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38 American Dryer Corp. 113068-7
C. GAS BURNER AND IGNITION SYSTEM
The dryer gas burner system operates on an on/off gas rate sequence to accurately control the basket’s (tumbler’s)
drying temperature. Maximum firing rate is 2,800,000 Btu/hr (705,588 kcal/hr).
Upon a call from heat, the dryer computer sends a 120 volt signal to the burner controller module (BCM), which
initiates and controls the ignition sequences. The BCM ensures that ALL the safety switches are closed before
turning on the combustion air burner fan, then checks to ensure that the burner fan air switch has closed. The
pilot gas flame is then established, the flame rod (which sits in this pilot flame) comes in contact with the flame
and signals the BCM. The main motorized gas valves open in sequence and full operational flame is achieved.
The BCM has five (5) light emitting diodes (L.E.D.s) on its cover and two (2) neons on the mounting base for
ease of troubleshooting, as well as dip switches inside for ease of programming.
The BCM controls
ALL of the gas burner ignition components, except for the motorized gas valve. When the
drying set point temperature is reached, the dryer’s computer closes the top motorized gas valve, shutting off full
flame.