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For Models with Johnson Direct Spark Ignition (DSI) Controller
(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.] 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.
For Models with Fenwal Controls 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 (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.