Medium
  • Apple

    iPhone, iPad

  • Android

    Android

  • Windows

    Windows Desktop

Balancing HVAC System: Balancing the VAV System Mobile App

A well performed testing, adjusting and balancing (TAB) of a HVAC system is essential for the proper performance of that system and can enhance indoor air quality and efficiency. The Balancing HVAC System: Balancing the VAV System mobile app was developed to assist in air balancing and air flow of air conditioning and water cooling systems to improve indoor air quality. A systematic approach is called for when balancing a HVAC air and water systems. The app includes is a general procedures that can be applied to all systems. Routine testing will improve energy efficacy. The app provides the general procedure for balancing a VAV system.


  • Lendlease
  • The Cooperative
  • PG&E
  • Toys R Us
  • Red Bull
  • Mirvac

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Included Features

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Included Fields

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  • Ico textbox Job Site
  • Ico multiline Location
  • Ico textbox HVAC Technician Name
  • Ico date Date
  • Ico signature Signature
  • Ico statictext The general procedure for balancing a VAV system is.
  • Ico checkbox Determine the required maximum air volume to be delivered by the supply and return air fans.
  • Ico checkbox Obtain fan curves on these units, and request information on surge characteristics from the fan manufacturer.
  • Ico checkbox If inlet vortex damper is used, obtain the fan manufacturer’s data on damper control (deaeration) of the fan when used with the damper.
  • Ico checkbox Obtain from the manufacturer the minimum and maximum operating pressures for terminal or variable-volume boxes to be used on the project.
  • Ico checkbox Construct a theoretical system curve, including an approximate surge area.
  • Ico checkbox 1. The minimum speed that can produce the necessary minimum box static pressure at minimum flow still in the fan’s stable range
  • Ico checkbox 2. The maximum speed necessary to obtain maximum design flow
  • Ico checkbox Position the terminal boxes to the proportion of maximum fan air volume to total installed terminal maximum volume.
  • Ico checkbox Set the fan to operate at approximate design speed (increase about 5% for a fully open inlet vane damper).
  • Ico checkbox Check a representative number of terminal boxes.
  • Ico checkbox Run a total air traverse with a pitot tube.
  • Ico checkbox Increase speed if static pressure and/or volume are low.
  • Ico checkbox Run Steps (7) through (10) with the return or exhaust fan set at design flow as measured by a pitot-tube traverse and with the system set on minimum outside air.
  • Ico checkbox Proportion the outlets, and verify design volume with the VAV box on maximum flow.
  • Ico checkbox Set terminals to minimum, and adjust the inlet vane or speed controller until minimum static pressure and airflow are obtained.
  • Ico checkbox Temperature control personnel, balancing personnel, and the design engineer should agree on the final placement of the sensor for the static pressure controller.
  • Ico checkbox Check return air fan speed or its inlet vane damper, which tracks or adjusts to the supply fan airflow, to ensure proper outside air volume.
  • Ico checkbox Operate the system on 100% outside air (weather permitting), and check supply and return fans for proper power and static pressure.
  • Ico multiline Comments
  • ...and More!

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