Ace Your RETA CIRO Exam 2026 – Cool Your Way to Refrigeration Mastery!

In a two-stage package refrigeration system, the low stage compressor discharge pressure is critical for optimal system performance. Typically, this pressure is set according to the required evaporating temperature and the specific design of the system.

In many industrial refrigeration contexts, a low stage compressor discharge pressure of around 31 PSIG aligns with the standard operational guidelines for common refrigerants under typical conditions. This pressure is high enough to allow for efficient heat exchange in the evaporator while ensuring that the system maintains a balance between the low and high stages of compression.

Choosing 31 PSIG reflects an understanding of the pressure-temperature relationship inherent in refrigerant dynamics. It ensures that the system effectively supports the cooling load while minimizing the risk of evaporator freeze-up or compressor inefficiency.

The other pressures listed may not align with the common operational metrics observed in two-stage systems, which is why they are not considered appropriate selections in this scenario.