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Thread: How to program my fans to run first then chiller

  1. #1
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    How to program my fans to run first then chiller

    Hello everyone,

    I have both fans and a chiller connected to my Apex to cool down my reef tank. Right now both are running simultaneously with chiller programmed to start at a bit higher temperature set point so that fans would run first.

    This usually is okay I guess but when it gets really humid fans would run forever making it even more humid but the temperature wouldn't drop. So what I had in my mind was to keep track of how long the fans have been on and start the chiller once it's been on for a certain time. Is this possible?

    This is something I had in my mind.

    If fans been on for more than 5 mins Then Chiller ON

    Is there a way to keep track of how long a certain outlet has been on?

  2. #2
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    You can add a defer statement to your chiller code.

    Say your Chiller and Fan are set to turn on at 79.00 Degrees. You can set them to both turn on at that temperature to cool the tank but delay the chiller by a number of minutes. That way if the fans run and cool the tank below the set temperature before the defer time, the chiller would never have come on. However, if the defer time passes and the fan hasn't cooled it enough the chiller would then come on and cool the tank. Once they both reach the desired temperature they both would turn off.

    Just add the defer statement to the bottom of your chiller code, change the time as needed.
    Defer 005:00 Then ON

    This will make sure this amount of time has passed before it turns the chiller on.

  3. #3
    Frequent Visitor Todd's Avatar
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    Further, you can add a statement to turn OFF the fans if the chiller is ON.

    If Output FANS = ON Then OFF

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    Quote Originally Posted by Todd View Post
    Further, you can add a statement to turn OFF the fans if the chiller is ON.

    If Output FANS = ON Then OFF

    I think you mean...

    If Output Chiller = ON then OFF

    The fan statement doesn't do anything.


    Sent from my SM-G955U using Tapatalk

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    Thanks for the tip! Adding a defer statement sounds like a great idea.

    One more thing. Is there a way to force the chiller on by another "IF" condition even if the time set by the defer statement has not elapsed? I'm going to set both fans and chiller to turn on at the same temperature and delay chiller with defer statement as you've suggested. But if I wanted the chiller to immediately turn on if the temperature rises too quickly before the timer value, can this be realized with Apex?

  6. #6
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    This could be accomplished with the use of virtual outlets. You can create two virtual outlets and name them what you like.


    VO1: RunChiller1
    Set Off
    If Temp > 79.0 Then ON
    Defer 005:00 Then ON

    VO2: RunChiller2
    Set Off
    If Temp > 79.5 Then ON


    Chiller Outlet: add these Four lines
    Set OFF
    Fallback OFF
    If Output RunChiller1 = On Then ON
    If Output RunChiller2 = On Then ON


    This way when either or both the outlets are on it will turn the chiller on. RunChiller1 will turn the chiller on after 5 minutes of the temp being above 79 degrees. RunChiller2 would turn the chiller on instantly after the temp reaches 79.5.

    You would not need a temperature statement or a defer statement in your chiller code as the virtual outlets are telling the chiller when it is needed.

  7. #7
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    Thank you once again.

    One more thing. Can you create virtual outlets through APEX Fusion? I've scrutinized every single menu in APEX Fusion but couldn't find where you can create one. Do you need to create one using the display module? I'm using the older version of APEX, not the latest 2016 version.

  8. #8
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by repdslee View Post
    Thank you once again.

    One more thing. Can you create virtual outlets through APEX Fusion? I've scrutinized every single menu in APEX Fusion but couldn't find where you can create one. Do you need to create one using the display module? I'm using the older version of APEX, not the latest 2016 version.
    Only the 2016 version can. You have to do it from the classic dashboard for your apex.

    Sent from my SM-G965U using Tapatalk

  9. #9
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    Thank you so much for the info!

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