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16
WIRING DIAGRAM
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HIGH
WIRING DIAGRAM
(CONT'D)
WIRING DIAGRAM TO
FURNACE
FOUR
WIRE
TWO WIRE
heating only
W
FOR A FURNACE
R
CONNECTION TO
G
A COOLING SYSTEM:
C
Y
On some newer furnaces and older
FURNACE
thermostats, energizing the R and
24-VOLT
TERMINAL BLOCK
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 Furnace Interlock Wiring"
FOUR
WIRE
TWO WIRE
heating only
W
R
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
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.
Standard Accessory Control Contact
Standard Furnace Interlock Wiring
THERMOSTAT
TERMINALS
W
R
G
Y
COOLING SYSTEM
TWO
WIRE
Alternative Accessory Control Contact
Alternate Furnace Interlock Wiring
THERMOSTAT
TERMINALS
W
R
G
Y
WIRE JOINT
COOLING SYSTEM
TWO
WIRE
17
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