Service manual

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················5

3. SPECIFICATION·················································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

Wireless type

Models

MU-A18WV -

MU-A24WV -

MU-A30WV -

SPLIT-TYPE, AIR CONDITIONERS

MU-A18WV -

Indication of model name

NOTE:

•This service manual describes technical data of outdoor units.

As for indoor units MS-A18WV- , MS-A24WV- and MS-A30WV- , refer to the service manual

OB325.

E1E1E1

No. OB326

REVISED EDITION-A

Revision A:

● Resistance of LEV (Expansion valve) has been

modified.

● Power input and others have been added to

SPECIFICATION.

HFC

utilized

R410A

Please void OB326.

OB326A-1.qxp 04.2.9 10:41 AM Page 1

Summary of content (40 pages)

PAGE 1
OB326A-1.qxp 04.2.9 10:41 AM Page 1 Revision A: ● Resistance of LEV (Expansion valve) has been modified. ● Power input and others have been added to SPECIFICATION. SPLIT-TYPE, AIR CONDITIONERS Please void OB326. HFC utilized SERVICE MANUAL No. OB326 REVISED EDITION-A R410A Wireless type Models MU-A18WV MU-A24WV MU-A30WV - E1 E1 E1 CONTENTS Indication of model name MU-A18WV - E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3.
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OB326A-1.qxp 04.2.9 10:41 AM Page 2 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. 1 TECHNICAL CHANGES MU-18RV - E1 ➔MU-A18WV - E1 MU-24RV - E1 ➔MU-A24WV - E1 1. Refrigerant has changed. (R22➔R410A) 2. Refrigerant system diagram has changed. • Diameter of stop valve has changed. (Gas: [15.88➔[12.
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OB326A-1.qxp 04.2.9 10:41 AM Page 3 Compressor 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. refrigerating oil of the upper layer to flow back to the compressor.
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OB326A-1.qxp 04.2.9 10:41 AM Page 4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Pipe For liquid For gas mm Wall thickness 6.35 0.8 mm 9.52 0.8 mm Heat resisting foam plastic 12.7 0.8 mm Specific gravity 0.045 Thickness 8 mm 15.88 1.0 mm Insulation material • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88).
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OB326A-1.qxp 04.2.
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OB326A-1.qxp 04.2.9 10:41 AM Page 6 Outdoor model Function MU-A30WV - E1 Cooling Single phase 230V, 50Hz 8.5 4.6 2,940/1,470 w 25 14.42 3,191 96 90 13.85 0.57 2.61 NN37VAAHT 2,500 C-R 0.64 C-S 1.63 RA6V75-AB WHT-BLK 62.8 BLK-YLW 55.9 YLW-RED 26.
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OB326A-1.qxp 04.2.
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OB326A-1.qxp 04.2.9 10:41 AM 5 Page 8 OUTLINES AND DIMENSIONS MU-A18WV- E1 MU-A24WV- E1 OUTDOOR UNIT 35 20 mor e m or 500m 50 Air out e mor m or m 0 0 1 345 Air in 310 290 248 90 100m m or Drainage 3holes [33 100mm or more 355 350 Air in Drainage hole [16.2 Unit: mm 30 more 350 mm or m ore Service panel 20 100 157 35- 292 30- 605 Liquid refrigerant pipe joint Refregerant pipe (flared) [6.35 183 161 500 850 Gas refregerant pipe joint Refregerant pipe (flared) [12.
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OB326A-1.qxp 04.2.
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OB326A-1.qxp 04.2.9 10:41 AM Page 10 MU-A30WV - E1 MODEL WIRING DIAGRAM 6 5 4 3 2 1 CIRCUIT BREAKER POWER SUPPLY ~/N 230V 50Hz L 1 2 3 CN724 C2 CN711 SR62 SR61 X52 N X52 TAB52 PE COM GRN/YLW TO INDOOR UNIT CONNECTING 12V SYMBOL TB1 RED ORN YLW BLK WHT 6 CN662 MF YLW BLK WHT ORN RED RT62 RT63 LEV DSAR BRN OUTDOOR UNIT T61 DEICER P. C.
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OB326A-1.qxp 04.2.9 10:41 AM 7 Page 11 REFRIGERANT SYSTEM DIAGRAM MU-A18WV - E1 OUTDOOR UNIT Unit:mm Oil separator Refrigerant pipe [12.7 (with heat insulator) Flared connection Capillary tube [2.5o[0.6o1,000 Stop valve (with service port) Strainer #100 Outdoor heat exchanger Compressor Flared connection Stop valve Capillary tube [3.0o[1.6o600 Refrigerant pipe[6.35 (with heat insulator) Refrigerant flow in cooling MU-A24WV - E1 OUTDOOR UNIT Refrigerant pipe [15.
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OB326A-1.qxp 04.2.9 10:41 AM Page 12 MU-A30WV - E1 OUTDOOR UNIT Unit:mm Refrigerant pipe [15.88 (with heat insulator) Muffler Stop valve (with service port) Outdoor heat exchanger Discharge temperature thermistor RT62 Flared connection Muffler Ambient temperature thermistor RT63 Capillary tube [4.0✕[2.4✕100 (Lower path) Compressor Capillary tube [4.0✕[2.4✕200 (Upper path) Flared connection LEV Strainer Stop valve Refrigerant pipe [9.52 (with heat insulator) Capillary tube [3.6✕[2.
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OB326A-1.qxp 04.2.
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OB326A-1.qxp 8 04.2.9 10:41 AM Page 14 PERFORMANCE CURVES MU-A18WV - E1 MU-A24WV - E1 MU-A30WV - E1 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 provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
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OB326A-1.qxp 04.2.9 10:41 AM Page 15 2 Air flow should be set at MAX. 3 The unit of pressure has been changed to MPa on the international system of units(SI unit system). f [Gauge]) The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/f MU-A18WV - E1 MU-A18WV - E1 9 12 1.2 11 1.1 10 1.0 9 0.9 8 0.8 7 0.7 15 Outdoor unit current (A) Outdoor low pressure (kgf/F[Gauge])(MPa[Gauge]) 230V 18 20 50 25 60 30 32 70(%) 230V 8 7 6 5 15 35(:) 10 1.0 9 0.9 8 0.8 7 0.7 6 0.
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OB326A-1.qxp 04.2.9 10:41 AM Page 16 PERFORMANCE DATA COOL operation MS-A18WV - E1 : MU-A18WV - E1 (230V) CAPACITY : 5.0(KW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 5.88 6.13 5.88 6.13 6.38 5.88 6.
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OB326A-1.qxp 04.2.9 10:41 AM Page 17 PERFORMANCE DATA COOL operation MS-A18WV - E1 : MU-A18WV - E1 (230V) CAPACITY : 5.0(KW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 4.90 5.15 4.90 5.15 5.45 4.90 5.
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OB326A-1.qxp 04.2.9 10:41 AM Page 18 PERFORMANCE DATA COOL operation MS-A24WV - E1 : MU-A24WV - E1 (230V) CAPACITY : 6.5(KW) SHF : 0.63 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 7.64 7.96 7.64 7.96 8.29 7.64 7.
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OB326A-1.qxp 04.2.9 10:41 AM Page 19 PERFORMANCE DATA COOL operation MS-A24WV - E1 : MU-A24WV - E1 (230V) CAPACITY : 6.5(KW) SHF : 0.63 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 6.37 6.70 6.37 6.70 7.09 6.37 6.
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OB326A-1.qxp 04.2.9 10:41 AM Page 20 PERFORMANCE DATA COOL operation MS-A30WV - E1 : MU-A30WV - E1 (230V) CAPACITY : 8.5(KW) SHF : 0.62 INDOOR INDOOR DB(:) WB(:) Q 21 18 9.99 21 20 10.41 22 18 9.99 22 20 10.41 22 22 10.84 23 18 9.99 23 20 10.41 23 22 10.84 24 18 9.99 24 20 10.41 24 22 10.84 24 24 11.39 25 18 9.99 25 20 10.41 25 22 10.84 25 24 11.39 26 18 9.99 26 20 10.41 26 22 10.84 26 24 11.39 26 26 11.73 27 18 9.99 27 20 10.41 27 22 10.84 27 24 11.39 27 26 11.73 28 18 9.99 28 20 10.41 28 22 10.
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OB326A-1.qxp 04.2.9 10:41 AM Page 21 PERFORMANCE DATA COOL operation MS-A30WV - E1 : MU-A30WV - E1 (230V) CAPACITY : 8.5(KW) SHF : 0.62 INDOOR INDOOR DB(:) WB(:) Q 21 18 8.33 21 20 8.76 22 18 8.33 22 20 8.76 22 22 9.27 23 18 8.33 23 20 8.76 23 22 9.27 24 18 8.33 24 20 8.76 24 22 9.27 24 24 9.78 25 18 8.33 25 20 8.76 25 22 9.27 25 24 9.78 26 18 8.33 26 20 8.76 26 22 9.27 26 24 9.78 26 26 10.29 27 18 8.33 27 20 8.76 27 22 9.27 27 24 9.78 27 26 10.29 28 18 8.33 28 20 8.76 28 22 9.27 28 24 9.78 28 26 10.
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OB326A-1.qxp 9 04.2.9 10:41 AM Page 22 MICROPROCESSOR CONTROL MU-A30WV - E1 9-1. “I FEEL CONTROL” ( ) OPERATION 9-1-1. COOL mode of “I FEEL CONTROL” 1. Outdoor fan speed control 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. Outdoor fan High operation : Until the outside temperature decreases to 20°C or less.
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OB326A-1.qxp 04.2.9 10:41 AM Page 23 9-2. LEV control General operation Basic specification LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse Drive speed 30 ~ 90 pulse / second 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. Then the LEV is opened to the final setting pulse.
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OB326A-1.qxp 04.2.9 10:41 AM 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. After the temperature is changed, when temperature difference RT is 3: or more, the target temperature is changed again.
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OB326A-1.qxp 04.2.9 10:41 AM 10 Page 25 TROUBLESHOOTING MU-A18WV - E1 MU-A24WV - E1 MU-A30WV - E1 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.
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OB326A-1.qxp 04.2.9 10:41 AM Page 26 Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage". Outdoor unit doesn't operate even in Test Run operation. MU-A30WV Refer to A "Check of outdoor unit" on page 28. Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit doesn't receive the signal from remote controller.
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OB326A-1.qxp 04.2.9 10:41 AM Page 27 10-2. Trouble criterion of main parts MU-A18WV - E1 MU-A24WV - E1 Part name Discharge temperature thermistor(RT62) MU-A30WV Ambient temperature thermistor(RT63) MU-A30WV Compressor (MC) INNER PROTECTOR 160i 5: OPEN 90i10: CLOSE MU-A30WV - E1 Check method and criterion Figure Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.
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OB326A-1.qxp 04.2.9 10:41 AM Page 28 Compressor and/or outdoor fan motor doesn’t operate. A Check of outdoor unit MU-A30WV Turn ON the power supply. Is there 230V AC to between L-N on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Compressor does not operate. Is there 5V DC between No J101 + - J401 on the deicer P.C. board? w Yes No Rectify the connecting wire. Replace the deicer P.C. board.
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OB326A-1.qxp 04.2.9 10:41 AM Page 29 Compressor and/or outdoor fan motor doesn’t stop. B 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.
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OB326A-1.qxp 04.2.9 10:41 AM Page 30 When OPERATION INDICATOR lamp flashes 10-time. Cooling doesn't operate. D 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. RESET button. 2 First, release RESET button.
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OB326A-2.qxp 04.2.9 10:42 AM Page 31 MU-A30WV - E1 Outdoor deicer P.C. board Ambient temperature thermistor (RT63) 100 Discharge temperature thermistor(RT62) 900 Resistance(k") 800 700 600 Resistance(k") 90 80 70 60 50 40 500 400 30 300 20 200 10 100 0 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) CN662 1-2 Discharge temperature thermistor (RT62) (Refer to page 30.) 0 -20 -10 0 10 20 30 40 Temperature(:) CN662 3-4 Ambient temperature thermistor (RT63) (Refer to page 30.
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OB326A-2.qxp 11 04.2.9 10:42 AM Page 32 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. (1) Slide the sleeve and check if there is a locking lever or not.
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OB326A-2.qxp 04.2.9 10:42 AM 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. (5) Remove the outdoor fan motor. Propeller nut Propeller 4. Removing the compressor (1) (2) (3) (4) (5) Remove the cabinet. (Refer to 1.) Remove the relay panel.
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OB326A-2.qxp 04.2.9 10:42 AM Page 34 11-2. MU-A24WV - E1 OUTDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Photo 1 Screws Service panel Photo 2 Screws 2. Removing the electrical parts Photo 3 (1) Remove the cabinet . (Refer to 1.) (2) Remove the following parts.
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OB326A-2.qxp 04.2.9 10:42 AM Page 35 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Photo 4 (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. (5) Remove the outdoor fan motor. Propeller 4. Removing the compressor (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the cabinet. (Refer to 1.) Remove the soundproof felt.
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OB326A-2.qxp 04.2.9 10:42 AM Page 36 11-3. MU-A30WV - E1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 (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. (5) Remove the top panel. (6) Remove the valve cover. (7) Remove the screws of the front panel. (8) Remove the front panel. (9) Remove the screws of the back panel. (10) Remove the back panel.
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OB326A-2.qxp 04.2.9 10:42 AM Page 37 PHOTOS OPERATING PROCEDURE 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE : Loose the propeller in the rotating direction for removal. When attaching the propeller, align the mark on the propeller and the motor shaft cut section. Set the propeller in position by using the cut on the shaft and the mark on the propeller.
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OB326A-2.qxp 12 04.2.9 10:42 AM Page 38 PARTS LIST MU-A18WV - E1 MU-A24WV - E1 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 20 19 1 17 18 16 15 14 13 12 2 11 3 10 9 4 5 6 7 8 Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Part No.
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OB326A-2.qxp 04.2.9 10:42 AM Page 39 MU-A30WV - E1 12-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 25 24 23 20 21 22 19 1 18 17 16 2 3 15 4 6 14 7 15 8 5 13 9 10 11 12 Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Part No.
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OB326A-2.qxp 04.2.9 10:42 AM Page 40 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Feb. 2004. No.OB326 REVISED EDITION-A 6 Distributed in Dec. 2003. No.OB326 6 Made in Japan New publication, effective Feb. 2004 Specifications subject to change without notice.