What is the purpose of a pressure switch in refrigeration systems?

The purpose of a pressure switch in refrigeration systems is to monitor and control system pressure, ensuring safety by protecting against both underpressure and overpressure conditions. Pressure switches are critical components that help maintain optimal operating conditions within the system.

When the pressure within the system falls outside of a predetermined range, the pressure switch can activate or deactivate the compressor or other components. This action prevents potential damage from issues such as low refrigerant levels, which can cause the compressor to run inefficiently or even seize, or high pressure, which could lead to ruptures or other failures in the system.

Maintaining the correct pressure not only ensures system efficiency but also extends the lifespan of the equipment, contributing to reliable operation. Other options, while related to the system's functionality, do not specifically address the critical role of the pressure switch in monitoring and responding to pressure variations. For example, maintaining constant refrigerant flow, regulating temperature in the evaporator, and measuring refrigerant levels involve other components and mechanisms within the refrigeration cycle.