What is the function of an EP switch in refrigeration systems?

The function of an EP switch, or electrical pressure switch, in refrigeration systems is to monitor and control the pressure within the system. When the pressure reaches a predetermined level, the switch sends an electrical signal to activate or deactivate certain components, such as the compressor or fan. This is crucial for maintaining the proper functionality of the refrigeration cycle and protecting the system from damage that can occur due to pressure fluctuations. The pressure change triggered by the electrical signal is fundamental to how the EP switch operates, as it dynamically adjusts system performance based on actual operating conditions.

The other choices do not accurately represent the primary role of the EP switch. For instance, controlling temperature using digital signals pertains more to digital thermostats or control systems rather than an EP switch. Regulating fluid flow based on thermal readings relates more to thermal expansion valves or other flow control devices, and operating under low voltage conditions does not specifically capture the main function of the EP switch, which is directly linked to pressure monitoring and signaling within the refrigeration circuit.