What is the main function of the start switch in an oil burner?

The main function of the start switch in an oil burner is to send power to the start windings. In an oil burner, when the start switch is engaged, it completes the electrical circuit needed to power the start windings of the burner’s motor. This action initiates the motor's operation, allowing the oil pump and oil burner to begin their processes.

The start windings create a magnetic field that facilitates the initial rotation of the motor to get it running. Once the motor reaches a certain speed, the start windings are usually disconnected, relying on the run windings to maintain operation. This process is crucial for ensuring that the burner starts efficiently and effectively begins the combustion process.

In contrast, options like controlling fuel flow, regulating temperature, or activating a safety valve pertain to different functional aspects of the burner system. While they are important for the overall operation and safety of the heating system, they do not relate specifically to the role of the start switch.