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For Models with 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 3 retries/trials (the initial try and 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. 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 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 3 retries/trials (the initial try and 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.
Phase 7 Non-Coin Models
Upon completing installation of the replacement
microprocessor controller (computer) board, reestablish power
to the dryer.
Start the drying cycle by pressing any of the preset cycles in
letters A-F.
Verify that the applicable indicator lights on the microprocessor
controller (computer) board are lit. (Refer to the illustration
below.)