Service manual

ManualsBrandsMitsubishi ManualsDomestic AppliancesMSH-A18ND

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················3

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

4. OUTLINES AND DIMENSIONS ·························4

5. WIRING DIAGRAM ············································6

6. REFRIGERANT SYSTEM DIAGRAM ················8

7. PERFORMANCE CURVES······························10

8. TROUBLESHOOTING······································12

9. DISASSEMBLY INSTRUCTIONS ····················21

10. PARTS LIST······················································27

11. RoHS PARTS LIST···········································30

SPLIT-TYPE AIR CONDITIONERS

MU-A18ND

MU-A18ND-

MU-A24ND-

MU-A30ND-

Indoor unit service manual

MS-A• ND Series (OB404)

No. OB405

REVISED EDITION-E

SERVICE MANUAL

Models

OUTDOOR UNIT

NOTE:

• This service manual describes technical data of the outdoor units.

• RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the RoHS Parts List.

Please void OB405 REVISED EDITION-D.

Revision E:

• SPECIFICATION has been modified.

OB405E.qxp 09.10.14 9:16 AM Page 1

Summary of content (36 pages)

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OB405E.qxp 09.10.14 9:16 AM Page 1 Revision E: • SPECIFICATION has been modified. Please void OB405 REVISED EDITION-D. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL No. OB405 REVISED EDITION-E Models MU-A18NDMU-A18NDMU-A24NDMU-A24NDMU-A30NDMU-A30ND- S1 S2 S1 S2 S1 S2 Indoor unit service manual MS-A• ND Series (OB404) CONTENTS MU-A18ND 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3.
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OB405E.qxp 09.10.14 9:16 AM Page 2 Revision A: • Check of solenoid valve coil has been partially modified. Revision B: • MU-A24ND - S2 has been added. Revision C: • MU-A18ND - S2 has been added. Revision D: • MU-A30ND - S2 has been added. Revision E: • SPECIFICATION has been modified. 1 TECHNICAL CHANGES w : change Frequency New Model Old Model Compressor: NH30VCD ➞ RH247NRAT Compressor: RH277NHD ➞ RH247NRAT Electricity receiving unit: Indoor unit ➞ Outdoor unit Gas pipe diameter: [15.88 ➞ [12.
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09.10.
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09.10.14 9:16 AM 4 Page 4 OUTLINES AND DIMENSIONS REQUIRED SPACE MU-A18ND - S1 OUTDOOR UNIT 355 350 Air in Drainage hole [16.2 20 100mm or more OB405E.qxp Unit: mm ore m 00m or m 1 100 mm or m 345 Air in 310 290 248 90 35 ore re Drainage 3holes [33 Air out 50 m 0m 50 30 or mo 35 0m m Service panel or mo re 20 50 100 157 292 3035- 605 Liquid refrigerant pipe joint Refrigerant pipe (Flared) [6.35 183 Gas refrigerant pipe joint Refrigerant pipe (flared) [12.
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09.10.14 9:16 AM Page 5 MU-A24ND MU-A30ND OUTDOOR UNIT Open as a rule 500mm or more if the front and both sides are open REQUIRED SPACE 515 299 40 100mm or more 200mm or more if there are obstacles to both sides 51 34 66 360 330 100mm or more 500 840 121 80 Open as a rule 500mm or more if the back, both sides and top are open 350mm or more 30- 850 Service panel 155 90 35- 430 OB405E.qxp 198 5 Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35(MU-A24ND) [9.
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Page 6 WIRING DIAGRAM MU-A18ND OUTDOOR UNIT C2 RED WHT 4 3 2 1 2 220-230V~ ORN BLU N 220-230V~ BLU L RED ORANGE WHITE BLACK MF BRN TB1 F DSAR POWER SUPPLY 220-230V ~/N 60Hz TO INDOOR UNIT CONNECTING WHT TB2 L BLU 5 09.10.14 9:16 AM BRN OB405E.qxp C C1 BLU N RED MC S GRN/YLW BLK NAME SYMBOL NAME NAME SYMBOL SYMBOL TERMINAL BLOCK COMPRESSOR CAPACITOR FUSE (3.
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09.10.14 9:16 AM Page 7 MU-A24ND- S2 BRN TB1 1 BRN 52C C1 BLU N 4 S RED 220-230V~ BLU F GRN/YLW 2 BLU WHT ORN RED TB2 3 WHT MF 2 ORN RED C2 WHT N BLU 220-230V~ R 4 BLK 1 C MC BLK PE WHT POWER SUPPLY ~/N 220-230V 60Hz L BLU TO INDOOR UNIT CONNECTING OUTDOOR UNIT 5 BRN L 6 52C DSAR NAME SYMBOL SYMBOL NAME NAME SYMBOL TERMINAL BLOCK COMPRESSOR CAPACITOR C1 F TB1 FUSE(3.
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OB405E.qxp 6 09.10.14 9:16 AM Page 8 REFRIGERANT SYSTEM DIAGRAM MU-A18ND Unit : mm OUTDOOR UNIT Refrigerant pipe {12.7 (with heat insulator) Stop Valve (with service port) Outdoor heat exchanger Compressor Strainer #100 Flared connection Capillary tube [3.0 x [1.8 x 400 Stop Valve Refrigerant pipe {6.35 (with heat insulator) MU-A24ND OUTDOOR UNIT Refrigerant pipe [15.
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OB405E.qxp 09.10.15 1:32 PM Page 9 MU-A30ND Unit : mm OUTDOOR UNIT Refrigerant pipe [15.88 (with heat insulator) Strainer #100 Stop valve (with service port) Outdoor heat exchanger Discharge temperature thermistor RT62 Flared connection Accumulator Compressor Capillary tube [4.0 x [2.4 x 200 Solenoid valve [4.2 x [3.0 x 50 Flared connection LEV (Expansion valve) Stop valve Refrigerant pipe [9.52 (with heat insulator) Ambient temperature thermistor RT63 Capillary tube [4.0 x [2.
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OB405E.qxp 7 09.10.14 9:16 AM Page 10 PERFORMANCE CURVES MU-A18ND MU-A24ND MU-A30ND 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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09.10.14 9:16 AM Page 11 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation ① Both indoor and outdoor units are under the same temperature/humidity condition. Dry-bulb temperature (:) Relative humidity (%) 20 50 25 60 30 70 ➁ 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 8.0 0.8 7.0 0.7 6.0 0.6 5.0 0.5 4.0 0.4 3.0 0.
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OB405E.qxp 09.10.14 9:16 AM 6.0 0.6 5.0 0.5 4.0 0.4 3.0 0.3 MU-A30ND MU-A30ND 15.0 Outdoor unit current(A) Outdoor low pressure (kgf/F[Gauge])(MPa[Gauge]) Page 12 14.0 13.0 12.0 11.0 10.0 0.2 15 2.0 18 20 50 25 60 30 32 70 9.0 15 35(:) (%) Ambient temperature (˚C)/Ambient humidity (%) 8 18 20 50 25 60 30 32 70 35(:) (%) Ambient temperature (˚C)/Ambient humidity (%) TROUBLESHOOTING MU-A18ND MU-A24ND MU-A30ND 8-1. Cautions on troubleshooting 1.
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OB405E.qxp 09.10.14 9:16 AM Page 13 8-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit dose not operate. Outdoor unit operates in only Test Run operation. w Check room temperature thermistor. Refer to "Test point diagram and voltage". MU-A30ND Outdoor unit dose not operate even in Test Run operation. w Refer to 8-4. A "Check of outdoor unit". MS-A30ND Flash on and off at 0.
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OB405E.qxp 09.10.14 9:16 AM Page 14 8-3. Trouble criterion of main parts MU-A18ND MU-A24ND MU-A30ND Part name Discharge temperature thermistor(RT62) MU-A30ND Check method and criterion Figure Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. (Part temperature 0˚C ~ 40˚C) Refer to 8-5. "Test point diagram and voltage", "Outdoor deicer P.C. board", the chart of thermistor. Measure the resistance with a tester.
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OB405E.qxp 09.10.14 9:16 AM Page 15 8-4. Troubleshooting flow Compressor and / or outdoor fan motor dose not operate. A Check of outdoor unit MU-A30ND Turn ON the power supply. Is there 220-230V AC to between L-N on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Compressor dose not operate. Check the deicer P.C. board. Refer to 8-5. Is there 5V DC? Yes Press the EMERGENCY OPERATION switch. 3-minute time delay works.
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OB405E.qxp 09.10.14 9:16 AM Page 16 Compressor and / or outdoor fan motor dose not stop. B Check of outdoor unit MU-A24ND - S2 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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OB405E.qxp 09.10.14 9:16 AM Page 17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit dose not operate. C How to check mis-wiring w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. MU-A30ND Start • Turn ON the power supply. • Press EMERGENCY OPERATION switch once. When the unit has mis-wiring, in 3 minutes, OPERATION INDICATOR lamp on indoor unit flash on and off at 0.5 second intervals.
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OB405E.qxp 09.10.14 9:16 AM Page 18 When OPERATION INDICATOR lamp flashes 10-time. Cooling mode dose not operate. D Check of LEV (Expansion valve) Remote controller model : KP0B Turn ON the power supply. 1 While pressing OPERATION SELECT button on the remote controller, press RESET button. 2 Release RESET button to confirm if all LCD in operation display section of the remote controller is displayed. 3 Release OPERATION SELECT button. MU-A30ND Remote controller model : KM04B Turn ON the power supply.
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OB405E.qxp 09.10.14 9:16 AM Page 19 F Check of solenoid valve coil MU-A30ND Outdoor unit repeats start and stop. Turn ON the power supply. Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. After 1minute or more has passed since the compressor started, operate the solenoid valve coil by heating or cooling the ambient temperature thermistor. (Refer to Solenoid valve control.) Do you hear "click" from the solenoid valve coil? Yes No Turn ON the solenoid valve coil.
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OB405E.qxp 09.10.14 9:16 AM Page 20 8-5. Test point diagram and voltage MU-A30ND 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 8-4.E.
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OB405E.qxp 09.10.14 9:16 AM 9 Page 21 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not.
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OB405E.qxp 09.10.14 9:16 AM Page 22 PHOTOS OPERATING PROCEDURE 2. Removing the electrical parts Photo 3 (1) Remove the service panel and the cabinet. (2) Remove the following parts. •Compressor capacitor (C1) •Outdoor fan capacitor (C2) •Terminal blocks (TB1,TB2) Outdoor fan capacitor(C2) Compressor capacitor(C1) Photo 4 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector remove the hooked lead wire from the fan motor.
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OB405E.qxp 09.10.14 9:16 AM Page 23 9-2. MU-A24ND OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 (1) Remove the screw 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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OB405E.qxp 09.10.14 9:16 AM Page 24 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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OB405E.qxp 09.10.14 9:16 AM Page 25 9-3. MU-A30ND OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 (1) Remove the screw 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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OB405E.qxp 09.10.14 9:16 AM Page 26 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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OB405E.qxp 09.10.14 9:16 AM 10 Page 27 PARTS LIST (non-RoHS compliant) MU-A18ND 10-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 19 20 18 1 17 16 15 14 2 13 12 3 11 10 4 5 6 7 8 9 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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OB405E.qxp 09.10.14 9:16 AM Page 28 PARTS LIST (non-RoHS compliant) MU-A24ND MU-A30ND 10-2.
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OB405E.qxp 09.10.14 9:16 AM Page 29 PARTS LIST (non-RoHS compliant) MU-A24ND MU-A30ND 10-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 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 34 35 36 Part No.
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OB405E.qxp 11 09.10.14 9:16 AM Page 30 RoHS PARTS LIST (RoHS compliant) MU-A18ND 11-1.
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09.10.14 9:16 AM Page 31 RoHS PARTS LIST (RoHS compliant) MU-A18ND 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 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 RoHS OB405E.qxp G G G G G G G G G G G G G G G G G G G G G G G G G G Part No.
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OB405E.qxp 09.10.14 9:16 AM Page 32 RoHS PARTS LIST (RoHS compliant) MU-A24ND MU-A30ND 11-2.
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09.10.14 9:16 AM Page 33 RoHS PARTS LIST (RoHS compliant) MU-A24ND MU-A30ND 11-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. RoHS OB405E.qxp 1 G G 2 G G 3 G 4 G 5 G G 6 G 7 G 8 G 9 G 10 G G 11 G 12 G G 13 G 14 G 15 G 16 G 17 G 18 G G 19 G 20 G 21 G G 22 G G 23 G G 24 G 25 G 26 G 27 G 28 G 29 G 30 G 31 G G 32 G G G 33 G G G 34 G G 35 G 36 G Part No.
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OB405E.qxp 09.10.14 9:16 AM Page 36 TM HEAD OFFICE: TOKYO BLDG, 2-7-3, MARUNOUCHI, CHIYODAKU, TOKYO 100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Oct. 2009. No.OB405 REVISED EDITION-E 5 Distributed in May 2006. No.OB405 REVISED EDITION-D 106 Distributed in Nov. 2005. No.OB405 REVISED EDITION-C 106 Distributed in Jun. 2005. No.OB405 REVISED EDITION-B 106 Distributed in May 2005. No.OB405 REVISED EDITION-A 106 Reprinted in Apr. 2005. No.