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5
Connect a 24 VAC common wire to power the thermostat.
a.
Locate all unused wires from the thermostat wire bundle
and write down the colors.
• 24V Common wire is typically (not always) colored blue
Unused wires
b.
Go to the indoor air handler or furnace and remove the
cover(s) to access the 24 VAC air handler or furnace wire
terminals.
24 VAC
Air handler
or Furnace
wire
terminals
c.
Find the 24 VAC common terminal identified with the
letter C, X, B, or COM.
• This 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.
Thermostat
wire bundle
e.
Air handler
or Furnace
cover
f.
Locate the thermostat wire bundle inside the air handler
or furnace panel.
• This wire bundle is routed from the thermostat, through
the walls, and into the air handler or furnace panel.
• This 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.
Unused
wires
Find a wire from the thermostat bundle that is unused at
the thermostat and at the air handler or furnace.
• It 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.
Unused
Connect the unused wire to the 24 VAC terminal, then
replace the air handler or furnace cover.
• The 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.
Connect
wire
Thermostat
wire bundle
wire
3
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