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Wiring
Diagram
Adjusting
the
Thermo-Disc
Your FC450 comes with an adjustable Thermo-Disc that turns the blower on and off automatically. The settings are
preset at the factory to turn the blower on at 125 degrees F and off at 105 degrees F. If needed, the Thermo-Disc temperature can be
changed to allow the blower to turn on or off at a lower or higher temperature.
Note: The adjustment settings on the Thermo-Disc will always be 20 degrees apart for on and off operation. For example, if the setting on
the Thermo-Disc is at the highest temperature 130 degrees F the blower will turn on at 130 and turn off at 110 degrees F.
See illustration below to adjust settings.
Note: Never attempt to make adjustments while a fire is burning in the furnace.
1. Make sure power cord is disconnected from electric outlet. Caution to prevent electrical shock never attempt to adjust Thermo-Disc
with electric connected.
2. Remove cover from 2” X 4” electric junction box on side of furnace.
3. Adjust the dial on the Thermo-Disc clockwise for the blower to turn on and off at a higher temperature.
4. Adjust the dial counter clock wise for a lower temperature.
5. After the adjustment has been made replace cover on electric junction box and plug power cord back into electric outlet.
17
THERMAL
FAN
CONTROL
SWITCH
BLOWER
MOTOR
WHITE
(L2)
BLACK
(L1)
GREEN
(GRD)
WIRING DIAGRAM
FC 450-SH2400
L4
L3
L1
L2
BLACK
JUNCTION BOX
THERMO SWITCH
BOX
100
11
0
120
130
TURN POINTER CLOCKWISE
TO INCREASE FAN CUTOFF
TEMPERATURE
(FACTORY SETTING-125 DEG F)