You also need to check the owner manual for the pump, or its onboard controller. My Pentair system has two independent freeze protections. One provided by my automation controller, similar to what you're discussing above, and the other is built into the pump. My pump's freeze protection will override my controller's settings, even if the controller's freeze protection is off. My pump does have settings that can be adjusted, but they are not accessed via the controller's interface, but rather through the pump's interface. So if you have a VS pump with it's own onboard controller, you need to see if that, too, has its own freeze protection and adjustments. Without your pump's specific model number, we can't help with that.