How to wire Honeywell Thermostat to Heil Package heat and air? Need to know how to wire a Honeywell thermostat to a Heil Package heat and air system? It will not work properly with an electric furnace/ac system. You will need a thermostat designed for that system. The terminals would be something like this. W = heat strips. R = 24v. and have differnet wiring Wiring Diagram For Heil Furnace Need a wiring diagram for relays on a heil furnace model #NUGKAH02 - Answered by a verified HVAC Technician. WIRING DIAGRAM (*8DNL). 24 These furnaces represent the very latest in high efficiency gas furnace technology. Manuals - ICP, TempStar and Heil Parts 164 rowsWiring Diagram for Split System Heat Pumps » 14 SEER Single Package Air NAMEDOWNLOADSLAST MODIFIEDWiring Diagram for Split System Heat Pumps - Wiring Diagram fo181 downloads03-08-2018 17:10Variable Speed Split System Heat Pump Application Guidelines - 124 downloads03-08-2018 17:10Variable Speed Split System AC Application Guidelines - Variable 92 downloads03-08-2018 17:10TXA Split System 2 thru 5 Ton 14 Seer Enviromax Air Condition T85 downloads03-08-2018 17:10See all 164 rows on icptempstarparts Low Voltage Wiring On Furnace - Wiring Diagram What types of wiring are used for a gas furnace. This additional terminal is labeled g in the thermostat. Most room thermostats on heating and cooling systems receive their 24v dc electrical power from a low voltage transformer that itself is usually found at the boiler or furnace blue arrow in our photo at left.