Explosion-proof evaporator.
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  1. #1
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    Hey guys. I got myself into a weird situation again.

    An industrial customer has a small room in which they store some chemicals. The room is currently cooled by a special Fedders air conditioner that was made as an explosion proof unit.

    Now the customer wants to run the box at 40*F. The load I came up with is 12,600 btuh. The fan motors would have to be explosion-proof.

    I can't find a supplier for any thing like that. I can't even find a maker of the old gravity coils. Humidity is not an issue.

    Anybody have any leads for a walk-in cooler evaporator like this?

    [Edited by benncool on 04-21-2004 at 02:02 PM]

  2. #2
    Join Date
    Jul 2001
    Location
    In the tater patch
    Posts
    39
    You might try http://www.lawquip.com









    [Edited by Idatech on 04-21-2004 at 02:57 PM]

  3. #3
    Join Date
    Jan 2002
    Posts
    255
    Beenie, call Marc Climatic Controls. They are not a manufacturer, but will take an existing evaporator and make it explosion proof.

    713-464-8587 Not sure who to talk to.

  4. #4
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    Thanks guys for the help. This will give me some leads to follow tomorrow.

  5. #5
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215

    Hmm

    Don't know the cost diff, Jerry, but you could always remote the evap outside the EP environment, and duct the air in and out, with boom dampers...

    I would imagine that soem custom coil mfgs would make bunker coils to fit this app, I mean, a ton is nothing.

  6. #6
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    The suppliers that I talked to thus far all say, "they used to make explosion proof evaporators but they no longer do."

    I don't know if this is because of NEC regs or because so much manufacturing has moved out of country that there is no longer a market.

  7. #7
    Join Date
    Oct 2003
    Location
    Valdosta Ga
    Posts
    847
    My guess is they are not worried about the evaporator's explodeing (what about a brine circulating thru a coil with closed motors and controls.)

  8. #8
    Join Date
    Jan 2004
    Location
    Dallas, Ga
    Posts
    33
    Try these guys:
    http://www.criterionhvac.com/
    Or you can try EQUATHERM, we have some EQUATHERM equipment in our EP areas (mostly explosion proof refrigerators, incubators, and lighting) although they may have the equip you're looking for.

    condensedave is right...you may be better off using a remote evap and duct in your air. You'll probably have to go constant volume 100% outdoor air with an exhaust fan for obvious reasons. The air in a chem storage area really shouldn't be recirculated, with a build up of flammable vapors... one little static elec spark and BBOOOOMM! Your ding-ding ends up in your watch pocket. Make sure you consult an engineer familiar with explosion proof areas, just to CYA.

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