Mitsubishi Electric MS-GK24VA User manual

Models
MS-GK24VA -KU1 , KU2 , KU2 U
MS-GK30VAT -KU1 , KU2 , KU2 U
MS-GK36VAT -KU1 , KU2 , KU2 U
Outdoor unit service manual
MU-GK∙VA(T) Series (OBH735)
INDOOR UNIT
PARTS CATALOG (OBB734)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TM
SERVICE MANUAL
No. OBH734
REVISED EDITION-B
MS-GK24VA
MS-GK30VAT
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS·····················6
5. WIRING DIAGRAM·····································8
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS······························ 11
8. MICROPROCESSOR CONTROL ················ 13
9. TROUBLESHOOTING······························· 21
10. DISASSEMBLY INSTRUCTIONS················· 36
Revision B:
• MS-GK24VA- KU2 U, MS-GK30/36
VAT-
KU2 Uhave been added.
OBH734 REVISED EDITION-A is void.

2
Revision A:
• MS-GK24VA- KU2 , MS-GK30/36VAT- KU2 have been added.
Revision B:
• MS-GK24VA- KU2 U, MS-GK30/36VAT- KU2 Uhave been added.
MS-GK24VA- KU1
MS-GK30VAT- KU1
MS-GK36VAT- KU1
1. New model
MS-GK24VA- KU1 MS-GK24VA- KU2
MS-GK30VAT- KU1 MS-GK30VAT- KU2
MS-GK36VAT- KU1 MS-GK36VAT- KU2
1. The model name has been changed so as to correspond to standard.
MS-GK24VA- KU2 MS-GK24VA- KU2 U
MS-GK30VAT- KU2 MS-GK30VAT- KU2 U
MS-GK36VAT- KU2 MS-GK36VAT- KU2 U
1. The model name has been changed so as to correspond to standard.
2. Remote controller has been changed. (The setting temperature range has been changed.)
TECHNICAL CHANGES
1
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.
OBH734B

3
PART NAMES AND FUNCTIONS
2
ACCESSORIES
MS-GK24VA MS-GK30VAT
Horizontal vane
Air outlet
Air filter
(Nano platinum filter)
Air inlet
Front panel
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter, option)
Remote controller
Display section
Heat exchanger
Operation indicator lamp
Remote control receiving section
Emergency operation switch
Model MS-GK24VA
MS-GK30VAT
Installation plate 1
Installation plate fixing screw 4 × 25 mm 7
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
OBH734B

4
MS-GK36VAT
Display section
Remote controller
Operation indicator
lamp
Remote control
receiving section
Emergency operation
switch
Horizontal vane
Air outlet
Air ¿lter
(Catechin air ¿lter)
Air inlet
Front panel
Air cleaning ¿lter
(Anti-Allergy
Enzyme Filter, option)
Installation plate
Installation plate fixing screw 4 x 25 mm
Remote controller holder
Screw for 3.5 x 16 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Charge nut
L-Joint pipe
1
7
1
2
2
1
2
1
1
ACCESSORIES
OBH734B

5
SPECIFICATION
3
Indoor model MS-GK24VA MS-GK30VAT MS-GK36VAT
Function Cooling
Power supply Single phase 220 - 230 - 240 V, 50 Hz
Electrical
data
Running current A 0.53 0.56 0.52
Power input W 62 66 70
Fan motor
Model RC0J50-MA RC0J56-AC
Current A 0.53 0.56 0.52
Dimensions W × H × D mm 1,100 x 325 x 238 1,170 x 365 x 295
Weight kg 16 16 18
Special remarks
Air direction 5
Airflow
Super High
m3/h
1,320 1,296 -
High 1,122 1,134 1,392
Med. 930 972 1,146
Low 744 828 924
Sound level
Super High
dB (A)
53 -
High 47 50
Med. 42 44
Low 37 39
Fan speed
Super High
rpm
1,290 1,340 -
High 1,130 1,200 1,100
Med. 970 1,060 940
Low 810 930 790
Fan speed regulator 4 3
Remote controller model
KU1 , KU2 : KM14A KU1 , KU2 : KM15G
KU2 U: KM17C KU2 U: KM17B
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
OBH734B

6
Unit: mm
OUTLINES AND DIMENSIONS
4
MS-GK24VA
MS-GK30VAT
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
MS-GK24VA Ø50 O.D
Liquid line Ø9.52 - 0.5m (Flared connection Ø6.35)
Gas line Ø12 - 0.45m (Flared connection Ø15.88)
Drain hose Insulation Ø28 Connected part Ø16 O.D
Piping
Insulation
MS-GK30VATØ50 O.D
Liquid line Ø9.52 - 0.5m (Flared connection Ø9.52)
Gas line Ø12 - 0.45m (Flared connection Ø15.88)
Drain hose Insulation Ø28 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
OBH734B

7
Unit: mm
MS-GK36VAT
159
19
58
Wireless remote controller
Required Space (Indoor Unit)
In case of left, left back,
or left under piping (using spacer) 130 or more
Piping Insulation
Insulation 28 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
OBH734B

8
WIRING DIAGRAM
5
MS-GK24VA- KU1 , KU2 , KU2 UMS-GK30VAT- KU1 , KU2 , KU2 U
MS-GK36VAT- KU1
MS-GK36VAT- KU2 , KU2 U
OBH734B

9
Unit: mm
REFRIGERANT SYSTEM DIAGRAM
6
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø15.88
(with heat insulator)
Refrigerant pipe ø9.52
(with heat insulator)
Indoor coil
thermistor
RT12
Refrigerant flow in cooling
MS-GK30VAT
MS-GK24VA
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
OBH734B

10
MS-GK36VAT
Indoor
heat
exchanger
Joint
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13 (SUB)
Flared connection
Refrigerant pipe
19.05
(with heat insulator)
Refrigerant pipe
9.52
(with heat insulator)
Indoor coil
thermistor
RT12 (MAIN)
Strainer
#50
Joint connection
Flared connection
Refrigerant flow in cooling
OBH734B

11
7-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS 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 JPG and JPS.)
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
OPERATE/STOP (ON/OFF)
(MS-GK24VA- KU1 , KU2 /
GK30VAT- KU1 , KU2 )/ STOP/
OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/
GK30VAT- KU2 U/
MS-GK36VAT) button 2 or 3
times at first.
After modification, put back
the batteries then press the
RESET button.
J2
J1
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification 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-GK24VA MS-GK30VAT MS-GK36VAT
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.
OBH734B

12
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.
Solder the jumper wire to JR07 on the indoor electronic control P.C. board (MS-GK36VAT).
Cut the jumper wire to JR77 on the indoor electronic control P.C. board (MS-GK24VA/GK30VAT). (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-GK24VA/GK30VAT MS-GK36VAT
CN111
CN112
CN152
CN10A
Indoor electronic
control P.C. board
JR77
CN151
JR07
CN151
CN152
CN101
CN211CN112
BZ
OBH734B

13
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-GK24VA MS-GK30VAT
MS-GK36VAT
Signal transmitting section
Operation display section
Temperature buttons
OPERATE/STOP(ON/OFF)
button ( , ) /
STOP/OPERATE(OFF/ON)
button ( )
Indication of
remote controller
model is on back
LONG
TIME SET buttons
FORWARD button
BACKWARD button
VANE CONTROL button
(Horizontal vane button)
OFF-TIMER button
LONG button
RESET button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
WIDE VANE button
(Vertical vane button)
ON-TIMER button
CLOCK SET button
POWERFUL COOL button
KU1 KU2
KU2 U
Signal transmitting section
Operation display section
Temperature buttons
STOP/OPERATE
(OFF/ON) button
Indication of
remote controller
model is on back
LONG
TIME SET buttons
FORWARD button
BACKWARD button
VANE CONTROL button
(Horizontal vane button)
OFF-TIMER button
LONG button
RESET button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
WIDE VANE button
(Vertical vane button)
ON-TIMER button
CLOCK SET button
MS-GK24VA MS-GK30VAT MS-GK36VAT
OBH734B

14
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 indicatior.
Indication
Operation state Room temperature
MS-GK24VA
MS-GK30VAT MS-GK36VAT
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 away from
set temperature
INDOOR UNIT DISPLAY SECTION
8-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) 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 (MS-GK24VA- KU1 , MS-GK24VA- KU2 , MS-GK30/36VAT- KU1 , MS-GK30/36VAT- KU2 )/
20 - 31°C (MS-GK24VA- KU2 U, MS-GK30/36VAT- KU2 U).
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 OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) 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 COOL mode. (8-1.1.)
However, when coil frost prevention works while the compressor is not operating, its speed becomes Low. (MS-GK36VAT)
8-3. FAN ( )OPERATION
(1) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) 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 OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) 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 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.
Lighted
Not lighted
OBH734B

15
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
Restart
COOL mode of
“I FEEL CONTROL”
Operation timer chart
Example
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 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
Mode Initial room temperature Initial set temperature
COOL mode of
“I FEEL CONTROL”
26°C or more 24°C
1
25°C to 26°C Initial room temperature
minus 2°C
DRY mode of
“I FEEL CONTROL” more than 13°C, less than 25°C Initial room temperature minus 2°C
OBH734B

16
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:
MS-GK24VA MS-GK30VAT
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
MS-GK36VAT
(a) When the power supply turns ON.
(b) When the operation starts or finishes (including timer operation).
(c) When the test run starts.
(d) When the vane control is changed AUTO to MANUAL (except SWING).
(e) When SWING is finished (including ECONO COOL).
(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.
(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller
displays “ ”.
(8) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher.
Also the horizontal vane swings in various cycles.
SWING operation makes you feel cooler than 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 or POWERFUL COOL
(MS-GK24VA MS-GK30VAT) button.
NOTE : ECONO COOL operation does not work in COOL mode of “I FEEL CONTROL”.
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U /GK30VAT- KU2 U/ MS-GK36VAT) 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 4 or 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(9) POWERFUL ( ) operation (MS-GK24VA MS-GK30VAT)
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.
The POWERFUL mode is cancelled automatically 15 minutes after operation starts. To cancel this operation manual-
ly, select a different mode or press one of the following buttons: POWERFUL, OPERATE/STOP (ON/OFF), ECONO
COOL, or
FAN, SPEED CONTROL button.
OBH734B

17
2. Vertical vane (MS-GK24VA/GK30VAT)
(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 CONTROL 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)
123 456
Confirming of standard position is performed in the following cases:
(a) OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U) 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 dis-
plays “ ”. 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.
COOL / DRY
Fan speed : Faster
Solid arrow : When the LONG mode is used.
Dotted arrow : When the LONG mode is not used.
( 10 ) LONG MODE ( )
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 fol-
lowing example, the vertical vane is set to (front.).
OBH734B

18
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.
1. How to set the timer
(1) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/ STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) button.
(2) 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.
(3) Press OPERATE/STOP (ON/OFF) (MS-GK24VA- KU1 , KU2 /GK30VAT- KU1 , KU2 )/STOP/OPERATE (OFF/ON)
(MS-GK24VA- KU2 U/GK30VAT- KU2 U/MS-GK36VAT) button to start the air conditioner.
(4) 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 but-
ton ( ) is pressed, the set time decreases by 10 minutes.
8-6. TIMER OPERATION
61 23 45SWING
2. Vertical vane (MS-GK36VAT)
(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 12V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing the 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 desired
angle. Confirming of standard position is performed in the following cases:
(a) When STOP/OPERATE (OFF/ON) button is pressed (POWER OFF or ON).
(b) When SWING is started or finished.
(c) When the power supply turns ON.
(4) SWING MODE ( )
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller displays
“”. The vane moves right and left in the width of Angle 4 repeatedly.
(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.
About 100
Horizontal AIR FLOW blowing range
OBH734B

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.
OBH734B

20
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.
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
EMERGENCY COOL

STOP
Lighted
Not lighted
MS-GK24VA MS-GK30VAT
EMERGENCY OPERATION switch
MS-GK36VAT
EMERGENCY OPERATION switch Press once <Cool>
Press again <Stop>
Operation indicator lamp
7KHIROORZLQJLQGLFDWLRQDSSOLHV
UHJDUGOHVVRIVKDSHRIWKHLQGLFDWRU
Lighted
Not lighted
OBH734B