Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MUZ-GC25VA -
MUZ-GC25VAH -
MUZ-GC35VA -
MUZ-GC35VAH -
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
E1
E1
MUZ-GC25VA
MUZ-GC25VAH
HFC
utilized
R410A
E1
E1
Indoor unit service manual
MSZ-GC•VA Series (OBH468)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································3
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ······························13
9. ACTUATOR CONTROL····································22
10. SERVICE FUNCTIONS·····································23
11. TROUBLESHOOTING ······································23
12. DISASSEMBLY INSTRUCTIONS·····················42
PARTS CATALOG (OBB469)
No. OBH469
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-GC25VA-E1
Summary of Contents for Mitsubishi Electric MUZ-GC25VA-E1
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT No. OBH469 SERVICE MANUAL utilized R410A Wireless type Models MUZ-GC25VA - MUZ-GC25VAH - MUZ-GC35VA - MUZ-GC35VAH - Indoor unit service manual MSZ-GC•VA Series (OBH468) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. -
Page 2: Technical Changes
TECHNICAL CHANGES MUZ-GA25VA - MUZ-GC25VA - MUZ-GA25VAH - MUZ-GC25VAH - MUZ-GA35VA - MUZ-GC35VA - MUZ-GA35VAH - MUZ-GC35VAH - 1.Outdoor model has been changed. PART NAMES AND FUNCTIONS MUZ-GC35VA MUZ-GC25VA MUZ-GC35VAH MUZ-GC25VAH Air inlet Air inlet Piping Piping Drain hose Drain hose Air outlet Air outlet Drain outlet... -
Page 3: Specification
SPECIFICATION MUZ-GC25VA MUZ-GC35VA Outdoor model MUZ-GC25VAH MUZ-GC35VAH Cooling Function Heating Cooling Heating Single phase Power supply 230V,50Hz 4.0 (0.9-5.0) 2.5 (0.9-3.0) 3.5 (1.0-3.9) 3.2 (0.9-4.5) Capacity Rated frequency(Min.-Max.) — — Dehumidification 1,812 2,010 2,082 K /h Air flow 1 1,788 Power outlet Running current 1(Total) 1,055... - Page 4 Specifications and rating conditions of main electric parts Model MUZ-GC25VA MUZ-GC25VAH MUZ-GC35VA MUZ-GC35VAH Item (CT) Current — (CT761, CT781) transformer 500+ 420V Smoothing (C61,C62) — — (C63A, C63B, C63C) capacitor 620+ 420V 15A 600V Diode module (DB61) — 10A 600V (DB65) —...
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Page 5: Outdoor Unit
NOISE CRITERIA CURVES MUZ-GC25VA MUZ-GC35VA MUZ-GC35VAH MUZ-GC25VAH 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 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-GC25VA Unit: mm REQUIRED SPACE MUZ-GC25VAH Basically open 100 mm or more without any obstruction in front and on both sides of the unit. 381.5 Air in Air in Open two sides of left, right, or rear side. 2 holes 10 X 16 Air out Service panel... -
Page 7: Wiring Diagram
WIRING DIAGRAM MUZ-GC25VA... - Page 8 MUZ-GC25VAH...
- Page 9 MUZ-GC35VA...
- Page 10 MUZ-GC35VAH...
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Page 11: Cooling
REFRIGERANT SYSTEM DIAGRAM MUZ-GC25VA Unit:mm MUZ-GC25VAH 4-way valve Refrigerant pipe [9.52 (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 Expansion valve... -
Page 12: Outdoor Unit
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Piping size O.D : mm Model Max. length Max. Height difference Liquid MUZ-GC25VA MUZ-GC25VAH 6.35 9.52 MUZ-GC35VA MUZ-GC35VAH Indoor unit Max. Height difference Max. length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A:g) Refrigerant piping length (one way) Outdoor unit Model... -
Page 13: Heating
PERFORMANCE CURVES MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH 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 14: Heating
Total input (cooling) 10.6 Outdoor intake air Dry-bulb temperature (:) Heating capacity 20.9 27.5 19.3 25.4 17.7 23.3 16.1 21.2 14.5 19.1 12.9 16.9 11.3 14.8 12.7 10.6 Outdoor intake air Wet-bulb temperature (:) Total input(heating) 20.9 27.5 19.3 25.4 17.7 23.3 16.1... - Page 15 8-2. Capacity and input correction by operational frequency of compressor MUZ-GC25VA MUZ-GC25VAH Correction of Heating total input Correction of Cooling capacity Correction of Cooling total input 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 MUZ-GC35VA...
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Page 16: Outdoor Unit
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.) Outdoor low pressure MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH NOTE :... - Page 17 PERFORMANCE DATA COOL operation at Rated frequency MUZ-GC25VA MUZ-GC25VAH CAPACITY:2.5(kW) SHF:0.79 INPUT:665(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 2.94 1.44 0.49...
- Page 18 PERFORMANCE DATA COOL operation at Rated frequency MUZ-GC25VA MUZ-GC25VAH CAPACITY:2.5(kW) SHF:0.79 INPUT:665(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 19 PERFORMANCE DATA COOL operation at Rated frequency MUZ-GC35VA MUZ-GC35VAH CAPACITY:3.5(kW) SHF:0.76 INPUT:1075(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 4.29 1.97 0.46 4.11 1.89 0.46...
- Page 20 PERFORMANCE DATA COOL operation at Rated frequency MUZ-GC35VA MUZ-GC35VAH CAPACITY:3.5(kW) SHF:0.76 INPUT:1075(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.99 0.58 1054 3.15 1.83 0.58 1118 2.91 1.68 0.58 1161 3.61 1.66 0.46 1097...
- Page 21 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-GC25VA MUZ-GC25VAH CAPACITY:3.2(kW) INPUT:835(W) OUTDOOR WB( : ) 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 2.14 2.53...
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Page 22: Actuator Control
ACTUATOR CONTROL MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH 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 23: Service Functions
SERVICE FUNCTIONS MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH 10-1. 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 11-6-1.) Defrost finish temperature (:) Jumper wire MUZ-GC25VA MUZ-GC25VAH MUZ-GC35VA... -
Page 24: Outdoor Unit
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 25: Outdoor Unit
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 26: Outdoor Unit
3. Outdoor unit failure mode table The upper lamp of Indoor/outdoor Outdoor unit Abnormal point LED indication Condition Correspondence OPERATION INDICATOR unit failure mode failure mode (Failure mode / protection) (Outdoor P.C. board) recall function recall function lamp(Indoor unit) None (Normal) Outdoor power system Over current protection stop is •Reconnect connectors. -
Page 27: Outdoor Unit
11-3. Troubleshooting check table Symptom LED indication Abnormal point/ Condition Condition Correspondence Over current protection stop is continuously performed three · Reconnect connector of compressor. 1-time flash every Outdoor power Outdoor unit · Refer to 11-5.A "How to check times within 1 minute after the compressor gets started, or 2.5 seconds system does not... - Page 28 11-4. Trouble criterion of main parts MUZ-GC25VA MUZ-GC35VA MUZ-GC25VAH MUZ-GC35VAH 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.
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Page 29: Outdoor Unit
11-5. Troubleshooting flow When OPERATION INDICATOR lamp flashes 5-times. 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 11-5.B “Check of open phase” . between terminals. - Page 30 Check of compressor winding 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 w Measure the resistance between the BLK-RED lead wires at 3 points. WHT-RED <<Judgement>>...
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Page 31: Outdoor Unit
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 resistance between CN641 1 and 2. - Page 32 Outdoor fan motor does not operate. Check of outdoor fan motor MUZ-GC25VA MUZ-GC25VAH Check the resistance of fan motor. (Refer to 11-4.) Replace the outdoor Is the resistance of fan fan motor. motor normal? Disconnect the connector CN771 on inverter P.C. board.
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Page 33: Outdoor Unit
Inverter does not operate. Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press Rectify indoor/ outdoor EMERGENCY OPERATION connecting wire. switch. Does the upper lamp of Is there voltage 230V AC Replace the indoor OPERATION INDICATOR between the indoor... -
Page 34: Check Of Lev (Expansion Valve)
Heating/Cooling does not work sufficiently. Check of LEV (Expansion valve) Turn ON the power supply. < Preparation of the remote controller > 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. 2 First, release RESET button. - Page 35 Outdoor fan motor does not operate , or stops immediately after starting up. Check of inverter P.C. board MUZ-GC35VA MUZ-GC35VAH Check the outdoor fan motor. (Refer to11-5.I.) Is the fuse (F901) blown on the inverter P.C. board? Inverter P.C.board Check the connection of the connectors. (Solder side) (CN931, CN932) of outdoor fan motor.
- Page 36 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-seconds. Outdoor unit doesn’t operate. How to check mis-wiring and serial signal error (when outdoor unit does not work) Is there rated voltage in Check the power Turn OFF the power supply.
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Page 37: Electromagnetic Noise Enters Into Tv Sets Or Radios
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 38 Outdoor base gets frozen. Check of defrost heater MUZ-GC25VAH MUZ-GC35VAH Check the following points before checking electric continuity. 1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. 2) Is the resistance of defrost heater normal? Refer to 11-4. 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 below, and let...
- Page 39 11-6. Test point diagram and voltage 1. Inverter P.C. board MUZ-GC25VA MUZ-GC25VAH Smoothing capacitor Fuse Smoothing capacitor Varistor Varistor (C62) (F801) (C61) (NR62) (NR61) Varistor 230V AC Back side of unit (NR63) DB61 DB61 280V ~ 370V Fuse Output to (F701) drive compressor...
- Page 40 1. Inverter P.C. board MUZ-GC35VA MUZ-GC35VAH Back side of unit 230V AC Smoothing capacitor Smoothing capacitor Smoothing capacitor DB61 DB61 (C63C) (C63B) (C63A) 280V ~ 370V FUSE (F801) FUSE (F901) LED monitor lamp Output to drive compressor (LDW, LDV, LDU) 1(+) 2(+) 3(+)
- Page 41 2. Power P.C. board MUZ-GC35VA MUZ-GC35VAH Back side of unit Front side of unit Varistor Varistor Varistor (NR63) (NR62) (NR64) 230V AC R.V.coil(CN721) 230V AC Connecting wire with FUSE 230V AC inverter P.C.board (F71) Heater connector (CN726) (CN722) MUZ-GC35VAH...
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Page 42: 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 43 OPERATING PROCEDURE PHOTOS Photo 3 2. Removing the inverter assembly, inverter P.C. board Screws of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel (2) Disconnect the earth wires (See Photo 3.), the lead wire to the reactor and the following connectors; Screw of <Inverter P.C.
- Page 44 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut. (See Photo 7.) (4) Remove the propeller. (See Photo 7.) (5) Remove the screws fixing the fan motor.
- Page 45 12-2. MUZ-GC35VA MUZ-GC35VAH NOTE : Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the cabinet (1) Remove the screw fixing the service panel. (See Photo 2.) (2) Pull down the service panel and remove it. (See Photo 2.) Screws Screw of of the...
- Page 46 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and power P.C. board (1) Remove the cabinet and panels. (Refer to 1.) Screws of the (2) Disconnect the earth wires (See Photo 3.), the lead wire to relay panel the reactor and the following connectors;...
- Page 47 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut. (See Photo 7.) (4) Remove the propeller. (See Photo 7.) (5) Remove the screws fixing the fan motor.
- Page 48 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2007. No. OBH469 6 New publication, effective Jan. 2007 Made in Japan Specifications subject to change without notice.