I took this a couple years back, poking fun at "fake" technician images that marketers like to use in ads to promote the trades. The joke behind it stems from my experience and probably a lot of yours where an evacuation was down to 29.92" inches of mercury and call it (2 smokes and a coffee), I don't smoke btw lol. It's crazy how times change, with POE oil being hygroscopic, meaning that it takes on water, a proper evacuation is super important to the life of a system. Heat and moisture can create acid, acid can leach copper alloys from system parts, piping, etc. That copper gets deposited on compressor scroll sets, valves, etc and can cause damage that lead to pre mature failure. Moral of the story, pull a deep vacuum, add a filter drier and keep the system from over heating by maintaining cleanliness. If these things are done along with nitrogen brazing and keeping piping free of burrs and filings. I think this is 90% of system longevity. Contactors, capacitors, compressor starting components and electrical connections are some other things that can cause over heating of a compressor, making sure they are working and free of pitting, carbon, and electrical connections are tight should cover the other 10%. Just my thoughts....#teachme Happy HVACing!

Posted by HVAC Know It All at 2021-04-11 13:11:12 UTC