What does "purging" an oil burner mean?

Purging an oil burner refers to the process of removing unburned oil and air from the combustion chamber before ignition. This is a critical safety measure designed to prevent puffbacks, which can occur when there's an accumulation of fuel and air that ignites suddenly, leading to an explosive release of energy. During purging, the area is cleared to allow for a proper air-to-fuel ratio, ensuring that the burner operates efficiently and safely.

This process is vital because any unburned oil can create hazardous conditions if it ignites unexpectedly. Proper purging enhances the efficiency of the combustion process, minimizes soot production, and reduces the risk of carbon monoxide buildup. Understanding this concept is essential for safe and effective operation of oil heat systems, as it directly relates to the operational safety and longevity of the equipment.