Start-up
TruVu™ VAVB3
-E2
CARRIER CORPORATION ©2022
Installation and Start-up Guide
All rights reserved
59
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
1
Select the VAV zone air terminal in the tree.
NOTE
You can select
View
>
Device ID
or
View
>
Primary Use
to show this information next to each item in
the tree.
2
Select the
Test and Balance
tab.
NOTE
If
or
appear on the status bar, see Air terminal calibration status to determine what you must
do before calibration can occur.
3
Verify that the air source is off and that airflow has stopped.
4
Click
Zero Calibrate
.
NOTE
The table below describes each damper command. Commands with a
are required. Optional
commands improve system accuracy. Do these in order from top to bottom for best results.
5
The status bar shows
Damper Moving
. Wait until it shows
Damper Ready
.
6
If the controller has an external actuator, do the following:
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.
7
Turn on the air source.
8
For each additional calibration step that you want to perform, do the following:
a)
Click its Damper Command button.
b)
Wait for
Damper Ready
.
c)
Enter the
Measured Flow
and
Sensor Reading
as described in step 6.
9
Click
Apply
to send your changes to the controller and update the
Last Calibration Date
on the air source's
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.