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  1. ddcman

    VVT Systems

    A couple of questions I forgot to ask in reference to VVT Systems: 1. Is an airflow pickup required at zone damper locations. 2. How is VVT system different from a standard VAV box type of system. Thanks again!
  2. 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
  3. 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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