What level of vacuum is considered proper when using a micron gauge on a system?

When using a micron gauge to evaluate the vacuum level of a refrigeration system, a reading around 500 microns is generally considered indicative of a proper vacuum level for most refrigeration applications. Achieving a vacuum at this level ensures that most of the moisture and non-condensable gases have been removed from the system, which is crucial for effective system performance and longevity.

Lower readings, such as those indicated by 300 microns, might be targeted for specific high-performance applications but can be more challenging to achieve consistently and might not be necessary for typical setups. Similarly, higher readings like 750 microns or 1000 microns indicate that the system still contains some moisture or air, which can negatively impact the efficiency and reliability of the refrigeration system. Therefore, aiming for around 500 microns strikes a balance, ensuring the system is effectively evacuated without requiring more complex processes aimed at achieving lower vacuum levels.