Owner's Manual

Installing
your thermostat
Important!
This thermostat requires a
C,
or common, wire for power. The
C,
or common,
wire brings 24
VAG
power to the thermostat.
If
you are replacing
an existing thermostat,
it might not have a
C wire connected to
it.
Many
older mechanical
or battery operated
thermostats do not require a C wire. See the C
Wire
Addendum
document
included
in
this package for more information.
If you don't have a
C wire, try:
Note: Not
all
heating/cooling systems label
the 24
VAG
common
C.
Check your system
manual
or contact the manufacturer to find out which
terminal
is
the 24
VAG
common.
J
~
J
View the Alternate
Wiring videos at wifithermostat.com/videos
Wiring
For
conventional
heating/cooling systems (natural
gas,
oil
or
electric
furnace, air
conditioner), see page
5.
See
"Glossary"
on
page 33 for further definition.
For a heat
pump
system, see page
6.
See
"Glossary"
on
page 33 for further
definition.
Wiring
(Conventional
System)
6A Wire the Wi-Fi thermostat to your
conventional system.
a Starting with the C Wire, match the
sticky tag
on
the wire to the
terminal
labels.
You
must
have a C wire.
b Straighten wire and
gently slide
into
terminal hole until
it
clicks
into
place.
(If you need to remove a wire, use a
pen tip to press the
terminal release
and then pull
wire out.)
Note: Refer to the wiring picture you took
in
Step
2.
Tip:
To
make
it
easier to
slide
the wire
into
place,
use a pen tip to
hold
down the
terminal release.
'
5
Note· The wiring for your
application might be different than
the wiring shown
below.
Terminal release
Yours may
look
different
I
Remove jumper loop ONLY
if
you have both
Rand
Rc wires.
Labels
don't
match?
See
alternate wiring keys
on
pages 7-8.