What is the function of the start switch?

The start switch plays a crucial role in initiating the operation of a burner by sending power to the START windings of the motor. When activated, the start switch energizes these windings, allowing the motor to begin its operation and ultimately enabling the burner to fire and function correctly. This is essential in the starting phase of the burner operation, ensuring that the burner has the necessary power to begin generating heat.

The other functions listed, such as controlling ignition timing, regulating fuel flow, and turning off the burner, involve different components and processes within an oil heating system and do not pertain to the initial operation triggered by the start switch.