33-00133ES—01 6
Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wire
brings 24 VAC power to the thermostat. Many older mechanical or battery operated
thermostats do not require a C wire. If you don’t have a C wire, try:
• Looking for an unused wire that is pushed into the wall. Connect that wire to C and
check that it is connected to the 24 VAC common at your heating/cooling system.
Check the video section at wifithermostat.com
Note: Not all heating/cooling systems label the 24 VAC common C. Check your system
manual or contact the manufacturer to find out which terminal is the 24 VAC common.
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 6. See “Glossary” on page 27 for further definition.
For a heat pump system, see page 7. See “Glossary” on page 27 for further
definition.
Installing your thermostat
Wiring (conventional system)
7A 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. See page 6.
b Loosen screw, insert wire on inside edge of
terminal, then tighten screw.
c Verify wire is firmly secured by gently pulling
on wire.
d Repeat steps a–c for all other wires.
e Push any excess wire back into the wall
opening after all wires are installed.
f Continue to page 9.
Labels don’t match? See alternate
wiring key on page 7.
Note: The wiring for your
application might be different
than the wiring from above.
Y2
W2
K
RC
R
W
Y
G
C
RC
R
O/B
Y
G
C
R
W
G
C
Y
HEAT PUMP
CONVENTIONAL
L
E/AUX
K
Remove metal jumper
only if you have both
R and RC wires
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