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[bigk712]

I have recently hooked up a mahoning owb putting a heat exchanger in my plenum of my existing oil furnace, I have ran all my wires out to the relay and went over the schematics a million times, I turn on my thermostat my water circulator turns on to circulate but my furnace blower won't kick on, both wires on the blower are black and I have tried hooking up to each of them and still nothing, am I supposed to wire into both of them? On the wiring diagram it only shows going to one of them. I'd appreciate any help thanks

[bigk712]

Also is there a way to wire the thermostat to automatically
 kick on the blower

[slimjim]

The blower on the hot air unit will have a hot wire and a common wire that both need to go back to the relay just like the circulator, the oil or gas burner can be controlled using an aquastat on the incoming wood boiler water line, this will shut off the oil or gas burner and only turn on the blower on a call for heat, when the wood boiler goes out the oil or gas will then return to normal operation automatically.