Prepare For Balancing; Balance Each Zone - Carrier TruVu VAVB3-E2 Installation And Startup Manual

Start-up

Prepare for balancing

Log in to the i-Vu® application with an Administrator or Installer security level, or use Field Assistant.
1
Make sure the air source and its controller have been properly started and can run as a stand-alone unit.
2
Make sure you have addressed, commissioned, and started the zone and bypass controllers, if present.
3
If a manual damper is installed upstream of the zone damper, verify that it is fully open before any balancing
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occurs.
Verify that any zone controller supplying multiple diffusers has a manual balancing damper installed on each
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duct for balancing the design airflow through each diffuser.
Disable the air source heating and cooling outputs using one of the following methods:
6
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 >
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Enable/Disable and enable Test and Balance Command.
Verify that the air source's supply static pressure setpoint is set to the system's design specification and that
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it does maintain the setpoint.

Balance each zone

In the i-Vu® or Field Assistant tree, select the zone controller that is physically closest to the air source. Go to
1
Properties > Control Program > Configuration > Service Configuration > Flow Control > Details tab.
Do one of the following:
2
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.
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
3
the branch ducts.
Single Duct or Parallel Fan zone terminals - Click Occupied Min Airflow to set the zone damper to its
4
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.
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure Occupied Min Airflow is selected,
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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.
If the terminal has ducted reheat, select the Flow Setpoint in the Locks section and enter Auxiliary Heat Min
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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.
Repeat steps 1 through 6 for each zone until all zones have been balanced. Make sure that you select
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Automatic Control before moving on to the next zone.
TruVu™ VAVB3-E2
Installation and Start-up Guide
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