Thermostat Wiring - Contractor Talk - Professional Construction and Remodeling Forum

daviar · 06-29-2008, 03:19 PM

The current thermostat is a 24 Vac Heat Pump Thermostat TA2000. This was the configuration when I started and how I wired it to the new thermostat (Honeywell Digital RTH7000). Right now the a/c comes on but then the heat does too. I think it is the emergency heat that is triggering. I am sure a wire is crossed or that the E should not be used at all. Also, not sure that I am selecting the correct system in the digital controls. Do I have a conventional multi-stage with 2 heat and 2 cool, multi with 2 heat and 1 cool, or 1 heat and 1 cool. There is a thermostat downstairs that is the main one and another upstairs in the bedroom. I think it is 2 heat and 1 cool. The bedroom has a different wire configuration.

Main Thermostat
Furnace Old Therm New Therm
E --> E --> Y2/E (not sure?- black wire) Think it should go to W2
G --> G --> G (green wire)
Y --> Y --> Y (yellow wire)
R --> R --> R (red wire)
C --> X --> C (not sure?- blue wire) Think it may not need to be connected
O--> O --> W/O/B (orange wire)
Aux --> W2 --> W2 (white wire i think should go in W)

Upstairs Thermostat
R --> R (red wire) also a black wire from R to RH
Y --> Y (yellow wire)
W1 --> W1 (white wire)
W2 --> W2 (black wire)

Also, there is a wire not being used that is brown.

Any help would be greatly appreciated. Thanks!

**ProWallGuy** · 06-29-2008, 05:15 PM

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