GAS OR
ELECTRIC HEAT
FAN
COOLING
POWER
W
G
RY
4 Conductor 18 to 22 gauge
unshielded cable from the
thermostat to the equipment.
4 Wire, 1 Stage Cooling, 1 Stage
Gas or Electric Heat
Residential Gas or Electric Heat *,
Electric Cool, split systems & package
units
W
Y
B
O
G
R
C
Common wire optional
*
Common wire is optional in all installations. If a common wire is not used the
thermostat must be powered by the two AA Alkaline batteries (page 6). These
batteries must be replaced each year or when the Low Battery indicator is
displayed (page 2, 5).
*
Sample Wiring Diagrams
Page 8
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