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Mitsubishi Electric MUZ-FD25VABH - E1 Service Manual

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Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
SPLIT-TYPE AIR CONDITIONERS

SERVICE MANUAL

Models
MUZ-FD25VABH -
MUZ-FD35VABH -
MUZ-FD25/35
NOTE:
RoHS compliant products have mark on the spec name plate.
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 24
10. SERVICE FUNCTIONS ···································· 25
11. TROUBLESHOOTING ····································· 26
12. DISASSEMBLY INSTRUCTIONS ···················· 53
PARTS CATALOG (OBB519)
www.ilmalämpöpumput.com
No. OBH519
HFC
utilized
R410A
Indoor unit service manual
MSZ-FD•VA Series (OBH488)

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  Summary of Contents for Mitsubishi Electric MUZ-FD25VABH - E1

  • Page 1: Table Of Contents

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH519 SERVICE MANUAL utilized R410A Models MUZ-FD25VABH - MUZ-FD35VABH - MUZ-FD50VABH - Indoor unit service manual MSZ-FD•VA Series (OBH488) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3.
  • Page 2 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy www.ilmalämpöpumput.com...
  • Page 3: Technical Changes

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy TECHNICAL CHANGES MUZ-FD25VABH - MUZ-FD35VABH - MUZ-FD50VABH - 1. New model www.ilmalämpöpumput.com...
  • Page 4: Part Names And Functions

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PART NAMES AND FUNCTIONS MUZ-FD25VABH MUZ-FD35VABH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FD50VABH Air inlet (back and side) Piping Drain hose Air outlet www.ilmalämpöpumput.com...
  • Page 5: Specification

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy SPECIFICATION Outdoor model MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.1-3.5) 3.5 (0.8-4.0) 5.0 (1.5-5.8) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.5-6.3) 4.0 (1.3-6.6) 6.0 (1.5-8.2) Breaker Capacity Cooling 1,510...
  • Page 6 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy Specifi cations and rating conditions of main electric parts Model MUZ-FD25VABH MUZ-FD35VABH Item (CT) 20 A Current transformer (CT761, CT781) 15 A Smoothing capacitor (C61, C62, C63) 620 μF 420 V (DB61) 15 A 600 V Diode module (DB65)
  • Page 7: Noise Criteria Curves

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy NOISE CRITERIA CURVES MUZ-FD35VABH MUZ-FD25VABH 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...
  • Page 8: Outlines And Dimensions

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OUTLINES AND DIMENSIONS MUZ-FD25VABH MUZ-FD35VABH Unit : mm REQUIRED SPACE Basically open 100 mm or more without any obstruction in front and on both sides of the unit. Drain hole ø33 Air in Air in Open two sides of left, right, or rear side.
  • Page 9: Wiring Diagram

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy WIRING DIAGRAM MUZ-FD25VABH MUZ-FD35VABH www.ilmalämpöpumput.com...
  • Page 10 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50VABH www.ilmalämpöpumput.com...
  • Page 11: Refrigerant System Diagram

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy REFRIGERANT SYSTEM DIAGRAM MUZ-FD25VABH MUZ-FD35VABH 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 Discharge heat RT68 Flared connection exchanger temperature...
  • Page 12 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Piping size O.D : mm Max. Length Max. Height difference Liquid MUZ-FD25 9.52 6.35 MUZ-FD35 12.7 MUZ-FD50 Indoor unit Max. Height difference Max.
  • Page 13: Performance Curves

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE CURVES MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH 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 14 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature(°C) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 17.3 20.9 26.9 16.0 19.3 24.8 14.6 17.7 22.7 13.3 16.1 20.7...
  • Page 15 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-FD25VABH Correction of Heating input Correction of Cooling input Correction of Cooling capacity Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor...
  • Page 16: Cool Operation

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 8-4. 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 8-3.) Outdoor low pressure MUZ-FD25VABH MUZ-FD35VABH...
  • Page 17 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD25VABH CAPACITY : 2.5 kW SHF : 0.85 INPUT : 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 1.97...
  • Page 18 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD25VABH CAPACITY : 2.5 kW SHF : 0.85 INPUT : 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.64 0.67...
  • Page 19 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD35VABH CAPACITY : 3.5 kW SHF : 0.85 INPUT : 835 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.76...
  • Page 20 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD35VABH CAPACITY : 3.5 kW SHF : 0.85 INPUT : 835 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.30 0.67...
  • Page 21 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD50VABH CAPACITY : 5.0 kW SHF : 0.77 INPUT : 1510 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.47...
  • Page 22 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FD50VABH CAPACITY : 5.0 kW SHF : 0.77 INPUT : 1510 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.89 0.59...
  • Page 23 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy PERFORMANCE DATA HEAT operation at Rated frequency MUZ-FD25VABH CAPACITY : 3.2 kW INPUT : 600 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...
  • Page 24: Actuator Control

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy ACTUATOR CONTROL MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH 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.
  • Page 25: Service Functions

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50 Actuator Sensor Purpose Outdoor fan Indoor fan Defrost Compressor R.V.coil motor motor heater ○ ○ Discharge temperature Protection thermistor ○ Cooling : Coil frost prevention Indoor coil temperature ○ ○ Heating : High pressure protec- thermistor tion ○...
  • Page 26: Troubleshooting

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy TROUBLESHOOTING MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH 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 27: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 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.
  • Page 28: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi...
  • Page 29: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 3. Outdoor unit failure mode table MUZ-FD25/35 Indoor/outdoor Outdoor unit POWER lamp Abnormal point LED indication unit failure Condition Correspondence failure mode (Indoor unit) (Failure mode / protection) (Outdoor P.C. board) mode recall recall function function None (Normal)
  • Page 30: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50 LED indication Indoor/outdoor (Outdoor P.C. board) POWER lamp Abnormal point unit failure Condition Correspondence (Indoor unit) (Failure mode / protection) mode recall LED1 LED2 function None (Normal) — — — — —...
  • Page 31: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 11-3. TROUBLESHOOTING CHECK TABLE MUZ-FD25/35 Abnormal point/ Symptom LED indication Condition Correspondence Condition Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started.
  • Page 32: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50 LED indication Abnormal point/ Con- Symptom Condition Correspondence dition LED1(Red) LED2(Yellow) Outdoor unit Outdoor power system Overcurrent protection stop is continuously performed 3 times • Check the connection of the com- does not oper- within 1 minute after the compressor gets started, or when pressor connecting wire.
  • Page 33: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy LED indication Abnormal point/ Con- Symptom Condition Correspondence dition LED1(Red) LED2(Yellow) Primary current pro- The input current exceeds 15 A. These symptoms do not mean any Outdoor unit tection abnormality of the product, but operates.
  • Page 34 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FD25VABH MUZ-FD35VABH Part name Check method and criterion Figure Defrost thermistor (RT61) Ambient temperature Measure the resistance with a tester. thermistor (RT65) Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. Outdoor heat exchanger board”, the chart of thermistor.
  • Page 35 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50VABH Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature ther- Refer to 11-6. "Test point diagram and voltage", 2. "Outdoor elec- mistor (RT65) tronic control P.C.
  • Page 36 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor MUZ-FD25/35 Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C.
  • Page 37: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50 Disconnect the terminal of the compressor. 3 minutes after turn- ing on the power supply, start EMERGENCY OPERATION. • After the outdoor fan starts running, wait for 1 minute or more before meas- uring the voltage.
  • Page 38 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy B Check of open phase MUZ-FD25/35 ● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals. Output voltage is 50 - 130 V.
  • Page 39 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy D Check of compressor winding MUZ-FD25/35 ●Disconnect the connector (CN61) between the compressor and intelligent power module, 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 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor 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.
  • Page 41: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-FD50 • Heating operation does not work. Disconnect the lead wire leading to the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 230 VAC between pin1 and Turn off power supply of indoor and outdoor unit, and discon- pin 2 at connector CN912? nect the connector CN781 in the outdoor electronic control P.C.
  • Page 42 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy I Check of outdoor fan motor MUZ-FD25/35 Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? Replace the outdoor fan motor. (Refer to 11-4.) Replace the inverter P.C.
  • Page 43 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy J Check of power supply MUZ-FD25/35 Disconnect the connector (CN61) between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Replace the indoor Is there voltage 230 VAC Does POWER lamp on the indoor electronic control P.C.
  • Page 44 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy K Check of LEV (Expansion valve) 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.
  • Page 45: Outdoor Unit

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy L Check of inverter P.C. board MUZ-FD25/35 Check the outdoor fan motor. (Refer to 11-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Inverter P.C. board (Solder side) Check the connection of the connectors (CN932) of the outdoor fan motor.
  • Page 46 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 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? Turn ON the power supply. Is there rated voltage between outdoor termi- Check the wiring.
  • Page 47 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy N 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 48 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy O Check of defrost heater Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. or 2. 2. Is the resistance of defrost heater normal? Refer to 11-4. 3.
  • Page 49 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FD25VABH MUZ-FD35VABH Smoothing Smoothing Smoothing capacitor capacitor capacitor Heater Fuse (F701) DB61 Back side of unit connector (C63) (C62) (C61) 250 V 3.15 A DC 260 - 300 V (CN722) Fuse (F801)
  • Page 50: Muz-Fd50Vabh

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 2. Outdoor electronic control P.C. board MUZ-FD50VABH Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Fin temperature thermistor (RT64) Discharge temperature thermistor (RT62) 10 20 30 40 50 60 70 80 100 110 120 Temperature (°C) Temperature (°C)
  • Page 51: Muz-Fd50Vabh

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 3. Noise filter P.C. board MUZ-FD50VABH CN901 To electronic CN902 CN903 control P.C. To power To power board board board 230 VAC Input CN912 R.V. coil 230 VAC Output 230 VAC Output CN61 230 VAC Output...
  • Page 52: Muz-Fd50Vabh

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 5. Relay P.C. board MUZ-FD50VABH CN721 To electronic control P.C. board 12 VDC CN722 Connect to the heater 230 VAC output CN71 230 VAC input www.ilmalämpöpumput.com...
  • Page 53: Disassembly Instructions

    Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out.
  • Page 54 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- Screws of the nectors;...
  • Page 55 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS Outdoor heat 5. Removing outdoor fan motor Photo 6 exchanger tempera- (1) Remove the cabinet and panels. (Refer to 1.) ture thermistor (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut.
  • Page 56 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy 12-2. MUZ-FD50VABH NOTE : Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screw of the top panel (2) Remove the screws of the top panel.
  • Page 57 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, outdoor electric Photo 3 (Inverter assembly) control P.C. board, power board, noise filter P.C. Screws of the power board assembly board and reactor. (1) Remove the top panel, cabinet and service panel. (Refer to (2) Remove the back panel.
  • Page 58 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 3. Removing the defrost thermistor, discharge tempera- Photo 5 ture thermistor, outdoor heat exchanger temperature Outdoor heat Ambient tem- exchanger tempera- thermistor and ambient temperature thermistor perature ture thermistor (1) Remove the top panel, cabinet and service panel.
  • Page 59 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy OPERATING PROCEDURE PHOTOS 5. Removing the compressor and 4-way valve Photo 7 (1) Remove the top panel, cabinet and service panel. (Refer to Welded part of the Discharge temperature discharge pipe thermistor (2) Remove the back panel.
  • Page 60 Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Jul. 2008 Distributed in Jul. 2008. No. OBH519 6 Specifications subject to change without notice.