Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MUH-A07YV -
MUH-A09YV -
MUH-A12YV -
NOTE:
•This manual describes technical data of outdoor units.
•As for indoor units MSC-A07/A09/A12YV -
E1
E1
E1
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
MUH-A07YV -
E1
7. REFRIGERANT SYSTEM DIAGRAM ················8
MUH-A09YV -
E1
8. PERFORMANCE CURVES ································9
MUH-A12YV -
E1
9. MICROPROCESSOR CONTROL ····················20
10. SERVICE FUNCTIONS·····································22
11. TROUBLESHOOTING ······································22
12. DISASSEMBLY INSTRUCTIONS·····················29
13. PARTS LIST······················································32
, refer to the service manual OB329.
E1
HFC
utilized
R410A
No. OB331
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Related Manuals for Mitsubishi Electric MUH-A07YV-E1
Summary of Contents for Mitsubishi Electric MUH-A07YV-E1
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB331 utilized SERVICE MANUAL R410A Wireless type Models MUH-A07YV - MUH-A09YV - MUH-A12YV - 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 MUH-A07WV- MUH-A07YV- 1. Outdoor heat exchanger has changed. 2. Outdoor fan motor has changed. (RA6V23-FB RC6V20-AB) MUH-A09WV- MUH-A09YV- MUH-A12WV- MUH-A12YV- 1. Outdoor heat exchanger has changed. 2. Outdoor fan motor has changed. (RA6V33-DB RA6V33-FB) INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT •... - Page 3 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 4 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.
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS OUTDOOR UNIT ACCESSORIES MUH-A07YV- MUH-A07YV - MUH-A09YV- MUH-A09YV - MUH-A12YV- MUH-A12YV - <Outdoor unit: MUH type> Air inlet (back and side) Drain socket Piping Drain cap Drain hose Air outlet Drain outlet SPECIFICATION Outdoor model MUH-A07YV - MUH-A09YV - MUH-A12YV - Single phase... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MUH-A07YV- MUH-A09YV- FUNCTION SPL(dB LINE SPL(dB LINE FUNCTION COOL COOL MUH-A12YV- HEAT HEAT 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 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUH-A07YV - MUH-A09YV - MUH-A12YV - Unit: mm REQUIRED SPACE OUTDOOR UNIT Air in Air in Drainage 3holes [33 Air out Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52 (MUH-A07/A09YV ) [12.7 (MUH-A12YV ) WIRING DIAGRAM... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUH-A07YV - Unit:mm MUH-A09YV - OUTDOOR UNIT Refrigerant pipe [ 9.52 4-way valve (with heat insulator) Defrost Stop valve thermistor Outdoor (with service RT61 heat port) Flared connection Muffler exchanger Capillary tube [3.0x[1.4x800(2 pcs) Compressor (MUH-A07YV) Capillary tube [3.0x[1.4x500(2 pcs) [3.0x[1.4x500(MUH-A07YV) (MUH-A09YV) -
Page 9: Performance Curves
MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Outdoor unit Liquid Indoor unit MUH-A07YV - Gas 0 Gas 0.43 9.52 MUH-A09YV - 6.35 Liquid 0 Liquid 0.5 MUH-A12YV - 12.7 MAX. -
Page 10: 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 11 8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Relative humidity(%) Dry-bulb temperature 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-A07YV -...
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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 14.5°C Wet bulb temperature 6,12,14.5°C MUH-A09YV - MUH-A07YV - 230V 230V Ambient temperature(˚C) Ambient temperature(˚C) MUH-A12YV - 230V Ambient temperature(˚C) - Page 13 PERFORMANCE DATA COOL operation (230V) MSC-A07YV - : MUH-A07YV - 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 14 PERFORMANCE DATA COOL operation (230V) MSC-A07YV - : MUH-A07YV - 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 15 PERFORMANCE DATA COOL operation (230V) MSC-A09YV - : MUH-A09YV - CAPACITY : 2.55(KW) SHF : 0.70 INPUT : 795(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.00 1.56 0.52 2.87 1.49 0.52 2.75 1.43 0.52 2.65 1.38 0.52...
- Page 16 PERFORMANCE DATA COOL operation (230V) MSC-A09YV - : MUH-A09YV - CAPACITY : 2.55(KW) SHF : 0.70 INPUT : 795(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.50 1.30 0.52 2.30 1.19 0.52 2.21 1.15 0.52 2.63 1.05 0.40 2.45 0.98 0.40...
- Page 17 PERFORMANCE DATA COOL operation (230V) MSC-A12YV - : MUH-A12YV - CAPACITY : 3.5(KW) SHF : 0.66 INPUT : 1090(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 4.11 1.97 0.48 3.94 1.89 0.48 3.78 1.81 0.48 3.64 1.75 0.48...
- Page 18 PERFORMANCE DATA COOL operation (230V) MSC-A12YV - : MUH-A12YV - 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 1155...
- Page 19 PERFORMANCE DATA HEAT operation (230V) MSC-A07YV - : MUH-A07YV - 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...
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Page 20: Microprocessor Control
MICROPROCESSOR CONTROL MUH-A07YV - MUH-A09YV - MUH-A12YV - 9-1. HEAT ( ) OPERATION 1. High pressure protection During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT12 for excess rise protection of compressor discharge pressure. Outdoor fan OFF: 52: Outdoor fan Outdoor fan ON: 48:... - Page 21 Operation time chart Example Defrost thermistor RT61 10.1: or more -3: or less Outdoor 52C contactor (Compressor) (R.V. coil) 15 sec. 30 sec. 30 sec. 5 sec. SR61 Outdoor fan Defrost counter Max 10 min. NOTE Indoor fan Very Low Indoor Horizontal Horizontal vane...
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Page 22: Service Functions
SERVICE FUNCTIONS MUH-A07YV - MUH-A09YV - MUH-A12YV - 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 page 28.) Defrost thermistor RT61 must read below -3°C. - Page 23 11-2. Instruction of troubleshooting MUH-A07YV - MUH-A09YV - MUH-A12YV - 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.
- Page 24 11-3. Trouble criterion of main parts MUH-A07YV - MUH-A09YV - MUH-A12YV - 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 Compressor Measure the resistance between the terminals with a tester.
- 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 MUH-A07YV - MUH-A09YV - MUH-A12YV - 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 page 22.) Jumper wire for change in defrost setting...
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Page 29: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. - 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 Deicer deicer P.C. board. Screws P.C. board (3) Remove the deicer P.C. board. Terminal Relay panel Screw...
- Page 31 OPERATING PROCEDURE PHOTOS 4. Removing the compressor Photo 6 (1) Remove the cabinet. (Refer to 1.) (2) Remove the relay panel. Suction pipe 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 32: Parts List
PARTS LIST MUH-A07YV - MUH-A09YV - MUH-A12YV - 13-1. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part name Remarks in Wiring MUH-A07YV- MUH-A09YV- MUH-A12YV- Diagram E02 835 630 OUTDOOR HEAT EXCHANGER E02 836 630 OUTDOOR HEAT EXCHANGER... - Page 33 MUH-A07YV - MUH-A09YV - MUH-A12YV - 13-3. ACCESSORY 13-2. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 13-2. OUTDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part name in Wiring Remarks MUH-A07YV-...
- Page 36 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2003. No.OB331 6 New publication, effective Dec. 2003 Made in Japan Specifications subject to change without notice.