Which device ensures that the evaporator pressure remains above a certain point regardless of suction pressure?

The evaporator pressure regulator is designed to maintain the evaporator pressure above a specific threshold, ensuring optimal operation of the refrigeration system. This device senses the pressure within the evaporator and adjusts the flow of refrigerant accordingly. By doing so, it prevents the evaporator from dropping below the predetermined pressure point, which is essential for maintaining efficient heat exchange and preventing issues such as refrigerant flooding.

This regulator plays a critical role in refrigeration and air conditioning systems, especially under varying load conditions. By ensuring that the evaporator pressure is kept stable, it directly contributes to the system's overall efficiency and performance.

In contrast, other devices like an oil separator primarily focus on separating oil from the refrigerant in order to protect compressor components, while fan cycling control manages fan operation to maintain desired temperature levels or conditions. Crankcase pressure regulators are used to regulate the pressure in the compressor’s crankcase, which serves a different purpose from maintaining evaporator pressure.