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  1. #14
    Join Date
    Feb 2011
    Location
    Fogelsville, Pa.
    Posts
    114
    Quote Originally Posted by aNtHoNyNoZ View Post
    Being that its a hospital arent you required to have fresh air? Are these units the means for that fresh air?
    This is a smaller out building not the main hosp. Not a steril environment. No surgeries or anything in this bldg. there are other separate units for fresh air.

  2. #15
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    925
    Quote Originally Posted by billymons View Post
    This is a smaller out building not the main hosp. Not a steril environment. No surgeries or anything in this bldg. there are other separate units for fresh air.
    again if you want to dig into this further get the installation material, mechanical drawings, (if any) and warranty stuff and read through it. but what you will find at the end, they got what they paid for.

  3. #16
    Join Date
    Jun 2004
    Location
    tyler texas
    Posts
    27
    rack works best.they have a special type unit for fresh air. we lined all of our r/a ducts before install, if they dont have enough return they scream

  4. #17
    Join Date
    May 2004
    Location
    SE Pennsylvania
    Posts
    830
    If anything the plenum should have been lined with opening on top with a filter rack there to baffle some of the noise. That looks ugly, hard to access filter but I don't think it will affect operation at all. Hopefully that's not how the engineer drew the details then I would hate to see the rest.

  5. #18
    Join Date
    Jun 2010
    Location
    Philadelphia PA
    Posts
    2,159

    It's not pretty BUT

    It does give you a filter rack with a larger filter (given the angle) and it will reflect some of the insertion noise from the unit ( vs if the filter was right on the end of the unit.
    This will not win any sheet metal craftsmenship awards but no technical rules broken as far as I see
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  6. #19
    Join Date
    Feb 2012
    Location
    Tyler, Tx
    Posts
    11
    Daikins are odd sizes to get filters for. The usual setups we are used to don't work. The company I work for has been installing these for a few years. Many growing pains involved. Filter bases and sizes included. I think the systems are great tho. Adapt or disappear.

  7. #20
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57
    Since this is a hospital, CYA, once you sign off, could leave you open for a lawsuit. Daikin vrv's r decent equipment, but that would suggest to me that their is adesign problem. Simple as the wrong type box, mounted in that location. Do yourself a favor and ring it up to your boss.

  8. #21
    Join Date
    Feb 2004
    Location
    New Mexico
    Posts
    5,355
    I can't tell by the pics but is that a ducted return. If so the holes make the sub ceiling a plenum. Depending on size of the sub ceiling there might be a fire code problem.
    Reasons for poking holes in returns..Not enough RA. Access to filter, coil, drain pan.
    By the work it looked like someone was in a hurry and wanted a quick fix.
    Tracers work both ways.

  9. #22
    Join Date
    Jun 2012
    Location
    Northeast
    Posts
    210
    From the pics it looks to me that the sealed duct coming into the left side of the return air plenum is you make up air. I believe Diakin requires it to be already conditionded by another unit. It also looks like it is a plenum ceiling return system like some other guys mentioned. Make sure you have return grills in the drop ceiling. And as already mentioned if it is plenum return everything in the drop ceiling has to be rated for it to be code. I know those little AHUs do not produce much static also and duct work can be an issue. As for the filter replacement the service guy is never thought of. It would would cost more money to install to make it properly servicable.

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