What type of control starts and stops the burner based on steam pressure?

The correct answer is on/off pressure control, which is designed specifically to regulate the operation of the burner based on steam pressure levels. This type of control monitors the pressure within the boiler system; when the pressure drops below a specified setpoint, the control activates (or starts) the burner to generate more steam. Conversely, once the desired pressure is achieved, the control will deactivate (or stop) the burner to prevent over-pressurization. This cycle ensures that the boiler operates efficiently, maintaining steam pressure within the required limits.

Manual control depends on personnel to start and stop the burner, which requires constant attention and could result in inefficient operation or operator error. Variable control refers to systems that adjust the burner output continuously rather than simply starting and stopping it, making it unsuitable for applications that only require basic on/off operation based on pressure. Temperature control focuses on regulating the temperature rather than pressure and does not directly manage the steam output in relation to pressure fluctuations, which is essential in maintaining system integrity and efficiency.