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  • Users: ddcman
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  1. ddcman

    VVT Systems

    Can anyone explain how a Variable Volume Variable Temperature (VVT) HVAC control system works, specifically, how should the zone dampers be controlled, and how should the bypass damper be controlled. Thanks
  2. ddcman

    Piping low port of a duct Static Press Probe for VFD control?

    Typically, the high port of a duct static pressure transmitter is piped 2/3 distance down the longest supply duct when used for control of an air handling unit variable frequency drive. It is common practice to simply leave the low port vented to atmosphere. This causes problems if the...

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