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

Step 1: 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 the zone and bypass controllers have been addressed, commissioned, and started.
4
Verify that a manual damper is installed upstream of the zone damper. This damper will be used to 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.
5
Verify that zone controllers supplying multiple registers have manual dampers on each register branch duct
for balancing the design airflow through each register.
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 RTU Open or WSHP Open controller. Go to Properties >
○
Configuration > Service Configuration > Service Test and enable Service Test and Fan Test. Make sure
all other outputs are disabled.

Step 2: 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 > Pressure Dependent Control >
Details tab.
2
Do one of the following:
Single Duct or Parallel Fan zone terminals – Click Cool Max to override the zone damper to its 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
○
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.
3
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
the branch ducts.
4
On the zone's Pressure Dependent Control > Details tab, click Cool Min to set the zone damper to its 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.
5
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure Cool Min is active, select the
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.
VVT Zone II Controller
Installation and Start-up Guide
43
Start-up
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