Which practice helps to prevent air accumulation in an idle low-pressure refrigeration system?

Maintaining system pressure slightly above atmospheric is a crucial practice to prevent air accumulation in an idle low-pressure refrigeration system. When the system's pressure is kept slightly above atmospheric pressure, it helps ensure that there is no influx of moist air or contaminants into the system.

Air can create issues like inefficiency or even damage due to moisture and non-condensable gases. By keeping the pressure raised, it creates a barrier that minimizes the risk of these elements entering, thereby ensuring the integrity of the refrigerant and overall system health during periods of inactivity.

Additionally, this practice can also facilitate better operational readiness, as the system does not have to work as hard to reach the necessary pressure and temperature levels when it is later put back into operation. Overall, maintaining proper pressure is a fundamental component of effective refrigeration maintenance.