Table of Contents
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SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MU-A18WV -
MU-A24WV -
MU-A30WV -
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MS-A18WV-
OB325.
E1
E1
E1
Indication of model name
MU-A18WV -
E1
, MS-A24WV-
and MS-A30WV-
E1
E1
Revision A:
Resistance of LEV (Expansion valve) has been
modified.
Power input and others have been added to
SPECIFICATION.
Please void OB326.
HFC
utilized
R410A
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
4. NOISE CRITERIA CURVES ·······························7
5. OUTLINES AND DIMENSIONS ·························8
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ······························14
9. MICROPROCESSOR CONTROL ····················22
10. TROUBLESHOOTING······································25
11. DISASSEMBLY INSTRUCTIONS·····················32
12. PARTS LIST······················································38
, refer to the service manual
E1
No. OB326
REVISED EDITION-A
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Related Manuals for Mitsubishi Electric MU-A18WV-E1
Summary of Contents for Mitsubishi Electric MU-A18WV-E1
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Page 1: Table Of Contents
Revision A: Resistance of LEV (Expansion valve) has been modified. SPLIT-TYPE, AIR CONDITIONERS Power input and others have been added to SPECIFICATION. Please void OB326. No. OB326 REVISED EDITION-A utilized SERVICE MANUAL R410A Wireless type Models MU-A18WV - MU-A24WV - MU-A30WV - CONTENTS 1. -
Page 2: Specification·················································5
Revision A: •Resistance of LEV (Expansion valve) has been modified. (30.3 " ~ 37.0 " 41.0 " ~ 49.0 ") TROUBLESHOOTING has been partially modified. •Running current, power input and power factor have been added. SPECIFICATION has been partially modified. TECHNICAL CHANGES MU-18RV - MU-A18WV -... -
Page 3: High
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 0.8 mm 6.35 For liquid Heat resisting foam plastic 0.8 mm 9.52 Specific gravity 0.045 Thickness 8 mm 0.8 mm 12.7 For gas 1.0 mm...
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Page 5: High
PART NAMES AND FUNCTIONS OUTDOOR UNIT MU-A18WV - MU-A30WV - MU-A24WV - Air inlet Air inlet (back and side) (back and side) Piping Drainage hose Air outlet Air outlet Drain outlet SPECIFICATION Outdoor model MU-A18WV - MU-A24WV - Function Cooling Cooling Single phase Single phase... - Page 6 Outdoor model MU-A30WV - Function Cooling Single phase Power supply 230V, 50Hz Capacity Dehumidification Air flow(High/Low ) K /h 2,940/1,470 Power outlet Running current 14.42 Power input 3,191 Power factor Starting current Compressor motor current 13.85 Fan motor current 0.57 Coefficient of performance(C.O.P) 2.61 Model...
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Page 7: Hearing For
NOISE CRITERIA CURVES MU-A18WV- MU-A24WV- FAN SPEED SPL(dB(A)) LINE FAN SPEED 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: NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40... -
Page 8: Mu-A30Wv- E1
OUTLINES AND DIMENSIONS MU-A18WV- MU-A24WV- 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 (MU-A18WV) [15.88 (MU-A24WV) MU-A30WV- Open as a rule... -
Page 9: Wiring Diagram
WIRING DIAGRAM MU-A18WV - MODEL WIRING DIAGRAM OUTDOOR UNIT INDOOR UNIT CONNECTING DSAR CIRCUIT BREAKER POWER SUPPLY 230V 50Hz GRN/YLW SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR COMPRESOR (INNER PROTECTOR) COMPRESSOR CONTACTOR OUTDOOR FAN CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) DSAR SURGE ABSORBER TB1,TB2... -
Page 10: Outdoor Unit
MU-A30WV - MODEL WIRING DIAGRAM OUTDOOR UNIT RT62 RT63 CIRCUIT BREAKER CN711 CN662 CN724 1 2 3 SR62 SR61 TAB52 CN730 DEICER NR61 P. C. BOARD SYMBOL SYMBOL NAME SYMBOL NAME NAME CZ SURGE ABSRBER COMPRESSOR (INNER PROTECTOR) SR62 SOLID STATE RELAY COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK... -
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MU-A18WV - Unit:mm OUTDOOR UNIT Oil separator Refrigerant pipe [12.7 Capillary tube (with heat insulator) [2.5o[0.6o1,000 Stop valve (with service Outdoor heat port) Flared connection exchanger Strainer #100 Compressor Flared connection Stop valve Capillary tube [3.0o[1.6o600 Refrigerant pipe[6.35 (with heat insulator) Refrigerant flow in cooling MU-A24WV -... - Page 12 MU-A30WV - Unit:mm OUTDOOR UNIT Refrigerant pipe [15.88 (with heat insulator) Muffler Stop valve (with service port) Outdoor Discharge heat Flared connection temperature exchanger thermistor RT62 Muffler Ambient Compressor temperature Capillary tube thermistor [4.0 [2.4 200 RT63 (Upper path) Capillary tube Flared connection [4.0 [2.4 100 (Lower path)
- Page 13 ADDITIONAL REFRIGERANT CHARGE(R410A : g) Refrigerant piping length (one way) Outdoor unit precharged Model 1,400 MU-A18WV - Calculation : Xg=20g/m (Refrigerant piping length (m)–7) Refrigerant piping length (one way) Outdoor unit precharged Model 1,900 MU-A24WV - Calculation : Xg=20g/m (Refrigerant piping length (m)–7) Refrigerant piping length (one way) Outdoor unit Model...
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Page 14: Performance Curves
PERFORMANCE CURVES MU-A18WV - MU-A24WV - MU-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 15 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]) MU-A18WV - MU-A18WV - 230V 230V...
- Page 16 PERFORMANCE DATA COOL operation MS-A18WV - : MU-A18WV - (230V) CAPACITY : 5.0(KW) SHF : 0.65 INPUT : 1810(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 1448 5.63 2.64 0.47 1520...
- Page 17 PERFORMANCE DATA COOL operation MS-A18WV - : MU-A18WV - (230V) CAPACITY : 5.0(KW) SHF : 0.65 INPUT : 1810(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.30 0.47 1774 4.50 2.12 0.47 1882 4.33 2.03 0.47 1919...
- Page 18 PERFORMANCE DATA COOL operation MS-A24WV - : MU-A24WV - (230V) CAPACITY : 6.5(KW) SHF : 0.63 INPUT : 2480(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 7.64 3.44 0.45 1984 7.31 3.29 0.45 2083...
- Page 19 PERFORMANCE DATA COOL operation MS-A24WV - : MU-A24WV - (230V) CAPACITY : 6.5(KW) SHF : 0.63 INPUT : 2480(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.37 2.87 0.45 2430 5.85 2.63 0.45 2579 5.62 2.53 0.45 2629...
- Page 20 PERFORMANCE DATA COOL operation MS-A30WV - : MU-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 21 PERFORMANCE DATA COOL operation MS-A30WV - : MU-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...
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Page 22: Microprocessor Control
MICROPROCESSOR CONTROL MU-A30WV - 9-1. “I FEEL CONTROL” ( ) OPERATION 9-1-1. COOL mode of “I FEEL CONTROL” 1. Outdoor fan speed control <MU-A30WV> Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT63. Outdoor fan Low operation : When the outside temperature decreases to 20°C or less. Until the outside temperature goes to 22°C. - Page 23 9-2. LEV control <MU-A30WV> LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse 30 ~ 90 pulse / second Drive speed Opening set The setting is always in opening direction. (To close the LEV, it is closed to the pulse smaller than the one which is set finally.
- Page 24 2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is changed.
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Page 25: Troubleshooting
TROUBLESHOOTING MU-A18WV - MU-A24WV - MU-A30WV - 10-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: (1) Check the power supply voltage. (2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. (1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. -
Page 26: Outdoor Unit
Start Indoor unit Indoor unit Indoor unit operates. operates. OPERATION INDICATOR doesn't receive Outdoor unit Outdoor unit lamp on the indoor unit is the signal from doesn't doesn't operate flashing on and off. remote controller. operate. normally. Outdoor unit Indoor unit Outdoor unit Indoor unit doesn't... - Page 27 10-2. Trouble criterion of main parts MU-A18WV - MU-A24WV - MU-A30WV - Part name Check method and criterion Figure Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Discharge temperature (Part temperature 0˚C ~ 40˚C) thermistor(RT62) Normal Abnormal...
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Page 28: Outdoor Unit
Compressor and/or outdoor fan motor doesn’t operate. Check of outdoor unit MU-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... -
Page 29: Outdoor Unit
Compressor and/or outdoor fan motor doesn’t stop. Check of outdoor unit MU-A30WV 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again. -
Page 30: Check Of Lev (Expansion Valve)
When OPERATION INDICATOR lamp flashes 10-time. Cooling doesn't operate. Check of LEV (Expansion valve) MU-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 31 MU-A30WV - Outdoor deicer P.C. board 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(:) CN662 1-2 CN662 3-4 Fan motor Discharge temper- Ambient temperature connector...
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Page 32: 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 33 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Hook Photo 4 (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hooked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove screws fixing the outdoor fan motor.
- Page 34 11-2. MU-A24WV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Screws Service panel Photo 2 Screws 2.
- Page 35 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Photo 4 Hook (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hocked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove the screws fixing the fan motor.
- Page 36 11-3. MU-A30WV - OUTDOOR UNIT 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. (3) Remove the screw of the valve cover. (4) Remove the service panel.
- Page 37 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.
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Page 38: Parts List
PARTS LIST MU-A18WV - MU-A24WV - 12-1. 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 No. Part Name Remarks MU-A18WV- MU-A24WV- Diagram E02 817 233 BACK PANEL E02 817 232 CABINET... - Page 39 MU-A30WV - 12-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 10 11 Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Remarks Part No. Part Name in Wiring MU-A30WV - Diagram TOP PANEL E02 819 297 E02 819 630 OUTDOOR HEAT EXCHANGER E02 819 301...
- Page 40 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.OB326 REVISED EDITION-A 6 New publication, effective Feb. 2004 Distributed in Dec. 2003. No.OB326 6 Specifications subject to change without notice.