Currently combating the task of hooking back up an old Jensen wood boiler that my grandfather had half disconnected around 30 years ago. I'm versed in electrical, but pretty new to HVAC and have no idea how to rehook up what I'm guessing is the aquastat for the draft fan. aquastat for the circulator pump is still connected to 110 but seems to run strictly to the pump straight off the mains. The line of fmc runs from the aquastat to the circ pump.