A fan powered humidifier usually has an on-board transformer, permit me look at the manual again, i will need to depart for a while although as i'm out of time for this morning, i can be lower back later these days. There may be two approaches to cord this up. The primary technique is to take advantage of the hum terminal on the furnace manage board. This terminal will deliver 120 volts while the furnace is walking in warmness mode, so that you'll have to use an extra transformer. The furnace works best! However: q1. How do i realize which humidistat wires to hook up with furnace manage board terminals? Q2, q3. Exactly which terminals on the furnace control board - which ones and the way?.