Ok ,it has been 14 years since I've had to wire this type stuff up so I'm rusty along with a 2000yd stare! i'm placing a heat dump on my boiler (temporary, till I get more of my heating setup) I plan to place unit heater in my shop and tag off my boiler loop lines that run 24/7 . I have a couple AQ st's on hand I plan to strap a AQ on the main line coming off the boiler and setting it at 195/10 that would send a signal to my z valve in the shop to open ...then? turn on the fan (120v) and running it till the ex-heat dumps 10 degs I have 24v in both shop and boiler shed along with 120v. funny how I can wire a everything> 3 and 4ways switch's/outlets etc in all of my entire 2600 sf house > but get lost in this