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Thread: HI_RISE ac compressors on roof 100 apts

  1. #11
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    Jan 2011
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    United States
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    Quote Originally Posted by kwired View Post
    Ok, I didn't look close enough. Still need to have something to the exterior to get rid of heat during cooling mode or to take in heat if they have reversing valve to use as a heat pump.


    Yup, a wall sleeve which just shows up as a grated vent on the exterior.


    http://www.magic-pak.com/products/m-...ll-sleeves.asp

    http://www.flexenergy.ca/pdf/m-series-architect.pdf


    Around here the units are placed in either a mechanical closet or laundry room which faces an exterior wall or a small dedicated space with door access on the balcony. I know this is not what the OP has, but honestly I am at a loss as to why they would do it like that when other more cost effective options exist.


    Sleeve grates:




    Dedicated balcony MER closet. This is often reserved for luxury units because its quieter and frees up space inside.


    Last edited by mbrooke; 10-10-18 at 12:47 AM.
    I'm in over my head...

  2. #12
    Join Date
    Jul 2013
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    fort lauderdale, florida
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    Quote Originally Posted by kwired View Post
    Your link shows the inside air handling units, OP has 100 outdoor units being placed on same roof, which only has 10 units per floor, you would think they will be a little crowded up there.

    I can't imagine what this will cost, that is a lot of tubing and refrigerant to get from roof to units on the bottom level. Not even sure if compressor is rated to pump through such long circuit without derating and/or increasing line sizes to compensate for losses - which makes even more refrigerant necessary.

    Owner probably thinking they are saving $$ and wanting a circuit from each tenant space to their respective cooling unit so they don't pay the energy bill. Though they are putting a small fortune in the initial investment, and depending on how tenant/leasing agreements work out, maybe still going to have a lot of maintenance cost down the road compared to a system more suited for the application.

    Yes they are trying to save money but like you said future is that they will have lots of issues with distance, I will say longest pull for ac contractor and electrical will be 100ft.

  3. #13
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    Jul 2013
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    fort lauderdale, florida
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    Quote Originally Posted by mbrooke View Post
    They also contain a compressor and coil- all in one. Thats how they do it around here in high rise when there isn't a central chiller or boiler room.

    Where do they install condensing units on roof?

  4. #14
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    Jul 2005
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    856
    That's a crazy design...by crazy, I mean bad

  5. #15
    Join Date
    Dec 2007
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    NE Nebraska
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    Quote Originally Posted by tico17 View Post
    Where do they install condensing units on roof?
    The unit mbrooke brought up doesn't have an outdoor condensing unit, it has louver in the exterior wall for heat exchange with outside air.
    I live for today, I'm just a day behind.

  6. #16
    Join Date
    Jun 2007
    Location
    Fredericksburg, VA 21 Hours from Winged Horses with traffic
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    Right, no units on roof with design shown by mbrooke.

    This all-in-one unit, like in the pictures, is all I see on new apartment/condos in northern Virginia. Everything wired per unit or condo, no refrigerant lines running to roof. Easy-peasy.

  7. #17
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    Quote Originally Posted by tico17 View Post
    Where do they install condensing units on roof?
    They don't, its all in one unit. The external lovers exhaust the hot air.
    I'm in over my head...

  8. #18
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    Feb 2003
    Location
    Huntsville Alabama
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    Water source heat pumps would have been the way to go.

    Sent from my LGL157BL using Tapatalk
    Some people are like slinkies. They serve absolutely no useful purpose. But still put a smile on your face when pushed down a flight of stairs.

  9. #19
    Join Date
    Feb 2008
    Location
    Texas
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    930
    Quote Originally Posted by tico17 View Post
    Hi everyone,

    question i have to run power and low voltage for 100 apts on a new building 10 stories, i was going to run a 1/2 for L.v. and 3/4 emt from each apt to roof but i will end up having 200 conduits on roof for this compressors, any ideas on how to get power from each apt. to roof.
    I've seen a single large (maybe 6") penetration between 4 units. Both the low voltage and the line voltage stubbed through then sealed off. You go from 200 individual penetrations to 25. Try and get the AC contractor to orient the unit tie in corner to the stub.

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  10. #20
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    Jun 2003
    Location
    Hawthorne, New York NEC: 2014
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    Quote Originally Posted by tico17 View Post
    ... I will say longest pull for ac contractor and electrical will be 100ft.
    I find that hard to believe. Building is 10 stories, that's nearly 100 feet right there. What are they going to do, drop the lines straight down through the apartments to the floors below?

    -Hal

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