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  1. #1
    Join Date
    Dec 2001
    Location
    Chicago, N/W burbs
    Posts
    8,004

    Look what I found on mainteance

    Doing PM work on 8 Liebert dry coolers.
    Found one balloon shaft with a cracked shaft.




    So, I sat there for a while waiting for the light to come on over my head......


    New shaft and frequency drives for all 8 dry coolers. These things bang on/off at least 100 times a day. Electronics will save us all!
    R2B4BTU

  2. #2
    Join Date
    Dec 2001
    Location
    Chicago, N/W burbs
    Posts
    8,004
    Replaced the shaft today. It was fun, working aloft with fall restraints on.


    Here's a better look at the shaft after we got it out.
    R2B4BTU

  3. #3
    Join Date
    Aug 2006
    Location
    Panama City, FL
    Posts
    741
    Why do you get all the easy ones, Otto.
    People agree to the strangest locations for HVAC equipment. That one defies logic. Where was that?
    You can't learn a thing with your mouth open.

  4. #4
    Join Date
    Oct 2004
    Location
    OZ Aka SW Florida
    Posts
    1,830
    Whats up with that A/H, I haven't seen one that clean since start up??
    Refrigeration...Finding the Wright Wrench to pound in the correct..Screw

  5. #5
    Join Date
    Jul 2001
    Location
    VA
    Posts
    2,801
    Otto has a crack in his shaft...

    hate when that happens.
    ___________________________________________


  6. #6
    Join Date
    Jun 2005
    Location
    DuPage County, IL
    Posts
    151
    Fall protection can be a "pain in the balls"...
    Figman

  7. #7
    Join Date
    Dec 2001
    Location
    Chicago, N/W burbs
    Posts
    8,004
    Hey, Figman! long time no see. How ya been?

    This air handler is actually a dry cooler for glycol. It's 13 floors up but, still gets quite dirty. They use 2" pleated filters on the intake and they're replace quarterly.

    The 10 HP motor bangs on/off quite often, especially during the winter months. We would like to get freq drives on all 8 of them but, it doesn't look like that's going to happen. There is also a 3 way valve on every unit so we'll try to get the valve to do more of the work and get a wider spread on the motor temperature range.
    R2B4BTU

  8. #8
    Join Date
    Jun 2005
    Location
    DuPage County, IL
    Posts
    151
    doin' good otto, thanks. working on getting my post count up alittle. always enjoy your pic posts. keep em coming. hope you're getting some time off for the holidays...
    Figman

  9. #9
    Join Date
    Dec 2001
    Location
    Chicago, N/W burbs
    Posts
    8,004
    I was supposed to go back to that job today (Saturday). The 10 Liebert A/C units are in the data center and we can only go in there for emergencies or on weekends. I have some sheaves (or are they pulleys???) to replace. They keep the belts way too tight on the units. I tried to show them the way with my tension gauge and chart. Oh well, job security!

    I still get over your way. I'll have to stop in for a cup of rocket fuel some time.
    R2B4BTU

  10. #10
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,064
    Quote Originally Posted by otto View Post
    sheaves (or are they pulleys???) . .
    i call it a pulley , but i guess it depends on who you ask.

  11. #11
    Join Date
    Jun 2005
    Location
    DuPage County, IL
    Posts
    151
    sheave, pulley, tomato, potato...let's not start this again
    Figman

  12. #12
    Join Date
    Dec 2001
    Location
    Chicago, N/W burbs
    Posts
    8,004
    LOL G8'er.

    Der Unterschied ist immer interessant zu erwägen.

    Have a happy Memorial Day.
    R2B4BTU

  13. #13
    Join Date
    Feb 2006
    Posts
    109

    drycooler

    I saw this thread and it reminded of a job we did a couple of years ago, as I remember it we had a very long run from unit to drycooler and the issue was voltage drop across the distance. The builder did not want to pay sparky to run proper wire in conduit. I think we ended up finding in the manual that you could install a jumper instead of having the crac control the drycooler and it would run the fan cont. and modulate the threeway valve. I know this is more run time on the motor and filters, but you have almost no start/stop stress. I am no expert, but wouldn't this be a cheaper, less complicated answer to the stress crack issue with the shaft vs freq. drives? The system I have refered to seems to work great. Just wondering if I might have missed something that I should keep in mind for the future.

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