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Thread: Trane RTA

  1. #14
    Join Date
    Jan 2004
    Posts
    1,174
    Thats pretty good because it is a shell and coil evaporator, not shell and tube.

  2. #15
    Join Date
    May 2007
    Location
    Michigan
    Posts
    313

    Hey guys got it fixed

    Sorry to report I jumped waaaayyyyy ahead of myself.
    It is a 200 ton RTAC.
    Had to pull the building down, damn triple duties, and pull the strainers. Yup 3/4 plugged. Measured a 10 # differential after they were cleaned and a 5 # across the barrel. All is well. Lesson learned - PM is very important.
    Thanks ALL.

  3. #16
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,091

    Confused

    Quote Originally Posted by durussel78 View Post
    Hey all
    have a trane RTA Chiller - twin screw. CKT 1 is tripping on low evap temp.
    CKT 2 runs all day but is only pumping out 50 deg water - by the time it is reaching the secondary it is 58 deg. Could this be a plugged strainer on the primary if so why is the secondary so warm and why is this thing running if it is plugged. thanks guys

    if ckt 2 runs all day, but ckt1 trips on low evap why and how is this?
    is this because ckt 2 is at 100% and ckt 1 energized to meet setpoint..
    a plugged evap water flow strainer will cause this.,? why would it not trip both ckt 1 & 2?
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  4. #17
    Join Date
    Aug 2004
    Location
    DFW
    Posts
    147
    Because he is loosing the building load. He stated 50 degree water. Which means even with low flow he is above trip points. When all circuits are running and pulling the temp down to setpoint or lower the compressor/s cannot unload quick enough. It may depend on which compressor is started first. I have seen low evap alarms and low ref temp alarms due to water flow. It all depends on the rla of the compressors at the time of low water flow. Such as primary variable water systems.

  5. #18
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,348
    Quote Originally Posted by mlkwal1 View Post
    if ckt 2 runs all day, but ckt1 trips on low evap why and how is this?
    is this because ckt 2 is at 100% and ckt 1 energized to meet setpoint..
    a plugged evap water flow strainer will cause this.,? why would it not trip both ckt 1 & 2?
    he never did give us any performance numbers to work with. it is possible that circuit #2 has other issues or is riding the edge of tripping but it just isn't tripping...yet. small differences can make big differences...if you get my meaning.
    "Mother" is the name for God on the lips and hearts of children....The Crow

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