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BALANCING
Pressure Independent
Before starting to Balance the system, check if the following parameters are correctly configured in the Configuration menu:
• VAV Box Type
• Flow at 1-inch water column
• Airflow Sensor Pressure Range
• Actuator Type
• Floating Actuator Time
Airflow Balancing settings can be found on the Balancing page of the Setup menu.
The recommended process for Balancing the system is:
1. On page "1/2 Balancing (PI)", check the Minimum, Maximum Cooling, Maximum Heating and Reheat airflow setpoints are correctly config-
ured for the zone.
2. Check airflow sensor is correctly calibrated at zero:
• On page "2/2 Balancing (PI)", set Damper Override to Close.
• Wait for measured "Airflow level" to stabilize and confirm the value is less than the desired Minimum Airflow. If not, confirm damper is
closed and the airflow sensor is auto-calibrated at zero.
3. Before setting the Minimum and Maximum Cooling airflow, make sure that when fully open, the airflow is at least 40-60 CFM higher than
the planned Maximum Cooling airflow. Otherwise, the control will be erratic.
Minimum and Maximum Cooling Airflow
When damper is fully open, the airflow must be at least 40-60 CFM higher than the planned Maximum Cooling airflow. Failure to follow these instruc-
tions can result in erratic airflow control depending on the system design.
4. Calibrate sensor at Minimum airflow:
• On page "2/2 Balancing (PI)", set the Damper Override to Minimum Flow. The displayed Airflow Setpoint will use the value of Minimum
Airflow.
• Wait for the Controller measured "Airflow level" to stabilize.
• Take a reading of the actual airflow using a calibrated balometer.
• Enter the actual airflow as the "Balometer" value on "2/2 Balancing (PI)". The Controller will calculate and display a new Minimum Flow
Offset.
• Wait for the measured "Airflow level" to stabilize again. The Airflow level should now match the Airflow setpoint. Repeat if necessary.
5. Calibrate sensor at Maximum Cooling airflow:
• On page "2/2 Balancing (PI)", set the Damper Override to Maximum Cooling. The displayed Airflow Setpoint will use the value of Maximum
Cooling Airflow.
• Wait for Controller measured "Airflow level" to stabilize.
• Take reading of actual airflow using a calibrated balometer.
• Enter the actual airflow as the "Balometer" value on "2/2 Balancing (PI)".
• The Controller will calculate and display a new Maximum Flow Offset.
• Wait for the measured "Airflow level" to stabilize again. Airflow level should now match the Airflow setpoint. Repeat if necessary.
6. On page "2/2 Balancing", revert the Damper Override to None allowing the system to return to normal operation.
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Due to our policy of continuous product innovation, some specifications may change without notification.
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