Lately, I have been using a large kerosene heater to heat the house when we are home and awake. Sometimes I go downstairs to the furnace, and push in a button on the ?relay box? for the air handler, that way the heat gets circulated throughout the house better. There is a "fan only" position on the new Honeywell round digital thermostat I bought last month. I'd like to use that instead of walking downstairs, opening the oil furnace panel, and pushing or pulling the button to turn the air handler on and off. There are three wires hooked up to the thermostat (I installed) and only two hooked up to the terminals on the control sitting on the furnace ?Burner motor?. One wire is not connected to anything. Question: Can I hook up that one wire to switch on the fan only through the thermostat? And if so, where would I connect it?