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  1. #1
    Join Date
    Apr 2005
    Location
    dallas
    Posts
    19

    Question

    Can I put a sight glass on a split system with a piston?If no why not?

  2. #2
    Join Date
    Nov 2003
    Posts
    501
    Can you put one on? Sure.

    Will it do you any good whatsoever? Nope.

  3. #3
    Join Date
    Apr 2005
    Location
    dallas
    Posts
    19
    I've been told that you only put them on txv systems.

  4. #4
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,506
    Originally posted by dorrmann
    Can you put one on? Sure.

    Will it do you any good whatsoever? Nope.
    So if it won't do you "any good" whatsoever, Well Boss have you got some other way to tell if you might have moisture in the system? O yes forgot you can take a freon sample down to the chemist and he can test it for you.
    __________________________________________________ ____________________________
    “Reality is merely an illusion, albeit a very persistent one.” –Albert Einstein

    “Experience is a hard teacher because she gives the test first, the lesson afterwards.”-Vernon Law

  5. #5
    Join Date
    Apr 2005
    Location
    dallas
    Posts
    19
    Will I overcharge the system if i clear the sight glass on a piston or cap tube system?

  6. #6
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579


    Using a sight glass as an indicator of a correct charge is never reliable for any system no matter what type of metering device you have. However, it is very unreliable as a charge indicator on fixed metering device systems.

    The only real value a sight glass has is for its moisture indicator.

    What method are you currently using to charge systems?


  7. #7
    Join Date
    Apr 2005
    Location
    dallas
    Posts
    19
    Subcooling on a txv and superheat on a fixed metering devise.

  8. #8
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Originally posted by 123456
    Subcooling on a txv and superheat on a fixed metering devise.
    This is the ONLY way...
    How tall are you Private???!!!!

  9. #9
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579
    Originally posted by 123456
    Subcooling on a txv and superheat on a fixed metering devise.
    OK, then you have no need to install a sight glass for charging purposes do you.


  10. #10
    Join Date
    Apr 2005
    Location
    dallas
    Posts
    19
    I know a contractor that is having all his installers put a sight glass on every install.You know that everyone will clear the sight glass when they are charging a system.They will assume there is a txv.If they charge a piston system this way im afraid they will overcharge the system.We know what happens when to much liquid gets back to our pump.

  11. #11
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Yeah, more service work for you!
    How tall are you Private???!!!!

  12. #12
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    [QUOTE]Originally posted by NormChris
    [B]


    The only real value a sight glass has is for its moisture indicator.




    have seen green moisture indicator on water cooled system flooded with water. i have no faith in them. only use for sightglass is reciever equipped refrigeration unit


  13. #13
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579
    [QUOTE]Originally posted by t527ed
    [B]
    Originally posted by NormChris



    The only real value a sight glass has is for its moisture indicator.




    have seen green moisture indicator on water cooled system flooded with water. i have no faith in them. only use for sightglass is reciever equipped refrigeration unit


    You obviously had a defective moisture indicator in that sight glass. Don't condemn all moisture indicators based upon one defective one. Something was obviously very strange and out of the ordinary there.

    Norm

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