What determines the direction of rotation in a single-phase induction motor?

The direction of rotation in a single-phase induction motor is determined by the direction of current flow through the start winding. In these types of motors, the start winding creates a magnetic field that interacts with the current in the main winding. To create the necessary rotating magnetic field, the current flowing through the start winding must be in a specific direction. By changing the connections to the start winding, you can reverse the direction of the current flow, which in turn changes the magnetic field's rotation direction, resulting in the motor rotating in the opposite direction.

Understanding this principle is crucial for troubleshooting and operational tasks involving single-phase induction motors, as reversing the connections can be a straightforward method to change the motor's rotation without needing additional equipment or modifications. This concept is fundamental to the workings of single-phase motors and is essential for HVAC technicians to grasp in their field.