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.
In the Menu, select Flow Balance .
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.
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.
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.
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.
Select Next .
The flow balancing setpoints are now configured. Flow balancing at the selected flow setpoints begins automatically after you select Next .