Mitsubishi Electric MSH-A18ND-S1 Manual de usuario

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 PUMPAIR CONDITIONERS

Outdoor unit service manual

MUH-A·ND Series (OB428)

MSH-A18ND

MSH-A24ND

Wireless type

Models

MSH-A18ND -

MSH-A24ND - 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 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

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TECHNICAL CHANGES

PART NAMES AND FUNCTIONS

INDOOR UNIT

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

MSH-A18ND

MSH-A24ND

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.

S1S1

ACCESSORIES

Installation plate

Installation plate fixing screw 4 o25 mm

Remote controller holder

Fixing screw for 3o3.5 o1.6 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

Air cleaning filter

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

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.

OB427B-1.qxp 07.5.17 7:35 AM Page 2

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REMOTE CONTROLLER

MSH-A18ND

MSH-A24ND

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.

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

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SPECIFICATION

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

rpm

Single phase

220V, 60Hz

768/642/516

0.28

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

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

NOTE: Test conditions are based on ISO 5151.

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

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

Indoor-Outdoor piping length : 5m

Test conditions are based on SSA 356/366.

Cooling : Indoor DB29°C WB19°C Heating : Indoor DB21°C

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

Indoor-Outdoor piping length : 7.5m

OB427B-1.qxp 07.5.16 3:30 PM Page 4

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OUTLINES AND DIMENSIONS

258

162

7.5

315

255.547

2.5

98 173

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

INDOOR UNIT

MSH-A18ND

MSH-A24ND Unit: mm

OB427B-1.qxp 07.5.16 3:30 PM Page 5

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WIRING DIAGRAM

MSH-A18ND

INDOOR UNIT

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. : Connector

: Terminal block

NOTES:

SYMBOL

C11

F11

HIC1

NAME

INDOOR FAN CAPACITOR

FUSE (3.15A)

DC/DC CONVERTER

FAN MOTOR (INNER PROTECTOR)

SYMBOL

MV1

MV2

NR11

RT11

NAME

VANE MOTOR (HORIZONTAL)

VANE MOTOR (VERTICAL)

VARISTOR

ROOM TEMPERATURE THERMISTOR

SYMBOL

RT12

SR141

NAME

INDOOR COIL THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

RT11

RT12

BLK

GRY

YLW

BRN

WHT

RED

SR141

121

112

111

C11

CN211

HIC1

151

MV2 MV2 MV1

NR11

ELECTRONIC CONTROL P.C. BOARD

F11

220V~

BRN

CN201

12V

TO OUTDOOR

UNIT

CONNECTING

GRN/YLW

BLU

RED

101

102

DISPLAY

P.C.BOARD RECEIVER

P.C.BOARD REMOTE

CONTROLLER

TAB12

INDOOR UNIT

BLK

GRY

YLW

BRN

WHT

RED

SR141

121

C11

HIC1

MV1

RT13

CN112

151

MV2

RT12

RT11

111

CN211

NR11

ELECTRONIC CONTROL P.C. BOARD

F11

220V~

BRN

CN201

12V

TO OUTDOOR

UNIT

CONNECTING

MV2

BLU

RED

101

102

DISPLAY

P.C.BOARD RECEIVER

P.C.BOARD REMOTE

CONTROLLER

TAB12

GRN/YLW

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. : Connector

: Terminal block

NOTES:

SYMBOL

SR141

SYMBOL

MV2

NR11

RT11

RT12

RT13

SYMBOL

C11

F11

HIC1

MV1

INDOOR FAN CAPACITOR

FUSE (3.15A)

DC/DC CONVERTER

INDOOR FAN MOTOR (INNER PROTECTOR)

VANE MOTOR (HORIZONTAL)

VANE MOTOR (VERTICAL)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR (MAIN)

INDOOR COIL THERMISTOR (SUB)

SOLID STATE RELAY

TERMINAL BLOCK

NAME NAME NAME

MSH-A24ND

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REFRIGERANT SYSTEM DIAGRAM

Refrigerant flow in cooling

Refrigerant flow in heating

Strainer

#50

MSH-A18ND

INDOOR UNIT

Indoor

heat

exchanger

Room temperature

thermistor

RT11

Refrigerant pipe [12.7

(with heat insulator)

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

Refrigerant pipe [6.35

(with heat insulator)

Distributor

Unit:mm

Indoor coil

thermistor

RT12(main)

Indoor coil

thermistor

RT13(sub)

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SERVICE FUNCTIONS

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 FEEL CONTROL”mode before power

failure, the operation is not memorized. In “I FEEL CONTROL”mode, the operation is decided by the initial room tempera-

ture.

7-3. AUTO RESTART FUNCTION

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.)

MSH-A18ND

MSH-A24ND

Table 1

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

Solder J2

–

4 units operation

Same as at left

Solder both J1 and J2

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 :

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.

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.

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.

Remote controller model : KP0A

Remote controller model : KM04A

J1 J1

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How to release “AUTO RESTART FUNCTION”

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.)

JR07

IC152

CN151

CN112

CN111

CN121

SW1

IC101

RA102

C11

CN201

CN211

TAB12

Operation

1If the main power has been cut, the operation settings remain.

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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TROUBLESHOOTING

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.

(2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic

control P.C. board.

(3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.

(4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

3. Troubleshooting procedure

(1) First, check if the 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 the

components for bursting and discolouration.

(4) When troubleshooting, refer to 8-2. and 8-3.

4. How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

1Remove the front lid and insert batteries.

Then reattach the front lid.

Lead wiring Housing point

MSH-A18ND

MSH-A24ND

RESET button

2Press the RESET button with tip end of ball point

pen or the like, and then use the remote controller.

NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.

Insert the negative pole

of the batteries first.

Check if the polarity of

the batteries is correct.

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