Which line is used to supply power for the post purge circuit?

In an oil heating system, the post purge circuit is crucial for removing any residual combustion gases from the burner after it has been turned off. This helps to ensure safety and improve efficiency. Line 1 is typically designated as the power supply line for the post purge circuit. It connects to the control system to activate the fan and allow for the necessary ventilation after the main burner stops operation. By using Line 1, the system can ensure that the combustion chamber is cleared of any leftover gases, thereby reducing the potential for backdraft or buildup of harmful substances within the furnace. Understanding the role of Line 1 in the post purge circuit is essential for technicians as it is directly tied to the safe operation of oil heating systems.