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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 -
•As for indoor unit MCFH-A12WV -
E1
E1
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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
MUH-A07YV -
E1
7. REFRIGERANT SYSTEM DIAGRAM ················8
MUH-A09YV -
E1
8. PERFORMANCE CURVES ································9
MUH-A12YV -
E1
9. MICROPROCESSOR CONTROL ····················22
10. SERVICE FUNCTIONS·····································24
11. TROUBLESHOOTING ······································24
12. DISASSEMBLY INSTRUCTIONS·····················31
13. PARTS LIST······················································34
, refer to the service manual OB329.
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, refer to the service manual OB336.
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Revision A:
MUH-A12YV -
can be connected to
E1
MCFH-A12WV -
.
E1
Please void OB331.
HFC
REVISED EDITION-A
utilized
R410A
No. OB331
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Table of Contents
Related Manuals for Mitsubishi Electric MUH-A09YV-E1
Summary of Contents for Mitsubishi Electric MUH-A09YV-E1
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Page 1: Table Of Contents
Revision A: MUH-A12YV - can be connected to SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS MCFH-A12WV - Please void OB331. No. OB331 REVISED EDITION-A utilized SERVICE MANUAL R410A Wireless type Models MUH-A07YV - MUH-A09YV - MUH-A12YV - CONTENTS 1. TECHNICAL CHANGES ····································2 2. -
Page 2: Technical Changes
Revision A: •MUH-A12YV - can be connected to MCFH-A12WV - SPECIFICATION, PERFORMANCE CURVES and TROUBLESHOOTING have been added. 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. - Page 3 New Specification Current Specification The incompatible refrigerating oil easily separates from Since refrigerant and refrigerating oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigerating oil backs to the compressor through the lower Raising position of the oil back hole enables to back the 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 For liquid 6.35 0.8 mm Heat resisting foam plastic 0.8 mm 9.52 For gas Specific gravity 0.045 Thickness 8 mm 0.8 mm 12.7 •...
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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 - Air inlet <Outdoor unit: MUH type> (back and side) Drain socket Piping Drain cap Drain hose Air outlet Drain outlet SPECIFICATION MUH-A12YV - MUH-A12YV - Indoor model MUH-A07YV - MUH-A09YV -... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MUH-A07YV- MUH-A09YV- SPL(dB LINE SPL(dB LINE FUNCTION 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: Max. Refrigerant Piping Length
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 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. 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-A07YV -...
- Page 12 MUH-A12YV - MUH-A12YV - (kgf/F[Gauge])(MPa[Gauge]) ( Indoor unit : MCFH-A12WV - ( Indoor unit : MCFH-A12WV - 230V 230V 35 (:) 35 (:) 70(%) 70 (%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) HEAT operation Outdoor:Dry bulb temperature 7,15,20°C Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Wet bulb temperature 6,12,14.5°C...
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Page 13: Performance Data
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 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...
- 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 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...
- 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...
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Page 19: Qshc Shf Input
PERFORMANCE DATA COOL operation (230V) MCFH-A12WV - : MUH-A12YV - CAPACITY :3.5(KW) SHF :0.70 INPUT :1160(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 2.14 0.52 3.94 2.05 0.52 3.78 1.97 0.52 1021 3.64 1.89 0.52... - Page 20 PERFORMANCE DATA COOL operation (230V) MCFH-A12WV - : MUH-A12YV - CAPACITY :3.5(KW) SHF :0.70 INPUT :1160(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.78 0.52 1137 3.15 1.64 0.52 1206 3.03 1.57 0.52 1230 3.61 1.44 0.40 1183...
- Page 21 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 22: 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 23: Operation
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... -
Page 24: 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 30.) Defrost thermistor RT61 must read below -3°C. -
Page 25: Emergency Operation
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 26 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 Normal Abnormal thermistor (RT63) 5kΩ ~ 60kΩ Open or short-circuit Compressor Measure the resistance between the terminals with a tester.
- Page 27 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 28 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 Example 1 Set the switch(SW2-2) on indoor electronic control P.C. board to Indoor unit MSC type MU or MUX type, when the outdoor unit is MU or MUX type.
- Page 29 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 30 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 24.) Jumper wire for change in defrost setting...
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Page 31: 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 32: Operating Procedure
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 33 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 34: 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. Remarks Part name in Wiring MUH-A07YV- MUH-A09YV- MUH-A12YV- Diagram E02 835 630 OUTDOOR HEAT EXCHANGER E02 836 630 OUTDOOR HEAT EXCHANGER... - Page 35 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 name in Wiring Part No.
- 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 Feb. 2004. No.OB331 REVISED EDITION-A 6 New publication, effective Feb. 2004 Distributed in Dec. 2003. No.OB331 6 Specifications subject to change without notice.
- Page 37 Related Links Model Number: MUH-A12YV MUH-A07-12YV_Parts_Catalog_(OB331A) MUH-A07-12YV_Service_Manual_(OB331A)
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