What is the recommended pressure range for preventing air accumulation in an idle low pressure refrigeration system?

To prevent air accumulation in an idle low pressure refrigeration system, it's essential to maintain the system at a pressure slightly above atmospheric pressure. This helps to prevent the ingress of air and moisture, which can lead to operational issues such as reduced efficiency, potential component corrosion, and decreased cooling capacity.

When the pressure is slightly above atmospheric, it creates a barrier that makes it difficult for air to enter the system. This is particularly important in low pressure systems because they can be more susceptible to air leaks due to their operational characteristics. By maintaining this pressure, you can ensure that the system remains free of contaminants, thereby enhancing its longevity and performance.

In contrast, pressures at atmospheric or below would not provide the necessary barrier to prevent air and moisture from entering, leading to potential damage and inefficiencies in the refrigeration cycle. Maintaining a pressure well above atmospheric is unnecessary and could potentially lead to stress on system components and a greater risk of leaks. Thus, keeping the system slightly above atmospheric pressure is the optimal strategy for air accumulation prevention.