I have a amana 70,000 BTU dc motor furnace.I need to know how to wire a erie 3-way zone valve.I am going to put a outside wood boiler in with a heat exchanger on the furnace, it is a counter flow.when the furnace call for heat the zone valve open and the motor ramps up to high speed. Then when it goes back to by pass the motor goes down to low speed to keep the air moving in the house.someone told me to put a pump there not the zone valve I nt sure about that. Need help please thank you./////