Which factor is crucial when selecting a pump for evacuating refrigeration systems?

When selecting a pump for evacuating refrigeration systems, the vacuum level achievable is a crucial factor because it directly impacts the effectiveness of the evacuation process. A pump must be capable of reaching a sufficiently low vacuum level to remove moisture and non-condensable gases from the refrigeration system. If the vacuum level is not adequate, residual contaminants can remain, potentially leading to inefficient system performance or failure.

Achieving the right vacuum level helps ensure that the system operates properly, maintaining the integrity of the refrigerant and preventing issues like ice formation or compressor failure due to liquid refrigerant returning to the compressor. Therefore, the ability of the pump to reach the required vacuum level is fundamental to the successful evacuation and overall longevity of the refrigeration system.