Installation Manual

12 13
Label
Old
Thermostat
Typical
Wire Color
Description
G Green Fan relay
L System monitor
C Black/Blue Common of 24VAC
transformer
AUX Auxiliary Heat
W3 3rd Stage Heat
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
around a pen). Remove the mounting plate
from the wall.
12. Line up the iDevices
®
Thermostat mounting
plate on the wall in the desired location.
Check that it is level and the wires are in
a position to t through the hole on the
mounting plate. Use a pencil to mark anchor
locations on the wall.
13. Set the mounting plate aside. Drill two holes
(3/16” diameter) at the locations you
have marked.
14. Install the provided anchors into the wall, line
up the mounting plate to the holes and install
with the provided screws.
15. Head to the Wiring Conguration section,
starting on page 18, to nd the conguration
that is closest to your old thermostat
and note which system you have for later
reference.
16. Connect the wires to the mounting plate
!