Performing an evacuation on an AC, refrigeration system or commercial chiller to below 500 microns is essential to it’s future performance. Pulling an efficient evacuation requires removing as many restrictions as possible and using large diameter hoses. In the video we race to 500 microns on a chiller that had a compressor change and acidic oil. Schrader cores were removed, large diameter evacuation hoses were implemented and a 12 cfm vacuum pump was put to work.
Check out this article which helps explain this process in more detail.
https://www.hvacknowitall.com/blogs/blog/567966-the-science-of-evacuation-and-on-site-pull-down#.X6kwY2lyaDY
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