The Flow Balance function of the Commission mobile application is used to air balance terminal boxes controlled by a VAV controller. This function automates most of the air balance procedure but it also allows you to manually check out the flow balance by driving the damper to a specified position, a flow setpoint, or a flow value.
Flow balancing, also known as air balancing, is the process you use to calibrate an installed VAV terminal unit so that the airflow indicated by the VAV controller is accurate, relative to the true airflow delivered by the VAV terminal unit.
After the Electrician installs, wires, and powers the VAV controller, the controller automatically calibrates the damper stroke. Upon start-up, the VAV controller will automatically perform a damper stroke angle calibration where the damper rotates to each mechanical end stop. After the VAV controller has completed this process, it is ready to be accessed from the Commission mobile application to perform flow balancing.
When you select an VAV controller from the Commission mobile application, a Variable Air Volume Data object is automatically created in the controller. This object has values that read the Airflow Sensor terminal and values that configure the Damper Control 1 of the VAV controller. The VAV controller also contains logic to assist in the flow balancing calibration.
For more information, see Commission Mobile Application Overview
.
Note:
The Commission mobile application supports flow balancing for VAV controllers with the data object
Variable Air Volume
only. The Commission mobile application does not support flow balancing for VAV controllers with custom balancing programs.
Flow Balancing Workflow
Use this workflow to perform flow balance on a single VAV controller controller, using the Commission mobile application. Related information can be found in the section after the flowchart.
For more information, see Flow Balancer Workflow
.
Configure Setpoints
You configure the VAV controller controller setpoints to prepare the parameters by which the controller is balanced. These setpoints include the maximum flow setpoint, selected by default, and the intermediate and minimum flow setpoints, which are optional.
For more information, see Configuring VAV Controller Setpoints
.
Perform Manual Checkout
After completing the automated flow balancing process, you can use manual checkout to verify and command the air flow values for one or multiple VAV controllers.
For more information, see Performing Manual Checkout of Air Flow
.
Verify Damper Rotation
You can manually verify the direction of the damper rotation of an VAV controller to verify that the actuator rotates clockwise or counterclockwise to open.
For more information, see Manually Verifying the Direction of Damper Rotation
.
Flow Balance Reports
The Commission mobile application provides the user with a means to generate a flow balance report that documents several values:
Box capacity at 1 inch H20 (249 Pa)
Box measured flow
Hood measured flow for each setpoint used during balancing
Actuator stroke and rotation
Flow balance time and date
Any comments
Using the Commission mobile application, you can create, append, and delete flow balance reports. Flow balance reports are stored on the Commission mobile application mobile device and can be retrieved and shared using the file and e-mail applications of that mobile device or Windows 10 laptop.
For more information, see Flow Balance Reports
.
Flow Balancer Workflow
Error Message is Displayed During Rotation Check of the VAV Controller