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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

Take a peek inside the Balancing HVAC System: Balancing the VAV System Mobile App

Included Features

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Included Fields

Customize to add, remove, or edit any of the fields below.

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    Job Site

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    Location

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    HVAC Technician Name

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    Date

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    Signature

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    The general procedure for balancing a VAV system is.

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    Determine the required maximum air volume to be delivered by the supply and return air fans.

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    Obtain fan curves on these units, and request information on surge characteristics from the fan manufacturer.

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    If inlet vortex damper is used, obtain the fan manufacturer’s data on damper control (deaeration) of the fan when used with the damper.

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    Obtain from the manufacturer the minimum and maximum operating pressures for terminal or variable-volume boxes to be used on the project.

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    Construct a theoretical system curve, including an approximate surge area.

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    1. The minimum speed that can produce the necessary minimum box static pressure at minimum flow still in the fan’s stable range

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    2. The maximum speed necessary to obtain maximum design flow

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    Position the terminal boxes to the proportion of maximum fan air volume to total installed terminal maximum volume.

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    Set the fan to operate at approximate design speed (increase about 5% for a fully open inlet vane damper).

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    Check a representative number of terminal boxes.

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    Run a total air traverse with a pitot tube.

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    Increase speed if static pressure and/or volume are low.

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    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.

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    Proportion the outlets, and verify design volume with the VAV box on maximum flow.

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    Set terminals to minimum, and adjust the inlet vane or speed controller until minimum static pressure and airflow are obtained.

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    Temperature control personnel, balancing personnel, and the design engineer should agree on the final placement of the sensor for the static pressure controller.

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    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.

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    Operate the system on 100% outside air (weather permitting), and check supply and return fans for proper power and static pressure.

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    Comments

  • ...and More!

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