In HVACR systems, what is the purpose of the run capacitor?

The purpose of a run capacitor in HVACR systems is to enhance efficiency. When a motor operates, it can create a phase lag that can lead to reduced performance. The run capacitor compensates for this lag by creating a more effective phase shift in the electric current supplied to the motor. This results in improved torque production and a smoother operation of the motor, leading to enhanced efficiency of the system. As the motor runs continuously, the run capacitor helps maintain optimal performance and energy consumption, thereby contributing to overall system efficiency.

Other functions, such as starting the motor or preventing overheating, are typically associated with different components, such as a start capacitor or thermal overload protection. Instead, the run capacitor's specific role is focused on maintaining efficient ongoing operation during the motor's run cycle.