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

The retention ring is specifically mounted on the nozzle electrode assembly of an adjustable head oil burner. This component plays a critical role in the combustion process by helping to stabilize the flame. The retention ring ensures that the oil is atomized properly and helps maintain the desired cone shape of the flame, which is essential for efficient combustion and heat transfer.

The placement of the retention ring on the nozzle electrode assembly directly influences how well the burner operates, as it affects fuel delivery and combustion stability, thus optimizing burner performance. Proper installation and functioning of the retention ring contribute to the burner’s overall efficiency and reduce the emissions produced during operation.

In contrast, the other options do not serve the same specific function as the retention ring. The burner motor assembly largely involves the mechanical components that drive fuel and air to the nozzle, while the fuel filter assembly's role is to clean the fuel before it reaches the burner. The oil storage tank is the reservoir for the fuel and is not involved in the combustion process itself, making it unrelated to the function of the retention ring.