What is the function of the start switch in a burner motor?

The function of the start switch in a burner motor is to enable the start windings. In a split-phase motor, which is commonly used in oil burner applications, the start switch temporarily energizes the start windings to provide an initial boost of torque necessary for the motor to overcome inertia and begin turning. Once the motor reaches a specific speed, the start switch opens, cutting off power to the start windings. This allows the motor to run efficiently on the run windings only, maintaining the required performance while preventing overheating or damage that could occur from keeping the start windings energized for an extended period.

This is crucial for the smooth operation of the burner, as a motor that does not start properly can lead to failures in the ignition and operation of the oil burner system, impacting heating efficiency and safety.