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Thread: HI_RISE ac compressors on roof 100 apts

  1. #1
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    Jul 2013
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    fort lauderdale, florida
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    HI_RISE ac compressors on roof 100 apts

    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.

  2. #2
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    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.
    No magic pak?


    http://www.magic-pak.com/landing/v-s...SAAEgK98PD_BwE
    I'm in over my head...

  3. #3
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    Hawthorne, New York NEC: 2014
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    Probably the reason you never see anything like that. Usually the building has a chilled water system for A/C that is included in the common charges. +

    ... Or packaged units.

    -Hal

  4. #4
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    each unit has its own condenser on the roof I find that hard to believe 100 units on the roof would take up quite alot of space

    Sent from my SM-G950U using Tapatalk

  5. #5
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    Quote Originally Posted by nickelec View Post
    each unit has its own condenser on the roof I find that hard to believe 100 units on the roof would take up quite alot of space

    Sent from my SM-G950U using Tapatalk
    Yes, first time seeing this, usually is a cooling tower here in s. Florida, I guess I have no choice to run separate conduits. I was thinking of sharing power for t. Stat and 208v using same type of wire conductors
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  6. #6
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    Can you run one conduit per floor maybe how many app on each floor and how big are the units

    Sent from my SM-G950U using Tapatalk

  7. #7
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    Quote Originally Posted by mbrooke 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.
    I live for today, I'm just a day behind.

  8. #8
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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.
    I agree. This setup is crazy.
    Maintenance will be a nightmare.

  9. #9
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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.


    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.
    I'm in over my head...

  10. #10
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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.
    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.
    I live for today, I'm just a day behind.

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