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Start-up
Before starting the air source fan, make sure the zone terminal dampers are not closed. Starting the fan
with dampers closed will damage the system ductwork.
Commissioning the VVT Zone Controller
Using Field Assistant or i-Vu:
Calibrate the damper travel.
1
a)
Go to Properties > Configuration > Service Configuration > Pressure Dependent Control > Details
tab > Test and Balance. Click Calibrated Damper Close
b)
Click
c)
Click
For Parallel or Series Fan terminals – in the Locks section, select the Fan's Lock value to checkbox, then
2
select On in the droplist. Click Apply. Verify the fan's operation.
For modulating hot water reheat – Go to Properties > I/O Points tab, then lock Hot Water Valve to 100%.
3
If the controller is configured for Single Duct, make sure the air source fan is on. If ducted heat, verify the
heat works by verifying that the SAT rises. For baseboard heat, physically check the heating element for
proper temperature rise. Release the Hot Water Valve.
Release the fan.
4
If the controller is part of a linked system, verify Linkage > Airside Linkage Status shows Active.
5
CAUTION Pressing the actuator release button and moving the damper or disconnecting the actuator ribbon
connector while the bypass controller is powered will cause the damper position to be out of calibration. To
recalibrate the damper position, you must perform steps 1a–1c above or power cycle the controller.
Balancing the system
Most VVT system airflow designs are based on cooling requirements which require a greater CFM flow than
heating requirements. Using this balancing procedure, you will adjust the cooling airflow first. If the heating
and cooling maximum airflow requirements are the same, you will not need to balance the heating airflow.
There are two methods of balancing the system. Using the Test & Balance program or using i-Vu/Field
Assistant. Test & Balance can perform all of the steps outlined here, including shutting down the Linked air
source and performing global commands to all zones in the system. Items 1 through 5 in Step 1 should be
done prior to using Test & Balance. Please refer to Test & Balance's Help files for details on the required
steps to complete the balancing procedure.
Complete the following steps when using i-Vu or Field Assistant to perform the system balancing.
NOTE We recommend that the heating minimum airflow settings for all the zones in the system be set to
maintain the air source's design minimum heat CFM airflow across its heat exchanger to prevent damage to
the equipment.
36
Calibrated Damper Open
and verify it travels to the full open.
Automatic Control
to return the damper to normal operation.
and verify it goes to the closed position.
VVT Zone Controller
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