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Thread: Turning off Heater during Water change

  1. #1
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    Turning off Heater during Water change

    This is my first week of using Apex so please bare with me.

    I have my water change set on FeedD. I’m turning off everything in my sump including my heaters. Sw3bot is my fail safe float if the water levels get low in my sump.

    (Heater1 and Heater2 Code)

    Fallback OFF
    If Tmp < 78 Then ON
    If Tmp > 78.5 Then OFF
    If Sw3Bot CLOSED Then OFF
    If FeedD 030 Then OFF

    1st question, if I start FeedD and the temp is below 78 will my Heater still come on? When does Apex stop reading the code if there are more than one value that is True?

    2nd Question. Is having a .5 F range ok or should I widen the on and off range between temperatures? Ie: 78 to 79

    Thanks


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  2. #2
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    I also is a .5 degree difference, so that should be fine.

    apex evaluates the entire code continuously. The order of the code is important as the last true statement wins. In your example feedD will always result in the unit being off. However if the if temp < 78 then on were last it would be on even of feedD is active.

  3. #3
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    Quote Originally Posted by Frogfish View Post
    I also is a .5 degree difference, so that should be fine.

    apex evaluates the entire code continuously. The order of the code is important as the last true statement wins. In your example feedD will always result in the unit being off. However if the if temp < 78 then on were last it would be on even of feedD is active.
    Thank you for the help


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  4. #4
    Frequent Visitor Todd's Avatar
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    Quote Originally Posted by Iansu View Post

    When does Apex stop reading the code if there are more than one value that is True?
    The Apex reads all commands top to bottom. Any FALSE conditions are ignored. The last TRUE condition prevails. So, in your current code, while FeedD plus additional 30 minutes is ON(TRUE), the outlet will remain OFF regardless of any previous conditions. The general approach to programming is to define the default/nominal behavior and then add exceptions/overrides.

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