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e. The Manual Reset Tumbler (Basket) 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 [107º C]).
f. The gas valve used in the ADG-200 is of the redundant type
which means that the gas valve is actually two (2) gas valves in
one; one (1) in series with the other. This is a safety feature
which provides protection against gas flow in the event that one
(1) of the valves
does not seat properly. The valve also regulates
the incoming gas pressure.
NOTE: THE DSI GAS VALVES ARE NOT FIELD
REPAIRABLE.
g. Normal Operation of the Direct Spark Ignition (DSI) System (refer to the illustration on page 17).
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 [prepurge]) 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 LOCKOUT
and the modules L.E.D. indicator will light red and stay on continuously. Burner Ignition Control
Fault will display. To clear this fault press the CLEAR/STOP key.
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/Flame-Probe Assembly), the DSI module will 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 LOCKOUT and Burner
Ignition Control Fault will display. To clear this fault press the CLEAR/STOP key.
225º F (107º C) Thermostat
MAN3484
Redundant Gas Valve