Which component works with the operating control to maintain the burner firing rate?

The component that works with the operating control to maintain the burner firing rate is the modulating control. This device adjusts the flow of fuel and air to the burner based on the demand for heat in the system. By regulating the burner firing rate, the modulating control ensures that the boiler operates efficiently, meeting the required load while minimizing fuel consumption and emissions. This dynamic adjustment is essential for maintaining stable temperature and pressure conditions within the boiler system.

In contrast, high limit controls are designed to shut down the burner when unsafe conditions are detected, ensuring safety rather than regulating firing rate. Safety valves function to release excess pressure and protect the boiler from overpressure situations, but they do not engage in controlling the firing rate. Feedwater controls are involved in maintaining the appropriate water level in the boiler but do not directly influence the burner operation. Hence, the modulating control is the key component for adjusting the burner firing rate in response to varying heating demands.