Fantech 405335 Installation Manual page 15

WIRING DIAGRAM
WIRING DIAGRAM TO
FURNACE
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 thermo-
stat, you must use the "Alternate
Furnace Interlock Wiring"
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
(CONT'D)
Standard Accessory Control Contact
Standard Furnace Interlock Wiring
FOUR
WIRE
TWO WIRE
heating only
W
R
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
Alternative Accessory Control Contact
Alternate Furnace Interlock Wiring
FOUR
WIRE
TWO WIRE
heating only
W
R
WIRE JOINT
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
THERMOSTAT
TERMINALS
R G
W Y
TWO
WIRE
THERMOSTAT
TERMINALS
R G
W Y
TWO
WIRE
COOLING SYSTEM
COOLING SYSTEM
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