There is not an internal stat it's only to turn it on and adjust the speed should you want to override the thermostat for keeping it on all the time. You pull down on the manual crank hand and then open past the plunger switch.
There is also a rain sensor in mine which will shut it down in the event of rain, but I have a vent cover eliminating that possibility.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's