Mitsubishi Electric MS-A18WV User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM················8
8. MICROPROCESSOR CONTROL ······················9
9. SERVICE FUNCTIONS ····································17
10. TROUBLESHOOTING······································19
11. DISASSEMBLY INSTRUCTIONS·····················27
12. PARTS LIST······················································29
13. OPTIONAL PARTS···········································31
Wireless type
Models
MS-A18WV - (WH)
MS-A24WV - (WH)
MS-A30WV - (WH)
E1
E1
E1
No. OB325
SPLIT-TYPE, AIR CONDITIONERS
MS-A18WV -
MS-A24WV -
MS-A30WV - E1
E1
E1
NOTE:
This service manual describes technical data of the indoor units.
As for outdoor units MU-A18WV- , MU-A24WV- and MU-A30WV- , refer to service manual
OB326. E1E1E1
Indication of model name
OB325-1.qxp 03.12.3 1:03 PM Page 1

TECHNICAL CHANGES
2
1
PART NAMES AND FUNCTIONS
2
INDOOR UNIT
Grille
(When the grille is opened)
Remote controller
Operation section Display section
Operation Indicator
Emergency operation switch
Operation indicator lamp
Air inlet
Horizontal vane
Remote control
receiving section
Catechin air filter
Air cleaning filter (option)
(White bellows type)
Vertical vanes
Front panel
Remote control
receiving section
MS-A18WV -
MS-A24WV -
MS-A30WV - E1
E1
E1
MS-18RV - ➔MS-A18WV -
1. Indoor unit model has changed.
2. Rated voltage has changed. (220V-240V ➜230V)
3. Remote controller has changed.
• LONG MODE and WIDE MODE have been added.
4. Indoor fan motor has changed.(RA4V27-EF ➜RC4V32-AA)
5. Indoor heat exchanger has changed.
6. Diameter of connect pipe has changed.(Liquid:[8 ➜[6.35)
7. Air filter has changed to catechin air filter.
MS-24RV - ➔MS-A24WV -
1. Indoor unit model has changed.
2. Rated voltage has changed. (220V-240V ➜230V)
3. Remote controller has changed.
• LONG MODE and WIDE MODE have been added.
4. Indoor fan motor has changed.(RA4V27-EE ➜RC4V32-AA)
5. Indoor heat exchanger has changed.
6. Diameter of connect pipe has changed.(Liquid:[8 ➜[6.35)
7. Air filter has changed to catechin air filter.
MS-30RV - ➔MS-A30WV -
1. Diameter of connect pipe has changed.(Gas:[15.88 ➜[12)
2. Rated voltage has changed. (220V-240V ➜230V)
3. Power supply cord has been added.
4. Air filter has changed to catechin air filter.
E1E1
E1E1
E1E1
ACCESSORIES
Indoor unit
1
2
3
4
5
6
7
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
Felt tape (Used for left or left-rear piping)
1
7
1
2
2
1
1
MS-A18WV-
MS-A24WV-
MS-A30WV-
E1
E1
E1
OB325-1.qxp 03.12.3 1:03 PM Page 2

REMOTE CONTROLLER
MS-A18WV -
MS-A24WV -
MS-A30WV - E1
E1
E1
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
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.
OB325-1.qxp 03.12.3 1:03 PM Page 3

SPECIFICATION
4
3
Indoor model
Function
Power supply
Air flow
(High/Med. /Low )
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med. /Low )
Fan speed(High/Med. /Low )
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Remote controller model
K/h
A
A
W
A(kW)
%
A
"
mm
kg
dB
rpm
k"
k"
MS-A18WV - E1
Cooling
Single phase
230V, 50Hz
768/642 /528
10
0.30
60
—
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O227
16
5
42/38 /34
1,070/920 /780
3
10
10
KP0B or KG1D
MS-A24WV - E1
Cooling
Single phase
230V, 50Hz
768/672 /588
10
0.30
60
—
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O227
16
5
45/41 /37
1,070/960 /850
3
10
10
KP0B or KG1D
Electrical data
Fan motor
Special remarks
Capacity
ww
ww
ww
ww
ww
ww
ww
ww
ww
NOTE: 1. Test conditions are based on JIS C 9612.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C)
Indoor-Outdoor piping length 5m
2. Remote controller model KP0B and KG1D are the same in terms of specification.
wReference value
Indoor model
Function
Power supply
Air flow
(High/Med. /Low )
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med. /Low )
Fan speed(High/Med. /Low )
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Thermistor RT13(at25:)
Remote controller model
K/h
A
A
W
A(kW)
%
A
"
mm
kg
dB
rpm
k"
k"
k"
MS-A30WV - E1
Cooling
Single phase
230V, 50Hz
960/822 /684
10
0.34
69
—
88
0.34
RC4V40-AA
WHT-BLK 138.2
BLK-RED 159.0
1,100O325O227
16
5
47/42 /37
1,280/1,130 /970
3
10
10
10
KP0B or KG1D
Electrical data
Fan motor
Special remarks
Capacity
ww
ww
ww
ww
ww
ww
OB325-1.qxp 03.12.3 1:03 PM Page 4

5
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
47
SPL(dB(A)) LINE
High
FAN SPEED
MS-A30WV- E1
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
42
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
45
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MS-A18WV- E1 MS-A24WV- E1
INDOORUNIT WALL
MICROPHONE
0.8m
1m
OB325-1.qxp 03.12.3 1:03 PM Page 5

OUTLINES AND DIMENSIONS
6
5
162
19
58
47
7.5315
255.547
2.5
98 173
98 173414.5 414.5
5225
253
791
56
1068
1100
325
Air out
Air in
Insulation [28
Drain hose [16
(Connected part O.D)
{
Liquid line [6.35-0.5m
Gas line [12-0.43m
Insulation [50 O.D
[32 I.D
Installation plate
Wall hole [75
Wireless remote controller
Installation plate Indoor unit
{
Liquid line [9.52-0.5m
Gas line [12-0.43m
Insulation [50 O.D
[32 I.D
for MS-A18/A24WV
for MS-A30WV
Power supply cord
Lead to right 2.0m
Lead to left 1.0m
INDOOR UNIT
MS-A18WV -
MS-A24WV -
MS-A30WV - E1
E1
E1 Unit: mm
OB325-1.qxp 03.12.3 1:03 PM Page 6

MODELS WIRING DIAGRAM
MODEL WIRING DIAGRAM
7
WIRING DIAGRAM
6
MS-A18WV -
MS-A24WV - E1
E1
INDOOR UNIT
12V BLK
GRY
YLW
BRN
WHT
RED
3
SR141 4
3
1
CN
121
C11
HIC1
TRANS
MV1
2
1
CN112
151
CN
MV2
15
RT12
RT11
111
CN
CN211
NR11
ELECTRONIC CONTROL
P. C. BOARD
F11
LBRN
1
2
3
CN201
MV2
CN
101
CN
102
DISPLAY
P. C. BOARD RECEIVER
P. C. BOARD
REMOTE
CONTROLLER
33
TAB12
GRN/YLW
N
TB 2
1
2
1
CN202
TO OUTDOOR UNIT
CONNECTING BLK
WHT
BLU
BRN
BLU
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
MF
NAME
INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR (INNER FUSE)
SYMBOL
MV1
MV2
NR11
RT11
NAME
VANE MOTOR (HORIZONTAL)
VANE MOTOR (VERTICAL)
VARISTOR
ROOM TEMPERATURE THERMISTOR
SYMBOL
RT12
SR141
TB
NAME
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
MF
1
2
3
4
5
6
PE CIRCUIT
BREAKER
POWER
SUPPLY
CORD
~/N 230V
50Hz
INDOOR UNIT
12V
TO OUTDOOR
UNIT
CONNECTING
BRN
BLU
GRN/YLW
BLK
GRY
YLW
BRN
WHT
RED
MF
3
SR141 4
3
1
CN
121
C11
HIC1
TRANS
MV1
RT13
4
3
2
1
CN112
151
CN
MV2
15
RT12
RT11
111
CN
CN211
NR11
ELECTRONIC CONTROL
P. C. BOARD
F11
3
N
LBRN
1
2
3
CN201
MV2
BLU
RED
CN
101
CN
102
DISPLAY
P. C. BOARD RECEIVER
P. C. BOARD
REMOTE
CONTROLLER
33
TAB12
TB
PE CIRCUIT
BREAKER
POWER
SUPPLY
CORD
~/N 230V
50Hz
SYMBOL
SR141
TB
SYMBOL
MV2
NR11
RT11
RT12
RT13
SYMBOL
C11
F11
HIC1
MF
MV1
NAME NAME NAME
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
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
MS-A30WV - E1
OB325-1.qxp 03.12.3 1:03 PM Page 7

REFRIGERANT SYSTEM DIAGRAM
8
7
MS-A30WV - E1
INDOOR UNIT
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
Refrigerant flow in cooling
MS-A18WV - E1
INDOOR UNIT
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe [12.7
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12
Refrigerant pipe[6.35
(with heat insulator)
Distributor
MS-A24WV - E1
INDOOR UNIT
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe [15.88
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12
Refrigerant pipe [6.35
(with heat insulator)
Distributor
Unit:mm
OB325-1.qxp 03.12.3 1:03 PM Page 8

9
MICROPROCESSOR CONTROL
8
WIRELESS REMOTE CONTROLLER
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
Initial room temperature
25:or more
more than 13:,
less than 25:
Once the operation mode are set, the same operation mode
can be repeated by simply turning the OPERATE/STOP
(ON/OFF) button ON.
Indoor unit receives the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to
protect system from overload and compressor will not restart
for 3 minutes.
8-1. “I FEEL CONTROL” ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button on the remote
controller. OPERATION INDICATOR lamp of the indoor
unit turns on with a beep tone.
(2) Select “I FEEL CONTROL” mode with the OPERATION
SELECT button.
(3) The operation mode is determined by the room tempera-
ture at start-up of the operation.
MS-A18WV - MS-A24WV - MS-A30WV - E1E1E1
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
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)
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
FAN
Signal transmitting section
Operation display section
OPERATE/ STOP
(ON/ OFF)button
TEMPERATURE buttons
lighted
not lighted
Approx. 2 :
or more
Difference
between target
temperature
and room
temperature
Approx. 2 :
or less
This shows that the
air conditioner is
operating to reach
the target temperature.
Please wait until the
target temperature is
obtained.
This shows that the
room temperature is
approaching the
target temperature.
Operation stateIndication
Operation Indicator
Operation Indicator lamp
The operation indicator at the right side of the indoor
unit indicates the operation state.
INDOOR UNIT DISPLAY SECTION
• The following indication applies regardless of
shape of the indicator.
OB325-1.qxp 03.12.3 1:03 PM Page 9

10
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
• Once the mode is fixed, the mode does not change by room temperature afterwards.
• Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the set time the
operation starts.
• When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode,
the system operates in previous mode automatically regardless of the room temperature.
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at
start-up of the operation.
Restart
COOL mode of
“I FEEL CONTROL”
Restart
COOL or DRY mode
of “I FEEL CONTROL”
that determined by
room temperature at
start-up of the opera-
tion.
Model
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
Initial room temperature Initial set temperature
26:or more
25:to 26:
more than 13:, less than 25:
24:
Initial room temperature
minus 2:
Initial room temperature
minus 2:
❈1
(4) The initial set temperature is decided by the initial room temperature.
❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of room temperature at restart.
The set temperature is calculated by the previous set temperature.
(5) TEMPERATURE buttons
In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.
• Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or
cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.
… To raise the set temperature 1~2 degrees(°C)
… To lower the set temperature 1~2 degrees(°C)
TOO
COOL
TOO
WARM
Operation timer chart
Example
Operation timer chart
Example
OB325-1.qxp 03.12.3 1:03 PM Page 10