Wiring

If labels do not match terminals, connect wires as shown below.

Conventional Systems

Alternate wiring (for conventional systems)

WIRING NOTES:

  1. If you must connect both R and Rc wires, set the R Slider Tab to the down position (2 wires).

  2. If your old thermostat had both R and Rh wires, set the R Slider Tab to the down position (2 wires). Then connect the R wire to the Rc terminal, and the Rh wire to the R terminal.

  3. If your old thermostat had only 1 C or C1 wire, connect it to the C terminal. If your old thermostat had 2 C or C1 wires, wrap each separately with electrical tape and do not connect them.

  4. C does not power the thermostat display or operations; batteries are always required.

Heat Pumps

Alternate wiring (for heat pumps systems only)

WIRING NOTES:

  1. Keep R Slider Tab in the up position (1 wire).

  2. If your old thermostat had both V and VR wires, stop now and contact a qualified contractor for help.

  3. If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, stop now and contact a qualified contractor for help.

  4. If the O/B connection is used the thermostat will not support W, Aux/W2 or E wires.

  5. C does not power the thermostat display or operations; batteries are always required.

  6. This model does not support the heat pump fault alert (L/A terminal). If this is desired, please contact a contractor for replacement model.