Honeywell Home T9 Guide D'installation page 6

Write down the colors of the wires
8
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 HoneywellHome.com/support to find out more.
Disconnect the wires and remove
9
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.
Do you have a C-Wire?
10
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*
Compatibility Check
6
Terminal
¨
R
¨
R
C
¨
R
H
¨
W
¨
W2 or Aux
¨
Y
¨
Y2
Y G C
Y G C A
U
Wire Color