Zoneline - Freeze Sentinel

Freeze Sentinel comes from the factory turned off; however, when Freeze Sentinel is activated, it automatically provides heat without any action by the user if the temperature drops too low. This helps to prevent plumbing damage by turning the heater and indoor fan on at 41ºF and off again at 46ºF. These functions are active whenever the unit is plugged in, even if the unit is in the STOP/OFF position.