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3.
Troubleshooting and System Detailed Diagnosis For ADC Direct Spark Ignition Module P/N 128973
When the dryer calls for heat, 24 VAC from the step down transformer is applied to the TH and GND
terminals of the DSI module. The DSI module L.E.D. (light emitting diode) indicator will LIGHT RED
(for up to approximately 1.5-seconds [prepurge]) then the L.E.D. indicator will LIGHT GREEN; the gas
valve will be energized, and the spark burst will be evident (on) for approximately 8-seconds at the tip of the
electrode flame-probe assembly. Flame should now be established and confirmed. If a flame
is not
sensed and confirmed by the ignitor/flame-probe sensor after the approximate 8-second spark burst, the
DSI module will go into the LOCKOUT mode and the L.E.D. will LIGHT RED CONTINUOUSLY.
THERE ARE NO RETRIES. Burner Ignition Control Fault will display. To clear this fault press the
CLEAR/STOP key.
If a flame has been established and confirmed and then lost, the DSI module L.E.D. indicator will continue
to LIGHT GREEN and immediately a spark
will be evident (on) for approximately 8-seconds. The flame
should now be established and confirmed. If a flame
is not sensed and confirmed by the ignitor/flame-
probe sensor after the approximate 8-second spark burst, the DSI module will go into the LOCKOUT
mode and the L.E.D. will LIGHT RED CONTINUOUSLY.
THERE ARE NO RETRIES.
a. System Diagnosis
1) Gas Pressure
A gas pressure test should be taken at the
gas valve pressure tap provided on every gas
valve to assure that the water column (W.C.)
pressure is correct and consistent.
There are two (2) types of devices commonly
used to measure water column (W.C.)
pressure. They are the spring and mechanical
type gauge and the water column test gauge
(manometers). The use of the spring and
mechanical type gauges
is not recommended
because they are not always accurate. The
preferred type of gauge is the manometer
because it is a simple device to use and is
highly accurate. A manometer is simply a
glass or transparent plastic tube with a scale
graduated in inches. When it is filled with
water and pressure is applied, the water in
the inner tube lowers, showing the exact
water column (W.C.) pressure in inches.
WARNING: Test ALL connections for leaks by
brushing on a soapy water solution.
WARNING: NEVER TEST FOR LEAKS
WITH A FLAME!!!