What does parallel positioning utilize as the controller input?

Parallel positioning utilizes steam pressure as the controller input to ensure efficient operation in steam systems. In steam boilers, maintaining the correct steam pressure is crucial for the stability and efficiency of steam production. Parallel positioning involves controlling multiple burners in relation to the steam pressure demand. By focusing on steam pressure, the system can adjust the fuel supply and combustion air accordingly, ensuring that enough steam is generated to meet the output requirements while optimizing fuel consumption.

This approach contrasts with other factors like water level, which is essential for ensuring that the boiler operates safely and efficiently but does not directly act as the main controller input in parallel positioning. Fuel flow and air temperature also play important roles in the overall system operation, but they are more secondary adjustments to maintain the optimal conditions following the primary control input of steam pressure. Thus, steam pressure serves as the critical input for maintaining the desired operational balance in parallel positioning scenarios.