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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
WARNING: Do not use this thermostat for freeze protection.
Mechanical thermostat
or thermoswitch
Heating system
24 VAC R
Heat W
Red wire
White wire
Thermostat
connections
R
W
40 to 45°
Wire across heater R/W terminals