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a) Burner Fan Air Switch
The differential in air pressure is measured by the burner fan air switch, which is located next to the
burner fan motor. If the combustion air is inadequate, this switch will prevent ignition. The setting
of this switch is adjustable, and it should be set at 12 to 15 millimeters (.4 - .6 inches water column
[W.C.]) - .995 - 1.49 millibars.
b) Burner Fan and Motor
The combustion air is produced by a 6-1/4-inch (15.88 cm) squirrel cage fan which is attached to a
1-1/2 HP (1.12 Kw), 3,600 RPM motor. The motor must spin counterclockwise (CCW) as
viewed from the rear of the motor.
c) Combustion Air Lint Filter
The combustion air lint filter is made of a fine mesh stainless steel screen which must be cleaned
regularly. This screen prevents any lint from entering the burner box.