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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

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Outdoor unit service manual

MUH-A·ND Series (OB428)

MSH-A18ND
MSH-A24ND

Wireless type
Models

MSH-A18ND -
MSH-A24ND -

SERVICE MANUAL

INDOOR UNIT

No. OB427

REVISED EDITION-B

Please void OB427 REVISED EDITION-A.

Revision B:

•Remote controller model has been changed.
•RoHS PARTS LIST has been added.

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).

OB427B-1.qxp 07.5.16 3:30 PM Page 1

Содержание MSH-A18ND

Страница 1: ... Outdoor unit service manual MUH A ND Series OB428 MSH A18ND MSH A24ND TM Wireless type Models MSH A18ND MSH A24ND S1 S1 SERVICE MANUAL INDOOR UNIT No OB427 REVISED EDITION B Please void OB427 REVISED EDITION A Revision B Remote controller model has been changed RoHS PARTS LIST has been added NOTE This service manual describes technical data of the indoor units RoHS compliant products have G mark ...

Страница 2: ...anged 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 Electricity receiving unit has been changed from indoor unit to outdoor unit S1 S1 S1 S1 ACCESSORIES 1 2 3 4 5 6 7 8 Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 o 3 5 o 1 6 mm Black Battery AAA for remote controller Wireless remote controller Air c...

Страница 3: ...ront lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE button Horizontal vane button CLOCK SET button LONG button WIDE VANE button Vertical vane button Indication of remote controller model ...

Страница 4: ... KP0A KM04A Cooling Heating Cooling 954 822 684 1 280 1 130 970 Heating 954 834 726 1 280 1 150 1 020 Single phase 220V 60Hz 0 37 81 99 RC4V40 AA 0 37 WHT BLK 138 2 BLK RED 159 0 1 100O325O258 16 5 47 42 37 3 KP0A KM04A Electrical data Fan motor Special remarks Capacity MSH A18ND MSH A24ND NOTE Test conditions are based on ISO 5151 Cooling Indoor DB27 C WB19 C Heating Indoor DB20 C WB 15 5 C Outdo...

Страница 5: ... Insulation 28 Drain hose 16 Connected part O D Installation plate Wall hole 75 Wireless remote controller Installation plate Indoor unit Liquid line 6 35 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D Liquid line 9 52 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D for MSH A18ND for MSH A24ND INDOOR UNIT MSH A18ND MSH A24ND Unit mm ...

Страница 6: ...AY P C BOARD RECEIVER P C BOARD REMOTE CONTROLLER TAB12 TB 3 3 3 3 N 2 2 3 1 3 1 4 INDOOR UNIT BLK GRY YLW BRN WHT RED MF 3 SR141 4 3 1 1 4 2 3 CN 121 C11 HIC1 MV1 RT13 CN112 151 CN MV2 15 RT12 RT11 111 CN CN211 NR11 ELECTRONIC CONTROL P C BOARD F11 220V BRN CN201 12V TO OUTDOOR UNIT CONNECTING MV2 BLU RED CN 101 CN 102 DISPLAY P C BOARD RECEIVER P C BOARD REMOTE CONTROLLER 3 3 TAB12 TB 3 N 2 1 2 ...

Страница 7: ...tor Flared connection Flared connection Indoor coil thermistor RT12 Refrigerant pipe 6 35 with heat insulator Distributor Strainer 50 MSH A24ND INDOOR UNIT Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 15 88 with heat insulator Flared connection Flared connection Refrigerant pipe 6 35 with heat insulator Distributor Unit mm Indoor coil thermistor RT12 main Indoor coil the...

Страница 8: ...2 7 2 P C BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room In this case to operate each indoor unit individually by each remote controller P C boards of remote controller must be modified according to the number of the indoor unit How to modify the remote controller P C board Remove batteries before modification The boar...

Страница 9: ...e remote controller was operated with the remote controller If main power is turned off or a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled If the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is off To prevent breaker off due to the rush of starting c...

Страница 10: ...OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how many times the abnormality indication is flashing on and off before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and...

Страница 11: ...use Indoor unit Trouble of room temp erature indoor coil thermistor 3 time flash Cause Indoor unit Trouble of indoor fan motor 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 8 5 D How to check mis wiring When outdoor unit doesn t work Check room temperature thermistor and indoor coil thermis tor Refer...

Страница 12: ... Check of outdoor thermistor Refer to outdoor unit service manual Check the deicer P C board Refer to outdoor unit service manual Refer to 8 5 D How to check mis wiring 3 Indoor fan motor Abnormal point Outdoor unit does not operate Room temperature thermistor Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds during operation Refer to the characteristics of main ...

Страница 13: ...ntal vane motor MV1 Vertical vane motor MV2 Motor part Sensor part Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Color of lead wire BRN YLW YLW GRY Normal 4 5 5 5V Measure the voltage power ON When fan revolved one time 0V 5V 0V Approx Normal 282 306 Measure the resistance between the terminal with a tester Part temperature 10 C 30 C BLK RED WHT GRY YLW BRN ...

Страница 14: ...receiver P C board connector CN301 No 1 and No 3 when the remote controller button is pressed Is the voltage approx 4V DC Replace the indoor electronic control P C board Replace the receiver P C board Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving part Yes 0 or No others Yes No Yes No Press OPERATE STOP ON OFF button on the remote controller Is LCD d...

Страница 15: ...e varistor Yes Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply No Does the unit operate with the remote controller Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch Yes No Turn OFF the power supply Turn OFF the power supply Varistor NR11 Ind...

Страница 16: ... OPERATION switch once Is this mis wiring poor contact or wire disconnection Correct them Replace the indoor electronic control P C board No Replace the deicer P C board Yes No Make the wiring between CN730 on the deicer P C board and outdoor terminal block correct Replace the deicer P C board Yes Is there 5V DC between J205 J101 J101 J401 on the deicer P C board Yes Yes After 3 minutes mis wiring...

Страница 17: ...istance k Fan motor power supply Fuse F11 250V AC 3 15A Power supply input 220V AC 5V DC Indoor coil thermistor RT12 main Timer short mode point JPS JPG Refer to 7 1 Emergency operation switch 12V DC Room temperature ther mistor RT11 Release of Auto restart function Solder jumper wire to JR07 Refer to 7 3 MSH A24ND Indoor coil thermistor RT13 sub PS132 Receiver P C board ...

Страница 18: ... of the front panel Remove the screws 2 Pull the panel down to your side slightly and unhook the catches at the top Photo 1 Photo 2 Front panel Screws 2 Removing the electronic control P C board the receiver P C board and the display P C board 1 Remove the front panel Refer to 1 2 Remove the screw of the electrical cover Remove the electrical cover 3 Remove the screws of the V A clamp Remove the V...

Страница 19: ...hose from the nozzle assembly and remove the nozzle assembly 6 Remove the screws of the vane motor and disconnect the connector 7 Remove the vane motor Screws fixing the fan motor 5 Removing the line flow fan and the indoor fan motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Remove ...

Страница 20: ...AMP PANEL Symbol in Wiring Diagram Q ty unit Including No 4 5 6 4PCS SET 3PCS SET MAC 1700FT Remarks Part No NO Part Name 1 2 3 4 5 6 7 8 9 10 1 1 1 4 3 1 2 2 1 1 1 1 1 4 3 1 2 2 1 1 10 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 9 8 See 10 5 11 12 3 E02 891 620 E02 893 620 E02 179 667 E02 527 666 E02 151 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID 12 7 15 88 6 35...

Страница 21: ...MINAL BLOCK INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET RIGHT VANE MOTOR SUPPORT SET LEFT Symbol in Wiring Diagram Q ty unit 3 15A RIGHT LEFT UP DOWN Remarks Part No NO Part Name F11 NR11 MF MF MV2 MV1 RT11 TB RT12 RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 RC4V32 Including RUBBER MOUNT AUTO RESTART Including No 16 AUT...

Страница 22: ...EANING FILTER is 4 months However when it becomes dirty replace it as soon as possible 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 MAC 1700FT MSH A18ND MSH A24ND PARTS LIST non RoHS compliant ...

Страница 23: ...in Wiring Diagram Q ty unit Including No 4 5 6 4PCS SET 3PCS SET MAC 1700FT Remarks Part No NO Part Name 1 2 3 4 5 6 7 8 9 10 1 1 1 4 3 1 2 2 1 1 1 1 1 4 3 1 2 2 1 1 RoHS G G G G G G G G G G 11 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 9 8 See 11 5 11 12 3 E12 891 620 E12 893 620 E12 179 667 E12 527 666 E12 151 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID 12 7 15...

Страница 24: ...TOR INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET RIGHT VANE MOTOR SUPPORT SET LEFT Symbol in Wiring Diagram Q ty unit 3 15A RIGHT LEFT UP DOWN Remarks Part No NO Part Name F11 NR11 MF MF MV2 MV1 RT11 TB RT12 RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 RC4V32 Including RUBBER MOUNT AUTO RESTART Including No 16 AUTO RESTART Including No 16 RC4V4...

Страница 25: ...EANING FILTER is 4 months However when it becomes dirty replace it as soon as possible 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 MAC 1700FT MSH A18ND MSH A24ND RoHS PARTS LIST RoHS compliant ...

Страница 26: ...26 ...

Страница 27: ...27 ...

Страница 28: ... 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 Distributed in Nov 2005 No OB427 106 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN TM ...

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