ADC AD-464 service manual

1)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 approximately .59-inches (15 mm) of water column (W.C.) because of slight variances in spring tension characteristics, range settings, and markings are nominal.

2)Burner Fan and Motor

The combustion air is produced by a 6-1/4" squirrel cage fan attached to a 1-1/2 HP, 3,600 RPM motor. The motor must spin counterclockwise (CCW) as viewed from the rear of the motor.

3)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.

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