WARNING: Do not use this thermostat for freeze protection.
In cold climates that require the heating system to be used for building freeze protection, a mechanical backup
freeze protection device must be installed on the heating system. This can be a simple mechanical heating
thermostat or a preset thermoswitch installed in the heated area (Figure 15).
Figure 15. Freeze protection
40 to 45°
24 VAC R
Wire across heater R/W terminals