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  1. #1
    Join Date
    Feb 2013
    Location
    north georiga
    Posts
    645

    moisture vapor in the line set

    purging n2 while brazing prevents carbon from forming and if purge is continued until all braze joints are cooled back down to ambient temperature moisture from surrounding air can not intrude into line set, if bone headed know-it-all installers don't/won't use n2 there by allowing humid air to be drawn back into line set and no vacum is pulled because there is no o.d. unit to be set at the time, some oxidation will form inside the line set. poe oil will "clean" this oxidation off the interior walls of the tubing, given that moisture caused the oxidation can acid still occur due to the same moisture? long winded i know but i'm trying to be clear about my question.

  2. #2
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    403
    Moisture doesn't cause oxidation, only oxygen does, even if you purge with n2 while brazing you should still pull a vacuum to below 500 microns. Or in other words the right way.

  3. #3
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    Moisture left in the system gets absorbed by POE oil and forms an acid. That acid tends to stay in the liquid oil in the compressor and eats away at windings causing a burnout

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,591
    There will always be some moisture that got into the line set. After vacuuming, the LLFD is what will remove any moisture that may have been left by the vacuum.
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  5. #5
    Join Date
    Mar 2013
    Location
    Joplin,Missouri
    Posts
    310
    Pull a 500 micron vvacuum use a good liquid line drier and you shouldnt have to worry about moisture

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