TAB Journal Summer 2019 - 16

CORRECT SETUP AND BALANCING OF A

VAV AIR HANDLING SYSTEM
Vern Gray, TBE, CxA
Test and Balance Corporation

Introduction
In 16-plus years of experience working in the testing &
balancing (TAB) and commissioning (Cx) industries on testing
and/or Cx variable air volume (VAV) systems, I have come
across numerous instances where it is clearly evident that a
VAV system has not been setup correctly (see right sidebar).
All of these issues have a common denominator: they
are either energy wasteful and/or fail to maintain project
document required minimum OA ventilation airflow under
all operating conditions. Stated another way, incorrect VAV
system setup inflicts higher operating costs and/or potential
indoor air quality problems on building owners.

16

The correct setup of a VAV system is not rocket science,
but it does require the TAB technician to be deliberate and
methodical, and to follow an established, systematic protocol
until all components are operating as designed. Towards that
goal, I have outlined below the steps that I take for properly
setting up a VAV system.

Method
The fi rst step in achieving a successful VAV air handling
system setup is to thoroughly understand the system as
designed. Has the system been designed with diversity in
mind or not: such that the air handling unit (AHU) scheduled
SA airflow equals the summation of all the individual VAV

TAB Journal Summer 2019



TAB Journal Summer 2019

Table of Contents for the Digital Edition of TAB Journal Summer 2019

TAB Journal Summer 2019 - Cover1
TAB Journal Summer 2019 - Cover2
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TAB Journal Summer 2019 - Cover3
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