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13
e. The Tumbler Hi-Limit Switch is a thermostat type switch located
above the Lint Basket. Its function is to discontinue heat (flame)
in the event of an over temperature situation (above 225º F).
225º F Thermostat
MAN3484
f. The gas valve used in the ADG-200 is of the redundant type which
means that the gas valve is actually two gas valves in one; one in
series with the other. This is a safety feature which provides
protection against gas flow in the event that one of the valves does
not seat properly. The valve also regulates the incoming gas
pressure.
NOTE: THE DSI GAS VALVES ARE NOT FIELD
REPAIRABLE.
Redundant Gas Valve
g. Normal Operation of the Direct Spark Ignition (DSI) System (refer to the illustration on page 14)
1) The DSI System consists of a microprocessor-based control module, along with an Ignitor/Flame-
Probe Assembly. This control utilizes a high voltage synchronous spark ignitor and a rectified flame
sensor probe signal to locally control ALL basic functions in the gas burner.
On a call for heat by the dryers' controls, 24 VAC is applied to the DSI module at which time the modules'
L.E.D. (light emitting diode) indicator will light "RED" indicating that power has been established to the
module. Almost immediately (up to approximately 1.5 seconds [pre-purge]) the indicator will light
"GREEN," the gas valve opens and the spark burst will be evident (on) for approximately 8-seconds.
The burner flame should now be established/confirmed.
If at this time the flame has not been established and confirmed, the DSI module will "LOCK-OUT" and
the modules' L.E.D. indicator will light "RED" and stay on continuously. To reset or cancel the "LOCK-
OUT" condition, open and close the main door then restart the dryer.
Once the burner flame is established and confirmed, the DSI module indicator will light "GREEN," and
the burner system will continue through a normal heating cycle, where the DSI system will cycle on and
off as required by the dryers controls.
During the normal heating cycle, should a "FLAME-OUT" occur (i.e., severe air turbulence forces the
flame away from the ignitor and flame-probe assembly), the DSI module shut the gas valve off and
immediately try to reestablish the burner flame. The DSI module will attempt to light the burner ONLY
ONCE. If flame is not established, the DSI module will "LOCK-OUT." To reset or cancel the "LOCK-
OUT" condition, open and close the main door then restart the dryer.