Installation Guide

8
W2
G W
YR RCK
Y2
C
MCR33878
Y
HEAT PUMP
CONVENTIONAL
AUX/E
G O/B
YRRCK
L
C
C
G
W
R
1.7 Connect wires
1.7a StartingwiththeCWire,matchthe
sticky tag on the wire to the terminal
labels.
Important! C wire is required and is the
primary power source. Without a C wire,
your thermostat will not power up.
View the Alternate Wiring videos at
wifithermostat.com/videos
 1.7b Loosenscrew,insertwireoninside
edge of terminal, then tighten screw.
 1.7c Verifywireisfirmlysecuredbygently
pulling on wire.
 1.7d Repeatsteps1.7a–1.7cforallotherwires.
 1.7e Pushanyexcesswirebackintothewall
opening after all wires are installed.
Note: The wiring for your
application might be different
from the wiring shown above.
Labels don’t match or have heat pump system?
See User Guide.
Remove metal jumper only if you
have both R and RC wires