Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MSH-A18ND -
MSH-A24ND -
MSH-A18ND
MSH-A24ND
NOTE:
This service manual describes technical data of the indoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS PARTS LIST (RoHS compliant).
•Remote controller model has been changed.
•RoHS PARTS LIST has been added.
Please void OB427 REVISED EDITION-A.
S1
S1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. OUTLINES AND DIMENSIONS ·························5
5. WIRING DIAGRAM ············································6
6. REFRIGERANT SYSTEM DIAGRAM ················7
7. SERVICE FUNCTIONS ······································8
8. TROUBLESHOOTING······································10
9. DISASSEMBLY INSTRUCTIONS ····················18
10. PARTS LIST······················································20
11. RoHS PARTS LIST···········································23
No. OB427
REVISED EDITION-B
Outdoor unit service manual
MUH-A·ND Series (OB428)
TM
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSH-A18ND
Summary of Contents for Mitsubishi Electric MSH-A18ND
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB427 REVISED EDITION-A. INDOOR UNIT No. OB427 SERVICE MANUAL REVISED EDITION-B Wireless type Models MSH-A18ND - MSH-A24ND - Outdoor unit service manual MUH-A·ND Series (OB428) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4. -
Page 2: Technical Changes
KM04A) Both remote controllers can be used as alternative. •RoHS PARTS LIST has been added. TECHNICAL CHANGES MSH-18TN - MSH-A18ND - MSH-24TN - MSH-A24ND - 1. Model name has been changed. 2. Grille design has been changed. 3. Unit size has been changed.(W 1,015a o H 320a o D 190a W 1,100a o H 325a o D 258a) 4. - Page 3 REMOTE CONTROLLER MSH-A18ND MSH-A24ND Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back. Open the front lid. CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button...
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Page 4: Specification
SPECIFICATION Indoor model MSH-A18ND MSH-A24ND Function Heating Cooling Heating Cooling Single phase Single phase Power supply 220V, 60Hz 220V, 60Hz Capacity Air flow (High/Med./Low) K /h 768/642/516 954/822/684 954/834/726 Running current 0.28 0.37 Power input Power factor Model RC4N32-AA RC4V40-AA Current 0.28... -
Page 5: Outlines And Dimensions
Liquid line [ 6.35- 0.5m 1100 Air in Installation plate Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D for MSH-A18ND Liquid line [ 9.52- 0.5m Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D for MSH-A24ND Drain hose [16 (Connected part O.D) -
Page 6: Wiring Diagram
WIRING DIAGRAM MSH-A18ND INDOOR UNIT RT12 TO OUTDOOR HIC1 RT11 UNIT CONNECTING CN201 NR11 SR141 TAB12 220V~ CN211 ELECTRONIC CONTROL P.C. BOARD MV2 MV2 MV1 DISPLAY RECEIVER P.C.BOARD P.C.BOARD REMOTE CONTROLLER SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR FAN CAPACITOR... -
Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSH-A18ND MSH-A24ND Unit:mm INDOOR UNIT INDOOR UNIT Refrigerant pipe [15.88 Refrigerant pipe [12.7 (with heat insulator) (with heat insulator) Indoor coil Indoor coil thermistor Indoor Indoor thermistor RT12(main) heat RT12 heat exchanger exchanger Distributor Distributor Flared connection... -
Page 8: Service Functions
SERVICE FUNCTIONS MSH-A18ND MSH-A24ND 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. Set time : 1 minute... - Page 9 How to release “AUTO RESTART FUNCTION” Turn off the main power for the unit. Pull out the electronic control P.C. board, the receiver P.C. board and the display P.C.board. (Refer to 9-2.) Solder jumper wire to JR07 on the indoor electronic control P.C.
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Page 10: Troubleshooting
TROUBLESHOOTING MSH-A18ND MSH-A24ND 8-1. 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 of 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 11 8-2. Instruction of troubleshooting 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.
- Page 12 8-3. Troubleshooting check table • The following indication applies regardless of shape of the indicator. • Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C.
- Page 13 8-4. Trouble criterion of main parts MSH-A18ND MSH-A24ND Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature (Part temperature 10˚C ~ 30˚C) thermistor (RT11) Normal Indoor coil thermistor (RT12(main), RT13(sub)) 8 k" ~ 20 k"...
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Page 14: Troubleshooting Flow
8-5. Troubleshooting flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Is soldered point of the connector Are lead wires connected? Resolder it. correctly soldered? Reconnect the lead wires. -
Page 15: Check Of Indoor Electronic Control P.c. Board
The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by press- ing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side” of indoor electronic control P.C. board visually. -
Page 16: How To Check Mis-Wiring
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. 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. Start •... - Page 17 8-6. Test point diagram and voltage MSH-A18ND MSH-A24ND Indoor electronic control P.C. board Fan motor power supply Power supply input 220V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature ther- mistor(RT11) Indoor coil thermistor(RT12(main)) PS132 MSH-A24ND Indoor coil...
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Page 18: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSH-A18ND MSH-A24ND INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. Front panel Remove the screws. - Page 19 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic Screw of the...
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Page 20: Parts List
10-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-A18ND - MSH-A24ND - Diagram E02 527 970 INSTALLATION PLATE E02 685 234 E02 888 000 FRONT PANEL ASSEMBLY Including No.4,5,6... -
Page 21: Electrical Parts
10-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-A18ND - MSH-A24ND - Diagram E02 527 302 LINE FLOW FAN E02 408 509 BEARING MOUNT E02 001 504... - Page 22 Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSH-A18ND MAC-1700FT MSH-A24ND Air cleaning filter (White bellows type)
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Page 23: Rohs Parts List
11-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-A18ND - MSH-A24ND - Diagram E12 527 970 INSTALLATION PLATE E12 685 234 E12 888 000 FRONT PANEL ASSEMBLY Including No.4,5,6... - Page 24 11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-A18ND - MSH-A24ND - Diagram E12 527 302 LINE FLOW FAN E12 408 509 BEARING MOUNT E12 001 504...
- Page 25 Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSH-A18ND MAC-1700FT MSH-A24ND Air cleaning filter (White bellows type)
- Page 28 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2007. No.OB427 REVISED EDITION-B 6 Distributed in Feb. 2006. No.OB427 REVISED EDITION-A 106 New publication, effective May 2007 Distributed in Nov. 2005. No.OB427 106 Specifications subject to change without notice.