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

The function of a start switch in a PSC (Permanent Split Capacitor) burner motor is to assist in starting the motor. In PSC motors, the start switch plays a critical role in providing the initial phase shift required for the motor to begin rotating. Once the motor reaches a certain speed, the switch will typically become inactive, allowing the motor to operate continuously without additional resistance. This mechanism is essential for facilitating smooth starts while maintaining efficiency during normal operation.

In the context of the other options, regulating flow pertains to managing the amount of fuel or air entering the combustion system, which is unrelated to the function of a start switch. Controlling speed generally involves varying the input voltage or using variable speed drives, which also does not correspond to the role of the start switch. Likewise, monitoring temperature involves sensing the operational temperature within the heating system and is generally managed by thermostats or temperature sensors, rather than the start switch in the motor. This highlights how each component in an oil heating system has a distinct function that contributes to overall system performance.