What function does the fuel oil return line serve during warm-up procedures?

The fuel oil return line plays a crucial role in the warm-up procedures of a boiler system by circulating fuel oil. This circulation helps to adequately warm the fuel oil before it reaches the burner, ensuring that it achieves the right viscosity for efficient atomization and combustion. When fuel oil is circulated, it helps to maintain a consistent temperature throughout the system, reducing the risk of temperature stratification and allowing for better control over the combustion process.

During warm-up, it is important to have the fuel oil at an optimal temperature to prevent issues such as incomplete combustion or burner malfunctions. Therefore, the function of circulating fuel oil serves not only to ensure proper flow but also to facilitate effective warming of the fuel, contributing to a safer and more efficient boiler operation.