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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) Test and 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 the flame rod. 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 (burner controller module) 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 (cubic feet per minute) - 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 W.C. (water column) 3.1 millibar. The combustion air system is
comprised of the components described on page 41 and page 42.