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113068-7 www.amdry.com 41
h) Burner Fan Air Switch Status Indicator – Neon is not lit:
• Air switch is not closed after start-up of burner fan.
• Door interlocks are open.
• Combustion burner screen is clogged.
• A door on the dryer is open.
i) Pilot Test/Reset Button
When this button is pushed in, the burner controller module (BCM) will halt the ignition sequence,
once the pilot flame is established. This allows the pilot flame to be adjusted.
3) Flame Rod and Spark Plug
The pilot flame is lit by the spark plug, while flame sensing is done through two (2) flame rods. First,
the spark plug is energized when the pilot solenoid valve opens, igniting the pilot flame. The flame
rod sits in the pilot flame and sends a 3 volt DC to 11 volt DC signal to the BCM when it is in contact
with the pilot flame. The pilot flame should be about the size of a tennis ball and should heat the
flame rod so it is red hot.
4) Burner Fan System
The burner fan provides additional combustion air for proper gas combustion. The fan provides
approximately 900 cfm (274 cmm) of air through the burner box. The airflow is obtained when the
air pressure is measured at the air pressure tap on the gas burner box approximately 1.25 inches
(3.1 mb) of water column (W.C.). The combustion air system is comprised of the components
described on page 38 and page 39.