Start-up
VAV Zone II Controllers
CARRIER CORPORATION ©2019
Installation and Start-up Guide
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43
Balancing the system using the i-Vu®/Field Assistant applications
Most VAV system airflow designs are based on cooling requirements which require a greater cfm (liters/second)
flow than heating requirements. Using this balancing procedure, you adjust the cooling airflow first. If the heating
and cooling maximum airflow requirements are the same, you do not need to balance the heating airflow.
NOTE
We recommend that the total heating minimum airflow settings for all the zones in the system be set to
maintain the air source’s design minimum heat cfm (liters/second) airflow across its heat exchanger to prevent
damage to the equipment.
The following procedures instruct you to use the i-Vu® application or Field Assistant to balance the system.
However, you can also use the Test & Balance tool that includes global commands to assist you in balancing the
system.
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 you have addressed, commissioned, and started the zone and bypass controllers, if present.
4
If a manual damper is installed upstream of the zone damper, verify that it is fully open before any balancing
occurs.
5
Verify that any zone controller supplying multiple diffusers has a manual balancing damper installed on each
duct for balancing the design airflow through each diffuser.
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 AHU controller. Go to
Properties
>
Control Program
tab
>
Enable/Disable
and enable
Test and Balance Command
.
7
Verify that the air source's supply static pressure setpoint is set to the system's design specification and that
it does maintain the setpoint.
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
>
Flow Control
>
Details
tab.
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