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  1. #1
    Join Date
    Apr 2008
    Location
    Tucson, AZ
    Posts
    137
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    Belimo to controller change output

    I am looking for instructions on how to change the output of a controller.
    I have a Automated Logic controller ZN341v+ connected to a Belimo TR24-SR-T US for a reheat valve on a VAV. On a call for heat the controller energizes the Digital Outputs. I know this because the LED lights change and I can see it on the Webctrl program logic page. The Belimo valve is connected to the Analog Output.
    I want the controller to use the AO instead of the DO for control.
    The other controllers on this site have different valves and use the Digital Outputs. Why there is a different valve on this one who knows? I noticed the Digital Outputs on the controller don't work (tested continuity) even though the LEDs change so perhaps thats why they put this valve here.
    Obviously I'm not a controls guy. That's why I ask it here and not on the Controls chat section.

  2. #2
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    481
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    Actuators often, such as some Belimo will use 0-10 vdc thus the reason for the analog output. This gives full modulating control.

    Ditigal or binary output is a 24vac signal driving the actuator full open or closed depending on how it is set up. Or it could be spring return closed.

  3. #3
    Join Date
    Jan 2013
    Location
    Central Arkansas
    Posts
    85
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    are they using the DO to supply the 24vac to the controller?

    Belimo TR24-SR-T US Spring Return Control Valve Actuator, 24VAC/DC, 18 in-lb, 2-10VDC (4-20mA) Proportional Control Signal,

  4. #4
    Join Date
    May 2004
    Location
    SE Pennsylvania
    Posts
    1,107
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    You will need someone familiar with that controller programming to change the damper output from the floating digital outputs to an analog. Sounds like someone installed the wrong actuator or the outputs were never reassigned afterwards.

  5. #5
    Join Date
    Apr 2008
    Location
    Tucson, AZ
    Posts
    137
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    @hvac69. I think you are right. Alas, I was hoping I could change the output to analog. I do not see clear instructions on the web anywhere. I have already called in the "control company" to come in on Monday to fix it.
    I would still like to know step by step what they do (knowledge for the sake of knowledge). There is too much to know, so we need the specialist. That protects their jobs anyway.

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