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  1. #14
    Join Date
    Feb 2012
    Posts
    11
    sorry but i don't follow please tell me more i'm willing to learn if your willing to teach

  2. #15
    Join Date
    Mar 2005
    Location
    Indiana
    Posts
    160
    That diagnostic is usually caused by no flow through the barrel. Throttle the leaving water butterfly valve, if so equiped to see if you hear water flow. If it doesn't get really turbulant sounding, you don't have flow. Put gauges on to check for pressure drop to see if you have flow.

  3. #16
    Join Date
    Feb 2012
    Posts
    11
    thanks will do

  4. #17
    Join Date
    Jan 2012
    Location
    Perth Down Under
    Posts
    26
    A lot of Trane screw machines have a built in freeze protection where if the entering water temperature of the evaporator is cooler than the leaving and the chiller is enabled it will fail.
    In my country, if this occurs it is because the chiller, controls the pumps and the enable signal is given to the chiller. When the pumps are started the protection is enabled and if there is a cool pocket of evaporator water in the circuit and the reversed temperatures occur the unit faults. To prevent this from occurring, start the chilled water pump at least 5 minutes before the chiller is enabled. Circulating the water evens out the temperatures in the circuit and since the chiller is not enabled, the protection is not active and the fault will not occur.

  5. #18
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57

    Smile

    Take time to think through the problem at hand, don't rush.
    Similar issue just the other day. Except w/a hi ent water temp
    Fault. Techn. Is new to chiller work, chiller started w/a hot loop.
    Piping not well insul. Sun baked, water at 88.7' intake, so it shut
    Off. So I told him call BAS to open valve and try in 20m.
    Stable at 64',go ahead &start chiller & log readings. This was
    After him starting & resetting sev. Times. Explained to him what
    Occurred and advised for him to repeat where necessary.

  6. #19
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57
    Completely Agree with gear drive guru. Same principle :
    Differing applications.

  7. #20
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,111
    Quote Originally Posted by Tassajara View Post
    This might seem like a crazy question are you sure those sensors are not reversed?

    Sent from my SPH-D710 using Tapatalk


    ent and leave water sensors reversed?
    they are the same sensors, dont think this would be a problem


    Quote Originally Posted by zw17 View Post
    I just was thinking about it and if you switched around the EEWT and ELWT sensors in the right way and under the right conditions (which I believe you are) you run a very real risk of freezing the barrel.

    Stop what you are doing, put things back the way they were, and call for some help.
    i was taught if someone ever replaces a sensor that it is best to run the wire all the way back to the board,
    i am under the understanding if one cuts a sensor that it changes the resistance,
    now, i ran across something the other day.,.,

    was working on a RTAA1404 , going off on water temp, i changed the temp sensors in the ent and leave wells in the water lines at the machine., theses sensors tied in to the 695, come to find out i replaced the wrong one., i was supposed to change the water temp sensors on the barrol,.
    question, why sensors on the cooler barrol,.(because factory mount safetys i would think) and external water temp sensors, in the water lines, more safetys?
    Last edited by milkyway; 04-19-2012 at 08:04 AM.
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  8. #21
    Join Date
    Mar 2007
    Posts
    3,138
    If it's an RTAC, the entering water temp sensor can be bound as the leaving water temp sensor and vice versa. If it's an RTAA, it's easy to switch them up at the plug on the chiller module.

    I had an after hours call recently where the customer had pulled all of the wires out of the MTA plugs to clean the connections. When he put them all back, he got the saturated evap temp. sensor and suction temp. sensor for one of the circuits mixed up. The circuit would pump itself down into a vacuum. Being an RTAA170, it did not have a low pressure switch. I think it would eventually fail on high pressure or low superheat, can't remember which... Probably lucky the compressor didn't lock up.
    The key to happiness is lower expectations.

  9. #22
    Join Date
    Jul 2001
    Location
    maryland
    Posts
    1,355
    I am the best chiller mechanic that has ever graced this board with his presence and many if not all of the top chiller mechanics here crave my advice even though I rarely hand it out willy nilly.

    that being said I will offer you a bit of advice for this chiller, please take heed....

    sell the customer a new chiller, double the size and this will remedy all of you issues, i promise. The rest of you can continue with your day, thank you.
    Saving the world...one service call at a time.

  10. #23
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    957
    Quote Originally Posted by mallron View Post
    I am the best chiller mechanic that has ever graced this board with his presence and many if not all of the top chiller mechanics here crave my advice even though I rarely hand it out willy nilly.

    that being said I will offer you a bit of advice for this chiller, please take heed....

    sell the customer a new chiller, double the size and this will remedy all of you issues, i promise. The rest of you can continue with your day, thank you.
    Word!
    If your work speaks for itself, don't interrupt. ~Henry J. Kaiser

  11. #24
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,524
    Quote Originally Posted by mallron View Post
    I am the best chiller mechanic that has ever graced this board with his presence and many if not all of the top chiller mechanics here crave my advice even though I rarely hand it out willy nilly.

    that being said I will offer you a bit of advice for this chiller, please take heed....

    sell the customer a new chiller, double the size and this will remedy all of you issues, i promise. The rest of you can continue with your day, thank you.
    amen chiller pope!
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  12. #25
    Join Date
    Apr 2012
    Location
    Texas
    Posts
    196
    nm

  13. #26
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,111
    If it's an RTAC, the entering water temp sensor can be bound as the leaving water temp sensor and vice versa. If it's an RTAA, it's easy to switch them up at the plug on the chiller module


    Ah ,.!
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

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