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19
PROCEDURE FOR FUNCTIONAL
CHECK OF REPLACEMENT
COMPONENTS _________________
Microprocessor Controller (Computer)
Board _________________________________
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.)
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.