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  1. #1
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,462

    Elevator room A/C

    We just completed this job in an elevator room at a big downtown hotel.

    The elevators used to have mechanical controls. They were recently upgraded to electronic controls and the manufacturer wants them kept near 75 degrees at all times.

    Nobody could give us the BTU output of the elevator controls and motors so we sized the systems by the very technical "3 ton is the biggest condenser that will fit through the hallway, anything bigger needs a helicoptor, lets start with two of them method" Apparently this method worked great because we just a very hot weekend and the system kept up fine.

    This was the first job that I did entirely in ridged ACR pipe. Went through a lot of brazing rod and nitrogen. It didn't help that we had to cut all the 20' lengths of pipe down to 10' to get them up there.

    these are the elevator motors 47 Horsepower, 72 RPM, around 300 volts DC
    Name:  motors.jpg
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    The air handlers fit perfectly inline with the elevator controls and even came with a matching paint job.

    Heres air handler #1

    Name:  unit1.jpg
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    As you can see the ductwork is very basic, just a plenum with 3 registers in it. The high velocity coming out the registers makes for surprisingly good air distribution.


    Heres air handler #2
    Name:  Unit2.jpg
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    Heres some piping
    Name:  piping.jpg
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    The condensers
    Name:  condenserfront.jpg
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    And the view from the roof
    Name:  view.jpg
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  2. #2
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,462
    Heres the mechanical controls that were replaced by the electronics. This one is connected to the employee elevator in a different room and is still in service. Most of the contactors and relays are original
    Name:  oldcontrol.jpg
Views: 276
Size:  71.2 KB

  3. #3
    Join Date
    Sep 2008
    Location
    hog town,toronto,canada
    Posts
    61
    Nice looking job
    Elevator a/c's get dirty fast,with all the carbon & oil in the air.
    Its like a/c equipment for machine shops sometimes

  4. #4
    Join Date
    Jun 2007
    Location
    Here. I'm right here i tell you!
    Posts
    465
    they just don't make stuff like that anymore. I don't know if that's a good thing or a bad thing.

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,246
    Great workmanship. Never seen a cheapo Maytag before!

  6. #6
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,462
    Quote Originally Posted by BaldLoonie View Post
    Never seen a cheapo Maytag before!
    Didn't see a reason to go with the stainless steel model on a roof . The "cheapo" line models were just overhauled. They look much better than the old models. They now have the same "swept wing fan" as the premium line, so they're super quiet. They're also very small, just barely bigger than a 10 SEER.

  7. #7
    Join Date
    Jun 2006
    Location
    Torrance, Ca
    Posts
    172
    We've got lots of elevator rooms at work. The majority of them are cooled with hydronic fan coil units. The coils get coated in oil that cuts the capacity. I can't get the coils clean enough to restore full btu output. They are a constant source of complaints from the Elevator Techs. What did you do to prevent the DX coils from fouling? Have you found anything that works to clean the coils?

    Derb

  8. #8
    Join Date
    Mar 2007
    Location
    Madison, Wisconsin
    Posts
    2,260
    LOL I love the load calc logic :P
    I r the king of the world!...or at least I get to stand on the roof and look down on the rest of yall

  9. #9
    Join Date
    Apr 2007
    Location
    Dallas, TX
    Posts
    235
    How do you go about getting into this line of work?

    Im at the residential / Light Commercial Side.

    Just curious... Im in the Dallas Area.

  10. #10
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,462
    Quote Originally Posted by Sammer VII View Post
    How do you go about getting into this line of work?

    Im at the residential / Light Commercial Side.

    We are also resi/light commercial. We got this particular job just because a general contractor we do alot of work for was doing a remodel in another area of the hotel. We actually did this as a subcontract through him.

  11. #11
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,462
    Quote Originally Posted by derb View Post
    . What did you do to prevent the DX coils from fouling? Have you found anything that works to clean the coils?

    Derb
    We actually didn't take this into account. I never thought of the possibility of that being a problem. The elevator room is actually very clean. There doesn't seem to be any oil/grease at all. There is a small amount of black soot looking stuff around that could either be carbon brush dust or pollution from the city (there used to be a fan that drew a couple thousand CFM of air though this room)

  12. #12
    Join Date
    Jul 2008
    Location
    calgary
    Posts
    17
    wow Im impress with the quality of your job and the nice view.

  13. #13
    Join Date
    Jul 2004
    Location
    Poughkeepsie, Ny
    Posts
    632
    Quote Originally Posted by craig1 View Post
    We actually didn't take this into account. I never thought of the possibility of that being a problem. The elevator room is actually very clean. There doesn't seem to be any oil/grease at all. There is a small amount of black soot looking stuff around that could either be carbon brush dust or pollution from the city (there used to be a fan that drew a couple thousand CFM of air though this room)
    We had the same problem. The air handlers keep the air moving, then the coils get dirty even with the pleated / floss filters. What works for us is the aluminum filters do a great job. I guess the particulates like to stick to cold metal. We sacrifice the aluminum filters to save the coils and the work to clean them. They also work great in saltwater fish stores.
    Happiness is the only good. The time to be happy is now. The place to be happy is here. The way to be happy is to make others so.
    -Robert Green Ingersoll

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