Step 1: Prepare For Balancing; Step 2: Balance Each Zone - Carrier VVT Zone Installation And Startup Manual

Step 1: Prepare for balancing

Log in to i-Vu with an Administrator or Installer security level, or use Field Assistant.
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Make sure the air source and its controller have been properly started and can run as a stand-alone unit.
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Make sure the zone and bypass controllers have been addressed, commissioned, and started.
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Verify that a manual damper is installed upstream of the zone damper. This damper will be used to
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adjust the maximum design airflow to the space when the zone damper is at 100% open. We strongly
recommend that you do not use the damper Cool or Heat Max damper configuration setting for this
purpose. Exception: If the design maximum airflow for one mode is less the other, the maximum damper
position configuration may be used to adjust the designed airflow of that mode.
Verify that zone controllers supplying multiple registers have manual dampers on each register branch
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duct for balancing the design airflow through each register.
Disable the air source heating and cooling outputs using one of the following methods:
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Physically disconnect the air source controller's output wiring to the unit, then enable the fan.
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In the i-Vu or Field Assistant tree, select the RTU Open or WSHP Open controller. Go to Properties >
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Configuration > Service Configuration > Service Test and enable Service Test and Fan Test. Make
sure all other outputs are disabled.

Step 2: Balance each zone

In the i-Vu or Field Assistant tree, select the zone controller that is physically closest to the air source. Go
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to Properties > Equipment > Configuration > Service Configuration > Pressure Dependent Control >
Details tab.
Do one of the following:
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Single Duct or Parallel Fan zone terminals – Click Cool Max to override the zone damper to its
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maximum open position. Check the zone for design cooling maximum airflow using certified
measuring devices. Make adjustments using the manual volume damper located upstream of the
zone damper.
Series Fan zone terminals – Click Damper Full Close to override the zone damper to its fully closed
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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. When the fan starts, click Cool Max to open the zone damper to its maximum position.
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, verify that the zone terminal plenum air intakes do not have a positive
airflow. If so, adjust the manual volume damper located upstream of the zone damper so that the
airflow is not positive or negative.
Note the zone's name in the tree. You will need it when setting the system static pressure setpoint.
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers
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in the branch ducts.
On the zone's Pressure Dependent Control > Details tab, click Cool Min to set the zone damper to its
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cooling minimum position. Type the desired damper position next to Cool Min to adjust the airflow to the
design value. If you do not have a design value, set the value to no less the 10% for minimum ventilation.
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure Cool Min is active, select the
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Fan's Lock value to checkbox, then select On in the droplist. 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.
Click Vent to set the zone damper to its ventilation position. Type the desired damper position next to
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Vent to adjust the airflow to the design value. If you do not have a design value, leave the value at 50%
for minimum ventilation.
VVT Zone Controller 37