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  1. #1
    Join Date
    Dec 2010
    Location
    new jersey
    Posts
    366

    sight glass or moisture indictor? is the question.

    I believe I read once that, on a hill rack they used to use a sight glass,but, it is NOT inline w/ the liquid line, but, instead it has 2 -1/4 " lines that attach it to the side of the liquid line.

    Is it true that this style of piping the s/g it is used solely for moisture indicating only and NOT for determining liquid content.

    I can try and dig out my old Hill books, but I'm trying to avoid that If possible.
    Last edited by sprmktrefertech; 03-21-2012 at 08:51 PM. Reason: wording

  2. #2
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066

  3. #3
    Join Date
    Dec 2010
    Location
    new jersey
    Posts
    366
    yes, exactly what I mean...

    Thanks, Phase Loss.

  4. #4
    Join Date
    Dec 2011
    Posts
    107
    is it a 3/8 line? thats how they did it way back,something to look at and a lot less than a saddle type.

  5. #5
    Join Date
    Aug 2006
    Location
    Columbus Ohio
    Posts
    2,011
    When you start getting into the large pipe they use the "bypass" to cut down on cost. Can you imagine the price tag on a 2" moisture indicator fitting?

    It is used solely for moisture indication not as a liquid indicator.
    UA LU189

    10mm, because it's better than .45acp

  6. #6
    Join Date
    May 2008
    Location
    brooklyn ny
    Posts
    103
    yes you are right those hill rack have a sight glass on the liquid line that is a 1/4ins line connected to the shightglass at the side of liquid line so that a mositure indicater did not know that throught that was for liquid.

  7. #7
    Join Date
    Sep 2008
    Location
    Cedar Rapids, IA
    Posts
    486
    Quote Originally Posted by zw17 View Post
    When you start getting into the large pipe they use the "bypass" to cut down on cost. Can you imagine the price tag on a 2" moisture indicator fitting?

    It is used solely for moisture indication not as a liquid indicator.
    If installed as recommended it will indicate liquid. The turbulence caused by the small lines and curves will cause liquid with low subcooling to flash in the glass more than the relatively open path in the larger pipe.

  8. #8
    Join Date
    May 2008
    Location
    brooklyn ny
    Posts
    103
    but in the newer rack they do have sightglass in the liquid line weather it 7/8 1 1/8

  9. #9
    Join Date
    Dec 2011
    Posts
    107
    sightglasse's are nice to look at but subcooling is the best way to check charge.

  10. #10
    Join Date
    Mar 2005
    Posts
    664
    it will indicate solid column as well
    Keep it simple to keep it cool!

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