ADC AD-115ES - Manual (Page 47)

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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
“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” (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.