Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MUH-GA20VB-
MUH-GA20VB-
MUH-GA25VB-
MUH-GA25VB-
MUH-GA35VB-
MUH-GA35VB-
MUH-GA20VB
MUH-GA25VB
MUH-GA35VB
NOTE:
• This service manual describes technical data of outdoor units.
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
Revision B:
MUH-GA35VB -
Please void OB387 REVISED EDITION-A.
HFC
utilized
R410A
E1
E2
E1
E2
E1
E3
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································3
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. PERFORMANCE CURVES ································9
9. ACTUATOR CONTROL····································19
10. SERVICE FUNCTIONS·····································20
11. TROUBLESHOOTING ······································20
12. DISASSEMBLY INSTRUCTIONS·····················27
13. PARTS LIST······················································30
14. RoHS PARTS LIST···········································32
has been added.
E3
No. OB387
REVISED EDITION-B
Indoor unit service manual
MSC-GA
VB Series
•
MSC-CA
VB Series
•
MSC-CB
VB Series
•
(OB385)
(OB393)
(OB439)
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUH-GA35VB- E3
Summary of Contents for Mitsubishi Electric MUH-GA35VB- E3
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Page 1: Table Of Contents
Revision B: MUH-GA35VB - has been added. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB387 REVISED EDITION-A. OUTDOOR UNIT No. OB387 SERVICE MANUAL REVISED EDITION-B utilized R410A Wireless type Models MUH-GA20VB- MUH-GA20VB- MUH-GA25VB- MUH-GA25VB- MUH-GA35VB- MUH-GA35VB- Indoor unit service manual MSC-GA VB Series (OB385) -
Page 2: Technical Changes
Revision A: • MUH-GA20VB- and MUH-GA25VB- have been added. Revision B: • MUH-GA35VB- has been added. TECHNICAL CHANGES MUH-A07YV- MUH-GA20VB- 1. Indication of capacity has been changed. (BTU base 2. Dimension of outdoor unit has been changed. (W780mm x H540mm x D255mm W800mm x H550mm x D285mm) 3. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS OUTDOOR UNIT ACCESSORIES MUH-GA20VB MUH-GA20VB MUH-GA25VB MUH-GA25VB MUH-GA35VB MUH-GA35VB Air inlet back : MUH-GA20VB <Outdoor unit: MUH type> back and side : MUH-GA25VB Drain socket MUH-GA35VB Piping Drain hose Air outlet Drain outlet SPECIFICATION MUH-GA20VB - MUH-GA20VB - Outdoor model Single phase... - Page 4 MUH-GA35VB MUH-GA35VB MUH-GA25VB MUH-GA25VB Outdoor model Single phase Single phase Single phase Single phase Outdoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz 230V,50Hz Cooling Heating Cooling Heating Cooling Heating Function Cooling Heating Capacity 2.65 2.65 Dehumidification — — — — Outdoor air flow 1,902 K /h 1,902...
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Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES MUH-GA25VB MUH-GA20VB SPL(dB LINE FUNCTION FUNCTION SPL(dB LINE COOLING COOLING MUH-GA35VB HEATING HEATING Test conditions, Test conditions, Cooling :DB35: WB24: Cooling :DB35: WB24: Heating :DB 7: WB 6: Heating :DB 7: WB 6: NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUH-GA20VB MUH-GA25VB MUH-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 (MUH-GA25 /GA35VB) Open two sides of left, right, or rear side. -
Page 7: Wiring Diagram
WIRING DIAGRAM MUH-GA20VB MUH-GA25VB MUH-GA35VB OUTDOOR UNIT 21S4 RT61 CN661 CN721 CN711 CIRCUIT BREAKER SR61 TAB20 SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR TRANSFORMER OUTDOOR FAN MOTOR (INNER FUSE) OUTDOOR FAN CAPACITOR TB1,TB2 TERMINAL BLOCK DSAR SURGE ABSORBER NR61 VARISTOR R.V. -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit:mm MUH-GA20VB MUH-GA25VB MUH-GA35VB- OUTDOOR UNIT Refrigerant pipe [ 9.52 4-way valve (with heat insulator) Stop valve Outdoor (with service heat port) Defrost Flared connection Muffler exchanger thermistor RT61 Compressor Capillary tube [3.0x[1.4x700 (MUH-GA20VB - [3.0x[1.4x900 (MUH-GA20VB - [3.0x[1.4x1000(MUH-GA25VB - [3.0x[1.6x1500(MUH-GA25VB - Flared connection... -
Page 9: Performance Curves
MAX. REFRIGERANT PIPING LENGTH Refrigerant piping : m Piping size O.D : mm Length of connecting pipe : m Max. length Max. height Model Liquid Indoor unit Outdoor unit MUH-GA20VB Gas 0 Gas 0.43 MUH-GA25VB 9.52 6.35 Liquid 0 Liquid 0.5 MUH-GA35VB MAX. - Page 10 How to measure the indoor air wet-bulb/dry-bulb temperature difference Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.
- Page 11 8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Dry-bulb temperature Relative humidity(%) 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] ) MUH-GA20VB...
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Page 12: Heat Operation
HEAT operation Condition indoor:Dry bulb temperature 20.0°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C Wet bulb temperature 14.5°C MUH-GA25VB MUH-GA20VB 230V 230V Ambient temperature(˚C) Ambient temperature(˚C) MUH-GA35VB 230V Ambient temperature(˚C) - Page 13 PERFORMANCE DATA COOL operation (230V) MSC-GA20VB : MUH-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 SHC SHF INPUT 2.70 1.51 0.56 2.59 1.45 0.56 2.48 1.39 0.56 2.39 1.34 0.56 2.82 1.24 0.44...
- Page 14 PERFORMANCE DATA COOL operation (230V) MSC-GA20VB : MUH-GA20VB CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 2.25 1.26 0.56 2.07 1.16 0.56 1.99 1.11 0.56 2.37 1.04 0.44 2.21 0.97 0.44 2.13 0.94 0.44...
- Page 15 PERFORMANCE DATA COOL operation (230V) MSC-GA25VB : MUH-GA25VB CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.11 1.62 0.52 2.98 1.55 0.52 2.86 1.49 0.52 2.76 1.43 0.52 3.25 1.30 0.40...
- Page 16 PERFORMANCE DATA COOL operation (230V) MSC-GA25VB : MUH-GA25VB CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 2.60 1.35 0.52 2.39 1.24 0.52 2.29 1.19 0.52 2.73 1.09 0.40 2.54 1.02 0.40 2.45 0.98 0.40...
- Page 17 PERFORMANCE DATA COOL operation (230V) MSC-GA35VB : MUH-GA35VB CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 1.97 0.48 3.94 1.89 0.48 3.78 1.81 0.48 3.64 1.75 0.48 1003...
- Page 18 PERFORMANCE DATA COOL operation (230V) MSC-GA35VB : MUH-GA35VB CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 3.43 1.65 0.48 1068 3.15 1.51 0.48 1134 3.03 1.45 0.48 1155 3.61 1.30 0.36...
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Page 19: Actuator Control
PERFORMANCE DATA HEAT operation (230V) MSC-GA20VB : MUH-GA20VB CAPACITY : 2.5(kW) INPUT : 690(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.58 1.90 2.23 2.55 2.88 3.18 3.50 1.50 1.80 2.13 2.43 2.75 3.05 3.36 1.35 1.68 1.98 2.30... -
Page 20: Service Functions
SERVICE FUNCTIONS MUH-GA20VB MUH-GA25VB MUH-GA35VB 10-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JPDS and JPSG on the outdoor deicer P.C. board, defrosting mode can be accom- plished regardless of the defrost interval restriction. (Refer to 11-5.) Defrost thermistor RT61 must read below -3°C. - Page 21 11-2. Instruction of troubleshooting MUH-GA20VB MUH-GA25VB MUH-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. normally. flashing on operate.
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Page 22: Troubleshooting Flow
11-3. Trouble criterion of main parts MUH-GA20VB MUH-GA25VB MUH-GA35VB Figure Part name Check method and criterion Measure the resistance with a tester. Defrost (Part temperature –10°C ~ 40°C) thermistor Refer to 11-5. “Test point diagram and voltage”, “Outdoor deicer (RT63) P.C. - Page 23 Compressor and/or outdoor fan motor doesn’t stop. B B Check of outdoor unit Start Turn OFF the power supply. After 1 minute, turn ON power supply again. Is there 230V AC between 3 on the Does compressor stop? Rectify the connecting wire. compressor contactor (52C) and N on the outdoor terminal block (TB1)? Replace the...
- Page 24 When OPERATION INDICATOR lamp flashes 0.5-second intervals. Outdoor unit does not operate. D D How to check mis-wiring and serial signal error 1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work.
- Page 25 When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal. E E Check of outdoor thermistor Start Replace the deicer P.C. board. Defrost thermistor (RT61) Reconnect CN661. Measure Turn ON the power resistance Turn OFF the Is the resistance of supply and press Does the unit operate between CN 661...
- Page 26 11-5. Test point diagram and voltage MUH-GA20VB MUH-GA25VB MUH-GA35VB Outdoor deicer P.C. board CN711 CN721 Power supply input Outdoor fan motor R.V. coil 230V AC 230V AC 230V AC NR61 Varistor Fuse 2A/250V R601 5~10VDC Defrost interval time short pin (JPDS, JPSG) (Refer to 10-1.) Jumper wire for...
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Page 27: 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 28 OPERATING PROCEDURE PHOTOS 2. Removing the deicer P.C. board Photo 4 (1) Remove the service panel and the cabinet. Screw of the Deicer (2) Disconnect all the connectors and the terminals on the relay panel Relay panel P.C. board deicer P.C. board. (3) Remove the deicer P.C.
- Page 29 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the compressor (1) Remove the cabinet. (Refer to 1.) (2) Remove the relay panel. (3) Remove the soundproof felt. (4) Remove the terminal cover on the compressor. Discharge pipe 4-Way valve (5) Disconnect lead wires from the glass terminal of the com- pressor.
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Page 30: Parts List
PARTS LIST (non-RoHS compliant) MUH-GA20VB MUH-GA25VB MUH-GA35VB 13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS This figure shows MUH-GA20VB. - Page 31 PARTS LIST (non-RoHS compliant) MUH-GA20VB MUH-GA25VB MUH-GA35VB 13-1. 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 name MUH-GA20VB MUH-GA25VB MUH-GA35VB Remarks Part No. Diagram E02 904 630 OUTDOOR HEAT EXCHANGER...
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Page 32: Rohs Parts List
RoHS PARTS LIST (RoHS compliant) MUH-GA20VB MUH-GA25VB MUH-GA35VB 14-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS This figure shows MUH-GA20VB. - Page 33 RoHS PARTS LIST (RoHS compliant) MUH-GA20VB MUH-GA25VB MUH-GA35VB 14-1. 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 Remarks Part name MUH-GA25VB- Part No. MUH-GA20VB- MUH-GA35VB- Diagram E12 904 630...
- Page 36 HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2007. No.OB387 REVISED EDITION-B 6 Distributed in May 2006. No.OB387 REVISED EDITION-A 6 Distributed in Feb. 2005. No.OB387 6 New publication, effective May 2007 Made in Japan Specifications subject to change without notice.
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