Mitsubishi Electric MS-A18VD-K1, MS-A18VD-K2, MS-A24VD-K1, MS-A18VD, MS-A30VD-K2 Service Manual

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

Revision C:

• Another type of the electronic control P.C.
board (TYPE 2) has been added to the
original one (TYPE 1). They are both com­patible with MS-A18/24/30VD- .

Please void OB400, REVISED EDITION-B.

K

No. OB400

REVISED EDITION-C

MS-A18VD­MS-A18VD­MS-A24VD­MS-A24VD­MS-A30VD­MS-A30VD-

MS-A18VD
MS-A24VD
MS-A30VD

K1

K2

K1

K2

K1

K2

Outdoor unit service manual

MU-A·VD Series (OB401)

CONTENTS

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

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

3. SPECIFICATION·················································5

4. OUTLINES AND DIMENSIONS·························6

5. WIRING DIAGRAM ············································7

6. REFRIGERANT SYSTEM DIAGRAM················9

7. SERVICE FUNCTIONS ····································10

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

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

10. PARTS LIST······················································23

11. RoHS PARTS LIST···········································26

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.

TM

Indoor unit:Unit size:W1,015mmoH320mmoD190mm ➞ W1,100mmoH325mmoD258mm
Electricity receiving unit: Indoor unit ➞ Outdoor unit
Rated voltage : 220/240V ➞ 220-230-240V

Frequency
New Model
Old Model

MS-18NV -

KB

w

: change

MS-A18VD -

K1

50Hz

MS-18UV -

P1

MS-18RV -

R1

w
w
w

w
w

w

Indoor unit:Unit size:W1,015mmoH320mmoD190mm ➞ W1,100mmoH325mmoD258mm
Electricity receiving unit: Indoor unit ➞ Outdoor unit
Rated voltage : 220/240V ➞ 220-230-240V

Frequency
New Model
Old Model

MS-24NV -

K1

MS-A24VD -

K1

50Hz

MS-24UV - P1MS-24RV -

R1

w
w
w

w
w

w

Indoor unit:Unit size:W1,100mmoH325mmoD227mm ➞ W1,100mmoH325mmoD258mm
Rated voltage : 220/240V ➞ 220-230-240V

Frequency
New Model
Old Model

MS-30SV - K1MS-30SV -

P1

MS-A30VD -

K1

50Hz

w
w

w

Use the specified refrigerant only

OB400C

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.

Revision A:

• MS-A18VD- , MS-A24VD- and MS-A30VD- have been added.

K2K2K2

Revision B:

• Remote controller model “KM04B” has been added.
There are two remote controller models for “ ” and “ ”. (KP0B, KM04B)
You can use the remote controller model “KP0B” and “KM04B”.
The remote controller model “KM04B” is supplied as service parts for “ ” and “ ”.

K2K1

K2K1

Revision C:

• Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com-

patible with MS-A18/24/30VD- .

K

TECHNICAL CHANGES1

MS-A18VD - ➔ MS-A18VD ­MS-A24VD - ➔ MS-A24VD ­MS-A30VD - ➔ MS-A30VD -

1. Fan guard has been added.

2. Fan speed has been changed.

K2K1

K2K1

K2K1

3. Wiring diagram has been changed.

4. FUSE (F12) has been removed. (MS-A18/24VD- )

5. “8-5.C Check of indoor electronic control P.C. board” has been changed.

K2

2

2

OB400C

PART NAMES AND FUNCTIONS

INDOOR UNIT

MS-A18VD
MS-A24VD
MS-A30VD

Air cleaning filter
(White bellows type)

Front Panel

Catechin air filter

Vertical vanes

Horizontal vane

Operation section

(When the grille is opened)

Emergency operation switch

Grille

Air inlet

Remote control

receiving section

Remote controller

Display section

Operation indicator lamp

Remote control

receiving section

3

ON/OFF

TOO

COOL

PM

AM

TOO

WARM

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

WIDE VANE

LONG

I FEEL

COOL

DRY

PM

CLOCK

AM

RESET CLOCK

FAN

Open the front lid.

Signal transmitting section

Operation display section

OPERATE/ STOP

(ON/ OFF)button

TEMPERATURE buttons

Indication of remote controller
model is on back.

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)

Installation plate
Installation plate fixing screw 4 x 25 mm
Remote controller holder
Fixing screw for 3 3.5 x 16 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Air cleaning filter
Pipe cover

1
2
3
4
5
6
7
8
9

1
7
1
2
2
1
1
2

ACCESSORIES

OB400C

REMOTE CONTROLLER

MS-A18VD
MS-A24VD
MS-A30VD

4

3

Indoor model

Function

Power supply

Air flow

(High/Med./Low)
Running current
Power input
Auxiliary heater
Power factor
Fan motor current
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Air direction
Sound level

(High/Med./Low)

Fan speed

(High/Med./Low)
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Thermistor RT13(at 25:)
Remote controller model

Electrical

data

Fan

motor

Special

remarks

Capacity

Cooling

Single phase

220-230-240V, 50Hz

1,100O325O258

16

5

3
10
10

KP0B / KM04B

0.33-0.34-0.35
67-69-75

—

92-88-89

0.33-0.34-0.35

RC4V40-AA
WHT-BLK 138.2
RED-BLK 159.0

774/660/552

0.30-0.30-0.31
60-60-64

—

91-87-86

0.30-0.30-0.31

RC4V32-AA
WHT-BLK 293.0
RED-BLK 146.0

42/37/33



K /h

A

W

A(kW)

%

A

"



mm

kg

dB

rpm

k"
k"
k"

972/828/684



45/41/37

1,220/1,070/910 1,280/1,130/970

1,220/1,070/910 1,280/1,130/9701,010/880/760 1,070/920/780

—

10

MS-A18VD - K1 MS-A18VD - K2 MS-A24VD - K1 MS-A24VD - K2 MS-A30VD - K1 MS-A30VD - K2

OB400C

SPECIFICATION

NOTE:Test conditions are based on ISO 5151.

Cooling : Indoor Dry-bulb temperature 27: Wet-bulb temperature 19:

Indoor-Outdoor piping length : 5 m

Outdoor Dry-bulb temperature 35: Wet-bulb temperature 24:

5

OUTLINES AND DIMENSIONS4

OB400C

MS-A18VD MS-A24VD MS-A30VD

INDOOR UNIT

Unit: mm

325

56

58

1100

791

19

1068

253

Installation plate

98

47

98 173414.5 414.5

Wall hole [75

Air in

258

Air out

5

Installation plate

Indoor unit

173

Liquid line [ 6.35-0.5m
Gas line [ 12-0.43m

{

Insulation [ 50 O.D

Liquid line [ 9.52-0.5m
Gas line [ 16-0.43m

{

Insulation [ 50 O.D

Drain hose [16
(Connected part O.D)

Insulation [28

2.5

[ 32 I.D

for MS-A18VD
for MS-A24VD

[ 32 I.D

for MS-A30VD

255.547

7.5

315

162

Wireless remote controller

6

5

OB400C

WIRING DIAGRAM

MS-A18VD - MS-A24VD -

K1K1

INDOOR UNIT

TO OUTDOOR
UNIT
CONNECTING

220-230-240V~

220-230-240V~

SYMBOL

C11

F11

F12

HIC1

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

INDOOR FAN CAPACITOR
FUSE(3.15A)
THERMAL FUSE (93:)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER PROTECTOR)

MF

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

3. Symbols below indicate.

/: Terminal block, : Connector

MS-A18VD - MS-A24VD -

TB

2

WHT

N

BLU

L

BRN

NAME

F12

GRN/YLW

MV2

CN
151

MV2

BLU

1

BLU

2

15

MV1

SYMBOL

NR11
RT11
RT12

K2K2

MV1
MV2

CN201

3
2

BLU

1

CN

102

CN

ELECTRONIC CONTROL P.C. BOARD

101

33

DISPLAY
P.C. BOARD

RECEIVER
P.C. BOARD

NAME NAME
HORIZONTAL VANE MOTOR
VERTICAL VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR
INDOOR COIL THERMISTOR

HIC1

3

52C/
X11

4

F11

REMOTE
CONTROLLER

INDOOR UNIT

TO OUTDOOR
UNIT
CONNECTING

220-230-240V~

220-230-240V~

TB

2

WHT

N

BLU

L

BRN

CN
151

CN

102

CN201

3
2
1

CN

ELECTRONIC CONTROL P.C. BOARD

101

HIC1

3

X11

4

F11

NR11

SR141

NR11

SR141

C11

CN211

SYMBOL

SR141

TB

52C/X11

CN

112

CN

111

CN
121

1

C11

3
4

CN211

CN

112

CN

111

CN
121

3

1
3
4

RT12
RT11

BLK
GRY
YLW
BRN
WHT
RED

MF

SOLID STATE RELAY
TERMINAL BLOCK
COMPRESSOR CONTACTOR

RT12
RT11

3

BLK
GRY
YLW
BRN
WHT
RED

MF

GRN/YLW

MV2

SYMBOL

C11
F11

HIC1

MV1

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

INDOOR FAN CAPACITOR
FUSE(T3.15AL250V)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER PROTECTOR)

MF

HORIZONTAL VANE MOTOR

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

3. Symbols below indicate.
/: Terminal block, : Connector

NAME

MV2

15

MV1

DISPLAY
P.C. BOARD

SYMBOL

MV2

NR11

RT11

RT12

SR141

33

RECEIVER
P.C. BOARD

REMOTE
CONTROLLER

NAME NAME
VERTICAL VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR
INDOOR COIL THERMISTOR
SOLID STATE RELAY

7

SYMBOL

TB

X11

TERMINAL BLOCK
CONTACTOR

MS-A30VD

OB400C

INDOOR UNIT

TO OUTDOOR
UNIT
CONNECTING

12V

220-230-240V~

3

N

2

TB

RED
BLU
BRN

CN

151

CN

102

CN201

3
2
1

TAB12

HIC1

NR11

F11

CN

ELECTRONIC CONTROL P.C. BOARD

101

SR141

C11

4
3
2
1

CN112

CN

121

1
3
4

CN211

CN

111

RT13

RT12

3

BLK
GRY
YLW
BRN
WHT
RED

RT11

MF

MV2

15

MV1

DISPLAY
P.C. BOARD

SYMBOL

MV2
NR11
RT11
RT12
RT13

33

RECEIVER
P.C. BOARD

REMOTE
CONTROLLER

NAME NAME
VERTICAL V ANE MOT OR
V ARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR (MAIN)
INDOOR COIL THERMISTOR (SUB)

GRN/YLW

MV2

SYMBOL

C11
F11

HIC1

MV1

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

INDOOR FAN CAPACITOR
FUSE (T3.15AL250V)
DC/DC CONVERTER
INDOOR FAN MOTOR (INNER PROTECTOR)

MF

HORIZONT AL VANE MOT OR

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

3. Symbols below indicate.
/: Terminal block, : Connector

NAME

SYMBOL

SR141

TB

SOLID STATE RELAY
TERMINAL BLOCK

8

6

Indoor
heat
exchanger

Flared connection

RT11
Room
temperature
thermistor

Distributor

Flared connection

Refrigerant pipe
[12.7
(with heat insulator)

Refrigerant pipe
[6.35
(with heat insulator)

Indoor coil
thermistor
RT12

Strainer

#50

OB400C

REFRIGERANT SYSTEM DIAGRAM

MS-A18VD

INDOOR UNIT

Unit : mm

MS-A24VD

INDOOR UNIT

Indoor
heat
exchanger

Room temperature
thermistor
RT11

Indoor coil
thermistor
RT12

Strainer

#50

Refrigerant pipe
[15.88
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe
[6.35
(with heat insulator)

MS-A30VD

INDOOR UNIT

Indoor
heat
exchanger

Indoor coil
thermistor
RT13 (sub)

Room temperature
thermistor
RT11

Strainer

Indoor coil
thermistor
RT12 (main)

#50

Refrigerant pipe
[15.88
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe
[9.52
(with heat insulator)

Refrigerant flow in cooling

9