Hi, I just bought a house and it has a defiance volcano wood/coal burning furnace, this unit is placed next to a high efficiency propane furnace and share the same return and supply ducts. Both units are very clean and I know the propane works fine, the previous owner was very meticulous but I cannot find a owners manual for the defiance. I would like to use it but read more about it. The internet has not yielded any answers. Is defiance outta business? Should I just start er up and see how she fires? Any help appreciated. Thnaks Ira