Frost Protection on VisionPro IAQ Tstat

[ramlam]

What does the 'frost index' represent on a VisionPro IAQ and what does the tstat do when you set it higher or lower? How does it relate to the relative humidity setting, e.g. what happens if I put 60% humidity and a 1 for the frost index?

I was thinking the frost protection feature would simply determine the optimal humidity level based on the outside temp, but that does not seem to be the case. I can't find any detail information on this feature in the user guide or on the Internet.

[RSweeney]

The IAQ, when used with an outdoor temp sensor, can automatically lower the RH setpoint on cold days to prevent the windows from frosting up (not to mention the condensation of rot-causing moisture in the walls).

Doesn't do anything unless you have a humidifier attached.

[ramlam]

Thanks!