Installation Guide

Remove Existing Thermostat

• Turn oﬀ the power to the thermostat. This is usually done at the hea ng/cooling system or

circuit breaker panel.

• Remove the cover of old thermostat to expose the wiring terminals.

• Take a picture of the wiring terminals and the wires before disconnecting them!

• Mark the exis ng thermostat wires with the wiring labels included according to the terminal

markings. Some installa ons may have addi onal wires not shown in this example illustra on.

Y1, Y2, W1, W2, O,B.

• Use the thermostat terminal “names/marking” (not the wiring color) to mark the wires.

• Remove the old thermostat base.

CAUTION: When removing thermostat, don’t let the wires slip into the wall and don’t let the wires

touch each other.

• If the old thermostat was a mercury style thermostat, dispose of it properly as described below.

Figure 2. Label Wire Terminals

NOTE: Taking a picture is critical if problems are encountered. This will allow reinstallation

of the old thermostat and will help with troubleshooting later if needed.

Terminal Typical Wire Color Function

Y YELLOW Cool

W WHITE Heat

G GREEN Fan

R RED 24VAC Return

C BLUE 24V Common (typically BLUE). When the wire is

present, the thermostat can be powered without

ba eries. When the wire is absent, the thermostat

must be powered by ba eries if 24VAC is present

across the R&C wires

Wiring Colors

While the thermostat terminal markings are intended to match the wire color, (R=RED, G=GREEN,

W=WHITE, Y=YELLOW) be sure to follow the terminal marking when marking the wires, even if the

wire color doesn’t match.

WARNING: If the exisƟ ng thermostat is a mercury-containing device, it must be disposed

of in compliance with federal, state, and local regulaƟ ons. Many states and /or local

agencies have collecƟ on/exchange programs or hazardous waste collecƟ on programs for

mercurycontainingdevices. For more informaƟ on, see the U.S. Environmental ProtecƟ on

Agencywebsite at:hƩ p://www.epa.gov/osw/hazard/wastetypes/universal/mce.htm For Canada:

Environment Canada and Disposing of Mercury Products at: hƩ ps://www.ec.gc.ca/mercure-

mercury/default.asp?lang=En&n=F111AAC6-1.

LABEL THE WIRES TO MATCH

THE OLD THERMOSTAT TERMINAL

MARKINGS

EXISTING THERMOSTAT TERMINALS

TAKE A PICTURE!