Mitsubishi MUH-A18WV Service Manual
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Mitsubishi MUH-A18WV Service Manual

Mitsubishi MUH-A18WV Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MUH-A18WV -
MUH-A24WV -
MUH-A30WV -
NOTE:
•This service manual describes technical data of outdoor unit.
As for indoor unit MSH-A18WV-
refer to the service manual OB321.
E1
E1
E1
Indication of model name
MUH-A18WV -
E1
, MSH-A24WV-
and MSH-A30V-
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················6
3. SPECIFICATION·················································7
4. NOISE CRITERIA CURVES ·······························8
5. OUTLINES AND DIMENSIONS ·························9
6. WIRING DIAGRAM ··········································10
7. REFRIGERANT SYSTEM DIAGRAM ··············12
8. PERFORMANCE CURVES ······························15
9. MICROPROCESSOR CONTROL ····················25
10. SERVICE FUNCTIONS·····································29
11. TROUBLESHOOTING ······································29
12. DISASSEMBLY INSTRUCTIONS·····················39
13. PARTS LIST······················································43
,
E1
No. OB322

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB322 SERVICE MANUAL Wireless type Models MUH-A18WV - MUH-A24WV - MUH-A30WV - CONTENTS 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················6 3. SPECIFICATION·················································7 4. NOISE CRITERIA CURVES ·······························8 5. OUTLINES AND DIMENSIONS ·························9 6.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MUH-18RV - MUH-A18WV - 1. Refrigerant has changed. (R22 R410A) 2. Refrigerant system diagram has changed. • Compressor, stop valve and 4-way valve have changed. • Diameter of stop valve has changed. (Gas: [15.88 [12.7) • Accumulator has removed and high pressure receiver has been added.
  • Page 4 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 5 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall Pipe Insulation material thickness 0.8 mm 6.35 For liquid Heat resisting foam plastic 0.8 mm 9.52 0.8 mm Specific gravity 0.045 Thickness 8 mm 12.7 For gas 1.0 mm...

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS OUTDOOR UNIT MUH-A18WV - MUH-A24WV - MUH-A30WV - Air inlet Air inlet (back and side) (back and side) Piping Drainage hose Air outlet Air outlet Drain outlet ACCESSORIES Outdoor unit MUH-A24WV- MUH-A18WV- MUH-A30WV- Drain socket Drain cap {33 Drain cap {16 —...

  • Page 7: Specification

    SPECIFICATION Outdoor model MUH-A18WV - MUH-A24WV - Cooling Heating Cooling Heating Function Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity — Dehumidification — Air flow(High) K /h 2,196 2,760 Starting current Compressor motor current 7.54 6.84 9.81 10.12...

  • Page 8: Noise Criteria Curves

    NOISE CRITERIA CURVES MUH-A18WV- MUH-A24WV- FAN SPEED FAN SPEED SPL(dB(A)) LINE SPL(dB(A)) LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUH-A18WV- Unit: mm OUTDOOR UNIT Drainage hole [16.2 Air in Air in Drainage Air out 3holes [33 Service panel Liquid refrigerant pipe joint Refregerant pipe (flared) [6.35 Gas refregerant pipe joint Refregerant pipe (flared) [12.7 Open as a rule...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MUH-A18WV - MODEL WIRING DIAGRAM OUTDOOR UNIT 21S4 RT61 CN661 CN721 2 3 4 INDOOR UNIT CN711 CONNECTING CIRCUIT BREAKER SR61 POWER SUPPLY ~ /N TAB20 230V 50Hz DEICER P.C.BOARD SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR...

  • Page 11: Outdoor Unit

    MUH-A30WV - MODEL WIRING DIAGRAM OUTDOOR UNIT RT61 RT62 RT63 CIRCUIT BREAKER CN711 1 2 3 CN661 CN662 CN724 CN721 SR62 21S4 SR61 TAB52 COM NO CN730 NR61 DEICER PC BOARD SYMBOL SYMBOL NAME SYMBOL NAME NAME CZ SURGE ABSRBER OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK COMPRESSOR CAPACITOR...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUH-A18WV - Unit:mm OUTDOOR UNIT Refrigerant pipe [12.7 4- way valve (with heat insulator) Oil separator Stop valve #100 (with service port) Outdoor heat Defrost Flared connection exchanger thermistor RT61 Capillary tube [2.5o[0.6o1,000 Compressor Capillary tube [3.0o[1.6o750...
  • Page 13 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-A18WV - 12.7 6.35 Gas 0.43 Gas 0 MUH-A24WV - Liquid 0.5 Liquid 0 15.88 MUH-A30WV - 9.52...
  • Page 14 ADDITIONAL REFRIGERANT CHARGE(R410A : g) Refrigerant piping length (one way) Outdoor unit precharged Model 1,750 MUH-A18WV - Calculation : Xg=20g/m (Refrigerant piping length (m)–7) Refrigerant piping length (one way) Model Outdoor unit precharged 2,150 MUH-A24WV - Calculation : Xg=20g/m (Refrigerant piping length (m)–7)

  • Page 15: Performance Curves

    PERFORMANCE CURVES MUH-A18WV - MUH-A24WV - MUH-A30WV - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 16 2 2 Air flow should be set at MAX. 3 3 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]) (kgf/F[Gauge])(MPa[Gauge]) MUH-A18WV - MUH-A18WV - 230V 230V 35(:)

  • Page 17: Heat Operation

    Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C MUH-A18WV - MUH-A24WV - 230V 230V Ambient temperature(˚C) Ambient temperature(˚C) MUH-A30WV - 230V Ambient temperature(˚C)
  • Page 18 PERFORMANCE DATA COOL operation MSH-A18WV - : MUH-A18WV - (230V) CAPACITY : 5.0(KW) SHF : 0.65 INPUT : 1780(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.88 2.76 0.47 1424 5.63 2.64 0.47...
  • Page 19 PERFORMANCE DATA COOL operation MSH-A18WV - : MUH-A18WV - (230V) CAPACITY : 5.0(KW) SHF : 0.65 INPUT : 1780(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.30 0.47 1744 4.50 2.12 0.47 1851 4.33 2.03 0.47...
  • Page 20 PERFORMANCE DATA COOL operation MSH-A24WV - : MUH-A24WV - (230V) CAPACITY : 6.3(KW) SHF : 0.64 INPUT : 2410(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 7.40 3.41 0.46 1928 7.09 3.26 0.46 2024...
  • Page 21 PERFORMANCE DATA COOL operation MSH-A24WV - : MUH-A24WV - (230V) CAPACITY : 6.3(KW) SHF : 0.64 INPUT : 2410(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.17 2.84 0.46 2362 5.67 2.61 0.46 2506 5.45 2.51 0.46 2555...
  • Page 22 PERFORMANCE DATA COOL operation MSH-A30WV - : MUH-A30WV - (230V) CAPACITY : 8.5(KW) SHF : 0.62 INPUT : 3260(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 9.99 4.39 0.44 2608 9.56 4.21 0.44 2738...
  • Page 23 PERFORMANCE DATA COOL operation MSH-A30WV - : MUH-A30WV - (230V) CAPACITY : 8.5(KW) SHF : 0.62 INPUT : 3260(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 8.33 3.67 0.44 3195 7.65 3.37 0.44 3390 7.35 3.24 0.44 3456...
  • Page 24 PERFORMANCE DATA HEAT operation MSH-A18WV - : MUH-A18WV - (230V) CAPACITY : 5.2(KW) INPUT : 1610(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.28 1047 3.95 1256 4.63 1417 5.30 1530 5.98 1626 6.60 1674 7.28 1707 3.12...

  • Page 25: Microprocessor Control

    <MUH-A18/A24WV> 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. (MUH-A18WV)Outdoor fan OFF : 52°C Outdoor fan ON : 48°C Outdoor fan (MUH-A24WV)Outdoor fan OFF : 58°C High pressure protection Outdoor fan ON : 55°C...
  • Page 26 NOTE : During high pressure protection and for 4 minutes and 15 seconds after high pressure protection, defrosting of outdoor heat exchanger is not detected by the defrost thermistor RT61. <MUH-A30WV> During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor RT12 for excess rise protection of compressor discharge pressure.
  • Page 27 5. R.V. coil control Heating · · · · · ON Cooling · · · · · OFF Dry · · · · · · · · OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. (HEAT) (COOL / DRY) 5 sec.
  • Page 28 (1) LEV opening correction by discharge temperature The LEV opening is corrected according to the temperature difference between target discharge temperature (Tb) and actual discharge temperature (Ta). 1 The LEV correction is used properly for two kinds according to the LEV opening status at operation off. Opening immediately before having stopped last time Rank 100 pulse or less...

  • Page 29: Service Functions

    10-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JPDS and JPSG(MUH-A18WV)/ JPG1 and R871(MUH-A24/A30WV) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 37 or 38.) Defrost thermistor RT61 must read below -3°C.
  • Page 30 Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit lamp on the indoor unit is Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller. normally. operate. Outdoor unit Unit doesn't Indoor unit Outdoor unit Indoor unit...
  • Page 31 INNER MAIN Color of Normal Abnormal PROTECTOR 145i 8: OPEN lead wire MUH-A18WV MUH-A24WV MUH-A30WV AUX.1 AUX.2 ( 88i15: CLOSE WHT – BLK 102 " ~ 126 " 55 " ~ 68 " 55.4 " ~ 67.7 " Open or –...
  • Page 32 Compressor and/or outdoor fan motor doesn’t operate. A A Check of outdoor unit MUH-A18WV Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. Compressor Rectify the indoor and doesn't operate.
  • Page 33 MUH-A24WV MUH-A30WV Turn ON the power supply. Is there 230V AC to Check the outdoor power supply between on the and connection of wiring. outdoor terminal block Compressor does not operate. Is there 5V DC between Is there 230V AC between Rectify the connecting J101 - J401...
  • Page 34 Compressor and/or outdoor fan motor doesn’t stop. B B Check of outdoor unit MUH-A18WV 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 35: How To Check Mis-Wiring

    Check the outdoor power supply and connection of wiring. on the outdoor terminal block? Is there 5V DC between J205 + -J101 - (MUH-A18WV)/J101 + -J401 - (MUH-A24/A30 WV) on the deicer P.C. board?(Refer to page 37 or 38.) During EMERGENCY OPERATION, is there 10V DC between both ends of R601on the Replace the deicer P.C.

  • Page 36: Check Of Lev (Expansion Valve)

    When OPERATION INDICATOR lamp flashes 10-time. Heating/ Cooling doesn't operate. Check of LEV (Expansion valve) MUH-A30WV 1 During pressing OPERATION SELECT button on remote controller, press RESET button. 2 First, release RESET button. 1 During pressing OPERATION SELECT (Confirm all displays of remote controller.) button on remote controller, press 3 Then release OPERATION SELECT button.
  • Page 37 MUH-A18WV - 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 5~10V DC Defrost interval time short pin (JPDS, JPSG) (Refer to page 29.)
  • Page 38 MUH-A24WV - MUH-A30WV - Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) Discharge temperature thermistor(RT62) -20 -10 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) Temperature(:) CN661 1-2 <MUH-A30WV>...

  • Page 39: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MUH-A18WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the down of the cabinet on the both side and remove the cabinet.
  • Page 40 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) Photo 4 Set screws of the (2) Remove the propeller nut and the propeller. outdoor fan motor Propeller NOTE : Loose the propeller in the rotating direction for Lead clamps removal.
  • Page 41 12-2. MUH-A24WV - MUH-A30WV - NOTE : These photos are MUH-A30WV. OUTDOOR UNIT MUH-A24WV is almost the same as MUH-A30WV. OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 Screw of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel.
  • Page 42 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor Photo 5 (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE : Loose the propeller in the rotating direction for Set screws of the removal.

  • Page 43: Parts List

    PARTS LIST MUH-A18WV - 13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS DEFROST THERMISTOR Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name in Wiring Remarks MUH-A18WV- Diagram E02 817 233...
  • Page 44 MUH-A24WV - 13-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 45 MUH-A24WV - 13-2. 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 No. Part Name MUH-A24WV - Diagram E02 819 297 TOP PANEL E02 821 630 OUTDOOR HEAT EXCHANGER E02 821 301...
  • Page 46 MUH-A30WV - 13-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 47 MUH-A30WV - 13-3. OUTDOOR UNIT STRUCTURAL PARTS, 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-A30WV - Diagram TOP PANEL E02 819 297 E02 819 309 THERMISTOR RT62, RT63...
  • Page 48 E02 444 705 DRAIN CAP E02 444 706 DRAIN CAP 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 Nov. 2003. No.OB322 6 New publication, effective Nov. 2003 Made in Japan...

This manual is also suitable for:

Muh-a24wvMuh-a30wv

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