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2. For Heat Control Module Ignition Circuit
a. 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 “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” (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.
b. For Models With Hot Surface Ignition (HSI) Module
1) Start the drying cycle.
2) The HSI will turn on, and after approximately 4-
seconds the ignitor will shut off and the gas valve will
be energized. Ignition (flame) should now be
established.
3) With the burner flame on, remove the flame sensor
wire from the S2 terminal of the HSI module. The
burner flame must shut off immediately.
4) Stop the drying cycle, with the flame sensor wire still
removed, restart the drying cycle.
5) The HSI will turn on, and after a few seconds later
the gas valve will be energized and the HSI will shut
off. Ignition (flame) should be evident for
approximately 7-seconds and then shut off.
6) The HSI module will attempt to light burner only
“once.” If flame is not reestablished the HSI module
will lockout and the “red” indicator light will flash
continuously.
7) Functional check of the HSI module is complete.
a) Replace the flame sensor wire from the S2 terminal to the HSI module.