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40 American Dryer Corp. 113068-7
2) Light emitting diode (L.E.D.) and Neon Displays of the Burner Controller Module (BCM)
a) Operating Interlock – L.E.D. is lit when:
ALL safety interlock switches are closed applying a 120 VAC signal to terminal #7 of the
BCM.
b) Operating Interlock – L.E.D.
is not lit when:
One or more safety interlock switches are open. If any safety interlocks switch is open the
burner ignition sequence will not be attempted.
c) Air Failure – L.E.D. is lit if:
• Air switch
is not closed within 10-seconds of start-up of blower
• Air switch is open during firing cycle.
d) System Unsafe – L.E.D. is lit if:
• A dryer safety device, connected in series with terminal #7, is opened.
These safety devices include the door switches, tilt switches, basket (tumbler)
stop motion detector, high temperature limit switches, airflow switches,
high or low gas pressure switch, and main gas valve proof of closure switch.
• A loose connection on the flame rod or spark plug.
•
ALL purge time dip switches are in the off position.
• Flame is detected out of sequence.
• Inductance (H) is detected on sensor wires.
• Wiring fault on terminal #3, terminal #4, and terminal #5.
• Internal controller failure.
• Air switch closed before start-up.
e) Flame Signal – L.E.D. is lit when:
The flame rod is in contact with the pilot flame and the BCM converts a microampere (m)
current between the flame rod and ground into a 3 volt DC to 11 volt DC signal that can be
measured on the BCM. Insert one (1) probe of a DC volt meter into the flame signal port and
put the other probe to ground. The meter will read out the 3 volt DC to 11 volt DC flame signal.
If the flame signal L.E.D. flickers on and off, this is a result of a weak flame signal, which can
be caused by an intermittent wiring connection between the flame rod and the BCM, a faulty
ground connection, bad ground of the dryer, weak pilot flame, and dirty or defective flame rod.
f) Burner Controller Power On Indicator – Neon is lit when:
Burner controller has its supply voltage of 120 VAC.
g) Burner for Air Switch Status Indicator – Neon is lit when:
Air switch is closed after start-up of the blower (fan) and the interlocks are ALL closed.