Mitsubishi Electric MS-A18VD-K1 User manual

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
SPLIT-TYPE AIR CONDITIONERS
TM
MS-A18VD
MS-A24VD
MS-A30VD
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.
SERVICE MANUAL
Models
MS-A18VD-
MS-A18VD-
MS-A24VD-
MS-A24VD-
MS-A30VD-
MS-A30VD- K2
K1
K2
K1
K2
K1
No. OB400
REVISED EDITION-C
INDOOR UNIT
Outdoor unit service manual
MU-A·VD Series (OB401)
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
Please void OB400, REVISED EDITION-B.
OB400C--1.qxp 11.7.11 9:10 AM Page 1

2
TECHNICAL CHANGES1
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 -
P1
MS-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 -
K1
MS-30SV -
P1
MS-A30VD -
K1
50Hz
w
w
w
MS-A18VD - ➔MS-A18VD -
MS-A24VD - ➔MS-A24VD -
MS-A30VD - ➔ MS-A30VD -
1. Fan guard has been added.
2. Fan speed has been changed.
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
K2K1
K2K1
K2K1
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
Use the specified refrigerant only
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 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
OB400C--1.qxp 11.7.11 9:10 AM Page 2
OB400C

3
PART NAMES AND FUNCTIONS
2
MS-A18VD
MS-A24VD
MS-A30VD
INDOOR UNIT
Grille
(When the grille is opened)
Remote controller
Operation section Display section
Front Panel
Emergency operation switch
Operation indicator lamp
Air inlet
Remote control
receiving section
Air cleaning filter
(White bellows type)
Horizontal vane
Vertical vanes
Catechin air filter
Remote control
receiving section
OB400C--1.qxp 11.7.11 9:10 AM Page 3
OB400C

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)
4
Installation plate
Installation plate fixing screw 4 x 25 mm
Remote controller holder
Fixing screw for 33.5 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
REMOTE CONTROLLER
MS-A18VD
MS-A24VD
MS-A30VD
OB400C--1.qxp 11.7.11 9:10 AM Page 4
OB400C

5
SPECIFICATION
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
NOTE:Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:
Indoor-Outdoor piping length : 5 m
OB400C--1.qxp 11.7.21 9:26 AM Page 5
OB400C

6
OUTLINES AND DIMENSIONS4
Unit: mm
MS-A18VD MS-A24VD MS-A30VD
INDOOR UNIT
258
162
19
58
47
7.5
315
255.547
2.5
98 173
98 173414.5 414.5
5
253
791
56
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 [16-0.43m
Insulation [50 O.D
[32 I.D
for MS-A18VD
for MS-A30VD
for MS-A24VD
OB400C--1.qxp 11.7.21 9:26 AM Page 6
OB400C

7
WIRING DIAGRAM
5
MS-A18VD - MS-A24VD - K1K1
INDOOR UNIT
220-230-240V~ BLK
GRY
YLW
BRN
WHT
RED
MF
3
SR141 4
3
1
CN
121
C11
HIC1
MV1
151
CN
MV2
15
RT12
112
CN
CN211
NR11
ELECTRONIC CONTROL P.C. BOARD
F11
1
2
3
CN201
MV2
CN
101
CN
102
DISPLAY
P.C. BOARD RECEIVER P.C. BOARD
REMOTE
CONTROLLER
33
3
452C/
X11
F12 BLU
BLU
GRN/YLW
N
2
220-230-240V~
TO OUTDOOR
UNIT
CONNECTING
BRN
L
TB
BLU 2
1
WHT BLU
RT11
111
CN
NOTE: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, : Connector
SYMBOL
SR141
TB
52C/X11
SYMBOL
MV1
MV2
NR11
RT11
RT12
SYMBOL
C11
F11
F12
HIC1
MF
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(3.15A)
THERMAL FUSE (93:)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER PROTECTOR)
HORIZONTAL VANE MOTOR
VERTICAL VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
COMPRESSOR CONTACTOR
MS-A18VD - MS-A24VD - K2K2
INDOOR UNIT
220-230-240V~ BLK
GRY
YLW
BRN
WHT
RED
MF
3
SR141 4
3
1
CN
121
C11
HIC1
MV1
151
CN
MV2
15
RT12
112
CN
CN211
NR11
ELECTRONIC CONTROL P.C. BOARD
F11
1
2
3
CN201
MV2
CN
101
CN
102
DISPLAY
P.C. BOARD RECEIVER P.C. BOARD
REMOTE
CONTROLLER
33
3
4X11
GRN/YLW
N
2
220-230-240V~
TO OUTDOOR
UNIT
CONNECTING
BRN
L
TB
BLU
WHT
RT11
111
CN
NOTE: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, : Connector
SYMBOL
TB
X11
SYMBOL
MV2
NR11
RT11
RT12
SR141
SYMBOL
C11
F11
HIC1
MF
MV1
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(T3.15AL250V)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER PROTECTOR)
HORIZONTAL VANE MOTOR
VERTICAL VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
CONTACTOR
OB400C--1.qxp 11.7.21 9:26 AM Page 7
OB400C

8
MS-A30VD
INDOOR UNIT
BLK
GRY
YLW
BRN
WHT
RED
MF
3
SR141 4
3
1
CN
121
C11
HIC1
MV1
RT13
4
3
2
1
CN112
151
CN
MV2
15
RT12
RT11
111
CN
CN211
NR11
ELECTRONIC CONTROL P.C. BOARD
F11
220-230-240V~
3
N
2BRN
1
2
3
CN201
12V
TO OUTDOOR
UNIT
CONNECTING
GRN/YLW
MV2
BLU
RED
CN
101
CN
102
DISPLAY
P.C. BOARD RECEIVER P.C. BOARD
REMOTE
CONTROLLER
33
TAB12
TB
NOTE: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, : Connector
SYMBOL
SR141
TB
SYMBOL
MV2
NR11
RT11
RT12
RT13
SYMBOL
C11
F11
HIC1
MF
MV1
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE (T3.15AL250V)
DC/DC CONVERTER
INDOOR FAN MOTOR (INNER PROTECTOR)
HORIZONTAL VANE MOTOR
VERTICAL VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR (MAIN)
INDOOR COIL THERMISTOR (SUB)
SOLID STATE RELAY
TERMINAL BLOCK
OB400C--1.qxp 11.7.21 9:26 AM Page 8
OB400C

9
REFRIGERANT SYSTEM DIAGRAM
6
MS-A18VD
INDOOR UNIT
Unit : mm
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
MS-A24VD
INDOOR UNIT
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant pipe
[15.88
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Strainer
#50
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13 (sub)
Flared connection
Refrigerant pipe
[15.88
(with heat insulator)
Refrigerant pipe
[9.52
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Strainer
#50
MS-A30VD
INDOOR UNIT
OB400C--1.qxp 11.7.21 9:26 AM Page 9
OB400C

10
SERVICE FUNCTIONS
7
MS-A18VD
MS-A24VD
MS-A30VD
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.
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-6.)
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.
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 twice or 3 times at first.
After finish modification, put
back the batteries then press
the RESET button.
Remote controller model : KP0B
Remote controller model : KM04B
J2
J1
J2
J1
OB400C--1.qxp 11.7.21 9:26 AM Page 10
OB400C