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Thread: low temp drop

  1. #1
    Join Date
    Feb 2004
    Posts
    80

    low temp drop

    was introduced to my new problem today. brand new unit. 2 cicuits. #1 15 degree SH and 12degree SC. #2 24degree SH and 21 degree SC. Only 10 degrees across coil. I would think #1 is OK but #2 having both high SH and SC has got me puzzled. Unit is for a gas station with a little food area. There is a hood exhaust and make up which appear to be ok. Unit never gets to set pt

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,552
    Restriction?

  3. #3
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    476
    Sounds like ckt 2 has a restriction, look for a temp drop on the liquid line. Check the filter drier and condenser. Does it have a TXV or fixed orifices?

  4. #4
    Join Date
    Feb 2004
    Posts
    80
    fixed orifice

  5. #5
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,369
    What are the pressures?

  6. #6
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,552
    Could have installed the wrong size piston in that circuit

  7. #7
    Join Date
    Feb 2004
    Posts
    80
    I honestly didnt check for a restriction but havin a hard time thinkin it would cause High SH and SC

  8. #8
    Join Date
    Feb 2004
    Posts
    80
    #1 135/355
    #2 125/385


    410 freon

  9. #9
    Join Date
    Feb 2004
    Posts
    80
    47degree suction temp 95 degree liquid on circuit#1

    43degree suction and 91 degreeliquid #2

  10. #10
    Join Date
    Feb 2004
    Posts
    80
    could be a restriction. now that im looking at the numbers

  11. #11
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,369
    Could it be overcharged?

  12. #12
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,369
    If this is a package unit, I would weigh the charge.

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