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  1. #1

    Do economisers work well in churches? need opinions

    Do econos work well in church setting because of the larrge heat load at once? The system I am working on consists of 2 large air handlers 2 condensers. The system has economiser installed but all the controls are unhooked. Honeywell econo enthalpy sensor 2 to 10 actuator and Honeywell logic. Just curious if it will be benificial to try and get up and running or leave as is. Also church is in the country very dusty conditions orchards dirt. Any info or insight is appreciated.

  2. #2
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    I dont see why not....there there to provide a great option to mechanical cooling. If ambient temps are good for cooling, why not use them. Just make sure they are set up properly.

    Not sure why the economizer option was even chosen and paid for if their not being used.

    Would save them on electric bills too.
    "The road to Hell is paved with progressive policies."

  3. #3
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    If there is cool dry air available, then hook it all up and test it.

    My gut tells me that the last guy didn't understand the econs, and that's why they are disabled.
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  4. #4
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    many guys don't understand the importance of economizers & their function. then there are some who don't care & just bypass it

  5. #5
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    That's the big question with economizers, do the save more then they cost to maintain? Look up the economizer hours for your area and see how that fits their irregular/inconsistent occupied hours.

    Make the recommendation and let them decide if they want broken down systems.

  6. #6
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    Don't think of it as a church; think of it in load and what kind of load and the variableness of the load. Is it jut Wednesday and Sunday or is it used for other functions and when and how long/how many. The system doesn't know it's a church, and depending on your local weather the economizer can be a great energy saver. As to why the economizer was installed look at it from the architect or engineer's point of view IE. it makes you look smart and costs more money and you are charging a percentage of cost as your fee.

  7. #7
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    Just be careful of your changeover setting. Also consider a mixed air thermostat to stage on the cooling if the outside ambient can't keep up with the load.

  8. #8
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    Quote Originally Posted by Failure2Comply View Post
    Just be careful of your changeover setting. Also consider a mixed air thermostat to stage on the cooling if the outside ambient can't keep up with the load.
    Shouldn't there all ready be one in the blower section?
    "The road to Hell is paved with progressive policies."

  9. #9
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    Quote Originally Posted by btuhack View Post
    That's the big question with economizers, do the save more then they cost to maintain? Look up the economizer hours for your area and see how that fits their irregular/inconsistent occupied hours.

    Make the recommendation and let them decide if they want broken down systems.
    It is always cheaper to run a fan than it is to run a fan and a compressor or two, plus a couple of condenser fans.

    Maintenance cost on an economizer is negligible. If the logic module fails, its cost is less than a tenth of the compressor when it fails.

    It's not even a competition.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  10. #10
    The only thing I'm worried about getting it running is when its cool enough to economise and the load all comes in at once the second stage will call which I believe is first stage when in econo mode is running and 2nd stage comp will be off when in a church that could or would likely happen . I will try and get model numbers of econo parts.

  11. #11
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    Quote Originally Posted by pillclinton209 View Post
    The only thing I'm worried about getting it running is when its cool enough to economise and the load all comes in at once the second stage will call which I believe is first stage when in econo mode is running and 2nd stage comp will be off when in a church that could or would likely happen . I will try and get model numbers of econo parts.
    I don't think there is a reason for concern for the sequence of operation, because if you are using a typical Honeywell logic module, you can adjust the enthalpy setpoint based on four plotted curves, A, B, C, or D.

    Nothing wrong with that.
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  12. #12
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    Can you provide:

    The brand, model and serial number for both units

    The logic module (honeywell) number such as W7459, W7212

    the actuator motor number used in the units

    the stats used to control the units

    Thx
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  13. #13
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    Quote Originally Posted by timebuilder View Post

    It's not even a competition.
    I was thinking more about how many economizer hours ( no mech'l cooling) would have occur during the church schedule to offset a $400.00 repair.

    Comparing compressor repairs to Econ repairs IS a no brainier but a different kettle of fish when the OSA is above 75.... One matters while the other is meaningless.

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