Mitsubishi Electronics MSH-A18ND User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type Models

Revision B:

•Remote controller model has been changed.

•RoHS PARTS LIST has been added. Please void OB427 REVISED EDITION-A.

No. OB427

REVISED EDITION-B

MSH-A18ND MSH-A24ND -

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. 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

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).

Grille

Air inlet

Remote controller

Remote control

receiving section

Air cleaning filter (White bellows type)

Horizontal vane

Vertical vanes

Catechin air filter

(When the grille is opened)

Operation section

Display section

Emergency operation switch

Operation indicator lamp

Remote control

receiving section

Front panel

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 cleaning filter Felt tape (Used for left or left-rear piping)

1 7 1 2 2 1 2 1

MSH-A18ND MSH-A24ND

Revision A:

• Parts No. of 10.PARTS LIST has been revised.

Revision B:

•Remote controller model has been changed. (KP0A ➔ KM04A) Both remote controllers can be used as alternative.

•RoHS PARTS LIST has been added.

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. Electricity receiving unit has been changed from indoor unit to outdoor unit.

TECHNICAL CHANGES

S1S1

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSH-A18ND MSH-A24ND

ACCESSORIES

REMOTE CONTROLLER

ON/OFF

TOO

COOL

TOO

WARM

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

WIDE VANE

LONG

I FEEL

COOL

HEAT

DRY

CLOCK

RESET CLOCK

Open the front 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 is on back.

MSH-A18ND MSH-A24ND

Indoor model

Function

Power supply

Air flow

(High/Med./Low) Running current Power input Power factor Model Current Winding resistance (at 20:) Dimensions WOHOD Weight Air direction Sound level (High/Med./Low) Fan speed (High/Med./Low) Fan speed regulator Remote controller model

K /h

A W %

rpm

Single phase

220V, 60Hz

768/642/516

0.28 60 97

RC4N32-AA

0.28

WHT-BLK 205.5 BLK-RED 217.6 1,100O325O258

42/37/32

1,070/920/780

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

47/42/37

KP0A, KM04A

Electrical

data

Fan

motor

Special

remarks

Capacity

MSH-A18ND MSH-A24ND

SPECIFICATION

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C

Indoor-Outdoor piping length : 5m

Test conditions are based on SSA 356/366. Cooling : Indoor DB29°C WB19°C Heating : Indoor DB21°C

Indoor-Outdoor piping length : 7.5m

Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C

Outdoor DB46°C WB24°C Outdoor DB 7°C WB 6°C

258

162

7.5

315

255.547

2.5

173

98 173414.5 414.5

253

791

1068

1100

325

Air out

Air in

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

OUTLINES AND DIMENSIONS

MSH-A18ND MSH-A24ND

INDOOR UNIT

Unit: mm

WIRING DIAGRAM

MSH-A18ND

INDOOR UNIT

TO OUTDOOR UNIT CONNECTING

12V

220V~

SYMBOL

C11 F11

HIC1

NOTES:

INDOOR FAN CAPACITOR FUSE (3.15A) DC/DC CONVERTER FAN MOTOR (INNER PROTECTOR)

1.About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3.Symbols below indicate. : Terminal block

3 N 2

RED BLU BRN

NAME

CN 151

GRN/YLW

MV2 MV2 MV1

: Connector

SYMBOL

NR11 RT11

CN201

3 2 1

F11

CN 102

TAB12

ELECTRONIC CONTROL P.C. BOARD

101

DISPLAY P.C.BOARD

RECEIVER P.C.BOARD

NAME MV1 MV2

VANE MOTOR (HORIZONTAL) VANE MOTOR (VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR

HIC1

NR11

SR141

REMOTE CONTROLLER

C11

CN211

SYMBOL

RT12

SR141

CN 112

CN 111

CN 121

1 3 4

RT12 RT11

BLK GRY YLW BRN WHT RED

NAME INDOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK

MSH-A24ND

INDOOR UNIT

TO OUTDOOR UNIT CONNECTING

12V

220V~

SYMBOL

C11 F11

HIC1

MV1

NOTES:

INDOOR FAN CAPACITOR FUSE (3.15A) DC/DC CONVERTER INDOOR FAN MOTOR (INNER PROTECTOR) VANE MOTOR (HORIZONTAL)

1.About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3.Symbols below indicate. : Terminal block

3 N 2

RED BLU BRN

GRN/YLW

NAME

MV2

151

MV2

MV1

SYMBOL

NR11 RT11 RT12 RT13

: Connector

CN201

2 1

TAB12

CN 102

ELECTRONIC CONTROL P.C. BOARD

101

DISPLAY P.C.BOARD

RECEIVER P.C.BOARD

NAME NAME

MV2

VANE MOTOR (VERTICAL) VARISTOR ROOM TEMPERATURE THERMIST OR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB)

HIC1

F11

REMOTE CONTROLLER

NR11

SR141

4 3 2 1

CN112

CN 121

C11

3 4

CN211

111

SYMBOL

SR141

RT13

RT12

BLK GRY YLW BRN WHT RED

RT11

SOLID STATE RELAY TERMINAL BLOCK

Strainer

#50

Strainer

#50

REFRIGERANT SYSTEM DIAGRAM

MSH-A18ND

INDOOR UNIT

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12

Distributor

Refrigerant pipe [12.7 (with heat insulator)

Flared connection

MSH-A24ND

INDOOR UNIT

Indoor heat exchanger

Indoor coil thermistor RT13(sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Distributor

Unit:mm

Refrigerant pipe [15.88 (with heat insulator)

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

No. 1 unit No. 2 unit No. 3 unit No. 4 unit

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder J2

–

4 units operation

Same as at left Same as at left Same as at left

Solder both J1 and J2

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 ➔ 1-second Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

shortened by short circuit of JPG and JPS.)

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 board has a print as shown below :

NOTE : For modification, take out the batteries and press the OPERATE/STOP(ON/OFF) button 2 or 3 times at first.

After modification, put back the batteries then press the RESET button.

Remote controller model : KM04A

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button.

Remote controller model : KP0A

Table 1

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored.

7-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “Auto restart function” automatically starts operation in the same mode just before the shutoff of the main power. However if the unit is operated in “I FEELCONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided by the initial room temperature.

How to release “AUTO RESTART FUNCTION”

JR07

IC152

CN151

CN112

CN111

CN121

SW1

IC101

RA102

C11

CN201

CN211

TAB12

1Turn off the main power for the unit. 2Pull out the electronic control P.C. board, the receiver P.C.

board and the display P.C.board. (Refer to 9-2.)

3Solder jumper wire to JR07 on the indoor

electronic control P.C. board. (Refer to 8-6.)

Operation

If the main power has been cut, the operation settings remain.

1 2After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes

for the compressor to start running.)

NOTE

•The operation settings are memorized when 10 seconds have passed after the 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 current, systematize other home appliances not to turn on at the same

time.

•When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.

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