Quick Start Guide

7
MCR34540
C
K
Rc
R
W-
O/B
Y
G
W2-
Aux/E
Y2
L
W
Y
G
R
C
1.6 Connect wires
Important! C wire is required and
is the power source. Without a C wire,
your thermostat will not power up.
View the Alternate Wiring videos
at wifithermostat.com/support
1.6a Starting with the C Wire, match
the sticky tag on the wire to the
terminal labels.
1.6b Straighten wire and gently slide
into terminal hole until it snaps
into place. (If you need to
remove a wire, use a pen tip to
press the terminal release and
then pull the wire out.)
Note: Refer to the wiring picture
you took in Step 1.2.
Tip: To make it easier to slide the
wire into place, use a pen tip to
hold down the terminal release.
Note: The wiring for your application
might be different than the wiring
shown below.
Labels don’t match or have
heat pump system?
See User Guide.
Terminal release
Remove jumper loop
ONLY if you have both R
and Rc wires.
EXAMPLE WIRING
Yours may look different