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Page 17
NOTE: Some models are equipped with a dual ignition system.
The dual ignition system contains two direct spark
ignition modules in parallel. Each module has its own
flame sense circuit and acts independently of the other.
If either bonnet limit thermostat opens because of high
heat or flame impingement, the entire ignition system
will shut down.
1. When a call for heat is received from the control supplying
24VAC to the ignition control module, the pre-purge delay
timer begins. This delay time allows any air/sediment to be
ejected prior to burner ignition. Following the pre-purge delay
period, the gas valve is energized and the spark ignitor sparks
for the trial for ignition period.
2. When a flame is detected during the trial for ignition period, the
spark ignitor shuts off and the gas valve remains energized.
3. If no flame is detected by the flame sense circuit, the ignition
control module will go into safety lockout. The valve will be
turned off immediately. If the module has multiple retries and
no flame is detected, the gas valve is de-energized and the
module goes into an interpurge delay. After this delay, the
module will attempt another trial for ignition period. This will
continue until the number of retries has been used up. At that
time, the module will go into safety lockout.
4. Recovery from safety lockout requires one of the following:
a. A manual reset by opening and closing the loading door.
b. After one hour if the control thermostat is still calling for
heat, the module will automatically reset and the trial for
ignition period will start over.
5. Opening the loading door will cause the flame to extinguish.
Closing the door and starting the dryer will restart the trial for
ignition period.
6. Once the control thermostat has been satisfied and/or the
drying timer has been timed out, the ignition control
module(s) will be de-energized, the gas valve(s) will be de-
energized and the flames will extinguish.
7. The machine will continue to run in a cooldown mode without
heat. This process will cool the load to the touch and help to
eliminate wrinkling.
DIRECT-SPARK IGNITION OPERATION
DIRECT SPARK
IGNITION
OPERATION