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Thread: Superheat help

  1. #1
    Join Date
    Dec 2011
    Posts
    2

    Superheat help

    Guys, Im going brain dead! To decrease superheat, close the TXV or open, Ive been up for a while, going back on this job tomorrow, it is a touchy one, cant quite get it dialed in...please advise

  2. #2
    Join Date
    Nov 2009
    Posts
    384
    Maybe I'm wrong, but I think you want the AOP section of the site.
    "Don't wish it were easier, wish you were better"

  3. #3
    Join Date
    Jul 2011
    Location
    St. Louis
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    121
    For SporlanTEVs-"opening" will reduce superheat. I say opening because what it really does is reduce the spring pressure that is trying to close the valve.
    Looking at the stem, from the bottom, righty tighty- lefty loosy. Counter clockwise to reduce the spring pressure and lower superheat.
    Don't make big changes- maybe 1/4 to 1/2 turn at a time and let the system settle out. Make a note of what you did, you may want to return to that setting after you find other problems on the job.
    In an infinite universe, not only are all things possible, all things are necessary

  4. #4
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    For all TXV's and superheat adjustment, remember this when adjusting the stem... IN INcreases superheat.

    Then do exactly what BDOLIN said concerning making a minor adjustment and monitoring the reaction. I takes time to settle it out.

  5. #5
    Join Date
    Apr 2011
    Location
    Northeast Illinois
    Posts
    83
    I dont trust other peoples work when it comes to txvs. A flooded coil can show what looks like superheat. I have had many cases of people giving it a turn and not knowing what they were doing. I always turn the valve in all the way, then back out two turns, if you can shut the liquid off and pump the coil down its better. This will give you a clear coil and accurate SH reading, then adjust as needed, slowly as it takes time

  6. #6
    Join Date
    Jul 2011
    Location
    St. Louis
    Posts
    121
    Your procedure should help clear out any liquid in the coil but be careful of the 2 turn rule. Different models from different manufacturers have different numbers of turns to their superheat adjustment. Most valves are set about midpoint at the factory. Turn the stem all the way in and then count the turns when backing out until resistance is felt. Halfway in will usually be a good starting point.
    CAUTION; WHEN BACKING OUT STOP WHEN RESISTANCE IS FELT.If you don't you may permanently damage the valve or have a stem in your hand and no charge in the system.
    In an infinite universe, not only are all things possible, all things are necessary

  7. #7
    Join Date
    Apr 2011
    Location
    Northeast Illinois
    Posts
    83
    My customers run Sporlan and Danfoss valves, never had a problem with starting at two turns out.

  8. #8
    Join Date
    Jul 2011
    Location
    St. Louis
    Posts
    121
    Quote Originally Posted by wicked251 View Post
    My customers run Sporlan and Danfoss valves, never had a problem with starting at two turns out.
    Agree, better to start with a higher superheat and work your way down than try to catch up to a flood.
    Just a suggestion as to how to return close to the factory setting.
    In an infinite universe, not only are all things possible, all things are necessary

  9. #9
    Join Date
    Dec 2011
    Posts
    2

    Thanks Everyone

    Guys, thanks a million, Im sure we all have had those moments when we doubt what we know, this was the case indeed! I needed to lower the suction line temp to bring down the temp, thus lowering the superheat, that is what I went ahead and did. I appreciate all the comments. Blessings to a New Year.
    BryantMan

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