Mitsubishi Electric MUZ-HJ25VA-E2 Service Manual

Outdoor unit

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OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-HJ25VA

MUZ-HJ35VA

MUZ-HJ50VA

MUZ-HJ60VA

MUZ-HJ71VA

MUZ-HJ25VA

MUZ-HJ35VA

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

ER1

ER2

ER1

ER3

ER1

ER2

ER1

ET1

ER1

ET1

CONTENTS

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

2. PART NAMES AND FUNCTIONS ··················4

3. SPECIFICATION ········································5

4. NOISE CRITERIA CURVES ··························8

5. OUTLINES AND DIMENSIONS ··················· 10

6. WIRING DIAGRAM ··································· 12

7. REFRIGERANT SYSTEM DIAGRAM ··········· 16

8. PERFORMANCE CURVES ························ 18

9. ACTUATOR CONTROL ····························· 34

10. SERVICE FUNCTIONS ······························ 35

11. TROUBLESHOOTING ······························· 36

12. DISASSEMBLY INSTRUCTIONS ················· 56

PARTS CATALOG (OBB648)

Revision F:

• "How to check miswiring and serial signal

error" has been corrected (11-5. M ).

OBH648 REVISED EDITION-E is void.

No. OBH648

HFC

REVISED EDITION-F

utilized

R410A

ET1

ET2

ET1

ET2

ET1

ET2

Indoor unit service manual

MSZ-HJ•VA Series (OBH647)

Table of Contents

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Summary of Contents for Mitsubishi Electric MUZ-HJ25VA-E2

Page 1: Table Of Contents
Revision F: • "How to check miswiring and serial signal error" has been corrected (11-5. M ). OBH648 REVISED EDITION-E is void. OUTDOOR UNIT No. OBH648 SERVICE MANUAL REVISED EDITION-F utilized R410A Models MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA Indoor unit service manual MSZ-HJ•VA Series (OBH647) CONTENTS MUZ-HJ25VA...
Page 2 Use the speciﬁ ed 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
TECHNICAL CHANGES MUZ-HJ25VA - MUZ-HJ35VA - MUZ-HJ50VA - 1. New model MUZ-HJ25VA - MUZ-HJ35VA - MUZ-HJ50VA - 1. New model MUZ-HJ60VA - MUZ-HJ71VA - 1. New model MUZ-HJ25VA - MUZ-HJ25VA - MUZ-HJ35VA - MUZ-HJ35VA - MUZ-HJ50VA - MUZ-HJ50VA - MUZ-HJ60VA - MUZ-HJ60VA - MUZ-HJ71VA - MUZ-HJ71VA -...
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-HJ25VA MUZ-HJ35VA Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet MUZ-HJ50VA Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet MUZ-HJ60VA MUZ-HJ71VA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES...
Page 5: Specification
SPECIFICATION Outdoor model MUZ-HJ25VA MUZ-HJ35VA Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.3 - 3.0) 3.15 (1.4 - 3.5) Capacity Rated frequency (Min.-Max.) Heating 3.15 (0.9 - 3.5) 3.6 (1.1 - 4.1) Breaker Capacity Cooling 1,040 Power input 1 (Set) Heating Cooling Running current 1 (Set)
Page 6 Outdoor model MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA Power supply Single phase, 230 V, 50 Hz Cooling 5.0 (1.3 - 5.0) 6.1 (1.7-7.1) 7.1 (1.8-7.1) Capacity Rated frequency (Min.-Max.) Heating 5.4 (1.4 - 6.5) 6.8 (1.5-8.4) 8.1 (1.5-8.5) Breaker Capacity Cooling 2,050 1,900 2,330 Power input 1 (Set) Heating...
Page 7 Speciﬁ cations and rated conditions of main electric parts Model MUZ-HJ25VA MUZ-HJ35VA Item 800 μF 420 V Smoothing capacitor (C61) (DB61) 15 A 600 V Diode module (DB65) 10 A 600 V Fuse (F701, F801) T3.15AL250V Power module (IC700) 8 A 600 V 10 A 600 V Expansion valve coil (LEV)
Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-HJ25VA MUZ-HJ35VA 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-HJ50VA Test conditions...
Page 9 MUZ-HJ60VA MUZ-HJ71VA 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 Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C...
Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-HJ25VA MUZ-HJ35VA Unit : mm REQUIRED SPACE Air in *1 100 mm or more when front and sides of the unit are clear Drain hole ø33 Air in Air out 2 - 10.3 X 19.3 Oval hole 349.5 17.9 *2 When any 2 sides of left, right...
Page 11 Unit : mm MUZ-HJ60VA MUZ-HJ71VA REQUIRED SPACE *1 500 mm or more when front and sides of the unit are clear 417.5 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...
Page 12: Wiring Diagram
WIRING DIAGRAM MUZ-HJ25VA - MUZ-HJ25VA - OBH648F...
Page 13 MUZ-HJ35VA - MUZ-HJ35VA - OBH648F...
Page 14 MUZ-HJ50VA - MUZ-HJ50VA - MUZ-HJ60VA - MUZ-HJ71VA - OBH648F...
Page 15 MUZ-HJ60VA - MUZ-HJ71VA - OBH648F...
Page 16: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit : mm MUZ-HJ25VA MUZ-HJ35VA 4-way valve Refrigerant pipe ø9.52 Muffler (with heat insulator) (HJ35 only) Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature thermistor RT62 Compressor Defrost thermistor RT61 Strainer #100 Flared connection Capillary tube ø...
Page 17 Unit: mm MUZ-HJ60VA MUZ-HJ71VA 4-way valve Refrigerant pipe ø 15.88 (with heat insulator) Muffler #100 Stop valve Outdoor Flared connection Discharge heat temperature exchanger thermistor Defrost RT62 thermistor RT61 Compressor Outdoor heat exchanger Capillary tube temperature thermistor ø3.0×ø2.0×200(×4) RT68 Flared connection Muffler Strainer Strainer...
Page 18: Performance Curves
PERFORMANCE CURVES MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA 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 19 8-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) 11.4 10.4 10.5 Outdoor intake air Dry-bulb temperature (°C) Total input (Cooling :at Rated frequency) Outdoor intake air Dry-bulb temperature (°C) Heating capacity Total input (at Rated frequency) (Heating at Rated frequency) 20.6 22.9 24.7...
Page 20 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HJ25VA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-HJ35VA...
Page 21 8-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation> 1. Press 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 22 Outdoor unit current MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA (°C) (°C) (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-HJ60VA MUZ-HJ71VA (°C) (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor...
Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ25VA CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 2.09 0.71 2.81 2.00...
Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ25VA CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.74 0.71 2.25 1.60 0.71 2.08 1.47...
Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ35VA CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.70 2.55 0.69 3.54 2.45...
Page 26 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ35VA CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.09 2.13 0.69 1019 2.84 1.96 0.69 1082...
Page 27 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ50VA CAPACITY: 5.0 kW SHF: 0.70 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.06 0.52 1640 5.63 2.93 0.52 1722 5.40 2.81 0.52 1804 5.20...
Page 28 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ50VA CAPACITY: 5.0 kW SHF: 0.70 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.55 0.52 2009 4.50 2.34 0.52 2132 4.15 2.16 0.52 2214 5.15 2.06...
Page 29 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ60VA CAPACITY: 6.1 kW SHF: 0.82 INPUT: 1900 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 7.17 4.59 0.64 1520 6.86 4.39 0.64 1596 6.59 4.22 0.64 1672 6.34...
Page 30 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ60VA CAPACITY: 6.1 kW SHF: 0.82 INPUT: 1900 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 5.98 3.83 0.64 1862 5.49 3.51 0.64 1976 5.06 3.24 0.64 2052 6.28 3.27...
Page 31 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ71VA CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 8.34 4.92 0.59 1864 7.99 4.71 0.59 1957 7.67 4.52 0.59 2050 7.38...
Page 32 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HJ71VA CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 6.96 4.11 0.59 2283 6.39 3.77 0.59 2423 5.89 3.48 0.59 2516 7.31 3.44...
Page 33 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-HJ25VA CAPACITY: 3.15 kW INPUT: 870 W 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...
Page 34: Actuator Control
ACTUATOR CONTROL MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA 9-1. 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 35: Service Functions
SERVICE FUNCTIONS MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA 10-1. CHANGE IN DEFROST SETTING <JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.) Defrost ﬁ nish temperature (°C) Jumper wire MUZ-HJ25/35VA MUZ-HJ50VA MUZ-HJ60/71VA...
Page 36: Troubleshooting
TROUBLESHOOTING MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA 11-1. 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 37 11-2. 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 (11-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
Page 38 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 39 NOTE: Blinking patterns of this mode differ from the ones of 3. Outdoor unit failure recall mode table TROUBLESHOOTING CHECK TABLE (11-3.). The 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.
Page 40 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.). The 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 41 11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time ﬂ ash 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, or failure of sor.
Page 42 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 7-time ﬂ ash Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 11-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •...
Page 43 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA Part name Check method and criterion Figure Defrost thermistor (RT61) MUZ-HJ50VA Measure the resistance with a tester. MUZ-HJ60VA MUZ-HJ71VA Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. Outdoor heat exchanger board”, for the chart of thermistor.
Page 44 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the power module (IC700). See 11-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 11-5.
Page 45 C Check of compressor Refer to 11-5. “Check of compressor winding”. Replace the compressor. Is the compressor normal? Refer to 11-5. “Check of compressor operation time”. Refer to 11-5. “Check of compressor start failure”. Does the compressor operate continuously? D Check of compressor winding ●...
Page 46 F Check of compressor start failure Make sure that is normal. •Electrical circuit check . Contact of the compressor connector (Including CN61) . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-) on the inverter P.C. board .
Page 47 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 11-4. In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V.
Page 48 I Check of outdoor fan motor MUZ-HJ25VA MUZ-HJ35VA Check the resistance of fan motor. (Refer to 11-4.) Is the resistance of Replace the outdoor fan motor normal? fan motor. Disconnect the connector CN771 on the inverter P.C. board. Disconnect the connector (CN61) between compressor and power transistor module.
Page 49 250 - 370 VDC J Check of power supply Disconnect the connector (CN61) DB61 between compressor and power module. Turn ON power supply and press Rectify indoor/outdoor connecting wire. EMERGENCY OPERATION switch. Inverter P.C. board (Solder side) Is there voltage 230 VAC Replace the indoor Does the upper lamp of OPERATION between the indoor terminal...
Page 50 L Check of inverter P.C. board MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA Check the outdoor fan motor. (Refer to 11-5. .) 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.
Page 51 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? 1. Turn ON the power supply. MSZ-HJ25/35/50- 2. Press the emergency operation switch. Has the relay 52C been turned on 3 minuets later ? [The relay will be turned on in 3 to 7 seconds by bridging the timer short mode point (Refer to the indoor unit service manual.).] Initializing the determination of the power...
Page 52 N Check of 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 53 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 54 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-HJ25VA MUZ-HJ35VA Back side of unit Output to drive outdoor R.V. coil fan motor (CN771) (CN721) Smoothing Fuse (F801) DB61 230 VAC capacitor (C61) T3.15AL250V Fuse (F701) 250 V - 370 VDC T3.15AL250V Output to drive...
Page 55 MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA Smoothing Smoothing Smoothing R.V.coil capacitor capacitor capacitor (CN721) DB61 Back side of unit (C63) (C62) (C61) 230 VAC 250 - 370 VDC Fuse (F701) T3.15AL250V Fuse (F801) 230 VAC T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) 230 VAC...
Page 56: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 types (refer to (1) and (2)) 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 57 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 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 58 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the discharge temperature thermistor and the defrost thermistor Suction pipe brazed part (1) Remove the cabinet and the panels. (Refer to 1.) R.V. coil (2) Disconnect the lead wire to the reactor and the follow- ing connectors: <Inverter P.C.
Page 59 12-2. MUZ-HJ50VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet and the panels Photo 1 (1) Remove the screw fixing the service panel. Screws of the (2) Pull down the service panel and remove it. Screws of top panel (3) Disconnect the power supply and indoor/outdoor con-...
Page 60 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and the panels. (Refer to 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 61 OPERATING PROCEDURE PHOTOS 5. Removing the outdoor fan motor Photo 6 (1) Remove the cabinet and the panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Outdoor heat CN931, CN932 (Fan motor) exchanger tempera- (3) Remove the fan motor lead wire from where it is fastened on ture thermistor the separator.
Page 62 12-3. MUZ-HJ60VA MUZ-HJ71VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 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 63 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screws of the terminal (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors:...
Page 64 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat ture thermistor and ambient temperature thermistor exchanger tempera- Ambient tem- ture thermistor (1) Remove the cabinet and panels. (Refer to 1.) perature thermistor (2) Disconnect the lead wire to the reactor and the following...
Page 65 OBH648F...
Page 66 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Issued: Jul. 2016. No. OBH648 REVISED EDITION-F Issued: Dec. 2015. No. OBH648 REVISED EDITION-E Issued: Oct. 2014. No. OBH648 REVISED EDITION-D Issued: Aug. 2014. No. OBH648 REVISED EDITION-C Issued: Dec.

Mitsubishi Electric MUZ-HJ25VA-E2 Service Manual

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