Mitsubishi Electric MUH-GA35VB Service Manual
Split-type, heat pump air conditioners, wireless type models
Hide thumbs
Also See for MUH-GA35VB:
- Manual (586 pages) ,
- Service technical manual (164 pages) ,
- Installation manual (4 pages)
Table of Contents
Advertisement
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MUH-GA20VB -
MUH-GA25VB -
MUH-GA35VB -
NOTE:
•This manual describes technical data of outdoor units.
•As for indoor units MSC-GA20/GA25/GA35VB -
•As for indoor units MSC-CA20/CA25/CA35VB -
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES ·······························7
Indication of
5. OUTLINES AND DIMENSIONS ·························8
model name
6. WIRING DIAGRAM ············································9
MUH-GA20VB -
E1
7. REFRIGERANT SYSTEM DIAGRAM ··············10
MUH-GA25VB -
E1
8. PERFORMANCE CURVES ······························11
MUH-GA35VB -
E1
9. SERVICE FUNCTIONS ····································22
10. TROUBLESHOOTING······································22
11. DISASSEMBLY INSTRUCTIONS·····················29
12. PARTS LIST······················································32
, refer to the service manual OB385.
E1
, refer to the service manual OB393.
E1
HFC
utilized
R410A
No. OB387
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUH-GA35VB
Summary of Contents for Mitsubishi Electric MUH-GA35VB
-
Page 1: Table Of Contents
No. OB387 utilized SERVICE MANUAL R410A Wireless type Models MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················6 3. SPECIFICATION·················································6 4. NOISE CRITERIA CURVES ·······························7 Indication of 5. OUTLINES AND DIMENSIONS ·························8 model name 6. -
Page 2: Technical Changes
6. Compressor capacitor has been changed. 7. Outdoor heat exchanger has been changed. (2 Row 1 Row) MUH-A12YV- MUH-GA35VB- 1. Indication of capacity has been changed. (BTU base 2. Dimension of outdoor unit has been changed. (780Wo540Ho255D 800Wo550Ho285D) 3. Stop valve cover has been added. - 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 conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required.
- 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 3.Refrigeration oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 4.Air purge •...
-
Page 6: 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... -
Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUH-GA20VB- MUH-GA25VB- FUNCTION SPL(dB LINE SPL(dB LINE FUNCTION 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... -
Page 8: 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... -
Page 9: Wiring Diagram
WIRING DIAGRAM MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - MODELS WIRING DIAGRAM OUTDOOR UNIT 21S4 RT61 CN661 CN721 CN711 CIRCUIT BREAKER SR61 TAB20 NAME SYMBOL SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR TRANS FORMER OUTDOOR FAN MOTOR (INNER FUSE) TERMINAL BLOCK OUTDOOR FAN CAPACITOR... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - Unit:mm 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[1.4x1000(MUH-GA25VB) -
Page 11: Performance Curves
Indoor unit MUH-GA20VB - Gas 0 Gas 0.43 MUH-GA25VB - 9.52 6.35 Liquid 0 Liquid 0.5 MUH-GA35VB - MAX. HEIGHT DIFFERENCE Indoor unit Height difference should be within Refrigerant Piping 10m regardless of which unit, Max.length w Max. Height indoor or outdoor position is high. -
Page 12: Indoor Unit
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 13 Ambient humidity(%) MUH-GA25VB - MUH-GA25VB - (kgf/F[Gauge])(MPa[Gauge]) 230V 230V 35(:) 35(:) 70(%) 70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) MUH-GA35VB - (kgf/F[Gauge])(MPa[Gauge]) MUH-GA35VB - 230V 230V 35(:) 35 (:) 70(%) 70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%)
-
Page 14: Heat Operation
HEAT operation Condition indoor:Dry bulb temperature 20.0°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 14.5°C Wet bulb temperature 6,12,14.5°C MUH-GA25VB - MUH-GA20VB - 230V 230V Ambient temperature(˚C) Ambient temperature(˚C) MUH-GA35VB - 230V Ambient temperature(˚C) - Page 15 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...
- Page 16 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 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...
- Page 17 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 SHC SHF INPUT DB(:) WB(:) 3.11 1.62 0.52 2.98 1.55 0.52 2.86 1.49 0.52 2.76 1.43 0.52...
- Page 18 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 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...
- Page 19 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...
- Page 20 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 3.43 1.65 0.48 1068 3.15 1.51 0.48 1134 3.03 1.45 0.48...
- Page 21 1.80 2.16 2.55 2.91 3.30 3.66 4.04 1.62 2.01 2.37 2.76 3.15 3.51 3.90 MSC-GA35VB - : MUH-GA35VB - CAPACITY : 3.7(kW) INPUT : 1020(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.33 2.81 3.29 3.77 4.26...
-
Page 22: Service Functions
SERVICE FUNCTIONS MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - 9-1. 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 10-5.) Defrost thermistor RT61 must read below -3°C. - Page 23 10-2. 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.
-
Page 24: Troubleshooting Flow
10-3. Trouble criterion of main parts MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - Figure Part name Check method and criterion Measure the resistance with a tester. (Part temperature –10°C ~ 40°C) Defrost Abnormal Normal thermistor (RT63) Open or short-circuit 5kΩ ~ 60kΩ... - Page 25 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? compressor contactor (52C) and N on the Rectify the connecting wire.
- Page 26 When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. 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 27 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 Turn OFF the resistance Is the resistance of Does the unit operate supply and press between CN 661...
- Page 28 10-5. 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...
-
Page 29: Disassembly Instructions
Locking lever lever. Connector MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the top panel. (2) Remove the screw of the service panel. - Page 30 OPERATING PROCEDURE PHOTOS 2. Removing the deicer P.C. board Photo 4 (1) Remove the service panel and the cabinet. (2) Disconnect all the connectors and the terminals on the Screw of the Deicer deicer P.C. board. relay panel Relay panel P.C.
- Page 31 OPERATING PROCEDURE PHOTOS 4. Removing the compressor Photo 6 (1) Remove the cabinet. (Refer to 1.) Discharge pipe (2) Remove the relay panel. (3) Remove the soundproof felt. 4-Way valve (4) Remove the terminal cover on the compressor. (5) Disconnect lead wires from the glass terminal of the com- pressor.
-
Page 32: Parts List
PARTS LIST MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - 12-1. OUTDOOR UNIT STRUCTURAL PARTS (W) This figure shows MUH-GA20VB. - Page 33 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - 12-1. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring MUH-GA20VB MUH-GA25VB MUH-GA35VB Remarks Part name Part No. Diagram E02 904 630 OUTDOOR HEAT EXCHANGER...
- Page 36 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 Feb. 2005 Distributed in Feb. 2005. No.OB387 6 Specifications subject to change without notice. Made in Japan...