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  1. #1
    Join Date
    Dec 2011
    Location
    TN
    Posts
    40

    Confused Oversized/humidity problems

    Hello everyone. I have a 15 ton J15PC heatpump in an Commerical building. This was a designed and engineered building. I believe the unit is oversized but getting someone to admit that is not going to happen. Only runs for a couple of min and is satisfied. Humidity is verrrry high. Do yall have an suggestion on how to control the humidity without over cooling. I am up for any thing we are talking about dumping a lot of air in the ceiling to put a load on the system...

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,339
    What is the temp/%RH? Coil temp during cooling?

    regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #3
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,619
    Is building occupied or vacant

  4. #4
    Join Date
    Dec 2011
    Location
    TN
    Posts
    40
    Yes it is vacant it is jail pod 72 temp with about 64% humidy and higher

  5. #5
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
    Posts
    958
    If its vacant than that's part of the issue. If you try to remedy the issue while it's vacant you'll be scrambling to reverse it when it's occupied. Might be able to adjust the pulleys for lower air flow.
    Quote Originally Posted by k-fridge View Post
    The laws of physics know no brand names.

  6. #6
    Join Date
    Dec 2011
    Location
    TN
    Posts
    40
    I am sorry it occupied I don't know why I said it was vacant

  7. #7
    Join Date
    Jan 2011
    Location
    Central, PA
    Posts
    105
    i am assuming the unit is staged. what is the tonnage of each stage?

  8. #8
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Quote Originally Posted by jabeu View Post
    i am assuming the unit is staged. what is the tonnage of each stage?
    That was my thought. A unit that size should have 2 compressors with 2 refrigerant circuits.

    The only other thought is doing something unusual like install a smaller unit, maybe 5 tons in parallel with backflow dampers of course as a first stage.

  9. #9
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,551
    TACKERDOWN

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  10. #10
    Join Date
    Jul 2012
    Posts
    1,121
    turn the thermostat

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, questions, or commentary in other peoples threads here. Please apply to the AOPC today, thank you.

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    Last edited by beenthere; 07-25-2012 at 07:28 PM. Reason: Message

  11. #11
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    There are single stage 15 ton units.

    I cant imagine its good for that semi hermetic compressor either.

    You're going to have to provide some form of reheat with humidistats to control humidity.

  12. #12
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,339
    Quote Originally Posted by Six View Post
    There are single stage 15 ton units.

    I cant imagine its good for that semi hermetic compressor either.

    You're going to have to provide some form of reheat with humidistats to control humidity.
    Do your reheat with a couple of 200 lbs. per day dehumidifiers like the Ultra-Aire XL200 H. They remove 8 lbs. hour per unit and provide 12,000 btus per reheat per unit. With a good setup on the a/c, expect to to be able to remove upto 80lbs. of moisture per hour with dehus and a/c operating. The 24,000 btus of reheat uses 2 Kw of electricity.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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