Doug, THANK YOU SO MUCH! Yes, we have a Coal Trol. How do we know if it has 24 volt terminals?
Last year a lot of our heat wound up coming out of a return duct on the 2nd floor, with some weak air flow from the 1st floor ducts. The upstairs return duct is straight up from where hubby tied the stove into our ductwork in the basement, and the furnace fan on low was not enough to blow that hot air thru the system. The upstairs bedrooms were sweltering and unusable, even with the heating ducts closed from the basement, between the return duct heat and the natural rise of heat from downstairs. (It's 3 bedroom house and we don't use them, they're basically guest rooms, but still...)
Our main floor was still warm, we maintained 69-70 degrees which was what we keep the Coal Trol set at, and our basement, where the stove is located, was toasty too (about 72), even though unfinished with no insulation. (A condition that we wanted to have rectified this year, but I was out of work for 1-1/2 yrs, so no money to buy insulation). I'm sure we'd use less coal if we weren't heating the 2nd floor to 90 degrees or more (and of course if we insultated the basement)! So, we heated 2700 sq. ft., 1100 of which is uninsulated basement, and 500 of which was way overheated (90+) with no problem. We did have to fire up the 2nd burner on the Hyfire II a few times, though, to keep the 1st floor at 69.
This year he wants to connect the stove to its own run down in the basement over to another area close to the furnace where he will tie it in to our home's duct work, (probably his choice of area where the stove is currently tied into also contributed to most of the heat going straight up to that return duct) and he thought to use helper fans, but if we can get the furnace fan to cycle on and off and to utilize the higher speed that it uses if the propane heat is running
, that would be perfect.
We were also wondering about switching out our 2 Hyfire fans to the 512k fans that LL has been working on. Wonder if one 512k, (with one burner lit), would be enough to move the air thru our ductwork without the furnace fan or helper fans... current fans are 265 cfm each, I believe.