What is a bypass flame?

A bypass flame refers to the smallest flame that is sufficient to keep a burner completely lit. It is essential for the proper operation of gas burners, particularly in maintaining a flame when the main burner is not in use or in low-fire situations. The bypass flame ensures that there is a continuous ignition source ready for when the main burner is activated. This flame typically operates at the lowest setting necessary to prevent the main burner from extinguishing, thereby maintaining the efficiency and safety of the appliance.

Understanding the bypass flame is critical for technicians, as it is an indicator of the system’s proper functioning and helps to prevent issues related to burner performance. When the bypass flame is stable, it indicates good gas flow and efficient burner function, while if the flame is too large or too small, it could indicate potential malfunctions that may require investigation.