Service manual

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································4

2. PART NAMES AND FUNCTIONS······················7

3. SPECIFICATION·················································7

4. NOISE CRITERIA CURVES·······························9

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

6. WIRING DIAGRAM···········································11

7. REFRIGERANT SYSTEM DIAGRAM··············15

8. PERFORMANCE CURVES······························17

9. ACTUATOR CONTROL····································25

10. SERVICE FUNCTIONS·····································26

11. TROUBLESHOOTING······································26

12. DISASSEMBLY INSTRUCTIONS·····················45

13. PARTS LIST······················································48

14. RoHS PARTS LIST···········································52

Wireless type

Models

No. OB372

REVISED EDITION-D

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-FA25VA -

MUZ-FA35VA -

MUZ-FA25VAH -

MUZ-FA35VAH -

NOTE:

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

For servicing of RoHS compliant products, refer to the RoHS Parts List.

HFC

utilized

R410A

OUTDOOR UNIT

Please void OB372 REVISED EDITION-C

Revision D:

•PARTS LIST and RoHS PARTS LIST have been

changed.

Indoor unit service manual

MSZ-FA•VA Series (OB371)

OB372D--1qxp 07.5.7 4:36 PM Page 1

Summary of content (56 pages)

PAGE 1
OB372D--1qxp 07.5.7 4:36 PM Page 1 Revision D: •PARTS LIST and RoHS PARTS LIST have been changed. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB372 REVISED EDITION-C OUTDOOR UNIT HFC SERVICE MANUAL utilized No. OB372 REVISED EDITION-D R410A Wireless type Models MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH E1 E1 E1 E1 Indoor unit service manual MSZ-FA•VA Series (OB371) CONTENTS 1. TECHNICAL CHANGES ····································4 2.
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OB372D--1qxp 07.5.
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OB372D--1qxp 07.5.7 4:36 PM Page 3 Revision A: • The inverter P.C.board is integrated. 1.Inverter P.C.board has been changed(Refer to 11-7.1. Inverter P.C.board). FUSE F901 has been equipped. Please refer to serial number listed below regarding this change. Model MUZ-FA25VA - E1 MUZ-FA25VAH - E1 MUZ-FA35VA - E1 MUZ-FA35VAH - E1 Serial number 5002651T~ 5000401T~ 5003001T~ 5000401T~ 6. Wiring diagram Change 2.Wiring diagram has been added. (Page 12 , 14) 3.Test point diagram and voltage has been added.
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OB372D--1qxp 1 07.5.7 4:36 PM Page 4 TECHNICAL CHANGES MUZ-A09YV - E1 MUZ-A09YVH - E1 ➔ MUZ-FA25VA - E1 ➔ MUZ-FA25VAH - E1 1.Indication of capacity has been changed.(BTU base➔kW base) 2.Control method between indoor and outdoor unit has been changed. 3.Power supply method has been changed (change to supply from outdoor unit). 4. Terminal block for power supply has been added. 5.Power P.C.board has been changed. 6.Inverter P.C. board has been changed. 7.Refrigerant circuit has been changed.
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OB372D--1qxp 07.5.7 4:36 PM Page 5 Compressor New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible, refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the Raising position of the oil back hole enables to back the lower position oil back hole. refrigeration oil of the upper layer to flow back to the compressor.
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OB372D--1qxp 07.5.7 4:36 PM Page 6 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Pipe For liquid For gas mm Wall thickness 6.35 0.8 mm 9.52 0.8 mm 12.7 0.8 mm Insulation material Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient.
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OB372D--1qxp 07.5.7 4:36 PM 2 Page 7 PART NAMES AND FUNCTIONS MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH ACCESSORIES Air inlet (back and side) Piping MUZ-FA25VA MUZ-FA35VA Drain hose Air outlet 1 Drain socket 1 2 Quick clean kit 1 Drain outlet 3 SPECIFICATION MUZ-FA25VA MUZ-FA25VAH Outdoor model Cooling Function Capacity Power supply Fan motor Compressor Electrical data Capacity Rated frequency(Min.-Max.
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OB372D--1qxp 07.5.7 4:36 PM Page 8 Specifications and rating conditions of main electric parts Model Item MUZ-FA25VA MUZ-FA25VAH MUZ-FA35VA (CT) ETA19Z59BZ Current transformer (CT761, CT781) ETQ19Z71AY Smoothing capacitor (C63A, C63B, C63C) 620+ 420V Current transformer (DB61, DB65) Diode module Fuse (F61) Fuse (F71, F801,F901w) Defrost heater (H) D25XB60 250V 20A 250V 3.
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OB372D--1qxp 07.5.7 4:36 PM 4 Page 9 NOISE CRITERIA CURVES MUZ-FA25VA MUZ-FA25VAH MUZ-FA35VA MUZ-FA35VAH FAN SPEED FUNCTION SPL(dB(A)) 46 HEATING 46 FAN SPEED FUNCTION LINE High Med.
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OB372D--1qxp 07.5.7 4:36 PM 5 Page 10 OUTLINES AND DIMENSIONS MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH Unit: mm REQUIRED SPACE Drain hole [42 (MUZ-FA25/FA35VA) Drain hole [33 (MUZ-FA25/FA35VAH) m 00m or m 1 100 mm or m Bolt pitch for installation 304~325 ore 44 Air in 40 2 holes 10X21 e mm 200 or or m Open two sides of left, right, or rear side. 17.5 Service panel Air out 23 22.3 Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Handle 3569 302.
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REACTOR C N 7 2 6 C N 7 2 7 1 2 3 4 5 CN601 DB65 DB61 TR821 + NAME MF 1 2 3 4 5 1 2 3 4 5 1 2 3 TRANSFORMER FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR INTELLIGENT POWER MODULE RT64 EXPANSION VALVE COIL IPM LEV R.V. COIL X63,X64 RELAY T801 SWITCHING POWER TRANSISTOR TB1,TB2 TERMINAL BLOCK LD-W 1 2 1 2 3 4 LEV CN61 MC WHT REDW BLK V U NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. 2.
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TO INDOOR UNIT CONNECTING 12 F61 GRN WHT WHITE BLU RED F71 CT SYMBOL 4 FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR INTELLIGENT POWER MODULE RT64 EXPANSION VALVE COIL LEV X63,X64 T801 TR821 TB1,TB2 IPM,IC932 RT65 IC801 T801 F801 RT64 1 2 CN642 NAME RT61 RT62 1 2 RT65 CN641 1 2 3 4 CN643 F901 R61 INVERTER P.C. BOARD C63C + IPM W V U 1 2 3 4 5 1 2 3 4 5 CN931 IC932 N P CURRENT-DETECTING RESISTOR LDY R831 C63B C63A TR821 + + R.V.
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TO INDOOR UNIT CONNECTING 13 BLK BLK BLK BLK BLK BLK RED WHITE REACTOR AMBIENT TEMPERATURE THERMISTOR INTELLIGENT POWER MODULE RT65 EXPANSION VALVE COIL IPM LEV R61,R831 CURRENT-DETECTING RESISTOR FIN TEMPERATURE THERMISTOR INTELLIGENT POWER DEVICE RT64 BLK C N 7 2 5 TB800 LD69 LD70 1 2 3 4 5 CN601 DB65 DB61 TR821 + NAME MF 1 2 3 4 5 1 2 3 4 5 1 2 3 TRANSFORMER 21S4 HEATER PROTECTOR R.V. COIL X63,X64,X66 RELAY T801 LD-W LEV CN61 MC WHT REDW BLK V U NOTE:1.
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TO INDOOR UNIT CONNECTING 14 1 2 SYMBOL WHITE REACTOR 4 6 R61,R831 CURRENT-DETECTING RESISTOR AMBIENT TEMPERATURE THERMISTOR EXPANSION VALVE COIL IPM,IC932 INTELLIGENT POWER MODULE RT65 LEV FIN TEMPERATURE THERMISTOR INTELLIGENT POWER DEVICE RT64 1 2 3 4 5 CN601 DB65 DB61 + + IC801 T801 F801 F901 R61 NAME RT64 1 2 CN641 CN642 1 2 3 4 RT65 RT61 RT62 1 2 CN643 TRANSFORMER 21S4 HEATER PROTECTOR R.V.
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OB372D--1qxp 07.5.8 9:55 AM 7 Page 15 REFRIGERANT SYSTEM DIAGRAM MUZ-FA25VA MUZ-FA25VAH Unit:mm Refrigerant pipe [9.52 (with heat insulator) 4-way valve Muffler Stop valve (with service port) Discharge temperature thermistor RT62 Flared connection Outdoor heat exchanger Muffler Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 Flared connection Refrigerant pipe [6.35 (with heat insulator) Strainer #100 LEV Capillary tube [3.0✕[2.0✕240 R.V.
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OB372D--1qxp 07.5.7 4:36 PM Page 16 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Model MUZ-FA25VA MUZ-FA25VAH MUZ-FA35VA MUZ-FA35VAH Piping size O.D : mm Max. length Max. Height difference A B Gas Liquid 20 12 9.52 6.35 Indoor unit Max. Height difference B Max.
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OB372D--1qxp 07.5.7 4:36 PM 8 Page 17 PERFORMANCE CURVES MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions 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.
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07.5.7 4:36 PM 25.6 18.9 23.7 17.4 21.7 15.8 19.7 14.2 17.8 12.6 15.8 11.0 13.8 9.5 11.8 Page 18 Ind MSZ-FA35VA MUZ-FA35VA MUZ-FA35VAH Rated frequency 73Hz 20.
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OB372D--1qxp 07.5.7 4:36 PM Page 19 8-4. Outdoor low pressure and outdoor unit current COOL operation 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 8-3.) (kgf/F [Gauge]) (MPa [Gauge]) 14 1.4 1.2 57Hz 12 1.2 10 1.0 50 25 60 30 70 8 0.8 6 0.6 70Hz 10 1.0 8 0.8 6 0.6 4 0.4 4 0.4 2 0.2 15 2 0.
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OB372D--1qxp 07.5.7 4:36 PM Page 20 PERFORMANCE DATA COOL operation Rated frequency 57Hz MSZ-FA25VA : MUZ-FA25VA MUZ-FA25VAH CAPACITY:2.5(kW) INPUT:595(W) 21 Q SHC SHF INPUT 18 2.94 1.79 0.61 476 20 3.06 1.50 0.49 500 18 2.94 1.91 0.65 476 20 3.06 1.62 0.53 500 22 3.19 1.31 0.41 518 18 2.94 2.03 0.69 476 20 3.06 1.75 0.57 500 22 3.19 1.43 0.45 518 18 2.94 2.14 0.73 476 20 3.06 1.87 0.61 500 22 3.19 1.56 0.49 518 24 3.35 1.24 0.37 541 18 2.94 2.26 0.77 476 20 3.06 1.99 0.65 500 22 3.19 1.69 0.
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OB372D--1qxp 07.5.7 4:36 PM Page 21 PERFORMANCE DATA COOL operation Rated frequency 57Hz MSZ-FA25VA : MUZ-FA25VA MUZ-FA25VAH CAPACITY:2.5(kW) SHF:0.79 INPUT:595(W) OUTDOOR DB(:) 35 40 INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q 21 18 2.45 1.49 0.61 583 2.25 1.37 0.61 619 2.08 21 20 2.58 1.26 0.49 607 2.40 1.18 0.49 637 2.23 22 18 2.45 1.59 0.65 583 2.25 1.46 0.65 619 2.08 22 20 2.58 1.36 0.53 607 2.40 1.27 0.53 637 2.23 22 22 2.73 1.12 0.41 631 2.55 1.05 0.41 666 2.38 23 18 2.45 1.
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OB372D--1qxp 07.5.7 4:36 PM Page 22 PERFORMANCE DATA COOL operation Rated frequency 70Hz MSZ-FA35VA : MUZ-FA35VA MUZ-FA35VAH CAPACITY:3.5(kW) INPUT:935(W) 21 Q SHC SHF INPUT 18 4.11 2.39 0.58 748 20 4.29 1.97 0.46 785 18 4.11 2.55 0.62 748 20 4.29 2.14 0.50 785 22 4.46 1.70 0.38 813 18 4.11 2.71 0.66 748 20 4.29 2.32 0.54 785 22 4.46 1.87 0.42 813 18 4.11 2.88 0.70 748 20 4.29 2.49 0.58 785 22 4.46 2.05 0.46 813 24 4.69 1.59 0.34 851 18 4.11 3.04 0.74 748 20 4.29 2.66 0.62 785 22 4.46 2.23 0.
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OB372D--1qxp 07.5.7 4:36 PM Page 23 PERFORMANCE DATA COOL operation Rated frequency 70Hz MSZ-FA35VA : MUZ-FA35VA MUZ-FA35VAH CAPACITY:3.5(kW) INPUT:935(W) 35 Q SHC SHF INPUT 18 3.43 1.99 0.58 916 20 3.61 1.66 0.46 954 18 3.43 2.13 0.62 916 20 3.61 1.80 0.50 954 22 3.82 1.45 0.38 991 18 3.43 2.26 0.66 916 20 3.61 1.95 0.54 954 22 3.82 1.60 0.42 991 18 3.43 2.40 0.70 916 20 3.61 2.09 0.58 954 22 3.82 1.75 0.46 991 24 4.03 1.37 0.34 1029 18 3.43 2.54 0.74 916 20 3.61 2.24 0.62 954 22 3.82 1.91 0.
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OB372D--1qxp 07.5.7 4:36 PM Page 24 PERFORMANCE DATA HEAT operation MSZ-FA25VA : MUZ-FA25VA MUZ-FA25VAH CAPACITY:3.2(kW) INDOOR DB(:) 15 21 26 INPUT:735(W) OUTDOOR WB(:) -10 -5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 2.02 478 2.43 573 2.85 647 3.26 698 3.68 742 4.06 764 4.48 779 1.92 515 2.30 610 2.72 676 3.10 728 3.52 764 3.90 786 4.30 816 1.73 551 2.14 647 2.53 713 2.94 764 3.36 801 3.74 823 4.16 845 MSZ-FA35VA : MUZ-FA35VA MUZ-FA35VAH CAPACITY:4.
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OB372D--1qxp 07.5.7 4:36 PM 9 Page 25 ACTUATOR CONTROL MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 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 ON Compressor OFF ON Outdoor fan motor OFF 9-2. R.V. coil control Heating . . . . . Cooling . . . . . . Dry . . . . . . . . .
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OB372D--1qxp 07.5.7 4:36 PM 10 Page 26 SERVICE FUNCTIONS MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH CHANGE IN DEFROST SETTING Changing defrost finish temperature When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-7.1.
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OB372D--1qxp 07.5.8 10:01 AM Page 27 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 (11-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur. 1.
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OB372D--1qxp 07.5.7 4:36 PM Page 28 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confirm if outdoor unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25:.
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14-time flash Outdoor unit 2.5 seconds OFF (Other abnormality) 12-time flash Overcurrent 2.5 seconds OFF Compressor open-phase 11-time flash DC voltage 2.5 seconds OFF Each phase current of compressor 9-time flash Nonvolatile memory data 2.5 seconds OFF 10-time flash Discharge temperature 2.5 seconds OFF 8-time flash Outdoor fan motor 2.5 seconds OFF 7-time flash Fin temperature/ P.C. board 2.5 seconds OFF temperature 6-time flash High pressure 2.5 seconds OFF 5-time flash 2.
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OB372D--1qxp 07.5.7 4:36 PM Page 30 11-3. Instruction of troubleshooting If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates only in Test Run operation. (Refer to 8-3.) Check room temperature thermistor. Refer to "Test point diagram and voltage". Indoor unit operates. Outdoor unit doesn't operate normally.
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OB372D --2qxp 07.5.7 4:49 PM Page 31 11-4. Troubleshooting check table Inverter P.C. board (Parts side) NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation. LED Flashing No. Symptom 1 Outdoor unit does not operate LED indication Abnormal point/ Condition 1-time flash every Outdoor power 2.5 seconds system 2 Outdoor thermistors 3 Outdoor control system Condition · Check stop valve. · Reconnect connector of compressor.
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OB372D --2qxp 07.5.7 4:49 PM Page 32 11-5. Trouble criterion of main parts MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH Check method and criterion Ambient temperature thermistor (RT65) Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor. Discharge temperature thermistor (RT62) Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Fin temperature thermistor (RT64) Refer to 11-7.
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OB372D --2qxp 07.5.7 4:49 PM Page 33 11-6. Troubleshooting flow When POWER lamp flashes 5-time. Outdoor unit does not operate. A How to check inverter/ compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. Are the voltages balanced? See 11-6.B “Check of open phase” . No Check the resistance of the intelligent power module. See 11-6.C “Check of intelligent power module”. Yes Check the compressor.
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OB372D --2qxp 07.5.7 4:49 PM Page 34 D Check of compressor Refer to 11-6.E "Check of compressor winding". Is the compressor normal? No Replace the compressor. Yes Refer to 11-6.F "Check of compressor operation time". Does the compressor operate continuously? No Is the compressor operation time more than 10 seconds? Yes Ok No Replace the compressor. Yes Check the refrigerant circuit.
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OB372D --2qxp 07.5.7 4:49 PM Page 35 When POWER lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. G Check of outdoor thermistors Defrost thermistor RT61 Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board. (Check the characteristics of each thermistor.) Measure the resistance between CN641 1 and 2. Discharge temperature thermistor RT62 Measure the resistance between CN641 3 and 4.
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OB372D --2qxp 07.5.7 4:49 PM Page 36 Outdoor fan motor does not operate. I Check of outdoor fan motor Is the resistance between each terminal of outdoor fan motor normal? (Refer to 11-5.) Yes Disconnect CN932 from the inverter P.C. board. Rotate the outdoor fan slowly by hand, and measure the voltage of CN931 (Measurement of feedback output). Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) Turn ON the power supply. No Inverter P.C.
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OB372D --2qxp 07.5.7 4:49 PM Page 37 Outdoor unit does not operate at all, or stops immediately due to overcurrent. K Check of current-limiting resistor When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Is the resistance of current-limiting resistor (R64A or R64B) on the power P.C. board normal? (Normal resistance : 5' i5%) Yes Turn ON the power supply and press EMERGENCY OPERATION switch. Does LED on the inverter P.C.
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OB372D --2qxp 07.5.7 4:49 PM Page 38 Outdoor base gets frozen. M 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 11-7.1. 2) Is the resistance of defrost heater normal? Refer to 11-5.
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OB372D --2qxp 07.5.7 4:49 PM Page 39 Outdoor fan motor does not operate, or stops immediately after starting up. N Check of inverter P.C. board MUZ-FA25VA (Serial MUZ-FA25VAH (Serial MUZ-FA35VA (Serial MUZ-FA35VAH (Serial No No No No : : : : 5002651T~) 5000401T~) 5003001T~) 5000401T~) Check the outdoor fan motor. Refer to11-6.I. Is the fuse (F901) blown on the inverter P.C. board? Yes No Check the connection of the connectors. (CN931, CN932) of outdoor fan motor.
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OB372D --2qxp 07.5.7 4:49 PM Page 40 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When POWER lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. O How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. Is there rated voltage of in the power supply? No Check the power supply. Yes Turn ON the power supply.
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OB372D --2qxp 07.5.10 5:06 PM Page 41 P Electromagnetic noise enters into TV sets or radios No Is the unit earthed? Earth the unit. Yes Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
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OB372D --2qxp 07.5.10 5:33 PM Page 42 11-7. Test point diagram and voltage MUZ-FA25VA (Serial No : ~5002650T) MUZ-FA25VAH (Serial No : ~5000400T) MUZ-FA35VA (Serial No : ~5003000T) MUZ-FA35VAH (Serial No : ~5000400T) 1. Inverter P.C. board Back side of unit DB61 280V ~ 370V DC (-) (+) 1(+) 2(+) 3(+) 45V Rotational frequency feedback signal of outdoor fan motor (CN931) Output to drive Smoothing capacitor FUSE(F801) Smoothing capacitor Smoothing capacitor compressor (C63A) 250V 3.
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OB372D --2qxp 07.5.10 5:06 PM Page 43 11-7. Test point diagram and voltage MUZ-FA25VA (Serial No : 5002651T~) MUZ-FA25VAH (Serial No : 5000401T~) MUZ-FA35VA (Serial No : 5003001T~) MUZ-FA35VAH (Serial No : 5000401T~) 1. Inverter P.C. board Back side of unit DB61 280V ~ 370V DC (-) (+) Smoothing capacitor (C63C) 230V AC DB61 Smoothing capacitor (C63B) Smoothing capacitor (C63A) FUSE(F801) 250V 3.15A FUSE(F901) 250V 3.
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OB372D --2qxp 07.5.7 4:49 PM Page 44 MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 2. Power P.C. board Back side of unit Varistor (NR63) Varistor (NR62) Varistor (NR64) Front side of unit 230V AC R.V. coil (CN721) 230V AC Connecting wire with inverter P.C.board (CN726) Refer to 11-6.M FUSE(F71) 250V 3.15A 230V AC Heater connector (CN722) Refer to 11-6.
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OB372D --2qxp 07.5.7 4:49 PM 12 Page 45 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. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not.
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OB372D --2qxp 07.5.8 10:03 AM Page 46 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power P.C. board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the ground wires(See Photo 3.), the lead wire to the reactor and the following connectors;
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OB372D --2qxp 07.5.7 4:50 PM Page 47 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut. (5) Remove the propeller. (See Photo 7.) (6) Remove the screws fixing the fan motor. (See Photo 7.) (7) Remove the fan motor. Photo 6 6.
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OB372D --2qxp 07.5.7 4:50 PM 13 Page 48 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-1.
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OB372D --2qxp 07.5.7 4:50 PM Page 49 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. No. Part No.
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OB372D --2qxp 07.5.7 4:50 PM Page 50 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-2. OUTDOOR UNIT ELECTRICAL PARTS 9 10 8 7 6 2 1 5 4 3 Part numbers that are circled are not shown in the illustration. No. Part No.
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OB372D --2qxp 07.5.7 4:50 PM Page 51 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA 13-3. DRAIN SOCKET 1 No. Parts No. Parts Name Q'ty/unit Symbol in Wiring MUZ-FA25VA- E1 MUZ-FA35VADiagram 1 E02 838 704 DRAIN SOCKET 1 E1 Remarks 1 MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-4. QUICK CLEAN KIT ●You can clean the surface of the heat exchanger and line flow fan if you attach QUICK CLEAN KIT to your vacuum cleaner. 2 No. Parts No.
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OB372D --2qxp 07.5.7 4:50 PM 14 Page 52 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-1.
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OB372D --2qxp 07.5.7 4:50 PM Page 53 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS No. RoHS Part number that is circled is not shown in the illustration. 1 G 2 G 3 G G 4 G G 5 G 6 G 7 G 8 G 9 G 10 G G 11 G 12 G 13 G G 14 G G 15 G G 16 G G 17 G G 18 G G G G 19 G 20 G G 21 G 22 G 23 G 24 G G 25 G Part No.
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OB372D --2qxp 07.5.7 4:50 PM Page 54 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-2. OUTDOOR UNIT ELECTRICAL PARTS 9 10 8 7 6 2 1 5 4 3 No. RoHS Part numbers that are circled are not shown in the illustration. 1 G G 2 G 3 G 4 G 5 G 6 G 7 G 8 G 9 G G G 10 G G 11 G 12 G 13 G Part No.
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OB372D --2qxp 07.5.7 4:50 PM Page 55 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA 14-3. DRAIN SOCKET No. RoHS 1 Parts No. Parts Name Q'ty/unit Symbol in Wiring MUZ-FA25VA- E1 MUZ-FA35VADiagram 1 G E12 838 704 DRAIN SOCKET 1 E1 Remarks 1 MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-4. QUICK CLEAN KIT ●You can clean the surface of the heat exchanger and line flow fan if you attach QUICK CLEAN KIT to your vacuum cleaner. No. RoHS 2 Parts No.
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OB372D --2qxp 07.5.7 4:50 PM Page 56 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2007. No. OB372 REVISED EDITION-D 6 Distributed in Feb. 2007. No. OB372 REVISED EDITION-C 6 Distributed in May 2006. No. OB372 REVISED EDITION-B 6 Distributed in Jan. 2006. No. OB372 REVISED EDITION-A 6 Distributed in Jan. 2005. No.