User Manual

12
Label
Old
Thermostat
Typical
Wire Color
Description
Y2 Gray Stage 2 compressor
relay
Y1 Yellow Stage 1 compressor
relay
G Green Fan relay
L System monitor
C Black/Blue Common of 24VAC
transformer
9. Make sure you don’t have
any 120/240V wires (look
for thick black wires with wire
nuts.) If you do, the iDevices
®
Thermostat is not compatible
with your system. If you are
not sure, call us at
888.313.7019.
10. Record the locations of any jumpers
and note whether there is a wire
connected to RC and/or RH.
11. Disconnect the wires from the existing
mounting plate (ensure the wires don’t fall
back into the wall by gently wrapping them
!