Use and Care Manual

Remove cover from furnace or heating

system

Open the heating and cooling system’s

cover to ﬁnd the control board. You

should see the same terminal labels that

are on your thermostat.

Note: You may need to unscrew the cover.

The control board may be at the top or

bottom.

Connect the unused wire to the

C-terminal

Note: If there are existing wires in the

C-terminal, make sure they are still

connected to the C-terminal after

connecting this wire.

Find the other end of the unused wire

Locate the bundle of wires that are the

same as the ones at your thermostat.

The unused wire should be the same

color as the one near your existing

thermostat. See Step 13 for the color you

wrote down.

Close the cover to the furnace or

heating system

Be sure the cover is completely closed.

Some systems will not power up if the

cover isn’t fully closed.

You’ve connected the C-wire.

You will NOT need to use the included

CWire Adapter.

Go back to the wall where you are installing your thermostat and continue

to “Installing Your New Thermostat” on the next page.

33-00421ES_A.indd 8 11/7/2018 10:37:46 AM