Where is the retention ring typically mounted on an adjustable head oil burner?

The retention ring is typically mounted on the nozzle assembly of an adjustable head oil burner. Its primary purpose is to help create a stable flame by retaining the oil mist at the nozzle, enhancing combustion efficiency and ensuring that the oil is properly atomized and burned.

By being positioned on the nozzle assembly, the retention ring plays a critical role in preventing flame instability and minimizing the risk of flame lifting off the nozzle. This stability is crucial for achieving optimal heating performance and maintaining safety within the burner operation.

The other options do not serve the same function; for instance, mounting a retention ring on the control panel would not have any impact on the combustion process, as the control panel is responsible for monitoring and controlling burner operations rather than directly influencing the combustion flame. Similarly, placing it on the fuel line or the combustion chamber would not facilitate the necessary retention of the oil mist, which could lead to inefficient combustion and potential operational issues.