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Balancing the system using Test & Balance tool
Use the Test & Balance tool to manipulate the controllers associated with an air source, but not the air source
itself or heating and cooling equipment such as chillers and boilers. See the Test & Balance Help for more
information on using the tool.
Most VAV system airflow designs are based on cooling requirements which require a greater cfm (liters/second)
flow than heating requirements. Using this balancing procedure, you adjust the cooling airflow first. If the heating
and cooling maximum airflow requirements are the same, you will not need to balance the heating airflow.
NOTE We recommend that the total heating minimum airflow settings for all the zones in the system be set to
maintain the air source's design minimum heat cfm (liters/second) airflow across its heat exchanger to prevent
damage to the equipment.
To calibrate VAV zone airflow
Select the VAV zone air terminal in the tree.
1
NOTE You can select View > Device ID or View > Primary Use to show this information next to each item in
the tree.
Select the Test and Balance tab.
2
NOTE If
do before calibration can occur.
Verify that the air source is off and that airflow has stopped.
3
Click Zero Calibrate.
4
NOTE The table below describes each damper command. Commands with a
commands improve system accuracy. Do these in order from top to bottom for best results.
The status bar shows Damper Moving. Wait until it shows Damper Ready.
5
If the controller has an external actuator, do the following:
6
a)
Type the Measured Flow in the fields beside Zero Calibrate.
b)
Click the Current Sensor Reading button to copy the value to the Sensor Reading field, or type an
adjusted value in the field.
Turn on the air source.
7
For each additional calibration step that you want to perform, do the following:
8
a)
Click its Damper Command button.
b)
Wait for Damper Ready.
c)
Enter the Measured Flow and Sensor Reading as described in step 6.
Click Apply to send your changes to the controller and update the Last Calibration Date on the air source's
9
page.
NOTE If desired, you can click Apply after each calibration step.
10 Remove any locks you have applied. See To view, lock, or unlock an air terminal function.
11 Click Automatic to return the controller to normal operation.
TruVu™ VAVB3-E2
Installation and Start-up Guide
or
appear on the status bar, see Air terminal calibration status to determine what you must
59
Start-up
are required. Optional
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