Mitsubishi Electric Mr.Slim MS-CP13VA User manual

Models
MS-CP13VA -GU1
MS-CP18VA -GU1
MS-CP24VA -GU1
MS-CP30VA -GU1
PARTS CATALOG (OBB782)
MS-CP13VA
HFC
utilized
R410A
INDOOR UNIT
SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································6
4. OUTLINES AND DIMENSIONS·····················7
5. WIRING DIAGRAM·····································9
6. REFRIGERANT SYSTEM DIAGRAM ··········· 10
7. SERVICE FUNCTIONS······························ 12
8. MICROPROCESSOR CONTROL ················ 14
9. TROUBLESHOOTING······························· 20
10. DISASSEMBLY INSTRUCTIONS················· 41
Outdoor unit service manual
MU-CP∙VA Series (OBH783)
INDOOR UNIT
OBH782 is void.
Revision A:
• MS-CP30VA - GU1 has been added.
No. OBH782
REVISED EDITION-A
TM

2
Use the specied 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.
MS-CP13VA - GU1
MS-CP18VA - GU1
MS-CP24VA - GU1
1. New model
MS-CP30VA - GU1
1. New model
TECHNICAL CHANGES
1
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
When the refrigeration circuit has a leak, do not execute pump down with the
compressor.
When pumping down the refrigerant, stop the compressor before disconnecting the
refrigerant pipes. The compressor may burst if air etc. get into it.
Revision A:
• MS-CP30VA - GU1 has been added.
OBH782A

3
PART NAMES AND FUNCTIONS
2
MS-CP13VA
ACCESSORIES
Front panel
Air filter
(Nano platinum filter)
Air cleaning filter
(Electrostatic anti-
allergy enzyme
filter, option)
Air outlet
Horizontal vane
Air inlet
Heat exchanger
Remote controller
Display section
Operation indicator lamp
Remote control
receiving section
Emergencyoperation switch
Model MS-CP13VA
(1) Installation plate 1
(2) Installation plate xing screw 4 × 25 mm 5
(3) Wireless remote controller 1
(4) Felt tape (For left or left-rear piping) 1
(5) Remote controller holder 1
(6) Fixing screw for remote controller holder
3.5 × 16 mm (Black) 2
(7) Battery (AAA) for wireless remote controller 2
OBH782A

4
ACCESSORIES
MS-CP18VA MS-CP24VA
Model MS-CP18VA
MS-CP24VA
(1) Installation plate 1
(2) Installation plate xing screw 4 × 25 mm 7
(3) Wireless remote controller 1
(4) Felt tape (For left or left-rear piping) 1
(5) Remote controller holder 1
(6) Fixing screw for remote controller holder
3.5 × 16 mm (Black) 2
(7) Battery (AAA) for wireless remote controller 2
Horizontal vane
Air outlet
Air filter
(Nano platinum filter)
Air inlet
Heat exchanger
Front panel
Air cleaning filter
(Electrostatic anti-al-
lergy enzyme filter,
option)
Remote controller
Display section
Operation indicator lamp
Remote control
receiving section
Emergencyoperation switch
OBH782A

5
MS-CP30VA
ACCESSORIES
Remote controller
Display section
Operation indicator
lamp
Remote control
receiving section
Emergency operation
switch
Horizontal vane
Air outlet
Air filter
(Nano platinum filter)
Air inlet
Front panel
Air cleaning filter
(Electrostatics anti-allergy
enzyme filter, option)
Fan guard
Model MS-CP30VA
(1) Installation plate 1
(2) Installation plate xing screw 4 × 25 mm 7
(3) Remote controller holder 1
(4) Screw for (3) 3.5 × 16 mm (Black)
3.5 × 16 mm (Black) 2
(5) Battery (AAA) for wireless remote controller 2
(6) Wireless remote controller holder 1
(7) Felt tape (Used for left or left-rear piping) 2
(8) Charge nut 1
(9) L-Joint pipe 1
OBH782A

6
SPECIFICATION
3
Indoor model MS-CP13VA MS-CP18VA MS-CP24VA MS-CP30VA
Function Cooling
Power supply Single phase 220-230-240 V, 50 Hz
Electrical
data
Running current A 0.33 0.53 0.58 0.61
Power input W 34 62 70 70
Fan motor
Model RC0J40-EF RC0J56-AF RC0J56-AJ
Current A 0.33 0.53 0.58 0.61
Dimensions W × H × D mm 799 × 290 × 232 1,100 x 325 x 238 1,170 x 365 x 295
Weight kg 10 16 18
Special remarks
Air direction 5
Airow
Super High
m3/h
828 1,320 1,380 1,549
High 660 1,110 1,122 1,392
Med. 522 930 954 1,146
Low 396 786 822 924
Sound level
Super High
dB (A)
47 53 53 53
High 42 46 47 47
Med. 36 41 42 42
Low 29 35 37 37
Fan speed
Super High
rpm
1,270 1,290 1,340 1,200
High 1,070 1,120 1,130 1,100
Med. 900 970 990 940
Low 740 840 870 790
Fan speed regulator 4
Remote controller model KM15D KM16A
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: 7.5 m
OBH782A

7
Unit: mm
OUTLINES AND DIMENSIONS
4
Unit: mm
MS-CP13VA
2325
69
41
799
785 7
290
12063049
57
80
42
43
69
57
42
7
103
130
100
(57°)
225 225 80.5 80.5
61.5 59.5340338
41
42
249
248
21.5
3
167 157
207.5
206.5
172
14
46
Air in
Installation plate
Piping
Drain hose
Air out
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Φ65
159
19
58
Piping
Insulation Φ37 O.D
Liquid line Φ6.35 - 0.39m (Flared connection Φ6.35)
Gas line Φ9.52 - 0.34m (Flared connection Φ12.7)
Drain hose
InslationΦ29 Connected part Φ16 O.D active length 370
1090 5
1100
45 238.5
258.5
3
280
225 225
129
239.5
281
44
49.5 500.5 439.5
199.5199.5
110.5
65
63
76 843 181
65
65
30
63
65
67
63
325
3
100
125
160
110
( 70° )
238
5
210
21.5
184
12
Piping
Insulation Ø50 O.D
Liquid line Ø9.52 - 0.5m (Flared connection Ø6.35)
Gas line Ø12 - 0.43m (Flared connection Ø15.88)
Drain hose Inslation Ø29 Connected part Ø16 O.D
Air out
Piping
Drain hose
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Ø 75
Air in Installation plate
159
19
58
MS-CP18VA MS-CP24VA
OBH782A

8
Unit: mm
MS-CP30VA
159
19
58
Required Space (Indoor Unit)
In case of left, left back,
or left under piping (using spacer) 130 or more
Piping Insulation
Insulation 29 Connected part 16 O.D
Drain hose
Indoor unit
Drain hose
Piping
Installation plate
Air out
Air in
Wall hole 75
15.88 - 0.4m
Joint connection 15.88-0.4m
Flared connection 19.05
9.52 - 0.5m
(Flared connection 9.52)
31 O.D
15 I.D
50 O.D
32 I.D
85574 241
150.5
65
1155
1170
365
67.7
47
55 531 449 136
2.5
47 296 22
119.5
66
75
120 or more 220 or more
107.3 or more
10 or more
236.5 or more
55 or more 368 or more
72 or more
5
295
Liquid line
Gas line
OBH782A

9
WIRING DIAGRAM
5
MS-CP18VA MS-CP24VA
MS-CP13VA
MS-CP30VA
OBH782A

10
Unit: mm
REFRIGERANT SYSTEM DIAGRAM
6
MS-CP18VA MS-CP24VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø15.88
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant flow in cooling
MS-CP13VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant flow in cooling
Refrigerant pipe ø12.7
(with heat insulator)
OBH782A

11
Unit: mm
MS-CP30VA
Indoor
heat
exchanger
Joint
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13 (SUB)
Flared connection
Refrigerant pipe
ø 19.05
(with heat insulator)
Refrigerant pipe
ø 9.52
(with heat insulator)
Indoor coil
thermistor
RT12 (MAIN)
Strainer
#50
Joint connection
Flared connection
Refrigerant flow in cooling
OBH782A

12
7-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board. (Refer to 9-7.)
Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by bridging the timer short mode.)
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
OFF/ON (stop/operate)
button 2 or 3 times at first.
After modification, put back
the batteries then press the
RESET button.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modication Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and J2
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 will only accept 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 is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
SERVICE FUNCTIONS
7
MS-CP13VA MS-CP18VA MS-CP24VA MS-CP30VA
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.
J2
J1
OBH782A

13
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the 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.
Operation
If the main power has been cut, the operation settings remain.
After 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.)
How to disable “AUTO RESTART FUNCTION”
Turn OFF the main power for the unit.
Cut the jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 9-7.)
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit 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 can-
celled.
• 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 appliance 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.
MS-CP18/24VA
CN111
CN112
CN152
CN10A
Indoor electronic
control P.C. board
JR77
CN151
MS-CP13VA
JR77
Indoor electronic
control P.C. board
CN10ACN111
CN151
CN112
CN110
MS-CP30VA
JR77
CN151
CN112
CN111
Indoor electronic
control P.C. board
OBH782A

14
WIRELESS REMOTE CONTROLLER
MICROPROCESSOR CONTROL
8
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
MS-CP13VA MS-CP18VA MS-CP24VA MS-CP30VA
MS-CP13VA
MS-CP18VA MS-CP24VA MS-CP30VA
Signal transmitting section
Operation display section
Temperature buttons
Indication of
remote controller
model is on back
OFF/ON (stop/operate) button
LONG
TIME set buttons
forward button
backward button
VANE control button
Off-timer button
LONG button
RESET button
FAN speed control button
Operation select button
ECONO COOL button
WIDE VANE button
On-timer button
CLOCK button
POWERFUL COOL button
Distance of signal :
About 6 m
Beep(s) is (are) heard
from the indoor unit
when the signal is
received.
Signal transmitting section
Operation display section
Temperature buttons
Indication of
remote controller
model is on back
OFF/ON (stop/operate) button
TIME set buttons
forward button
backward button
VANE control button
Off-timer button
RESET button
FAN speed control button
Operation select button
ECONO COOL button On-timer button
CLOCK button
POWERFUL COOL button
Distance of signal :
About 6 m
Beep(s) is (are) heard
from the indoor unit
when the signal is
received.
OBH782A

15
8-1. COOL ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select COOL mode with Operation select button.
(3) Press Temperature buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is
16 - 31°C.
1. Coil frost prevention
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
8-2. DRY ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select DRY mode with Operation select button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention works the same way as that in the COOL mode. (8-1.1.)
8-3. FAN ( )OPERATION
(1) Press OFF/ON (stop/operate) button. OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select FAN mode with Operation select button.
(3) Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate.
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
8-4. “I FEEL CONTROL” ( ) OPERATION
(1) Press OFF/ON (stop/operate) 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 temperature at
start-up of the operation.
• Once the mode is fixed, the mode does not change by the room temperature afterwards.
• Under ON-TIMER ( ) operation, mode is determined as follows:
When the system is stopped by 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
Restart
COOL mode of
“I FEEL CONTROL”
Operation timer chart
Example
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication Operation state Room temperature
MS-CP13/18/24VA MS-CP30VA
The unit is operating to
reach the set temperature
About 2°C or more away
from set temperature
The room temperature is
approaching the set tem-
perature
About 1 to 2°C from set
temperature
Lit
Not lit
OBH782A

16
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.
Operation time chart
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
Restart
COOL or DRY mode of
“ I FEEL CONTROL” that
determined by room
temperature at start-up
of the operation.
(4) The initial set temperature is decided by the initial room temperature.
*1
Mode Initial room temperature
26 °C or more 24 °C
Initial room temperature
minus 2 °C
25 °C to 26 °C
Initial set temperature
DRY mode of
“I FEEL CONTROL”
COOL mode of
“I FEEL CONTROL”
more than 13 °C, less than 25 °C
Initial room temperature
minus 2 °C
*1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of the 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 TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.
Fuzzy control
When 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
cold. So this is called “Fuzzy control” and it works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature does not change.
… To raise the set temperature 1 ~ 2
… To lower the set temperature 1 ~ 2
OBH782A

17
8-5. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE control button.
1
AUTO 1 2 3 4 5 SWING
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the
selected angle.
Confirming of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem-
perature distribution.
Vane angle is fixed to Angle 1.
(8) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, the set temperature is automatically set 2°C higher.
Also the horizontal vane swings in various cycles.
SWING operation makes you feel cooler than the set temperature. So, even though the set temperature is higher,
the air conditioner can keep comfort. As a result, energy can be saved.
To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL
operation:ECONO COOL, VANE control, LONG
(MS-CP18/24/30VA) or POWERFUL button.
(9) POWERFUL COOL( ) operation
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL COOL
mode.
The POWERFUL COOL mode is cancelled automatically 15 minutes after operation starts. To cancel this
operation manually, select a different mode or press one of the following buttons: POWERFUL COOL, OFF/ON (stop/
operate), ECONO COOL, or
FAN speed control button.
( 10 ) LONG MODE ( ) (MS-CP18/24/30VA)
By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller, and the
horizontal vane moves to the position for LONG mode. The remote controller displays “ ”. To cancel this opera-
tion, press one of the following buttons: LONG, VANE control, or ECONO COOL (during cool mode). In the following
example, the vertical vane is set to “ ” (front.).
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OFF/ON (stop/operate) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 3 to 5 (CP13) 4 or 5 (CP18/24/30VA) when the com-
pressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 2 for dew preven-
tion.
(7) SWING ( ) mode
By selecting SWING mode with VANE control button, the horizontal vane swings vertically.
COOL / DRY
Fan speed : Faster
Solid arrow : When the LONG mode is used.
Dotted arrow : When the LONG mode is not used.
OBH782A

18
8-6. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK button.
How to set the current time
(a) Press the CLOCK button.
(b) Press the TIME set buttons ( and ) to set the current time.
• Each time forward button ( ) is pressed, the set time increases by 1 minute, and each time backward button
() is pressed, the set time decreases by 1 minute.
• Pressing those buttons longer, the set time increases/decreases by 10 minutes.
(c) Press the CLOCK button.
(2) Press OFF/ON (stop/operate) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
(a) Press On-timer button( ) during operation.
(b) Set the time of the timer using TIME set buttons ( and ). *
OFF timer setting
(a) Press Off-timer button ( ) during operation.
(b) Set the time of the timer using TIME set buttons ( and ). *
*Each time forward button ( ) is pressed, the set time increases by 10 minutes: each time backward button ( )
is pressed, the set time decreases by 10 minutes.
2. To release the timer
To release ON timer, press On-timer button ( ).
To release OFF timer, press Off-timer button( ).
TIMER is cancelled and the display of set time disappears.
2. Vertical vane (MS-CP18/24/30VA)
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the select-
ed angle.
(SWING)
12 3 4 5 6
Confirming of standard position is performed in the following cases:
(a) OFF/ON (stop/operate) button is pressed (POWER ON).
(b) SWING is started.
(4) SWING ( ) MODE
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller displays
“”. Swing mode is cancelled when WIDE VANE button is pressed once again.
(5) WIDE MODE ( )
By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the
remote controller (*). The remote controller displays “ ”.
*Indoor fan speed becomes faster than setting fan speed on the remote controller even when “ ” or “ ” is selected.
OBH782A

19
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
• OFF timer and ON timer can be used in combination. The set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
PROGRAM TIMER
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE: If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-
celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.
8-7. EMERGENCY/TEST OPERATION
In the case of test run operation or emergency operation, use Emergency operation switch on the right side of the indoor
unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the
remote controller are running down. The unit will start and OPERATION INDICATOR lamp will light up.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High
speed and the temperature control does not work.
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL MODE with a set temperature of 24°C.
The fan speed shifts to Med.
The coil frost prevention works even in the test run or the emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
Emergency operation continues until Emergency operation switch is pressed again or the unit receives any signal from
the remote controller. In the latter case normal operation will start.
NOTE: Do not press Emergency operation switch during normal operation.
Operation mode COOL
Set temperature 24°C
Fan speed Med.
Horizontal vane Auto
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp
MS-CP13/18/24VA MS-CP30VA
EMERGENCY COOL
↓ ↓
STOP
Lit
Not lit
8-8. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
Emergency
operation switch
(E.O. SW)
Emergency operation switch
MS-CP13/18/24VA
MS-CP30VA
OBH782A

20
9-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, 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 P.C. board.
3) When removing the 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 connector housing. DO NOT pull the lead wires.
3. Troubleshooting procedure
1) Check if the OPERATION INDICATOR lamp on the indoor unit is blinking ON and OFF to indicate an abnormality.
To make sure, check how many times the OPERATION INDICATOR lamp is blinking ON and OFF before starting ser-
vice work.
2) Before servicing, verify that all connectors and terminals are connected properly.
3) When the electronic control P.C. board seems to be defective, check for disconnection of the copper foil pattern and
burnt or discolored components.
4) When troubleshooting, Refer to 9-2, 9-3 and 9-4.
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.
Lead wiring Connector housing
<Correct>
<Incorrect>
TROUBLESHOOTING
9
NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microprocessor when batteries are replaced.
This function is equipped to prevent the microprocessor from malfunctioning due to the voltage drop caused by the
battery replacement.
3. Do not use the leaking batteries.
Remove the front lid and insert batteries.
Then reattach the front lid.
MS-CP13VA MS-CP18VA MS-CP24VA MS-CP30VA
RESET button
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
Press RESET button with a thin instrument, and
then use the remote controller.
OBH782A