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2. For Models With Johnson Controls Direct Spark Ignition (DSI) Module (G760)
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 “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” (light emitting diode [L.E.D.]
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 Fenwal Controls Direct Spark Ignition (DSI) Module (128937)
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” (diagnostic indicator light emitting
diode [L.E.D.] will flash).
Unlit L.E.D. diagnostic indicator indicates normal operation.
A call for heat L.E.D. on indicates dryer controller is calling for
heat and that all interlocks have been satisfied.