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  1. #14
    Sorry but what does rtu stands for? The guy that designed the supermarket he put the return duct near the open freezers. Do you think that could be a problem too?

  2. #15
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Quote Originally Posted by jpsmith1cm View Post
    Air curtains are very common on grocery stores.

    They help keep the conditioned air contained within the building as the doors open and close. They also help with keeping bugs out of the building.
    \
    I understand the bug part & can understand keeping conditioned air in ... its use for keeping unconditioned air out is what was sounding off

  3. #16
    Join Date
    Sep 2007
    Posts
    33
    RTU stands for "roof top unit". In your case it refers to the York 25-ton split system.

  4. #17
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,596
    Reheat without making sure that all of the a/c cooling coils are as cold as possible is spinning your wheels. Cooling coils operating at <40-45^F are the starting point. The dew point of the air inside the store will be 5^F-10^F above the a/c coil temp provided infiltration is under control. Reheat only work with extremely cold coil a/c. For situations where there not free reheat, use high capacity, high efficiency dehumidifiers like the Quest, Ultra-Aire, Hi-E Dry. These unit remove 6-8 lbs. of moisture per KW and provide free reheat.
    Most important first to get the a/c operating with the coldest coil possible. Slow the air flow is a way to get the coil temp needed.
    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"

  5. #18
    The unit has a return dry bulb of 70 f and a supply dry bulb of 58 f.

  6. #19
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,867

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