NOTE: Proper grounding of the ignition
system (yellow wires) is very critical
for proper ignition sequence.
Ignition System-Function & Sequence
During normal dryer operation, the following occurs:
1. The dryer electronic control calls for heat.
2. If the drive motor is running, the motor safety
circuit provides power to the electronic control. If
the control senses that the heat should be on, a
circuit is closed allowing power through the high
limit thermostat and air ow switch to the ignition
transformer. The transformer provides 24VAC to
the ignition module and sparking occurs at the
ignition electrode. At the same time 24VAC is
applied to the gas valve.
3. Once the ame is established, the sensing electrode detects the presence of ame and the
sparking stops.
4. If for any reason the ame is not established in a period of 10 seconds, the electronic control
will try this sequence for 3 tries. Normally the 10 seconds “Trial For Ignition” period is ample to
establish and prove ame.
5. If the ame is shutdown or blown out during operation, the ignitor will imm.ediately go into “Trial
For Ignition” again for 10 seconds.
6. However,at the end of 3 separate retries of 10 seconds “Trial for Ignition”, the ame is not
established, the ignition system goes into “Safety Lock-Out” and will not reactivate the “Trial for
Ignition” until there is a current interruption for a period of 15 seconds. This interruption can be
provided by opening the dryer loading door and allowing the machine to come to a complete stop
for 15 seconds.
Ignition System-Checkout
1. If ame is present during “Trial For Ignition” period but the system shuts down, there may be
an improper ground. The entire ignition system is grounded together including the electrode
assembly, the electrode mounting bracket, the burners and the burner bracket. Shutdown can
also occur if for some reason the system isn’t sensing the ame. Check the sensor for damage
and check the connections of the sensor lead.
2. If there is no spark or intermittent spark, check black hi-voltage lead wire for damage or cracks in
insulation. (This lead wire must not be taped or connected to any metal edges along its length to
prevent pinching and arcing. Also, do not bundle this wire with other wires.)
NOTE: Spark gap and electrode location are important. If the electrode is damaged
or mounting is changed the spark gap may not be correct for ignition to
occur. Check for cracks in the ceramic insulator. Replace electrode assembly
if necessary. Also check for carbon or foreign material on the electrodes
and clean if necessary.
63
Part # 8533-090-001 7/21
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