When comparing two pressure measurements from different evaporators, one with an EPR and another without, which typically has a higher pressure measurement?

The evaporator equipped with an EPR (Electronic Pressure Regulator) typically has a higher pressure measurement compared to the evaporator without one. This is largely due to the function of the EPR, which is designed to maintain a specific pressure in the evaporator by regulating the flow of refrigerant based on the pressure readings.

When an EPR is in place, it actively controls the evaporator pressure to optimize performance, ensuring that it operates within an efficient range. This control prevents the pressure from dropping too low, which can occur when the evaporator experiences lower load conditions; thereby, maintaining a higher average pressure.

In contrast, the evaporator without an EPR lacks this regulation mechanism, which can lead to more variable pressure readings influenced by load changes, resulting in potentially lower pressures during certain operating conditions.

Overall, the incorporation of an EPR allows for better stability and management of evaporator pressure, thus explaining why the higher pressure measurement is typically observed in the evaporator with an EPR.