Which component is NOT typically used for controlling the flow of refrigerant in an AC system?

The component that is NOT typically used for controlling the flow of refrigerant in an AC system is the capacitor. Capacitors are electrical components that store and release energy, often used to help start and run motors within the system, including the compressor. They do not play a role in controlling the refrigerant flow.

In contrast, the expansion valve, compressor, and condenser all have specific functions related to refrigerant flow. The expansion valve precisely regulates the amount of refrigerant that enters the evaporator, allowing for proper cooling efficiency. The compressor is responsible for compressing the refrigerant gas and moving it through the AC system, thereby influencing the flow. The condenser acts as a heat exchanger where the refrigerant releases heat and changes from a gas to a liquid, which also plays a role in the overall flow of refrigerant in the system.

Understanding the purpose of each component is critical for technicians, as it helps to diagnose issues and maintain the efficiency of AC systems.