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Wire Labeling and Connectors
The labeling of the inputs/outputs of the
thermostat can be found on the rear of the
thermostat.
Refer to the table below for labels and definitions.
Thermostats equipped with plugs (9420-382):
Reference illustration below for connectors.
If the wires are cut to remove the plugs, the wires must be spliced (or terminated) following the electrical
code and using good workmanship practices.
Label on
Definition
Thermostat
R
Voltage input (+12V)
B
Ground
Y
Compressor output
GH
Fan high output
GL
Fan low output
W
Gas heat output
WHP
Elec heat output
SENS
External sensor input
1
WHP Connection for Electric heat output is used
for Heat Pump or the strip heat accessory for the
A/C.
The connectors of the thermostat can accept 20
AWG solid wire. To insert a wire, strip the wire to
the appropriate length (5/16"). The stripped length
can be checked by using the strip gage on the back
of the thermostat. Press the stripped wire into the
connector until the initial resistance is overcome.
Lightly tug on the wire to ensure the connection is
solid.
To remove a wire, press down on the connector's
tab with a screwdriver and pull wire vertically. It
won't take much force to pull the wire to remove it.
If the thermostat had wires previously inserted into
one of the connectors, it is recommended to use
the same gauge wire in that position or a larger
(diameter) gauge wire.
1
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