Use and Care Manual
6
10
Do you have a CWire?
Look at the thermostat wiring
checklist from Step 8, or the photo
you took. Is the CTerminal checked?
This means you will not need
to install the included CWire
Adapter. Skip to Installing Your
New Thermostat (page 9).
This means you don’t have
a C-wire connected to your
thermostat. Continue to next
step.
Compatibility Check
YES
NO
9
8
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.
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 Wire Color Terminal Wire Color
¨
A or L/A
¨
R
¨
C Required*
¨
R
c
¨
E
¨
R
h
¨
G
¨
W
¨
K
¨
W2 or Aux
¨
O/B
¨
Y
¨
U (1 or 2)
¨
Y2
*A C-wire or CWire Power Adapter (included) is required.
If there are wires in terminals that are not listed, you will need additional
wiring support. Visit honeywellhome.com/support to find out more.
C
C
U
GY
GY
A
33-00421ES_A.indd 6 11/7/2018 10:37:45 AM