• 1.  Prepare
  • 2.  Remove
  • 3.  Label wires
  • 4.  Mount plate
  • 5.  Connect wires
  • 6.  Set switches
  • 7.  Install batteries
  • 8.  Done





Label the wires, then disconnect 



Write down the wire colors and letters. Use the terminal stickers to label the wires. (Your system type determines which terminals you’ll use and which you won’t.) To keep wires from falling back into the wall hole, tape them to the wall or wrap them around a pencil. More helpful wiring hints:

  • Only one reversing valve is needed to run a heat pump. If both “O” and “B” are present, “B” may be a common wire.

  • Often, 2-wire heat-only systems don’t have terminal labels. Connect one wire to the RH terminal and the other to W.

  • If you have a 3-wire hot water system, the damper valve control wire will be labeled and attached to the “A” terminal.

  • For additional help with wiring or determining your system type, contact our Technical Support team at 1-888-830-1326.
TIP Never use the wire color to wire your thermostat, even if the wire colors seem to match the letter designations.
Determining what type of HVAC (Heating, Ventilating and Air Conditioning) system you have can be confusing. If you’ve read our FAQs and Glossary and you still need help, please contact our Technical Support team at 1-888-830-1326
Conventional Wiring Diagram

Heat Pump Wiring Diagram

Heat Pumps