I had an old thermostat that i had to change need wiring diagram
both thermostatats will have terminal designators R,W,Y,G, possibly O/B, C, W1,W2, Y1, Y2, etc.
Simplest method is to remove wires from old stat one at a time. mark where they came from and then install at same desinated terminal on the new t-stat. Hope this helps. be sure to shut off power supply to the unit (furnace) first. The wire coming to the R (RH,RC) terminal is the 24 volt a/c hot, all others are feeding back to perform given function.
On the front of the honeywell control box it is labeled as follows:
Button one Button 2
Heat Off Cool Auto On
Fan
I want to clear up the last comment
botton 1 you can select
Heat Off Cool
botton 2 is labeled Fan
Auto On
on the front of the honeywell box what does it say 1 heat, 1 cool or 2 heat , 1 cool
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