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Your main furnace has a thermostat in the plenum that tells the fan to run when it gets warm enough in the plenum. No propane is required for this to happen, just electricity and heat. My house works this way, kind of hard to regulate the temp so we open windows(nice to have fresh air). I'm sure you could wire in an additional thermostat that would help regulate but that's over my head.

I don't know if you have to have a certain type of furnace for this but I have three positions on my thermostat switch "HEAT," "AC," and "FAN ON." It's a digital programmable Aprilaire.
 
I don't know if you have to have a certain type of furnace for this but I have three positions on my thermostat switch "HEAT," "AC," and "FAN ON." It's a digital programmable Aprilaire.

Just leave it on heat and turn down the thermostat for the main furnace and it will work just like mine.
PS, Didn't mean to hi-jack this thread, just helping out.
 
Just for my FYI. How do you hook up the main furnance blower to run without kicking on the propane? Looking to add an add on wood furnance this fall. Thanks

Brian

You need a small relay. Then you can run r and g on the circuit board of the central furnace. I don't have any blowers on my woodfurnace, its only the central furnaces blower. The woodfurnace is ran in series. I have a limit/control. When it hits 140, the relay energizes r and g on the central furnace and the blower only runs. I have the blower speed set on low, to extract the heat from the wood furnace. Works well. I'm pushing over 1400 cfms through my 1500 hotblast.
 

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