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Thread: Recirc Pump to come on using 2 temp probes

  1. #1
    New User
    Join Date
    Apr 2018
    Location
    Santa Clarita, CA
    Posts
    2

    Recirc Pump to come on using 2 temp probes

    Here is my current code... This code turns on a recirculating pump to my water heater.

    Fallback OFF
    If Tmp < 76.8 Then ON
    If Tmp > 77.2 Then OFF
    If Tmpx5 < 76.8 Then ON
    If Tmpx5 > 77.2 Then OFF


    I have 2 sumps for two separate tanks.. both are heated using pex tubing and a shared recirc pump. I have solenoids that open to direct the heat to the corresponding sumps and that works just fine.. problem is that the recirc pump will not turn on if one of the tanks is above 77.2 degrees.. example.. Tmp can read 77.4 and Tmpx5 can be 76.7.. the recirc pump will not turn on until Tmp probe drops below 76.8 as well.. What code would I need to make sure that the recirc pump will turn on if either probe is below 76.8?? Thanks!

  2. #2
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
    Location
    Denver, CO
    Posts
    13,176
    You have to use virtual outlets for more than one temp hysteresis.

    CircHeat1
    If Tmp < 76.8 Then ON
    If Tmp > 77.2 Then OFF

    CircHeat2
    If Tmpx5 < 76.8 Then ON
    If Tmpx5 > 77.2 Then OFF

    Actual outlet
    Fallback OFF
    Set OFF
    If Output CircHeat1 = ON Then ON
    If Output CircHeat2 = ON Then ON






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

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