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  1. #1
    Join Date
    Jun 2005
    Location
    Colorado
    Posts
    34

    Maximum pump-down

    Doing a pump-down in a residential split unit a/c, not heat pump, is there a maximum amount of refrigerant that can be safely held in the condensing unit?? I remember seeing some older Lennox units with warnings about not doing a pump-down because it could damage the compressor. If there is a limit how is that limit determined?

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,506
    Quote Originally Posted by hvac meister View Post
    Doing a pump-down in a residential split unit a/c, not heat pump, is there a maximum amount of refrigerant that can be safely held in the condensing unit?? I remember seeing some older Lennox units with warnings about not doing a pump-down because it could damage the compressor. If there is a limit how is that limit determined?
    Heck the old recips you could pump down into a vacuum, Scroll I don't go below a 20 lb suction.
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