VAV balancing and configuration
Topics in this section are for control technicians or engineers who will be balancing the
airflow in BAC-8000 or BAC-9000 series controllers. The BAC-5051E includes the following
features for balancing, configuring, and commanding airflow in a VAV controller.
l VAV balancing on page 55
l Configuring VAV setpoints on page 56
l Commanding and monitoring airflow on page 57
VAV balancing
The airflow balancing procedure described in this topic requires the following items.
l A flow hood or other accurate method to measure airflow.
l The engineering design specifications for the minimum and maximum airflow
setpoints.
l A user name and password with permission to the VAV balancing feature in the
BAC-5051E.
Note: If the VAV unit is a heat only or cooling only unit, the airflow setpoints for the unused mode
must be set within the range of the mode in use. Failure to set the unused setpoints
correctly will result in unpredictable or erroneous air balancing settings.
Note: Starting the balancing procedure erases all previous airflow correction factors. The airflow
readings displayed on the VAV balancing page are the actual uncorrected airflow readings
as measured by the controller
1 Use an Internet browser to log in.
2 From the Advanced group click Balancing.
3 Enter a range of device instance values for the VAV units to be balanced.
4 Click Discover. Up to 50 devices will be added to the list.
5 Select a VAV unit from list of discovered units. The background of the selected unit
changes to yellow.
6 At the bottom of the page click the Balance tab.
7 Click Start Balancing. The controller commands the VAV controller to position the
damper for maximum airflow.
8 Wait for the Actual Airflow value to stabilize.
9 With a flow hood, measure and note the actual airflow.
10 Enter the measured airflow in the Measured Max textbox. The controller then
commands the VAV controller to position the damper for minimum airflow.
11 Again, wait for the Actual Airflow value to stabilize.
12 With a flow hood, measure and note the actual airflow.
BAC-5051E Router Section 5: Advanced features
Revision J 55
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