30
The module also provides for safe proof of ignition. If a flame is not sensed by the flame-probe
electrode (of the ignitor/flame-probe assembly) within a specified time frame, the module will
de-energize the gas valve and the ignitor/flame-probe assembly, and go into the LOCKOUT mode.
If a flame is established (sensed) but then lost (flame out due to possible air turbulence), the Direct
Spark Ignition (DSI) module will wait 30-seconds then restart the ignition sequence.
IMPORTANT:
The DSI module is a precision instrument, and
should be
handled carefully. Rough
handling or distorting components could cause the module to malfunction.
WARNING:
THE DSI MODULE
IS NOT
FIELD REPAIRABLE.
NOTE:
To reset the DSI module if it is in the LOCKOUT mode, open and close the main door then
restart the dryer. If the module repeatedly locks out, refer to the
Troubleshooting Section
of
this manual.
b. The 24 VAC transformer is designed to step down the
operating (primary) voltage of the dryer from 120 VAC,
208 VAC, or 240 VAC to the 24 VAC (secondary voltage),
which is necessary to operate the DSI system and in some
cases the controls of the dryer.
The transformer has multi-primary taps, which allow for
one (1) transformer to be used for any voltage application
including...120 volts, 208 volts, or 240 volts. Refer to the
Service Information Section
of this manual for specific
transformer and wiring termination information.
c. The ignitor/flame sensor assembly is located in the burner
flame area and is used to ignite the gas by the use of a
high volt (HV) (14,000) synchronous spark, and to provide
feedback information to the DSI module as to whether
the burner flame is evident (on).
The ignitor/flame-probe assembly consists of a ceramic
insulated ignitor electrode, a ground rod and a ceramic
insulated flame-probe electrode. The gap between the
ignitor (spark) electrode and the ground rod is set, and
must be
maintained at 1/8” +/- 1/32” (3.175 mm
+/- 0.79248 mm). When the DSI module provides the
high voltage synchronous spark (14,000 volts) through the
high voltage (HV) wire/lead, a spark is produced “over”
the gap. When this spark is produced, the gas valve is
opened. Upon ignition, the resistance in the flame-probe
electrode (of the ignitor/flame-probe assembly) changes
and the information is sent to the DSI module via the sensor
probe lead connection to the module. Once the resistance
is changed and sensed, the DSI module will sustain the
gas flow (provide 24 VAC power to the gas valve).
24 VAC Transformer
Summary of Contents for AD-540
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