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–17–

Ts : Setting Temperature
Tr : Room Temperature
Ti : Indoor defrost sensor temperature

• If Tr > Ts cool operation is activated. Compressor and outdoor fan are turned on. Indoor fan is started at the

previously set speed.

• If Tr  

≤

Ts-1°C, cool operation is terminated. Compressor and outdoor fan are turned off. Indoor fan keeps

running at the set speed.

• The range of Ts is 15~30°C.
• Indoor fan speed can be adjusted for low, medium, high and auto.

2.1.1 Delay protection of compressor in normal operation.

3 minutes before it is turned on or off

2.1.2 Indoor de-ice
This process is checked by the indoor defrost sensor (Ti). After the compressor has
worked for 45 minutes, if Ti 

≤

0°C for 3 minutes continuously, compressor and outdoor fan

are turned off. Indoor fan keeps running at the set speed. When Ti 

≥

8°C or indoor de-ice

operation is on for more than 8 minutes, system will return to normal operation.

• Indoor fan runs at the set speed while compressor and outdoor fan are turned off.
• Indoor fan speed can be adjusted for low, medium and high. The initial speed is medium.

• If Tr < Ts, heat operation is activated. Compressor and outdoor fan are turned on. The indoor fan is started

approximately 10 seconds later.

• If Tr. 

≥

Ts + 1°C, heat operation is terminated. Compressor and outdoor fan are turned off. The indoor fan

keeps running approximately 100 seconds.

• The range of Ts is 15~30°C.
• Indoor fan speed can be adjusted for low, medium, high and auto.
• Compressor will delay for 3 minutes before it is turned on or off.

2.3.1 Delay protection of compressor in normal operation

3 minutes before it is turned on or off.

–18–

2.3.2 Outdoor de-ice
After 45 minutes of continuous heating operation, if To 

≤

-8°C, the outdoor de- ice operation is activated. Com-

pressor, outdoor fan and indoor fan are turned off.
After 90 seconds delay, 4 way valve will be turned off, 5 seconds later, the compressor is turned on for the de-
ice operation. If To 

≥

8°C or 8 minutes has elapsed, the de-ice operation will be terminated. Then, the com-

pressor is turned off. After 90 seconds delay, 4 way valve is turned on. 5 seconds later, compressor and out-
door fan are turned on for return to normal operation. Indoor fan starts after 15 seconds has elapsed.

2.3.3 High pressure protection
If Ti > 56°C, the outdoor fan is turned off, After that, if Ti < 53°C, the system will start again.
If Ti > 62°C, the compressor is turned off.

2.3.4 Pre heat and Post heat
These processes will operate 10 seconds for pre heat and 100 seconds for post heat.

DE-ICE

4WV

ON

ON

OFF

OFF

COMPRESSOR

OUTDOOR FAN

INDOOR FAN

90 SEC

5 SEC

90 SEC

90 SEC

5 SEC

PRE HEAT

15 SEC

ON DE-ICE <= 8 MINUTE

>= 45 MINUTE

OUTDOOR TEMP <= -8 DEGREE

ON DE-ICE MODE

OUTDOOR SENSOR = 8 DEGREE OR

ON DE ICE 8 MINUTE OFF DE ICE MODE

Compressor

Outdoor Fan

(High pressure protection)

62

°

C

56

°

C

Temp increasing

Compressor

Outdoor Fan

Temp decreasing

53

°

C

ON

OFF

OFF

OFF

Compressor

Outdoor Fan

(High pressure protection)

ON

ON

Compressor

Outdoor Fan

Normal Operation Zone

ON

ON

Compressor

Outdoor Fan

Normal Operation Zone

ON

ON

–19–

• Timer off can only be set when the system is operating.
• Timer on can only be set when the system is off.
• The maximum set time is 24 hours.
• Changing of On/off State will cancel timer mode.

• Sleep mode can only be set in cool and heat mode.
• In cool mode, after sleep mode is set, Ts will increase 1°C each hour for 2 hours.
• In heat mode, after sleep mode is set, Ts will decrease 1°C each hour for 2 hours.
• Changing of operation mode will cancel sleep mode.

• In cool mode, if Tr-Ts < 2°C, indoor fan is run at low speed. 

if 2°C < Tr-Ts < 3°C, indoor fan is run at medium speed.
if Tr-Ts > 3°C, indoor fan is run at high speed.

• In heat mode, if Ts-Tr < 2°C, indoor fan is run at low speed. 

if 2°C < Ts-Tr < 3°C, indoor fan is run at medium speed.
if Ts-Tr > 3°C, indoor fan is run at high speed.

Tr=Ts-2

Tr=Ts-1

Ts

Ts

HEAT MODE

COOL MODE

Tr=Ts+1

Tr=Ts+2

START
SLEEPMODE

1 Hr

2 Hrs

Time

°

C

ROOM SENSOR (Tr)

LOW SPEED

Tr=Ts+3

Tr=Ts+2

Tr=Ts

MEDIUM SPEED

HIGH SPEED

 

–20–

•There is no auto fan speed in fan mode.

• If the indoor fan is operating, the louver will swing or can be stopped at a preferred location in any mode.

• If a command is received, the system will respond with a beep.

The system uses non-volatile memory to save the present operation parameters when
system is turned off or in case of system failure or cessation of power supply. Operating
parameters are mode, set temperature, and fan speed. When power supply resumes or the
system is switched on again, the same operation parameters, as previously set will function.

• This is a double-position slide switch. One position is for cool mode and the other for heat mode. Select posi-

tion before turneing the system on by pressing on/off button.

• In cool mode, the set temperature of the system is 25°C with medium fan speed and swing. There are no

timer and sleep modes.

• In heat mode, the set temperature of the system is 20°C with medium fan speed and swing. There are no

timer and sleep modes.

• This is a light touch button.
• Every press of this button will turn the system on or off.

• When system is operating, the light is on. When system is off, the light is off.
• If timer on or off is set, the light will blink on 1 second and off 3 seconds.
• When IR signal is received, the light blinks once.

ROOM SENSOR (Tr)

LOW SPEED

Tr=Ts

Tr=Ts-2

Tr=Ts-3

MEDIUM SPEED

HIGH SPEED