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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Wireless type
Models
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.
Revision D:
•PARTS LIST and RoHS PARTS LIST have been
changed.
Please void OB372 REVISED EDITION-C
HFC
utilized
R410A
E1
E1
E1
E1
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
No. OB372
REVISED EDITION-D
Indoor unit service manual
MSZ-FA•VA Series (OB371)
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-FA25VA-E1
Summary of Contents for Mitsubishi Electric MUZ-FA25VA-E1
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Page 1: Table Of Contents
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 No. OB372 SERVICE MANUAL REVISED EDITION-D utilized R410A Wireless type Models MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - Indoor unit service manual MSZ-FA•VA Series (OB371) - 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 Serial number 6. Wiring diagram 11-6.N Check of inverter P.C.board MUZ-FA25VA - 5002651T~ MUZ-FA25VAH -...
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Page 4: Technical Changes
TECHNICAL CHANGES MUZ-A09YV - MUZ-FA25VA - MUZ-A09YVH - MUZ-FA25VAH - 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. - Page 5 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.
- Page 6 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall Pipe Insulation material thickness For liquid 0.8 mm 6.35 Heat resisting foam plastic 0.8 mm 9.52 For gas Specific gravity 0.045 Thickness 8 mm 0.8 mm 12.7 •...
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Page 7: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH ACCESSORIES Air inlet (back and side) Piping MUZ-FA25VA MUZ-FA25VAH Drain hose MUZ-FA35VA MUZ-FA35VAH Drain socket Air outlet Quick clean kit Drain outlet SPECIFICATION MUZ-FA25VA MUZ-FA35VA Outdoor model MUZ-FA25VAH MUZ-FA35VAH Cooling Function Heating Cooling Heating Single phase... - Page 8 Specifications and rating conditions of main electric parts Model MUZ-FA25VA MUZ-FA25VAH MUZ-FA35VA MUZ-FA35VAH Item (CT) Current transformer ETA19Z59BZ (CT761, CT781) Current transformer ETQ19Z71AY (C63A, C63B, C63C) Smoothing capacitor 620+ 420V (DB61, DB65) Diode module D25XB60 (F61) Fuse 250V 20A (F71, F801,F901w) Fuse 250V 3.15A Defrost heater...
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Page 9: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING High High Med. Med. HEATING HEATING Test conditions Test conditions Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Heating : Dry-bulb temperature 7: Wet-bulb temperature Heating : Dry-bulb temperature 7: Wet-bulb temperature NC-70... -
Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FA25VA MUZ-FA35VA Unit: mm MUZ-FA25VAH MUZ-FA35VAH REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. Drain hole [42 (MUZ-FA25/FA35VA) Drain hole [33 (MUZ-FA25/FA35VAH) Air in Air in Open two sides of left, right, or rear side. -
Page 11: Wiring Diagram
WIRING DIAGRAM MUZ-FA25VA (Serial No : ~5002650T) MUZ-FA35VA (Serial No : ~5003000T) - Page 12 MUZ-FA25VA (Serial No : 5002651T~) MUZ-FA35VA (Serial No : 5003001T~)
- Page 13 MUZ-FA25VAH (Serial No : ~5000400T) MUZ-FA35VAH (Serial No : ~5000400T)
- Page 14 MUZ-FA25VAH (Serial No : 5000401T~) MUZ-FA35VAH (Serial No : 5000401T~)
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Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-FA25VA Unit:mm MUZ-FA25VAH Refrigerant pipe [9.52 4-way valve (with heat insulator) Muffler Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor Defrost RT65 thermistor RT61 Strainer #100 Flared connection Capillary tube R.V. - Page 16 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Piping size O.D : mm Model Max. length Max. Height difference Liquid MUZ-FA25VA MUZ-FA25VAH 9.52 6.35 MUZ-FA35VA MUZ-FA35VAH Indoor unit Max. Height difference Max. length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A:g) Refrigerant piping length (one way) Outdoor unit Model...
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Page 17: Performance Curves
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 pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 18 20.5 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 11.8 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above broken lines are for the heating operation without any frost and defrost operation.
- Page 19 8-4. Outdoor low pressure and outdoor unit current COOL operation Relative humidity(%) Dry-bulb temperature(:) 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 8-3.) MUZ-FA35VA MUZ-FA25VA MUZ-FA35VAH MUZ-FA25VAH (kgf/F [Gauge]) (MPa [Gauge]) (kgf/F [Gauge]) (MPa [Gauge]) 70Hz 57Hz...
- Page 20 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( : ) INDOOR INDOOR WB(:) DB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.79 0.61 2.81 1.72 0.61 2.70 1.65 0.61 2.60 1.59 0.61 3.06 1.50 0.49...
- 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( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.49 0.61 2.25 1.37 0.61 2.08 1.27 0.61 2.58 1.26 0.49 2.40 1.18 0.49 2.23 1.09 0.49...
- Page 22 PERFORMANCE DATA COOL operation Rated frequency 70Hz MSZ-FA35VA : MUZ-FA35VA MUZ-FA35VAH CAPACITY:3.5(kW) SHF:0.76 INPUT:935(W) DB( : ) OUTDOOR INDOOR INDOOR WB(:) DB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 2.39 0.58 3.94 2.28 0.58 3.78 2.19 0.58 3.64 2.11 0.58 4.29 1.97 0.46...
- Page 23 PERFORMANCE DATA COOL operation Rated frequency 70Hz MSZ-FA35VA : MUZ-FA35VA MUZ-FA35VAH CAPACITY:3.5(kW) SHF:0.76 INPUT:935(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.99 0.58 3.15 1.83 0.58 2.91 1.68 0.58 1010 3.61 1.66 0.46 3.36 1.55 0.46...
- Page 24 PERFORMANCE DATA HEAT operation MSZ-FA25VA : MUZ-FA25VA MUZ-FA25VAH Rated frequency 77Hz CAPACITY:3.2(kW) INPUT:735(W) WB( : ) OUTDOOR INDOOR DB( : ) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.92 2.30 2.72 3.10 3.52 3.90 4.30 1.73...
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Page 25: Actuator Control
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 Compressor... -
Page 26: Service Functions
SERVICE FUNCTIONS MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> 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.) Defrost finish temperature MUZ-FA25VA MUZ-FA25VAH MUZ-FA35VA... - 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.
- 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.
- Page 29 3. Outdoor unit failure mode table NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
- Page 30 11-3. Instruction of troubleshooting If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked Start with failure mode recall function. OPERATION Indoor unit Indoor unit INDICATOR Indoor unit operates. operates. doesn't receive lamp on the indoor Outdoor unit doesn't Outdoor unit the signal from unit is flashing on...
- 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. Flashing Symptom LED indication Abnormal point/ Condition Condition Correspondence When it consecutively occurs 3 times that the compressor stops ·...
- Page 32 11-5. Trouble criterion of main parts MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (RT61) Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board", Ambient temperature the chart of thermistor.
- Page 33 11-6. Troubleshooting flow When POWER lamp flashes 5-time. Outdoor unit does not operate. How to check inverter/ compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage See 11-6.B “Check of open phase” . between terminals.
- Page 34 Check of compressor Refer to 11-6.E "Check of Replace the compressor. compressor winding". Is the compressor normal? Refer to 11-6.F "Check of Is the compressor compressor operation time". operation time more than Replace the compressor. Does the compressor 10 seconds? operate continuously? Check the refrigerant circuit.
- Page 35 When POWER lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. Check of outdoor thermistors Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board. Defrost thermistor RT61 (Check the characteristics of each thermistor.) Measure the resistance between CN641 1 and 2.
- Page 36 Outdoor fan motor does not operate. Check of outdoor fan motor Rotate the outdoor fan slowly by hand, and measure the Is the resistance Disconnect CN932 voltage of CN931 (Measurement between each terminal of Turn ON the from the inverter of feedback output).
- Page 37 Outdoor unit does not operate at all, or stops immediately due to overcurrent. 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 Turn ON the power Replace the power P.C.
- Page 38 Outdoor base gets frozen. Check of defrost heater <MUZ-FA25VAH MUZ-FA35VAH> 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. 3) Does the heater protector remain conducted (not open)? 4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors? In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5: or less, and let the...
- Page 39 Outdoor fan motor does not operate, or stops immediately after starting up. Check of inverter P.C. board MUZ-FA25VA (Serial No : 5002651T~) MUZ-FA25VAH (Serial No : 5000401T~) MUZ-FA35VA (Serial No : 5003001T~) MUZ-FA35VAH (Serial No : 5000401T~) Check the outdoor fan motor. Refer to11-6.I.
- 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. How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
- Page 41 Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3m, or is the unit, and/or the antennas and distance between the the outdoor unit.
- Page 42 11-7. Test point diagram and voltage MUZ-FA25VA (Serial No : ~5002650T) MUZ-FA35VA (Serial No : ~5003000T) MUZ-FA25VAH (Serial No : ~5000400T) MUZ-FA35VAH (Serial No : ~5000400T) 1. Inverter P.C. board Output to drive Smoothing capacitor Smoothing capacitor FUSE(F801) Smoothing capacitor Back side of unit compressor 250V 3.15A...
- Page 43 11-7. Test point diagram and voltage MUZ-FA25VA (Serial No : 5002651T~) MUZ-FA35VA (Serial No : 5003001T~) MUZ-FA25VAH (Serial No : 5000401T~) MUZ-FA35VAH (Serial No : 5000401T~) 1. Inverter P.C. board Back side of unit 230V AC Smoothing capacitor Smoothing capacitor Smoothing capacitor DB61 DB61...
- Page 44 MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 2. Power P.C. board Back side of unit Front side of unit Varistor Varistor Varistor (NR63) (NR62) (NR64) 230V AC R.V. coil (CN721) 230V AC FUSE(F71) Connecting wire with 230V AC 250V 3.15A inverter P.C.board Heater connector (CN726) (CN722) Refer to 11-6.M...
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Page 45: 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 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. - Page 46 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and power P.C. board (1) Remove the top panel, cabinet and service panel. Screws of the (Refer to 1.) relay panel (2) Disconnect the power supply and indoor/outdoor Screws of connecting wire and remove the back panel.
- Page 47 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (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.
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Page 48: Parts List
PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9... - 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. Symbol Q'ty/unit in Wiring MUZ- MUZ- MUZ- MUZ- Part No. Part Name Remarks FA25VA- FA25VAH- FA35VA-...
- Page 50 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 13-2. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MUZ- MUZ- MUZ- MUZ- in Wiring Remarks Part No. Part Name FA25VA- FA25VAH- FA35VA- FA35VAH- Diagram E02 838 337...
- Page 51 PARTS LIST (non-RoHS compliant) MUZ-FA25VA MUZ-FA35VA 13-3. DRAIN SOCKET Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MUZ-FA25VA- MUZ-FA35VA- Diagram E02 838 704 DRAIN SOCKET 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.
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Page 52: Rohs Parts List
RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9... - Page 53 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring MUZ- MUZ- MUZ- MUZ- Part No. Part Name Remarks FA25VA- FA25VAH-...
- Page 54 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA MUZ-FA25VAH MUZ-FA35VAH 14-2. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring MUZ- MUZ- MUZ- MUZ- Remarks Part No. Part Name FA25VA- FA25VAH- FA35VA- FA35VAH- Diagram...
- Page 55 RoHS PARTS LIST (RoHS compliant) MUZ-FA25VA MUZ-FA35VA 14-3. DRAIN SOCKET Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks MUZ-FA25VA- MUZ-FA35VA- Diagram E12 838 704 DRAIN SOCKET 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.
- Page 56 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C 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.