Hello everyone,

I have a problem with figuring out the wiring from a Trane XL80 2-stage furnace/ac unit to a Hunter Programmable Thermostat model 44155C. The existing thermostat is an old mercury based thermostat. It has the following terminals:

G1 - green wire
Y1 - yellow wire
W1 - white wire
W2 - blue wire
R - red wire

The new Hunter has the following terminals: G, RC, RH, Y/O, W/B, Y1. Since I don't have the manual for the furnace, I have problems with figuring out where each wire goes on the new thermostat. I've been able to figure out that the red wire goes into the RH terminal. I've tried many other combinations but the results have been the same: nothing.

Any help will be appreciated. Thank you.