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8.3. Automatic Operation
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Automatic operation can be set using remote control.
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This operation starts to operate with indoor fan at SLo speed for 20 seconds to judge the intake air temperature.
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After judged the temperature, the operation mode is determined by referring to the below standard.
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Then, the unit start to operate at determined operation mode, until it is switched off using remote control, with the setting
temperature as shown in below table.
temperature as shown in below table.
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The setting temperature for all the operations can be changed one level up or one level down from the standard temperature
as shown in below table by pressing on the temperature up or temperature down button at remote control.
as shown in below table by pressing on the temperature up or temperature down button at remote control.
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The operation mode judging temperature and standard setting temperature can be increased by 2°C permanently, by open the
circuit of JX1 at indoor electronic controller.
circuit of JX1 at indoor electronic controller.
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8.4. Operation Control
8.4.1. Restart Control (Time Delay Safety Control)
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When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
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Cooling/Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.
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Soft Dry operation - the compressor stops for 6 minutes (minimum) before resume operation.
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If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation
stop, although the unit is turn on again within the period.
stop, although the unit is turn on again within the period.
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This phenomenon is to balance the pressure inside the refrigerant cycle.
(For 8.5.3. to 8.5.6. information applies only to Cooling and Soft Dry Operation)
8.4.2. 7 Minutes Time Save Control
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The compressor will start automatically if it has stopped for 7 minutes and the intake air temperature falls between the
compressor ON temperature (A) and compressor OFF temperature (B) during the period.
compressor ON temperature (A) and compressor OFF temperature (B) during the period.
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This phenomenon is to reduce the built up humidity inside a room.
8.4.3. 60 Seconds Forced Operation
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Once the air conditioner is turned on, the compressor will not stop within 60 seconds in a normal operation although the intake
air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.
air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.
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The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and
return back to the outdoor unit.
return back to the outdoor unit.
8.4.4. Starting Current Control
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When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to
operate at 1.6 second later.
operate at 1.6 second later.
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The reason of the difference is to reduce the starting current flow.
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8.4.5. Anti-Freezing Control
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If the temperature of the indoor heat exchanger falls below 2°C continuously for 4 minutes or more, the compressor turns off.
The fan speed setting remains the same.
The fan speed setting remains the same.
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This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form
returning to the compressor.
returning to the compressor.
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Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).
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Restart control (Time Delay Safety Control) will be applied in this Control if the recovery time is too short.
8.4.6. Compressor Reverse Rotation Protection Control
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If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and
indoor heat exchanger is 2.5°C or less for continuous 2 minutes, compressor will stop and restart automatically.
indoor heat exchanger is 2.5°C or less for continuous 2 minutes, compressor will stop and restart automatically.
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Time Delay Safety Control is activated before the compressor restart.
s T = Intake air temperature - Indoor heat exchanger temperature
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This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
8.4.7. Anti-Dew Formation Control
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Purpose is to prevent dew formation on indoor unit discharge area.
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When room temperature is constant (±1°C) the following condition occur for 30 minutes continuously, anti-dew formation will
activate:
- Indoor intake temperature is more than 24°C and less than 30°C.
- Remote Control setting temperature is less than 25°C.
- Compressor is on.
- Cooling Operation Mode.
- Indoor fan motor operate at Low fan speed or QLo.
activate:
- Indoor intake temperature is more than 24°C and less than 30°C.
- Remote Control setting temperature is less than 25°C.
- Compressor is on.
- Cooling Operation Mode.
- Indoor fan motor operate at Low fan speed or QLo.
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Anti-Dew Formation is control by:-
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Increasing Air Flow Volume
1. Lo fan speed.
1. Lo fan speed.
Lo fan speed is changed to Lo+ after 30 min to prevent dew formation.
2. QLo fan speed.
Dew formation may occur at QLo cool, therefore QLo cool is operated only 1hr 30min (1 hr QLo, 30 min QLo + 80 rpm). After
that, it operates at QLo + 160 rpm (However Quiet LED remains on).
that, it operates at QLo + 160 rpm (However Quiet LED remains on).
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Narrowing
1. Vertical Airflow Direction
1. Vertical Airflow Direction
During Anti-Dew condensation prevention, Airflow Direction Auto-control angle from 0° - 32° to 20° - 30° under cooling and
Soft Dry operation mode.
Soft Dry operation mode.
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