Honeywell Home T9 Smart Thermostat Guide D'installation page 8

14 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.
15
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.
16 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.
17
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.
8
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C
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G
C
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Y
G
C
R
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Y