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  1. #1
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    Jan 2015
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    Lennox economizer logic module

    I'm new to economizers I'm dealing with a KGA series lennox rtu with a economizer I have the literature and diagrams for the W7212 module but it gives me no idea of what the A B C and D enthalpy changeover set points are can some one shed some light on that for me please

  2. #2
    Join Date
    Aug 2007
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    Southern,Ca
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    Control Setting Enthalpy Setpoint At 50% RH
    A* 73 F (23 C)
    B 70 F (21 C)
    C 67 F (19 C)
    D 63 F (17 C)

  3. #3
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    Aug 2007
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    does that help you at all?

  4. #4
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  5. #5
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    Jan 2015
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    Yes it does thank you I will have to register with Lennox to access their info which I will do tomorrow could you explain a little on what these different temp set points accomplish within the enthlapy controls

  6. #6
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    Aug 2007
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    Southern,Ca
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    See if this works better


  7. #7
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    In a nut shell the Enthalpy control looks at the Total Heat taking into account the Latent heat and sensible heat and it has predetermined setpoints A,B,C,D and say for instance you have the control set at the A position. What that means is that at 50% outside relative Humdity and 73 degrees the economizer dampers will open and turn off the mechanical cooling (Compressor) and Open the Outside air damper and pull in fresh air(free cooling)

  8. #8
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    Jan 2015
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    Ok great that answered my question perfectly thank you crstephens83

  9. #9
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    Yep, it's Chris by the way.

  10. #10
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    Oct 2011
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    In Chicago we set them at D for dummy.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  11. #11
    Join Date
    Oct 2013
    Location
    Alberta Canada
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    Dummy here too. And if I get complaints with that it gets a settable dry bulb sensor.

  12. #12
    Join Date
    Oct 2004
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    Central WA
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    Always set to "D" - it's a callback preventer. That and making sure you actually have a two-stage thermostat so that it can override to mechanical cooling if free cool doesn't keep up.

    That module and the part number you referenced are honeywell. They have a nice write up on those at customer.honeywell.com

  13. #13
    Join Date
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    Quote Originally Posted by 2sac View Post
    In Chicago we set them at D for dummy.
    So would A stand for Albert then ?

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