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Spark Electrode Assembly-Function

Step 1: The spark electrode and sensing electrodes are located directly at the side of

the burner housing.

Step 2: The electrode with the black hi-voltage wire conducts the spark to the center

grounding probe, directly over the burner.

Step 3: The electrode with the black sensing wire detects ignition and monitors ame

by signaling the module.

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. From the 24VAC control transformer, voltage for the heat circuit is applied to the control through the

door switch. If the control detects that the heat should be on, a circuit is closed providing power through

the over-temp thermostat, the air damper switch, the high limit switch and the motor centrifugal

switch to the Ignition Module.

3. Once the 24VAC reaches the ignition

module on the red, sparking occurs at

the ignition electrode and 24VAC

is applied to open 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

immediately 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.

Part # 8533-112-001 7/21

Dexter Laundry B Series Parts & Service Manual

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