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Thread: Unconventional chiller question

  1. #1
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    Unconventional chiller question

    Hi All,
    New here and to Apex and would like to request some programming advice. I have recently installed the Apex 2016 + EB832.
    FYI, I am not using the Apex with an aquarium, but to control a specialized chill water system (long story).

    My chiller is plugged into the EB832. I would like the chiller to remain powered on all of the time, except for when it has run (e.g. the compressor has run, drawing power at ~250 watts) for more that 7 minutes at a time (for technical reasons). I am using set points within the chiller controls and want it to cycling normally as its control sees fit, with the exception of the Apex shutting it off for 5 minutes after it has run for 7 minutes. I am thinking of using the EB832 outlet power motoring to accomplish this.
    The program code logic (with incorrect syntax) would be something like:
    SET ON
    IF WATTS > 249 For 7 Mins, THEN OFF
    DEFER 5 MINS

    I know this syntax is wrong, but in looking at the manual and forums I've not been able to figure out the right code to do what I want, if it is even possible.

    Any help is appreciated.

    Thanks,
    Jason

  2. #2
    Frequent Contributor zombie's Avatar
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    Set ON
    If Output Chiller Watts > 200 Then OFF
    Defer 007:00 Then OFF
    Defer 005:00 Then ON

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
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    Quote Originally Posted by zombie View Post
    Set ON
    If Output Chiller Watts > 200 Then OFF
    Defer 007:00 Then OFF
    Defer 005:00 Then ON

    You might be an engineer if...You have no life and can prove it mathematically.

    Thank you very much, zombie; I very much appreciate the help! I had a feeling it was something simple like this and you have saved me numerous additional hours of research/testing. You are an asset to this community.


    Best Regards,
    Jason

  4. #4
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    Hi Zombie/All,
    I've been testing out this suggested code and have not been getting the results I wanted. What seems to be happening is the chiller will run for 7 mins, but then turn off/on really quick, in the matter of 1 second. I've been trying different permutations of this code with no luck. Any other ideas?

    Thanks,
    Jason

  5. #5
    Frequent Contributor zombie's Avatar
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    The defers prevent something like that. The shortest cycle that should occur is 12 minutes.

    Sent from my SM-G965U using Tapatalk

  6. #6
    Frequent Visitor drex's Avatar
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    Say Zombie will that code for the apex jr as well im having the same problem

    Sent from my SM-G955U using Tapatalk

  7. #7
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by drex View Post
    Say Zombie will that code for the apex jr as well im having the same problem

    Sent from my SM-G955U using Tapatalk
    No. Watts and Amps probes for outlets is only available on the EB832 energy bar, which requires a 2016 apex.

    Sent from my SM-G965U using Tapatalk

  8. #8
    Frequent Visitor drex's Avatar
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    cool so i would have to to put in temps right

  9. #9
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by drex View Post
    cool so i would have to to put in temps right
    Yes. Either give it hysteresis and no set OFF if you want the apex driving the chiller, or set it ON and put a safety temp line a degree or two low and a min time then OFF statement if you want the apex backing up the chiller controller.

    Sent from my SM-G965U using Tapatalk

  10. #10
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    Quote Originally Posted by zombie View Post
    The defers prevent something like that. The shortest cycle that should occur is 12 minutes.

    Sent from my SM-G965U using Tapatalk
    Thank you for your feedback, it is very much appreciated. I totally agree with you and based on my study, I also cannot see a reason why the logic should not work. Unfortunately for me, for whatever reason, it doesn't.

    I've tried testing it many times now with various changes to no avail.

    When I tried taking out the 'Set On' statement, the chiller would run for 7 mins, then just stay off and not turn back on at all. For some reason the Apex is not seeing the "Defer 005:00 Then ON" command line. Maybe this has something to do with using the >Watts command; just guessing.

    Any other ideas you might have are greatly appreciated.

    Best Regards,
    Jason
    Last edited by iceman0; 07-28-2018 at 22:38. Reason: typo

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