13.5 Freeze Prevention Control
•To protect indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form return to compressor.
•This control will activate when temperature of indoor heat exchanger falls below 2°C continuously for more than 4 minutes and compressor turn off.
Indoor Heat |
|
Exchanger |
|
Temperature |
|
(°C) | Recovery |
10 | |
| 4 min |
2 |
|
| Compressor OFF |
•Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).
•Restart control (Time Delay Safety Control) will be applied in this control if the recovery time is too short.
13.6 Compressor Reverse Rotation Protection Control
•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 continuously 2 minutes, compressor will stop and restart automatically.
•Time Delay Safety Control is activated before the compressor restart.
Compressor starts for ≥ 5 minutes |
| Compressor |
▲T ≤ 2.5°C for 2 minutes |
| OFF |
|
|
|
▲T = Intake air temperature – Indoor heat exchanger temperature
Compressor
restart
•This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
•If this condition happens continuously for 5 times within 50 minutes, unit will turn OFF with TIMER LED blinks.
•The 5 Times counter can be reset when either one of the following condition happen: o Unit is OFF by remote control or AUTO OFF/ON button.
o Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more. o Operation mode change.
•The unit could be ON by pressing OFF/ON button at remote control but the TIMER LED will continue blinking.
•TIMER LED blinking will be reset if:
o Indoor intake temperature – Indoor piping temperature > 5°C for one minute or more. o Power supply reset.
13.7 Dew Prevention Control
•To prevent dew formation at indoor unit discharge area.
•This control starts if:
o Cooling mode or Quiet mode is activated.
o Remote Control setting temperature is less than 25°C. o Fan speed is at CLo or QLo.
o Room temperature is constant (±1°C) for 30 minutes. o Compressor is continuously running.
•Fan speed will be adjusted accordingly in this control.
o Fan sped will be increased slowly if the unit is in quiet mode and Lo fan speed.
•Dew prevention stop condition.
o Remote control setting temperature is more than 25°C. o Fan speed is not at Lo or QLo.
o Select Powerful operation.
50
