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  1. #1
    Join Date
    May 2004
    Posts
    175
    Which manufacturer RTUs do you guys recommend for a concentric install for an 18Ton load. This is for a wide open area application. Looking for standard efficiency unit(s) with reliable track record when routine scheduled maintenance is performed.

    Is one unit a good way to go in terms of installation cost, efficiency and maintenance or is two units with one being a backup necessary.

  2. #2
    I have installed rooftops units from Carrier , Trane , Lennox. AAon, York,ect. I feel the Lennox L-series is hard to beat. One unit is more economical to install than two; however if space temperature and down time is critical I would install two rooftop units.

  3. #3
    Join Date
    May 2004
    Location
    Illinois
    Posts
    2,843
    Lennox & York are good, but I don't have as much experience with them as I do with Trane. 90% of my RTU's are Trane, and I rarely have any problems with them.

    Aaon makes a nice unit, too, but they're high-$. Usually those are only used when you need a bunch of outdoor air that a regular rooftop can't handle.

    I'd go with a single for 18 tons, myself. Once you get over about 20-25, the extra duct will be more than the cost of multiple units.

    If you're using concentric drops, it doesn't really matter.
    "If I had my life to live over again, I'd be a KA." - Albert Einstein

    It's later than you think.

  4. #4
    Join Date
    Jul 2005
    Location
    Orange County, NY
    Posts
    936
    There’s no such thing as bad units just contractors that are clueless when it comes to design. Having said that given a choice I would use Trane myself.

    Core

  5. #5
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    473
    Lennox L series would be my first chioce, but York and Carrier also make very good RTU's. I would go with two units, it will cost more to install, but if one goes down or maintenance is being done, you still have one unit in service.

  6. #6
    Join Date
    Feb 2006
    Posts
    203
    L series is one of the best. It's has over 100 configurable points in the board you can use to custmize for the specific application. Splurge and get the interface and software it will make setup easier. We sell alot of L series with factory erv's that bolt on the side.
    refrigeration workers of Ontario

  7. #7
    Join Date
    Jan 2005
    Location
    Area 51
    Posts
    984
    Lennox T series is a good RTU, unlike the L series units it does not contain all the intagrated circuit boards that contain some functions that you may not use like a central energy management system, communication buss and multiple configurable points for control of the heat ,cool and economizer. The T series uses the same compressor as the L series along with the same burner, refigerant flow controls and blower
    http://www.lennoxcommercial.com/prod...p?product_id=3
    "Paddle faster, I hear banjo music"

  8. #8
    Join Date
    Jan 2004
    Location
    Here and there
    Posts
    4,805
    Ruud B series. But I may be a little jaded
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  9. #9
    Join Date
    Mar 2004
    Location
    midwest
    Posts
    958

    Talking

    Pick the best supported manfuacturer in your area. Parts adn service after the sale are my big factor. Unless your the cheap bottom feeder, who under cuts everyone with off brand stuff. York, Lennox both good!
    An astronaut stuck in space was asked by a reporter, "How do you feel?"
    "How would you feel," the astronaut replied, "if you were stuck here, on top of 20,000 parts each one supplied by the lowest bidder?"

    "do it right or do it twice"

  10. #10
    Join Date
    Jan 2004
    Location
    Here and there
    Posts
    4,805
    Doctor is right. I rep Ruud and stock parts and offer support. Means a lot more than one would realize.... until a problem comes up.
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  11. #11
    Join Date
    Dec 2005
    Posts
    1,918
    I guess it must be Lennox L-Series. Since other companies start to copy the design.

  12. #12
    Join Date
    Jan 2004
    Location
    Here and there
    Posts
    4,805
    Just, Aaon started that design long before Lennox. The Ruud B series is far different
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  13. #13
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,296
    Originally posted by hardwired
    Is one unit a good way to go in terms of installation cost, efficiency and maintenance or is two units with one being a backup necessary.
    What did the A/C system designer tell you?
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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