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Thread: Trane RTCA 500

  1. #14
    Join Date
    Mar 2004
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    ottawa canada
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    2,065
    Yep sorry I stand corrected . early start things gettin foggy
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  2. #15
    Join Date
    Mar 2004
    Location
    ottawa canada
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    2,065
    double post . I need to hit the hay
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  3. #16
    Join Date
    May 2000
    Location
    Houston, TX, USA
    Posts
    343
    I also have not seen a phase monitor to control fans. The unit comes with phase loss, phase reversal, power loss and current unbalace protection from the chiller module through cts. So I don't know reasoning to add a separate monitor for the fans. The only issue I have seen with both the RTAA and RTAC on the fans is when you loose a fan and it blows a fuse it shuts down multiple fans causing the unit to go down on high head or low oil flow. Also another issue was the wires rubbing where zip tied at fan brackets causing a nick in the wire and grounding it out blowing a fuse.

  4. #17
    Join Date
    May 2000
    Location
    Houston, TX, USA
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    343
    Just FYI don't just look at the outside coils check under the chiller at the inner coils since I have noticed most of the trash usually ends up at the inside and not the outside. But I agree that your high oil temp is probably due to your high head pressures. What is your split on the coils?

  5. #18
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
    Posts
    214
    Hey Caddy, that rubbing wire trick is a good one, cost us a VFD for one fan and a motor as well. tricky little thing to catch if the tie is broken and the wire gets drawn up while the fan runs............got lucky with checking early day time before sun got up too high the spark kind of gave the secret away !!!

    Ok, on no cooler on these units, will see what happend for air trouble.

    The phase minitors are set up for these machines, call them aftermarket extras. the feed is broken down into two sets of fuzed feeds, so the thought is if ya loose a few fans they don't all go down and ya can still have a little cooling.......... In any case the phase relay is tied to the building monitoring system, allowing a back alarm to show, if ya knwo were to look for it !!!

    So for me, its just an extra "THING" to deal with...........

  6. #19
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
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    214
    OK, need to rattle the rust out of the old head, exsplain coil split ???

  7. #20
    Join Date
    Jul 2007
    Location
    The Hot South
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    1,317
    Delta T across the coil.

  8. #21
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
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    214
    do you think I'm soem kind of sping chicken to climb up inside and take temp readings........or Wilt Chamberlin reaching over the top fan disharge !!!
    I can tall ya from my cyber finger, the air is Hotter comin out then goin in !!!!

    Picky Picky Picky !!!!

    And its not Delta T, here in Atlanta its AIR TRAN T !!!! LOL..........

  9. #22
    Join Date
    May 2000
    Location
    Houston, TX, USA
    Posts
    343
    Yep, to fix issue where wires rubbed and caused blown fuses, I cut the ties and placed some insulation tape and then retied the wires back. By the way I did that on all fans on the chillers which I had one fan go down due to this that way I prevented any future failures on the other fans. And the split is air in condenser and air out.

  10. #23
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
    Posts
    214
    send me soem duct tape !!!

  11. #24
    Join Date
    May 2000
    Location
    Houston, TX, USA
    Posts
    343
    [QUOTE=Mongo and me;10527852]do you think I'm soem kind of sping chicken to climb up inside and take temp readings........or Wilt Chamberlin reaching over the top fan disharge !!!
    I can tall ya from my cyber finger, the air is Hotter comin out then goin in !!!!

    I don't climb in to check air in. You can check air in on the outside coils and for air out either a ladder or if chiller is at ground level, my thermometer that came with my fluke I can reach and get air from fan discharge.

  12. #25
    Join Date
    May 2000
    Location
    Houston, TX, USA
    Posts
    343
    As for hot and humid, I am in Houston so its very hot and humid most of the year down here.

  13. #26
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,390
    oil temperature issue: as the head pressure goes up due to dirty coils (assume constant evaporator load) the refrigerant flow rate drops. when it drops, each molecule of refrigerant has to absorb more heat than it normally would. the higher discharge temperature heats up the oil that is also passing through the compressor. since there isn't an oil cooler, you trip on high oil temperature diagnostics before you trip on high head pressure diagnostics...just one of those weird little things that the engineers probably didn't mean to have in there...but there it is.

    keep the condensers clean...it sucks to keep them clean...but it sucks to have a chiller down too.

    please be careful using the idea of 'condenser split'. using a PERFECTLY CLEAN condenser coil and ALL of the fans running, you can use condenser split as a diagnostic/performance tool...but why? the condenser is perfectly clean!

    because some of the fans may not be running, the condenser split may appear unusually high. also, because your condenser fans get different run times, the condenser can get dirtier under some fans than others...so which leaving air temperature would you use? the hottest one? the coldest one?

    condenser split is a great tool for residential and very small commercial systems with 1 or MAYBE 2 fans. not for a chiller with 20+ condenser fans.


    as for the condenser fan wiring...get a bunch of wire ties and cut out all of the old factory-installed wire ties. install the new wire ties properly with snug (not death grip) wire tie tension and save yourself the headaches. after you get a few fans done, it can go pretty quick...you will probably be doing it later anyway.
    When I am late for work, I usually make up for it by leaving early.

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