Twinning Furnace Wiring Diagram. Furnace wiring suburban gas diagram creative box. The purpose of twinning terminal is to start the indoor fan motor (s) at the same time. York Furnace Wiring York Furnace Wiring Diagram Free Wiring Diagram from wiringschemas2.blogspot.com Was told 2 single furnaces would have to be installed and then a twiing kit […]