De Dietrich S62743 ignition plug

De Dietrich S62743 ignition plug. Catalogue article 336.946.026, manufacturer code S62743. This part is an ignition plug, which belongs to the category of ionization and ignition electrodes used in burners and boilers. An ignition plug of this type delivers the spark that lights the fuel-air mixture in the combustion chamber. It is connected to the ignition transformer, which provides the high-voltage pulse. The plug is mounted so that its tip sits in the flame zone, making it a consumable component subject to thermal and electrical stress. Selection of a replacement ignition plug is based on the electrode length and bend, the diameter of the ceramic insulator, the spark gap, the type of mounting flange, and the specific burner series for which the plug was shaped. Using a plug with incorrect geometry can prevent reliable spark formation or cause mechanical interference. Typical failure modes for such plugs include an eroded spark tip, cracks in the ceramic insulator, soot deposits that short the spark, and a gradual widening of the gap that lengthens ignition time. When replacing an ignition plug, inspect the insulator for cracks and the tip for wear. Clean any soot from the ceramic and ensure the gap matches the burner specification. In systems with a pilot burner, the ignition plug may be dedicated to lighting the pilot flame, which then lights the main burner and provides the flame signal for the ionisation electrode.