How does a pressure switch function in a refrigeration system?

A pressure switch plays a crucial role in a refrigeration system by opening or closing an electrical circuit based on the pressure of the refrigerant. This functionality is important for maintaining the proper operation and safety of the system.

When the pressure of the refrigerant reaches a predetermined set point, the pressure switch responds by either allowing or interrupting the flow of electricity to various components of the system, such as compressors or fans. For example, if the pressure exceeds safe operating limits, the pressure switch will open the circuit, which can shut down the compressor to prevent damage. Conversely, when the pressure drops below a certain level, the switch can close the circuit, enabling the compressor to start back up and maintain effective operation of the refrigeration cycle.

This mechanism provides essential feedback to the system for operational stability and safety, ensuring that pressure levels remain within the specified range to avoid situations that could lead to equipment failure or inefficiency.