06-05-2016, 02:13 PM
Honeywell claims that the RTH9580WF wifi touchscreen thermostat works with multistage units. Finding the correct wiring combination could be a bit of a challenge based on Chester's information. The Honeywell has connectors for C, K, Rc, R, W-O/B, Y, G, W2-Aux/E, Y2 and L. Incidentally C is required.