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Thread: Church AC

  1. #11
    Join Date
    Dec 2008
    Posts
    11

    Yes

    Most of that is valid, and I have no idea why VRF hasn't been brought in. The HVAC co installing it has a VRF system in their home Church that is probably a multitude more expensive. And as for the ducted systems, they just *don't* have room in the ceilings to add it, as they are adamant about keeping the 1800's ceilings in place. On the third floor they will be using a few mini splits with up to 4 supplies on ea ductless. The Sanctuary has 13 of them going in in that lone space, so really it is 15 in the large building, but it *is* attached. And I do have specs on them, the HVAC guy actually sent the 3 model nums so I have some semblance on what to calculate, because, yeah, they need a new service. And what's more, is the roof on this Church are spires. There isn't a flat roof capable of housing any RTU, and the area of the city is tight on all sides. As long as they give me a design that I can base my calcs on I should be able to get them some prelim numbers. I appreciate all the info and ideas, I wire 80-90 ductless a year in this area, but this one is by far the most wtf of them all yet.
    This building is OLD. The good news is the insp in this area is on my advisory board and we get along swimmingly, so at least I have a shot at this one. I will keep this thread posted with progress in case someone stumbles onto WAY too many ductless in the same "building".
    -If you saw the size of this place 28 wouldn't sound that ridiculous, but, when I asked to see their switchgear room, they were like "oh you mean the panel? IT is over here"
    I laughed out loud. Single 400A disconnect to a single 200A panel. 34,500 sq ft.


    "Jax" is in reference to my last name which is Jackson. I am in Massachusetts. Our MEC ammendments aren't too crazy here, but like anything else interpretation is everything.

  2. #12
    Join Date
    Aug 2017
    Location
    Maui
    Posts
    14
    Quote Originally Posted by drcampbell View Post
    Could also be Jackson, Michigan or Jacksonville, New Brunswick. (Canada)

    Regardless of location, if the mechanical engineers have specified HVAC equipment of an appropriate size, it can be expected to run "continuously" on the hottest summer days and coldest winter nights, and the electrical supply should be sized accordingly.
    Agreed. Evaluation of the existing service per 220.87 should be performed and the new connected loads added. From there you could identify the required service size and quote the upgrade or suggest the Mech Eng re-design to work within the existing service constraints. There are no diversities that I know of for commercial HVAC and must be calculated at 100% of nameplate rating, but perhaps others know of one?

    ETA: Is it a single phase system? That limits the splits to 5 tons or less as larger units are nominally 3 phase. Could be a constraint. Hate to suggest mechanical designs, but how about a ducted package unit for the assembly area either concealed under floor or spiral exposed duct?
    Last edited by follybeacher; 09-05-18 at 03:31 PM.

  3. #13
    Join Date
    Mar 2003
    Location
    New England
    Posts
    13,398
    Quote Originally Posted by JaxELectric View Post
    "Jax" is in reference to my last name which is Jackson. I am in Massachusetts.
    I'm sorry to hear that.

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