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Step 3 Label and Disconnect Wires
sticker area
1) One by one, apply the
corresponding sticker (below) to
each wire and disconnect each
from your current thermostat.
2) Be sure to note placement of
jumper cables as you may need
them in the new system.
TIP: Before disconnecting any wires,
take a photo of your current wire
configuration with your mobile device.
NOTE: If the terminal designations on your old thermostat do not match those
on the new thermostat refer to sample wiring diagrams in full user’s manual
at www.firstalert.com/thermostats.
Wire from the Install on the
old thermostat Function new thermostat Wire Color
terminal marked connector marked
G or F Fan G
Y1 or Y Cooling/Compressor Y1
W1 or W Heating W1/0/B
Rh, R, M, Vr, A Power R
C Common C
O/B Rev. Valve W1/O/B*
W2 2nd Stage Heat W2
Y2 2nd Stage Cooling Y2
W3 3rd Stage Heat W3
OUT - Outdoor Sensor SENSOR
OUT + Outdoor Sensor SENSOR
* O/B is used if your system is a Heat Pump.
6
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