American Dryer Corp. ADG / MLG-170DR Installation Manual page 39

2. For Models with Direct Spark Ignition (DSI) Module (Type I)
Theory of Operation:
Start the drying cycle. When the gas burner ignites within the chosen trial
for ignition time (6-seconds), the flame sensor detects gas burner flame
and signals the DSI module to keep the gas valve open as long as there is
a call for heat. The DSI module will "LOCKOUT" if the gas burner
flame is not sensed at the end of the trial for ignition period. The trial for
ignition period will be repeated for a total of three (3) retries/trials (the
initial try and two [2] more retries/trials). If the flame is not sensed at the
end of the third retry/trial (inter-purge period of 30-seconds) the DSI module
will "LOCKOUT" (light emitting diode [L.E.D.] diagnostic indicator
flashes).
A steady L.E.D. indicator indicates normal operation.
No L.E.D. indicator indicates a power or an internal failure has occurred.
3. For Models with DSI Module (Type II)
Theory of Operation:
Start the drying cycle. When the gas burner ignites within the chosen trial
for ignition time (8-seconds), the flame sensor detects gas burner flame
and signals the DSI module to keep the gas valve open as long as there is
a call for heat. The DSI module will "LOCK OUT" if the gas burner
flame is not sensed at the end of the trial for ignition period. The trial for
ignition period will be repeated for a total of three (3) retries/trials (the
initial try and two [2] more retries/trials). If the flame is not sensed at the
end of the third retry/trial (inter-purge period of 30-seconds), the DSI
module will "LOCK OUT" (a red L.E.D. diagnostic indicator will flash).
An unlit red L.E.D. diagnostic indicator indicates normal operation.
A lit green L.E.D. diagnostic indicator indicates dryer controller is calling for heat and that ALL interlocks have
been satisfied.
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