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8
Write down the colors of the wires
Check the boxes and write down the color of the wires connected to terminals
that are coming from the wall. Check all that apply (not all will apply).
Terminal
¨
A or L/A
¨
C
¨
E
¨
G
¨
K
¨
O/B
¨
U (1 or 2)**
* A C-wire or C-Wire Power Adapter (included) is required.
** The T9 Smart thermostat cannot control equipment wired to U1 or U2.
If there are wires in terminals that are not listed, you will need additional
wiring support. Visit
9
Disconnect the wires and remove
the old wall plate
You may need a screwdriver to
release wires from terminals.
Tip: Wrap the wires around a pencil
to prevent them from falling in the
wall.
10
Do you have a C-Wire?
Look at the thermostat wiring
checklist from Step 8, or the photo
you took. Is the C-Terminal checked?
YES
This means you will not need
to install the included C-Wire
Adapter. Skip to Installing Your
New Thermostat (page 9).
NO
This means you don't have
a C-wire connected to your
thermostat. Continue to next
step.
Wire Color
Required*
honeywellhome.com/support
Compatibility Check
6
Terminal
¨
R
¨
R
c
¨
R
h
¨
W
¨
W2 or Aux
¨
Y
¨
Y2
to find out more.
C
Y
G
Y
G
C
A
U
Wire Color
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