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SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MU-GA20VB -
MU-GA25VB -
MU-GA35VB -
NOTE:
•This service manual describes technical data of outdoor units.
•As for indoor units MSC-GA20VB -
refer to the service manual OB385.
•As for indoor units MSC-CA20VB -
refer to the service manual OB393.
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CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES ·······························6
Indication of
5. OUTLINES AND DIMENSIONS ·························7
model name
6. WIRING DIAGRAM ············································7
MU-GA20VB -
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7. REFRIGERANT SYSTEM DIAGRAM ················8
MU-GA25VB -
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8. PERFORMANCE CURVES ································9
MU-GA35VB -
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9. TROUBLESHOOTING······································18
10. DISASSEMBLY INSTRUCTIONS·····················21
11. PARTS LIST······················································24
, MSC-GA25VB -
and MSC-GA35VB -
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, MSC-CA25VB -
and MSC-CA35VB -
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HFC
utilized
R410A
,
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,
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No. OB386
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Table of Contents
Related Manuals for Mitsubishi MU-GA20VB
Summary of Contents for Mitsubishi MU-GA20VB
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS No. OB386 utilized SERVICE MANUAL R410A Wireless type Models MU-GA20VB - MU-GA25VB - MU-GA35VB - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························6 Indication of 5. OUTLINES AND DIMENSIONS ·························7 model name 6. -
Page 2: Technical Changes
TECHNICAL CHANGES MU-A07YV- MU-GA20VB- 1. Indication of capacity has been changed.(BTU base kW base) 2. Unit size has been changed. (W780 mm x H 540 mm x D 255 mm W800 mm x H 550 mm x D 285 mm) 3. - 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 Heat resisting foam plastic For liquid 0.8 mm 6.35 Specific gravity 0.045 Thickness 8 mm For gas 9.52 0.8 mm •...
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS OUTDOOR UNIT MU-GA20VB - Air inlet MU-GA25VB - back : MU-GA20VB MU-GA25VB MU-GA35VB - back and side : MU-GA35VB Piping Drain hose Air outlet Drain outlet SPECIFICATION Outdoor model MU-GA20VB - MU-GA25VB - MU-GA35VB - Single phase... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MU-GA35VB- MU-GA20VB- SPL(dB LINE FUNCTION SPL(dB LINE FUNCTION MU-GA25VB- COOL COOL Test conditions, Test conditions, Cooling :DB35: WB24: Cooling : DB27: WB19: NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE TERESHOLD OF TERESHOLD OF... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MU-GA20VB - MU-GA25VB - MU-GA35VB - Unit: mm OUTDOOR UNIT REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. Drain hole [42 Air in Air in Open two sides of left, right, or rear side. -
Page 8: Refrigerant System Diagram
Refrigerant pipe [9.52 (with heat insulator) Stop valve (with service port) Muffler Outdoor heat Flared connection exchanger Compressor Flared connection Strainer Stop valve #100 Capillary tube [3.0x[1.4x700 (MU-GA20VB, MU-GA25VB) Refrigerant pipe [6.35 [3.0x[1.4x450 (MU-GA35VB) (with heat insulator) Refrigerant flow in cooling... -
Page 9: Performance Curves
MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MU-GA20VB - MU-GA25VB - Gas 0.43 Gas 0 9.52 6.35 Liquid 0.5 Liquid 0 MU-GA35VB - MAX. - Page 10 Air flow should be set at MAX. 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] ) MU-GA20VB - MU-GA20VB - (kgf/F[Gauge])(MPa[Gauge]) 230V...
- Page 11 MU-GA25VB - MU-GA25VB - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35(:) 35 (:) 70(%) 70 (%) Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%) MU-GA35VB - MU-GA35VB - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35(:) 35 (:) 70 (%) 70(%) Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%)
- Page 12 PERFORMANCE DATA COOL operation (230V) MSC-GA20VB - : MU-GA20VB - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 2.70 1.51 0.56 2.59 1.45 0.56...
- Page 13 PERFORMANCE DATA COOL operation (230V) MSC-GA20VB - : MU-GA20VB - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.25 1.26 0.56 2.07 1.16 0.56 1.99 1.11 0.56...
- Page 14 PERFORMANCE DATA COOL operation (230V) MSC-GA25VB - : MU-GA25VB - CAPACITY : 2.5(kW) SHF : 0.70 INPUT : 775(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.53 0.52 2.81 1.46 0.52 2.70 1.40 0.52 2.60 1.35 0.52...
- Page 15 PERFORMANCE DATA COOL operation (230V) MSC-GA25VB - : MU-GA25VB - CAPACITY : 2.5(kW) SHF : 0.70 INPUT : 775(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.27 0.52 2.25 1.17 0.52 2.16 1.12 0.52 2.58 1.03 0.40 2.40 0.96 0.40...
- Page 16 PERFORMANCE DATA COOL operation (230V) MSC-GA35VB - : MU-GA35VB - CAPACITY : 3.45(kW) SHF : 0.66 INPUT : 1120(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.05 1.95 0.48 3.88 1.86 0.48 3.73 1.79 0.48 3.59 1.72 0.48...
- Page 17 PERFORMANCE DATA COOL operation (230V) MSC-GA35VB - : MU-GA35VB - CAPACITY : 3.45(kW) SHF : 0.66 INPUT : 1120(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 3.38 1.62 0.48 1098 3.11 1.49 0.48 1165 2.98 1.43 0.48 1187...
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Page 18: Troubleshooting
TROUBLESHOOTING MU-GA20VB - MU-GA25VB - MU-GA35VB - 9-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and/ or disconnect the power plug. - Page 19 9-2. Instruction of troubleshooting MU-GA20VB - MU-GA25VB - MU-GA35VB - Start Indoor unit OPERATION Indoor unit Indoor unit operates. INDICATOR operates. doesn't receive Outdoor unit lamp on the Outdoor unit the signal from doesn't operate indoor unit is doesn't remote controller.
- Page 20 9-3. Trouble criterion of main parts MU-GA20VB - MU-GA25VB - MU-GA35VB - Figure Part name Check method and criterion MU-GA20/GA25VB Compressor (MC) Measure the resistance between the terminals with a tester. AUX. MAIN INNER (Coil wiring temperature –10°C ~ 40°C)
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Page 21: Disassembly Instructions
1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MU-GA20VB - MU-GA25VB - MU-GA35VB - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the top panel. - Page 22 OPERATING PROCEDURE PHOTOS 2. Removing the electrical parts Photo 4 Terminal (1) Remove the service panel and the cabinet.(Refer to 1.) block(TB2) (2) Remove the following parts. Compressor Compressor Terminal • Compressor capacitor (C1) capacitor (C1) contactor (52C) block(TB1) • Outdoor fan capacitor (C2) •...
- Page 23 OPERATING PROCEDURE PHOTOS 4. Removing the compressor Photo 6 (1) Remove the cabinet. (Refer to 1.) (2) Remove the relay panel. Discharge pipe (3) Remove the soundproof felt. (4) Remove the terminal cover on the compressor. (5) Disconnect lead wires from the glass terminal of the com- pressor.
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Page 24: Parts List
PARTS LIST MU-GA20VB - MU-GA25VB - MU-GA35VB - 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS... - Page 25 MU-GA20VB - MU-GA25VB - MU-GA35VB - 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part name Remarks MU-GA20VB- MU-GA25VB- MU-GA35VB- Diagram...
- Page 28 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN New publication, effective Jan. 2005 C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Specifications subject to change without notice. Distributed in Jan. 2005. No.OB386 6 Made in Japan...