Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MUZ-FA25VA -
MUZ-FA35VA -
MUZ-FA25VAH -
MUZ-FA35VAH -
NOTE:
This service manual describes technical data of the outdoor units.
•As for indoor units MSZ-FA25VA-
E1
E1
E1
E1
Indication of
model name
MUZ-FA25VA -
E1
MUZ-FA35VA -
E1
MUZ-FA25VAH -
E1
MUZ-FA35VAH -
E1
and MSZ-FA35VA-
, refer to the service manual OB371.
E1
E1
HFC
utilized
R410A
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
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····································21
10. SERVICE FUNCTIONS·····································22
11. TROUBLESHOOTING ······································22
12. DISASSEMBLY INSTRUCTIONS·····················39
13. PARTS LIST······················································42
No. OB372
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-FA25VA
Summary of Contents for Mitsubishi Electric MUZ-FA25VA
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB372 utilized SERVICE MANUAL R410A Wireless type Models MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························7 Indication of 5. -
Page 2: 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 3 New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible each, 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 4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall Pipe Insulation material thickness For liquid 6.35 0.8 mm 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 5: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - OUTDOOR UNIT ACCESSORIES Air inlet (back and side) Piping MUZ-FA25VAH - MUZ-FA25VA - Drain hose MUZ-FA35VAH - MUZ-FA35VA - Drain socket Air outlet Quick clean kit Drain outlet... - Page 6 Specifications and rating conditions of main electric parts OUTDOOR UNIT 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...
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Page 7: 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:) -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FA25VA - MUZ-FA35VA - Unit: mm MUZ-FA25VAH - MUZ-FA35VAH - OUTDOOR UNIT 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) -
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-FA25VA - MODELS WIRING DIAGRAM MUZ-FA35VA - OUTDOOR UNIT... - Page 10 MUZ-FA25VAH - MODELS WIRING DIAGRAM MUZ-FA35VAH - OUTDOOR UNIT...
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Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-FA25VA - Unit:mm MUZ-FA25VAH - OUTDOOR UNIT Refrigerant pipe [9.52 4-way valve (with heat insulator) Muffler Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperatuer thermistor RT62 Ambient Compressor temperature thermistor Defrost RT65... - Page 12 Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MUZ-FA25VA - Gas 0.43 MUZ-FA25VAH - 9.52 6.35 MUZ-FA35VA - Liquid 0.5 MUZ-FA35VAH - MAX. HEIGHT DIFFERENCE...
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Page 13: 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 provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 14 11.0 13.8 11.8 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. MUZ-FA25VA - MUZ-FA25VA - MUZ-FA25VA - MUZ-FA25VA - MUZ-FA25VAH - MUZ-FA25VAH - MUZ-FA25VAH -...
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Page 15: Heat Operation
COOL operation Relative humidity(%) Dry-bulb temperature 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 57Hz(MUZ-FA25VA, MUZ-FA25VAH) 70Hz(MUZ-FA35VA, MUZ-FA35VAH) MUZ-FA35VA - MUZ-FA25VA - MUZ-FA35VAH - MUZ-FA25VAH -... - Page 16 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...
- Page 17 PERFORMANCE DATA COOL operation Rated frequency 57Hz MSZ-FA25VA - : MUZ-FA25VA - MUZ-FA25VAH - CAPACITY:2.5(kW) SHF:0.79 INPUT:595(W) DB( : ) OUTDOOR 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...
- Page 18 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 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...
- Page 19 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 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...
- Page 20 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...
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Page 21: 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. -
Page 22: Service Functions
SERVICE FUNCTIONS MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - CHANGE IN DEFROST SETTING <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... - Page 23 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 24 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure There is a possibility that the outdoor unit is abnormal. Confirm the presence of abnormality according to the following procedures. Confirm that the remote controller is in the failure mode recall function.
- Page 25 3. Outdoor unit failure mode table...
- Page 26 11-3. Instruction of troubleshooting w As for "Test run opearation", If blinking of OPERATION INDICATOR lamp cannot refer to indoor unit service be checked, it can be manual OB371. Start checked with failure mode recall function. OPERATION OPERATION Indoor unit Indoor unit INDICATOR INDICATOR...
- Page 27 · Refer to 11-6.A "How to check inverter/compressor". 1-time flash Frequency drop by When current from power outlet exceeds 6.1A(MUZ-FA25VA, The unit is normal, but check the Outdoor unit current protection following. 2.5 seconds OFF MUZ-FA25VAH)/ 9.2A(MUZ-FA35VA, MUZ-FA35VAH),...
- Page 28 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. (Part temperature –10˚C ~ 40˚C) (RT61) Abnormal Normal Open or short-circuit 5 k"...
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Page 29: Troubleshooting Flow
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 30 Check of compressor Start 11-6.E "Check of Replace the compressor. compressor winding". Is the compressor normal? 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. Check of compressor winding Disconnect the connector (CN61) between the compressor and RED BLK...
- Page 31 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 1 Reconnect the resistance connectors CN641,...
- Page 32 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 Turn ON the between each terminal of from the inverter of feedback output).
- Page 33 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. Turn ON the power Does the current-limiting resistor supply and press Replace the power P.C.
- Page 34 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 35 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. Is there rated voltage of Check the power 230V AC in the power supply.
- Page 36 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, or the antennas and the distance between the outdoor unit.
- Page 37 11-7. Test point diagram and voltage MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - 1. Inverter P.C. board Output to drive Smoothing capacitor Smoothing capacitor Smoothing capacitor Back side of unit compressor (C63A) (C63B) (C63C) (LDV,LDW,LDU) DB61 1(+) 280V ~ 370V...
- Page 38 MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - 2. Power P.C. board Front side of unit Back side of unit Varistor Varistor Varistor (NR63) (NR62) (NR64) 230V AC R.V. coil (CN721) 230V AC Connecting wire with 230V AC inverter P.C.board...
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Page 39: Disassembly Instructions
1Slide the sleeve. 1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the cabinet. - Page 40 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 41 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 42: Parts List
PARTS LIST MUZ-FA25VA - MUZ-FA35VA - MUZ-FA25VAH - MUZ-FA35VAH - 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9... - Page 43 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- Remarks Part No. Part Name...
- Page 44 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 Part No. Part Name Remarks FA25VA- FA25VAH- FA35VA-...
- Page 45 MUZ-FA25VA - MUZ-FA35VA - 13-3. DRAIN SOCKET Outdoor unit {42 drain hole Soft vinyl chloride hose of 25mm inside diameter. 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 -...
- Page 48 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2005. No. OB372 6 New publication, effective Jan. 2005 Made in Japan Specifications subject to change without notice.