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- 14 -

• Deicing operation is controlled by timer and sensing the outdoor piping temperature in heating operation mode.

• The first deicing starts when 60 minutes or more passed after starting of heating operation and the outdoor

piping temperature is -6°C or lower. 

• Deicing ends after 12 minutes or when the outdoor piping temperature is 12 or higher.

• Heating operation is repeated automatically 60 min. Heating and 12min. Deicing after the first deicing ends.

• The operation diagram is as following.

• In deicing operation, only solenoid valve of the indoor unit operated at that time is ON.

• If you lose wireless remote controller, you can operate the unit with forced operation switch.
• When you operate the unit with forced operation switch, the unit isn't always operated in operation mode which

you desire. So you can operate in uour operation mode by only remote controller.

• The standard conditions are as following :

The outdoor

piping Temp.

12°C

DEICING OFF

-6°C 

DEICING ON

COMPRESSOR

4-WAY VALVE

ON

INDOOR FAN

ON

OUTDOOR FAN

ON

ON

ON

ON

ON

ON

LOW

MORE THAN

60MINS

Deicing

Deicing

12MINS

60MINS

12MINS

30 SEC

OFF

OFF

ON

OFF

OFF

OFF

OFF

OFF

Selecting

fan speed

Cooling

Model

Operation Mode

FAN Speed

Setting Temp.

Heat pump

Room Temp 

≥

24°C

21°C 

≤

Room Temp < 24°C

Room Temp <21°C

Cooling

Cooling

Soft Dry

Heating

High

High

High

High

24°C

24°C

25°C

22°C

- 15 -

• In order to raise the efficiency of dehumidify, "Restarting temperature of compressor operation" set higher 1°C

than setting temperature.

• When room temperature is higher than "Restarting temperature of compressor operation", it will be operate by

fan speed setting.

• When room temperature reach "Stopping temperature of compressor operation", the fan and the compressor

will be stop. After 5mins passed, only fan start to operate in low mode for 2 min.

• When room temperature is between "Restarting temperature of kcompressor operation" amd "Stopping

temperature of compressor operation", operate micom dehumidify mode for 10 mins and fan operate low
speed.

• Fan will be stop after 10mins passed to operate imcom dehumidify or below or "Stopping temperature of com-

pressor operation" after 4 mins.

• When 5 mins passed after stopping compressor, fna start to low mode and 7 mins passed after stopping,

compressor start to operate micom dehumidify again. (When micom dehumidify operate, fan will operate at
low speed.)

• When room temperature is below of "Stopping temperature of compressor operation", fan will stop 5 mins and

operate 2 min in low mode.

• In micom dehumidify mode, control of fan speed is as following.

ROOM TEMP.

COMP ON

(SET TEMP. +1°C)

COMP. OFF

(SET TEMP. -1°C)

INDOOR FAN

COMPRESSOR

ON 

OFF

ON

ON

OFF

ON

2MINS

5MINS

5MINS

5MINS

10MINS

10MINS

MAX 4MINS

10MINS

OPERATION
COOLING

DELAY 3 MINS

OPERATION

COOLING

2 MINS

2MINS

MAX

OFF

FAN SPEED

SETTING

LOW

LOW

LOW

LOW

OFF

OFF

OFF

LOW

LOW

- 16 -

When all units (A-Unit, B-Unit, C-Unit) are operated simultaneously, if each unit is not operated in the same
mode of the unit operated at first, it is not operated.

If operating mode of a unit is different from mode of the unit operated at first, operating LED will be blinking 3
times, besides the indoor and outdoor fan and the compressor will be off.

After A-Unit operates in cooling mode at first, B and C-Units operate in heating mode.

¥L

A-Unit

• Cooling mode operation (

¤B

normal display)

¥M

B,C-Unit

• System error operation (

¤B

abnormal display)

After A, B-Unit opertes in heating mode at first, C-Units operate in cooling mode.

¥L

A,B-Unit

• Heating mode operation (

¤B

normal display)

¥M

C-Unit

• System error operation (

¤B

abnormal display)

¡

System error operation : The unit stops operation with blinking operation LED 3 times.

The units are controlled by signal between indoor and outdoor, therefore the unit can be operated incorrectly by
any noise. In this case, you should reoperate the unit by remote controller.

or

- 17 -

Solenoid valve controls mass of liquid flow of each unit.

(1) Before starting condition

• All teh solenoid valves are off.

(2) In operating mode

¥L

Heating operating mode

• After solenoid valve of each unit operated is ON,

the solenoid valve of units not operated also in ON 30 seconds later.

• But the solenoid valve for by-pass is always OFF.

¥M

Cooling operating mode

• Operating single unit: The solenoid valve operated and the valve for by-pass is ON.

• Operating dual unit: The solenoid valve of each unit operated is ON.

• Operating triple unit: The solenoid valve of each unit operated is ON.

(3) Stopping condition

The solenoid valve is off 3 minutes later.

• Outdoor fan is set as control of the compressor. That is, as compressor operated, outdoor fan is operated.

• In heatin goperating mode, if discharge pressure of the compressor has been above 24kg/cm

2

g outdoor fan is

off, but if the discharge pressure has been below 20kg/cm

2

g, the outdoor fan is on.