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control of return,and supply fans

zepfan Member Posts: 312
does anyone know of a control that can be installed to control a supply fan based on duct static pressure,and a return fan based on building pressure,that has a digital readout to tell what the current conditions are? We have a job where the current ems did this,and it no longer works (it was out dated when it did work) The rooftop units control their own staging,and temperatures the ems only controlled the fans.The existing pressure controls can send either a 0-10vdc or a 4-20 ma signal,so I would like to keep them.If anyone knows of such a control please post.Thanks to all.


  • RJ_4
    RJ_4 Member Posts: 484
    Try looking into the Honeywell T775 stand alone control series T775U2006 ? or Johnson controls equivalent
  • pecmsg
    pecmsg Member Posts: 1,963
    and don't forget Fire Command being capable to shut down when needed
  • RJ_4
    RJ_4 Member Posts: 484
    I forgot why cant you implement new vfd's AC Tech has some good choices
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