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  1. #66
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by tvpbnl View Post
    Yes, POE is very hydroscopic. On this job the unit was open to the atmosphere. New dryers are installed. To minimize the POE coming in contact with moisture, evacuate your system after leak checking. Since we have a measured amount of oil you can break the vacuum by drawing out the oil before adding the new refrigerant.
    If you suspect contaminated oil (Haven't run across that a whole hell of a lot) change it before pulling a vacuum. Why open the system after!

  2. #67
    Join Date
    Jul 2012
    Posts
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    I do oil changes before the evac. Oils do mix. Dont believe the hype.

  3. #68
    Join Date
    Feb 2017
    Location
    New York
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    Quote Originally Posted by captaincompressor View Post
    I do oil changes before the evac. Oils do mix. Dont believe the hype.
    Same here, I always pull on fresh oil! I do a bit of chiller work. Even with mineral oil, you should see how much comes out of it when the vacuum gets deep through the sight glass.

    Sent from my SM-G935U using Tapatalk
    -----Stop, step back, relax and have another go at it.-----

  4. #69
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    23,065
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    Quote Originally Posted by BennyD View Post
    Same here, I always pull on fresh oil! I do a bit of chiller work. Even with mineral oil, you should see how much comes out of it when the vacuum gets deep through the sight glass.

    Sent from my SM-G935U using Tapatalk
    Chillers are a completely different story!

  5. #70
    Join Date
    Feb 2017
    Location
    New York
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    Quote Originally Posted by pecmsg View Post
    Chillers are a completely different story!
    I know, just making a reference that even if the oil is fresh out of a container, there still may be some crap in it.

    Sent from my SM-G935U using Tapatalk
    -----Stop, step back, relax and have another go at it.-----

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