If in the system an outdoor temperature probe is configured in the Configuration 1 page, this may be used to determine the activation of antifreeze mode.

Specifically, when the outdoor temperature falls below the value set by the Antifreeze Set on Outdoor Temperature, the antifreeze mode is activated; the mode is deactivated if the outdoor temperature rises by at least as many degrees as set by the Antifreeze Hysteresis parameter on Outdoor Temperature above the activation value: