Mitsubishi Electric MUZ-GA25VA Service Manual

Split-type, heat pump air conditioners

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Service manual (64 pages)

Summary of Contents for Mitsubishi Electric MUZ-GA25VA

Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB379 utilized SERVICE MANUAL R410A Wireless type Models MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················6 3. SPECIFICATION·················································7 4. NOISE CRITERIA CURVES ·······························9 Indication of 5.
Page 2: Technical Changes
TECHNICAL CHANGES MUZ-A09YV - MUZ-GA25VA - MUZ-A09YVH - MUZ-GA25VAH - 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).
Page 3 INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air conditioners.
Page 4 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) R410A NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system). The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f f [Gauge]) -0.5 -30 -20 -10 1.Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant.
Page 5 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter R410A 6.35 9.52 12.7 3.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
Page 6: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - OUTDOOR UNIT Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-GA25VA - MUZ-GA25VAH - MUZ-GA35VA - MUZ-GA35VAH - Drain socket – Quick clean kit...
Page 7: Specification
SPECIFICATION MUZ-GA25VA - MUZ-GA35VA - Outdoor model MUZ-GA25VAH - MUZ-GA35VAH - Cooling Function Heating Cooling Heating Single phase Single phase Power supply 230V,50Hz 230V,50Hz 3.5 (1.0-3.9) 4.0 (0.9-5.0) 2.5 (0.9-3.0) Capacity Rated frequency(Min.-Max.) 3.2 (0.9-4.5) — — Dehumidification 2,178 1,890...
Page 8 Specifications and rating conditions of main electric parts OUTDOOR UNIT Model MUZ-GA25VA - MUZ-GA25VAH - MUZ-GA35VA - MUZ-GA35VAH - Item (CT) Current transformer ETA19Z59BZ (CT761, CT781) Current transformer ETQ19Z71AY (C63A, C63B, C63C) Smoothing capacitor 620+ 420V (DB61, DB65) Diode module...
Page 9: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING High 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:)
Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-GA25VA - MUZ-GA35VA - Unit: mm MUZ-GA25VAH - MUZ-GA35VAH - 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-GA25/GA35VA) Drain hole [33 (MUZ-GA25/GA35VAH)
Page 11: Wiring Diagram
WIRING DIAGRAM MUZ-GA25VA - MODEL WIRING DIAGRAM OUTDOOR UNIT...
Page 12 MUZ-GA25VAH - MODEL WIRING DIAGRAM OUTDOOR UNIT...
Page 13 MUZ-GA35VA - MODEL WIRING DIAGRAM OUTDOOR UNIT...
Page 14 MUZ-GA35VAH - MODEL WIRING DIAGRAM OUTDOOR UNIT...
Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-GA25VA - Unit:mm MUZ-GA25VAH - OUTDOOR UNIT 4-way valve Refrigerant pipe [9.52 (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 16 Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MUZ-GA25VA - Gas 0.43 MUZ-GA25VAH - 9.52 6.35 MUZ-GA35VA - Liquid 0.5 MUZ-GA35VAH - MAX. HEIGHT DIFFERENCE...
Page 17: Performance Curves
PERFORMANCE CURVES MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 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 18 10.6 13.3 11.4 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-GA25VA - MUZ-GA25VA - MUZ-GA25VA - MUZ-GA25VA - MUZ-GA25VAH - MUZ-GA25VAH - MUZ-GA25VAH -...
Page 19 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 : 65Hz(MUZ-GA25VA, MUZ-GA25VAH) 88Hz(MUZ-GA35VA, MUZ-GA35VAH) MUZ-GA35VA - MUZ-GA25VA - MUZ-GA35VAH - MUZ-GA25VAH -...
Page 20 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA25VA - : MUZ-GA25VA - MUZ-GA25VAH - CAPACITY:2.5(kW) SHF:0.79 INPUT:640(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 21 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA25VA - : MUZ-GA25VA - MUZ-GA25VAH - CAPACITY:2.5(kW) SHF:0.79 INPUT:640(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...
Page 22 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - : MUZ-GA35VA - MUZ-GA35VAH - CAPACITY:3.5(kW) SHF:0.76 INPUT:1080(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 23 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - : MUZ-GA35VA - MUZ-GA35VAH - CAPACITY:3.5(kW) SHF:0.76 INPUT:1080(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.99 0.58 1058 3.15 1.83 0.58 1123 2.91 1.68 0.58...
Page 24 PERFORMANCE DATA HEAT operation MSZ-GA25VA - : MUZ-GA25VA - MUZ-GA25VAH - Rated frequency 85Hz CAPACITY:3.2(kW) INPUT:760(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...
Page 25: Actuator Control
ACTUATOR CONTROL MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 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 26: Service Functions
SERVICE FUNCTIONS MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 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 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 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 29 3. Outdoor unit failure mode table...
Page 30 11-3. Instruction of troubleshooting Start Indoor unit Indoor unit OPERATION INDICATOR Indoor unit operates. operates. doesn't receive lamp on the indoor unit is Outdoor unit doesn't Outdoor unit the signal from flashing on and off. operate normally. doesn't remote controller. operate.
Page 31 · Refer to 11-6.A "How to check inverter/compresssor". 1-time flash Frequency drop by When current from power outlet exceeds 5.2A(MUZ-GA25VA, The unit is normal, but check the Outdoor unit current protection following. 2.5 seconds OFF MUZ-GA25VAH)/ 6.1A(MUZ-GA35VA, MUZ-GA35VAH),...
Page 32 11-5. Trouble criterion of main parts MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (Part temperature –10˚C ~ 40˚C) (RT61) Normal Abnormal Open or short-circuit 5 k"...
Page 33 11-6. Troubleshooting flow When OPERATION INDICATOR 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 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 35 When OPERATION INDICATOR 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 36 Outdoor fan motor does not operate. Check of outdoor fan motor MUZ-GA25VA MUZ-GA25VAH Check the resistance of fan motor. (Refer to 11-5.) Replace the outdoor Is the resistance of fan fan motor. motor normal? Disconnect the connector CN771 on the power P.C.
Page 37 Outdoor fan motor does not operate. Check of outdoor fan motor MUZ-GA35VA MUZ-GA35VAH 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 38 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 39 Outdoor base gets frozen. Check of defrost heater <MUZ-GA25VAH MUZ-GA35VAH> 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 40 When OPERATION INDICATOR 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 41 When the cool air does not blow out from the indoor unit in Low Outside Temperature Operation, or the condensed water drops from the indoor unit. Operation check of the solenoid valve. Enter the failure mode recall function. Do you hear the operation sound (click sound) of the solenoid valve The solenoid valve is normal.
Page 42 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 43 11-7. Test point diagram and voltage. MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 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 44 MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 2. Power P.C. board MUZ-GA25VA MUZ-GA25VAH Solenoid valve coil Front side of unit Back side of unit Varistor Varistor Varistor (CN923) (NR63) (NR62) (NR64) 230V AC 230V AC MUZ-GA25VA MUZ-GA25VAH Output to drive outdoor...
Page 45: 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-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet. Photo 1 (1) Remove the screw fixing the service panel.
Page 46 <Power P.C. board> CN721 (4-way valve) CN771 (Fan motor) MUZ-GA25VA/GA25VAH- CN722 (Defrost heater) MUZ-GA25/GA35VAH- CN923 (Solenoid valve coil) MUZ-GA25VA/GA25VAH- <Inverter P.C. board> CN931,CN932 (Fan motor) MUZ-GA35VA/GA35VAH- CN641 (Defrost thermistor and discharge temperature thermistor)
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.
Page 48: Parts List
PARTS LIST MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9...
Page 49 MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit in Wiring MUZ- MUZ- MUZ- MUZ- Part No. Part Name Remarks...
Page 50 MUZ-GA25VA - MUZ-GA35VA - MUZ-GA25VAH - MUZ-GA35VAH - 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 GA25VA- GA25VAH- GA35VA-...
Page 51 MUZ-GA25VA - MUZ-GA35VA - 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-GA25VA- MUZ-GA35VA- Diagram E02 838 704 DRAIN SOCKET MUZ-GA25VA - MUZ-GA35VA -...
Page 52 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Jan. 2005 Distributed in Jan. 2005. No. OB379 6 Specifications subject to change without notice. Made in Japan...

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