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5
Connect a 24 VAC common wire to power the thermostat. (Continued)
c. Find the 24 VAC common terminal identified with
the letter C, X, B, or COM.
�
iThis terminal may already have a wire connected to it
but it may not be a wire that is connected to the
thermostat
24 VAC common
terminal
(C, X, B, or COM)
d. Locate the thermostat wire bundle inside the
air handler or furnace panel.
iThis wire bundle is routed from the thermostat,
through the walls, and into the air handler or
furnace panel.
iThis bundle can be identified at the air handler or
furnace by checking the wire colors connected and
not connected and comparing to the wire bundle at
the thermostat.
Thermostat
wire bundle
Unused
wires
e. Find a wire from the thermostat bundle that is
unused at the thermostat and at the air handler
or furnace.
�
iIt is possible that one of the unused wires at the
thermostat will already be connected to the 24 VAC
common terminal at the air handler or furnace. If so,
go to step 6.
f. Connect the unused wire to the 24 VAC terminal,
then replace the air handler or furnace cover.
�
iThe 24 VAC common wire is typically (but not always)
blue in color. If the blue wire is not used, it is
recommended that you use the blue wire.
Unused
wire
Connect
wire
3
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