Carrier TruVu VVTZC-E2 Installation And Startup Manual page 62

Wiring inputs and outputs
Verify that zone controllers supplying multiple registers have manual dampers on each register branch duct
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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.
○
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
In the i-Vu® or Field Assistant tree, select the zone controller that is physically closest to the air source. Go to
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Properties > Control Program > 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 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.
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
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the branch ducts.
On the zone's Pressure Dependent Control > Details tab, click Cool Min to set the zone damper to its cooling
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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 Vent to
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adjust the airflow to the design value. If you do not have a design value, leave the value at 50% for minimum
ventilation.
Series Fan Zone Terminals only - If the zone maximum heating airflow design requirements are the same as
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cooling, the Heating Max Damper Position should be 100%, same as the Cooling Max Damper Position. If
the heating requirement is less than the cooling requirement, type the appropriate value in Heating Max
Damper Position per the design requirements.
If the terminal has ducted reheat, click Reheat Min to force the zone to its reheat damper position. Type the
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desired damper position next to Reheat Min to adjust the airflow to its design reheat position.
If the zone maximum heating airflow design requirements are the same as cooling, skip this step. If they are
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less than cooling, click Heat Max to force the zone to its maximum heating position. Check the zone for
design heating maximum airflow using certified measuring devices. Type the damper position next to Heat
Max.
TruVu™ VVTZC-E2
Installation and Start-up Guide
56
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