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• During Operation, press "Economy" button at remote control to enable Energy Saving Operation.
• The air conditioner judges the stable condition, where the different between indoor suction temperature and setting temperature

is 1°C for 30 minutes and moderately shifts the set temperature in 0.5°C steps (Maximum 2°C) to control energy saving opera-
tion.

• If temperature different is out of range, energy save operation will not start.
• Energy Save Operation is canceled by pressing the "Economy" button again.

• During Cooling or Soft Dry operation, if outdoor temperature is less than 30ºC, and indoor fan speed is low or auto setting, indoor

heat exchanger temperature become lower, dew form prevention control start to prevention dew form at indoor discharge grille.

• When indoor pipe temperature decrease, the cooling capacity will be reduced and the louver angle will be fixed at certain angle.

• After compressor starts operation for 4 minutes, the outdoor unit will stop its operation if indoor pipe temperature falls below 0ºC

for 6 minutes.

• After 3 minutes stops, compressor restarts operation if indoor pipe temperature is 6ºC or more.
• This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid from

returning to the compressor.

• During heating operation at outdoor low outdoor temperature, deice operation start timely to melt the ice formed on outdoor heat

exchanger.

• During deice operation, in spite of any changes of remote control, indoor fan stop and louver angle fixed at upper side. (for louver

control: cassette and ceiling model only)

• During deice operation, [DEFROST] is displayed at wired remote control (when using wireless control, POWER is blinking at

receiver of indoor unit), hot start operate after deice operation finish.

• Deice operation start when accumulative heating operation time or after previous defrost end reaches 45 minutes, the outdoor

fan maintains Hi status and the outdoor heat exchanger maintains -2°C for 5 minutes.

Energy save control time chart

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• The compressor will not start for three minutes after stop of operation.

• When compressor stop, outdoor fan operates at High speed for 1 minute to remove the remaining heat.

• Crank case heater ON when the compressor is shutdown and discharge temperature is 20°C to prevents the refrigerant solving

into compressor oil inside the compressor shell at cold condition.

• During heating operation, when outdoor temperature is more than 35°C for 15 minutes, compressor stops in order to protect the

compressor.

• After 3 minutes (restart delay control) of waiting, if thermostat is ON, outdoor unit restart.

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• To enable pump down operation, at outdoor PCB, set the DS1and DS2 to OFF position.

• Press Test Run button for 1 second.

• During Pump Down operation, push the Test Run button again for 1 second to stop the pump down operation.
• The pump down operation run for 10 minutes.

• Depending on differences between room temperature and setting temperature, compressor operation is decided and starts oper-

ation.

• If temperature difference matches values shown below, thermostat switches off.

Cooling Mode

-1.5

°C

Soft Dry Mode

-2.5

°C

Heating Mode

3.5

°C

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• The purpose of low-pressure protection control is gas leakage detection control.
• The low-pressure protection control starts when low-pressure switch is activated less than 15 minutes after compressor startup.

During heating operation or defrost control low-pressure detection does not start.

• During this protection control, compressor is shut down, indoor unit is set to thermo-off status.
• After 6 occasions, suction pressure error is displayed; all operation stopped except outdoor fan remaining heat removal control.

• The high-pressure protection control starts when high-pressure switch is activated less than 15 minutes after compressor star-

tup.

• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 6 occasions, high-pressure protection error is displayed; all operation stopped except outdoor fan remaining heat removal

control.

• The discharge temperature protection control starts when abnormal compressor temperature 115°C is detected when outdoor

unit is operating in cooling or heating operation.

• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 6 occasions, high-pressure protection error is displayed; all operation stopped except outdoor fan remaining heat removal

control.

• The purpose of over current protection control is to protect the air conditioner from over current.
• The over current protection control starts when input current from CT is maintained at 20A or more for 2 seconds when the out-

door unit is starting up or during cooling or heating operation.

• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 4 occasions, over current protection error is displayed; all operation stopped except outdoor fan remaining heat removal

control.

• CT disconnection detection control detects if the CT sensor works normally.
• The CT disconnection detection activates when:

- CT input value is maintained at compressor shutdown status (1.5A or less) consecutively for 2 seconds when the compressor

is operating; except deice mode. 

- During this condition, compressor is shut down and indoor unit is set to thermo-off status.
- After 4 occasions, CT sensor error is displayed; all operation stopped except outdoor fan remaining heat removal control.

- CT input value is maintained at compressor operation status (5A or more) consecutively for a period of 60 seconds when the

compressor is shut down.

- During this condition, CT sensor error is displayed.

• The purpose of connection capacity protection control is to ensure the total capacity of connected indoor units is within accept-

able range.

• During this protection control, connection capacity error is displayed; all operations stopped.

• The sensor disconnection detection control activates when the following condition comply:

• During sensor disconnection, sensor error is displayed; all operations stops except outdoor fan remaining heat removal control.

Model Number

Min. Capacity (kW)

Max. Capacity (kW)

Model Number

Min. Capacity (kW)

Max. Capacity (kW)

CU-B14DBE5

5.3

6.9

CU-B28DBE8

6.3

9.8

CU-B18DBE5

5.3

6.9

CU-B34DBE8

7.3

12.3

CU-B24DBE5

6.3

9.8

CU-B43DBE8

10.2

13.8

CU-B28DBE5

7.3

12.3

CU-B50DBE8

12.7

15.8

Sensor

Detection Threshold

Duration (Sec)

Detection Condition

Discharge Temperature

< -4.5

°C or 201.8°C

5

Other than compressor start control

and compressor ON

Outdoor Heat Exchanger

< -50.5

°C or 103.7°C

5

Regularly