...
Page 34 PERFORMANCE DATA COOL operation at 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 2.45...
Page 35 PERFORMANCE DATA COOL operation at 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 0.44...
Page 36 PERFORMANCE DATA COOL operation at 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 2.86...
Page 37 PERFORMANCE DATA COOL operation at 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 0.43...
Page 38 PERFORMANCE DATA COOL operation at Rated frequency MUZ-HR60VF CAPACITY: 6.1 kW SHF: 0.79 INPUT: 1810 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 7.17 4.37 0.61 1448 6.86 4.19 0.61 1520 6.59 4.02 0.61 1593 6.34 3.87...
Page 39 PERFORMANCE DATA COOL operation at Rated frequency MUZ-HR60VF CAPACITY: 6.1 kW SHF: 0.79 INPUT: 1810 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 5.98 3.65 0.61 1774 5.49 3.35 0.61 1882 5.06 3.09 0.61 1955 6.28 3.08 0.49...
Page 40 PERFORMANCE DATA COOL operation at Rated frequency MUZ-HR71VF CAPACITY: 7.1 kW SHF: 0.74 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 8.34 4.67 0.56 1864 7.99 4.47 0.56 1957 7.67 4.29 0.56 2050 7.38 4.14...
Page 41 PERFORMANCE DATA COOL operation at Rated frequency MUZ-HR71VF CAPACITY: 7.1 kW SHF: 0.74 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 6.96 3.90 0.56 2283 6.39 3.58 0.56 2423 5.89 3.30 0.56 2516 7.31 3.22 0.44...
Page 42 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 2.11 2.49...
Page 43 ACTUATOR CONTROL MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF 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 44 SERVICE FUNCTIONS MUZ-HR25VF MUZ-HR35VF MUZ-HR42VF MUZ-HR50VF MUZ-HR60VF MUZ-HR71VF 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) Soldered (Initial setting) None (Cut) 11-2.
Page 45 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 46 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 47 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/upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection)
Page 48 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). The left/upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp function...
Page 49 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 50 Outdoor unit 1-time blink Deceleration of the When the input current exceeds approximately 10A, compres- The unit is normal, but check the operates. 2.5 seconds OFF operational frequency sor frequency lowers. following. of the compressor by • Check if indoor filters are clogged. the current protection •...
Page 51 12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature thermistor Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, (RT64) for the chart of thermistor. Ambient temperature thermistor (RT65) Outdoor heat exchanger...
Page 52 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 53 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 54 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 55 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 56 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 left/upper lamp of Is there voltage 230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
Page 57 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 58 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 59 M How to check miswiring and serial signal error HR25/35/42/50VF 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 60 HR60/71VF Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again.
Page 61 N Check of the outdoor refrigerant circuit The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop Has the operation stopped during pump down? valve, and disconnect the power plug or turn the breaker OFF. CAUTION : Do not start the operation again to prevent hazards.
Page 62 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 63 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 Fuse (F62) Fuse (F61)
Page 64 MUZ-HR25VF - MUZ-HR35VF - Back side of unit DB61 Smoothing Fuse (F801) Fuse (F701) R.V. coil/21S4 230 V AC 250 V - 370 V DC capacitor (C61) T3.15AL250V T3.15AL250V (CN721) Fuse (F61) Fuse (F62) 15 A 250 V 15 A 250 V Output to drive 230 V AC...
Page 65 MUZ-HR42VF - MUZ-HR50VF - MUZ-HR60VF - MUZ-HR71VF - R.V. coil/21S4 Smoothing Smoothing Smoothing (CN721) DB61 capacitor (C61) capacitor Back side of unit capacitor 230 V AC 260 - 370 V DC (C62) (C63) 230 V AC Fuse (F801) Fuse (F901) Fuse (F701) T3.15AL250V T3.15AL250V...
Page 66 MUZ-HR42VF - MUZ-HR50VF - Smoothing Smoothing Smoothing R.V.coil/21S4 Back side of unit capacitor capacitor capacitor (CN721) DB61 (C61) (C62) (C63) 230 V AC 260 - 370 V DC 230 V AC Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V Fuse (F62) 15 A 250 V Output to drive compressor Fuse (F61)
Page 67 MUZ-HR60VF - MUZ-HR71VF - Back side of unit R.V.coil/21S4 Smoothing Smoothing Smoothing (CN721) DB61 capacitor capacitor capacitor 260 - 370 V DC (C61) (C62) (C63) 230 V AC 230 V AC Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V Fuse (F62) 15 A 250 V Output to drive compressor...
Page 68 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 69 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. Photo 4 board Screws of the terminal Screw of the heat (1) Remove the top panel, cabinet and service panel. (Refer block support and the sink support and to section 1.) back panel the separator (2) Disconnect the lead wire to the reactor and the follow-...
Page 70 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 6 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 71 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and the 4-way valve Photo 9 (1) Remove the cabinet and the panels. (Refer to section 1.) Suction pipe 4-way valve (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 72 13-2. MUZ-HR42VF MUZ-HR50VF NOTE: Turn OFF the power supply before disassembly. Photos: MUZ-HR42VF OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. Screws of the (2) Pull down the service panel and remove it. Back top panel (3) Disconnect the power supply cord and indoor/outdoor...
Page 73 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the top panel, cabinet and service panel. (Refer to Screws of the heat sink Screws of the terminal block section 1.) support and the separator support and the back panel (2) Disconnect the lead wire to the reactor and the following connectors:...
Page 74 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: Ambient temperature <Inverter P.C. board> thermistor CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
Page 75 13-3. MUZ-HR60VF - MUZ-HR71VF - 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 76 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 (1) Remove the cabinet and panels. (Refer to section 1.) support and the separator and the separator (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
Page 77 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 Photo 7...
Page 78 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 9 (1) Remove the cabinet and panels. (Refer to section 1.) Suction pipe Discharge 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 (0 MPa).
Page 79 13-4. MUZ-HR60VF - MUZ-HR71VF - 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 80 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 NOTE: Check the wiring layout either A, B or C in Photo 5 before removing the connectors as there are 3 types of the setting position of the compressor protector depending on production date.
Page 81 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 5 Wiring layout A, B or C board (Photo 5) If the wiring layout is C, change it to layout B. Lead wires of Lead wires of the Lead wires of 1.
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 (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 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.) Suction pipe Discharge 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 (0 MPa).
Page 84 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Aug. 2024. No. OBH823 REVISED EDITION-J Issued: Sep. 2023. No. OBH823 REVISED EDITION-H Issued: Aug. 2022. No. OBH823 REVISED EDITION-G Issued: Dec. 2021. No. OBH823 REVISED EDITION-F Issued: Oct.
Page 85 Related Links Model Number: MUZ-HR71VF MSZ-HR R32 Product Information Sheet MSZ-HR60-71VF Installation manual (JG79N173H01) MSZ-MUZ HR60-71VF Declaration of Conformity (UK2021B61) MUZ-HR25-50VF Parts List (OBB823J) MUZ-HR25-71VF Service Manual (OBH823H) MUZ-HR25-71VF Service Manual (OBH823J)

This manual is also suitable for:

Muz-hr25vf-er1 Muz-hr25vf-et1 Muz-hr25vf-e2 Muz-hr25vf-er2 Muz-hr25vf-et2 Muz-hr25vf-e3 ... Show all