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How to How to 9/8/2022
Products: Commission, MP-V
Functionalities: Engineering, BACnet/IP devices
Product version: 2022

Configuring MP-V Controller Setpoints

You configure the MP-V controller setpoints to set up the parameters by which the controller is flow balanced. These setpoints include the maximum flow setpoint, selected by default, and the intermediate and minimum flow setpoints, which are optional.

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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 MP-V Controller Setpoints .

Flow Balance at Setpoints

Using the Commission mobile application, you flow balance a VAV unit at each designated setpoint to achieve the desired air flow.

For more information, see Flow Balancing at Minimum, Intermediate, or Maximum Flow Setpoint .

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 .

To configure MP-V controller setpoints
  1. In the Menu, select Flow Balance .

  2. In the Air Balancing Setpoints view, configure the following setpoints:

    • Direction of rotation to open : Select CW for clockwise or CCW for counterclockwise. The direction of rotation depends on the rotation direction of the damper blade in the air vent.

    • Measurement System : Select either US or Metric .

    • Flow Tolerance : Type the tolerance, in %, associated with the Maximum flow , Intermediate flow , and Minimum flow setpoints. The flow tolerance is the % range above and below the Flow Setpoint that the Box Measured Flow must measure within for 10 seconds before calibration is complete. For example, if you set the Flow Tolerance to 10% and the Flow Setpoint is 100 cfm, the Box Measured flow must measure at 90 cfm for 10 seconds before calibration is complete.

    • Flo w at 1 in H20 or 249 Pa : type the rated flow of the terminal box at 1.0 inch water column (249 Pa). This value is commonly read from a chart associated with the flow pickup.

    • Maximum flow : Type the maximum flow setpoint associated with the terminal box. The maximum airflow setpoint is determined by specifications for the room being ventilated.

    Important:

    In the Air Balancing Setpoints view, the Intermediate flow and Minimum flow setpoint check boxes are cleared by default. However, it is recommended that you include either or both these setpoints for flow balancing, in addition to the Maximum flow setpoint. Doing so allows you to achieve greater flow accuracy across the operating flow range of the VAV unit.

  3. For Intermediate flow , type a value in the text box or clear the check box. The intermediate setpoint can be used as a threshold for reheat coils to start heating the air.

    • If this setpoint will be used, type an initial value for the intermediate flow setpoint in the text box.

    • If this setpoint will not be used, clear the check box.

  4. For Minimum flow , type a value in the text box or clear the check box. The minimum airflow setpoint is determined by specifications for the room being ventilated.

    • If this setpoint will be used, type an initial value for the intermediate flow setpoint in the text box.

    • If this setpoint will not be used, clear the check box and then type 0 (zero) in the text box.

  5. Select Next .

The flow balancing setpoints are now configured. Flow balancing at the selected flow setpoints begins automatically after you select Next .

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