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  1. #1
    Join Date
    Sep 2018
    Location
    Cleveland ohio
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    Solved a 30 yr problem

    Had a condenser on top of a box that had little air flow, low ceiling, with the leaving side of the coil 2 feet from an out side wall. I told the restaurant owner he needs a wall fan to remove the heat, so he did. It worked off a stat, and did ok. Then i installed a fan cycling switch in parallel with the stat. Now when the head gets high, the wall fan kicks on and discharges the rejected heat outside. Just thought I'd share that, i never seen it done before, and never heard of a control used in that application

  2. #2
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    28,976
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    That's a good fix...... but I've never been a big fan of condensing units inside the space.
    [Avatar photo from a Florida training accident. Everyone walked away.]
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  3. #3
    Join Date
    Jan 2010
    Posts
    13,644
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    If the exhaust fan is already on a thermostat why the need for a additional control ?

  4. #4
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
    13,461
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    Before installing an exhaust fan, consider how much air you're going to need. A good rule of thumb is to provide 1000 CFM per compressor horsepower to hold your space 10F above it ambient whether its a 90F kitchen or 90F outdoor air. Never leave the fan up to the customer either, because they'll always show up with nothing more than a fart fan.

    Also. unless you also provide for makeup air to offset the exhaust, that fan will steal it from the building and it's likely going to be conditioned air. Your not just exhausting heat, you're likely exhausting conditioned air. So you will trade one headache for another without some makeup.

  5. #5
    Join Date
    Jan 2010
    Posts
    13,644
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    Quote Originally Posted by icemeister View Post
    Also. unless you also provide for makeup air to offset the exhaust, that fan will steal it from the building and it's likely going to be conditioned air. Your not just exhausting heat, you're likely exhausting conditioned air. So you will trade one headache for another without some makeup.
    and if its enough exhaust to create a negative pressure in the building and your in a cold environment come winter evertime they open the door in comes the cold air.

  6. #6
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
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    Quote Originally Posted by VTP99 View Post
    and if its enough exhaust to create a negative pressure in the building and your in a cold environment come winter evertime they open the door in comes the cold air.
    That's the other headache. Just remember, any amount you exhaust has to come from somewhere.

  7. #7
    Join Date
    Sep 2018
    Location
    Cleveland ohio
    Posts
    12
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    Thread Starter
    I totally agree with make up air requirements, but figured it would be minimal. In all reality, this place is a mess, they had some hack take these guys to the cleaners. Ill have to post the air handlers to the wall of shame . There hung horizontally above the ceiling 2" from each other, suspended with drive cleat zipped to the panels. Its a miracle they havent fell through the ceiling, i could go on and on. The plan is to replace all that junk, but as for now the cooler is maintaining head , and the box is at set point.

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