Igniters

Rectification Igniters:
United States Patent No. 6,808,389

The rectification ignitor is designed to provide highly reliable burner ignition when used with a DSI system. It is constructed to spark to itself, direct fuel to the ignition point, and provide minimum capacitive load on the ignition system. The ignitor design allows independent adjustment of the rectification gap and ignition points, and provides a favorable rectification environment through all rates of fire. The spark gap is present within the ignitor, so the burner will always light. It is simple to install and maintain, and its adjustment is less critical under adverse operating conditions.

Benefits:

• Standard Rajah connectors
• Long service life nichrome ignitor materials
• Less susceptible to graphite contamination
• Reliable operation with dual ignitor grounding points
• Specially-designed gimbaled mounting fixture maintains burner and ignitor spacing as the burner bows with heat
• Custom-made set screws facilitate proper ignitor tightening
• Special construction allows the ignitor assembly to expand and contract

Specifications:

• Fit to any application
• Fits all traditional Baker-Perkins and APV style head plates
• Fits most left- or right-hand ovens
• Accommodates most head plates using B-D mounting accessories
• Uses traditional B-P "S" type mounting bracket (240 X 0320)

Note: As with all DSI module applications, the module manufacturer's recommendations must be understood and followed.

Bent Rod ignitor

The rod type ignitor was the initial solution to problems associated with DSI ignition systems. Bent rod ignitors overcame the following problems with existing ignitor systems.

• Mass of the flag was no longer required and furthermore, did not help as the ratio between the ground (burner) and the igniter, which when sensing the flame, needs to be at least 10:1.
• "Spring" attachment for the ignitor was found to be detrimental to the new DSI systems because the ignitor is designed to provide the ignition spark and sense the flame. This required precise placement of the ignitor tip in the flame, and if not rigidly fastened to the burner head plate, resulted unfavorable performance.

Even after rigidly mounting the ignitor to the head plate, an easy method to adjust the ignitor was still needed. The rod igniter, although not perfect, thus far has been the answer to these problems.

Flag Igniters: (for constant spark systems)

The flag type ignitor was developed to reduce "carbon whiskers." Carbon whiskers occur when the repetitive spark of the ignition transformer creates intense heat, turning hydrocarbons in the fuel into solid carbon pieces between the ignitor and the burner. The solid carbon causes the transformer to short and stop sparking.

The development of carbon whiskers is reduced by allowing the spark to take place over the length of the flag, as opposed to the same spot where spark intensity would develop.

However, since electricity follows the path of least resistance, the spark tends to follow a consistent path and the whiskers may continue to form. Adding a spring device to the outside of the ignitor bushing provided a method to break the whiskers by squeezing or pushing a lever. The spark would return and the burner would re-light.

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