MACS 609 Certification Practice Exam

How much moisture is typically removed from a mobile A/C system during evacuation?

1. A significant amount

2. Possibly none

3. A moderate amount

4. All present moisture

The correct answer is: Possibly none

In the context of evacuating a mobile A/C system, it's important to understand the purpose and process of evacuation. The primary goal of evacuation is to remove non-condensables and moisture from the system to ensure efficient operation. However, during the evacuation process, the system's existing moisture may not be fully removed, leading to the conclusion that it might be possible to remove none, particularly if the evacuation process is not performed optimally or if there are leaks present in the system. When vacuuming a mobile A/C system, existing moisture in the form of water or moisture content in refrigerants can be present. The extent to which this moisture is removed depends heavily on the duration of the evacuation and the quality of the vacuum pump used. If the evacuation time is inadequate or there are limitations within the system itself, it's feasible that no moisture is effectively extracted. Overall, while some moisture can certainly be removed during the evacuation process, stating that possibly none is removed indicates a realistic scenario where improper practices or system conditions might lead to that outcome. This highlights the necessary precautions and thorough methods required in the A/C service industry to ensure as much moisture as possible is drawn out.