SiAU18-715 Protection Control
Function 93
4.5 Freeze-up Protection Control
Outline According to the freeze prevention status sent from the BP unit. The compressor output
frequency is regulated to decrease the compressor capacity in order to prevent the indoor heat
exchanger from freezing.
Detail Zones are produced based on the freeze prevention status signal sent from the BP unit (Indoor
unit), and the freeze prevention control prevents freezing of the indoor unit.
Recovery zone: Lift the control
Increase zone: 1 step up/60sec.
Keep zone: Frequency is not controlled
Decrease zone: 1 step down/60sec.
Stop zone: Thermostat-OFF (only the target indoor unit)
The temperature in above figure depends on models. (Reference value)
˚C
13
7
5
3
0
Recovery zone
Increase zone
Keep zone
Decrease zone
Stop zone
Indoor unit heat exchanger
temperature
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