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  1. #1

    Post

    Saw the new forum controls and thoguth I'd share an old pic I have of an old mechancial step controller for a VAV unit we take care of...


    Just sharing...
    AllTemp Heating & Cooling

  2. #2
    Join Date
    Feb 2005
    Posts
    4
    If you want to upgrade that old S984 consider Johnson System350. I have upgraded lots of those with the 350's at a fraction of the price. Just my 2 cents worth...

  3. #3
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,819
    Typically the micro switches fail before anything else. You can actually buy the exact Honeywell switches across the counter at Graingers and rebuilt the thing as long as the electronics work, which I bet they do.

    I have a lot of those out in the field on pneumatic controls and I rebuilt them. It's relatively easy if you are working on a bench in comfort.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

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