Start-up
TruVu™ VAVB3
-E2
CARRIER CORPORATION ©2022
Installation and Start-up Guide
All rights reserved
58
Prepare for balancing
1
Log in to the i-Vu® application with an Administrator or Installer security level, or use Field Assistant.
2
Make sure the air source and its controller have been properly started and can run as a stand-alone unit.
3
Make sure you have addressed, commissioned, and started the zone and bypass controllers, if present.
4
If a manual damper is installed upstream of the zone damper, verify that it is fully open before any balancing
occurs.
5
Verify that any zone controller supplying multiple diffusers has a manual balancing damper installed on each
duct for balancing the design airflow through each diffuser.
6
Disable the air source heating and cooling outputs using one of the following methods:
○
Physically disconnect the air source controller’s
output wiring to the unit, then enable the fan.
○
In the i-Vu® or Field Assistant tree, select the AHU controller. Go to
Properties
>
Control Program
tab
>
Enable/Disable
and enable
Test and Balance Command
.
7
Verify that the air source's supply static pressure setpoint is set to the system's design specification and that
it does maintain the setpoint.
Balance each zone
1
In the i-Vu® or Field Assistant tree, select the zone controller that is physically closest to the air source. Go to
Properties
>
Control Program
>
Configuration
>
Service Configuration
>
Flow Control
>
Details
tab.
2
Do one of the following:
○
Single Duct or Parallel Fan zone terminals
–
Click
Cool Max Airflow
to override the zone control and
increase the airflow to the cooling maximum cfm (liters/second) . Check the zone for design cooling
maximum airflow using certified measuring devices. Enter the measured cfm (liters/second) and click
the arrow to enter the current sensor reading value.
○
Series Fan zone terminals
–
Click
Damper Full Close
to override the zone damper to its fully closed
position. Wait 30 seconds after the damper is closed, select the
Fan
's
Lock value to
checkbox, then
select
On
in the droplist. Click
Apply
. You must follow this procedure to prevent the fan from turning
backwards. Check the zone for design cooling maximum airflow using certified measuring devices. See
the zone terminal manufacturer's instructions to adjust the fan speed to meet design airflow
requirements. After you set the fan speed to deliver the
Cool Max Airflow
, click the
Cool Max Airflow
.
Verify the airflow using a certified measuring device. Enter the measured cfm (liters/second) and press
the arrow to enter the current sensor reading value. Verify that the zone terminal plenum air intakes do
not have a positive airflow.
3
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
the branch ducts.
4
Single Duct or Parallel Fan zone terminals - Click
Occupied Min Airflow
to set the zone damper to its
minimum airflow position. Verify the airflow using a certified measuring device. Enter the measured cfm
(liters/second) and click the arrow to enter the current sensor reading value.
5
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure
Occupied Min Airflow
is selected,
select the
Fan
's
Lock value to
checkbox, then select
On
in the drop-down list. Click
Apply
. See the zone
terminal manufacturer's instructions on adjusting the fan speed to meet design airflow requirements. When
finished, clear the
Fan
's
Lock value to
checkbox.
6
If the terminal has ducted reheat, select the
Flow Setpoint
in the
Locks
section and enter
Auxiliary Heat Min
Airflow
if it is greater than the
Occupied Min Airflow
. Select
Auxheat
and enter 100%. Click
Apply
. Verify the
supply air temperature rises for ducted heat. For non-ducted heat, physically verify that the heat is energized.
Deselect a
Flow Setpoint
and
Auxheat
and click
Apply
when finished.
7
Repeat steps 1 through 6 for each zone until all zones have been balanced. Make sure that you select
Automatic Control
before moving on to the next zone.
