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Wiring diagram
WIRING DIAGRAM TO
FORCED AIR SYSTEM
FOR A FURNACE
CONNECTION TO
A COOLING SYSTEM:
On some newer furnaces and older
thermostats, energizing the R and
G terminal at the furnace has the
effect of energizing the Y at the
thermostat and thereby turning on
the cooling system. If you identify this
type of thermostat, you must use the
"Alternate Accessory Control Contact"
As per building codes and installation requirements for combustion appliances:
Air return ducts, or openings for air return, should not be placed in enclosed spaces containing combustion
appliances that are subject to spillage.
18
(CONT'D)
FOUR
WIRE
TWO WIRE
heating only
W
R
G
C
Y
FURNACE/HEATING
24-VOLT
TERMINAL BLOCK
FOUR
WIRE
TWO WIRE
heating only
W
R
G
C
Y
FURNACE/HEATING
24-VOLT
TERMINAL BLOCK
Standard Accessory Control Contact
Standard Furnace Interlock Wiring
THERMOSTAT
TERMINALS
R
G
W
Y
TWO
WIRE
Alternative Accessory Control Contact
Alternate Furnace Interlock Wiring
THERMOSTAT
TERMINALS
W
R
G
Y
WIRE JOINT
TWO
WIRE
COOLING SYSTEM
COOLING SYSTEM
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