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  1. #1
    Join Date
    Jun 2005
    Posts
    42
    I was reading an earlier post about non-condensables and contamination:

    http://hvac-talk.com/vbb/showthread....3&pagenumber=1

    One thing I noticed was some discussion of having nitrogen flowing while brazing. When a new R410A system is installed (before any refrigerant is in the lineset), should nitrogen be flowing during brazing or is it enough to purge with nitrogen after the brazing?

  2. #2
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,852
    An inert gas, such as nitrogen, should be purged through the refrigeration system while brazing in order to replace the contaminated gas that will be present in the system called "air".
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  3. #3
    Join Date
    Aug 2005
    Posts
    3
    flowing nitrogen through the system during brazing will prevent scaling inside the tubing which could cause problems if it were to flow through the system i.e plug a metering device

  4. #4
    Join Date
    Apr 2005
    Location
    NE PA
    Posts
    698
    Actually, nitrogen or other inert gas, prevents oxidation by removing all of the oxygen by displacing it with the inert gas. It is the copper oxide that can get into the system and cause contamination issues. Also most metalic oxides are very hard and can damage sliding members, bearings, etc.

    paul

  5. #5
    Join Date
    Jul 2004
    Location
    Poughkeepsie, Ny
    Posts
    631
    Originally posted by apowers
    I was reading an earlier post about non-condensables and contamination:

    http://hvac-talk.com/vbb/showthread....3&pagenumber=1

    One thing I noticed was some discussion of having nitrogen flowing while brazing. When a new R410A system is installed (before any refrigerant is in the lineset), should nitrogen be flowing during brazing or is it enough to purge with nitrogen after the brazing?
    On a 410A system or any system for that matter needs to have N flowing through the lineset. Use R22 for leaktesting backed up by N.
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