Which control regulates high and low fire in a burner?

The pressure control is responsible for regulating the high and low fire settings in a burner. This is crucial for maintaining the appropriate combustion conditions. When the system detects a drop in pressure, it signals for the burner to operate at a higher fire rate to increase heat output and maintain pressure. Conversely, if the pressure exceeds the desired level, the control reduces the fire rate to prevent unsafe operating conditions. This fundamental regulation helps ensure efficient operation of the boiler while maintaining safety standards.

In the context of the other controls listed, temperature control is primarily focused on managing the temperature of the steam or water in the boiler system, which does not directly control the burner’s firing rate. Water level control monitors the water level in the boiler and prevents inadequate water levels that can lead to overheating and damage, but it does not manage the firing intensity of the burner itself. Flow control manages the rate of fuel or air entering the burner but does not directly adjust the burner’s fire settings as pressure control does.