VAV Airflow Setpoint Tracking

This workflow will test a VAV box for its ability to follow the Discharge Airflow Setpoint.

First, you will see the equipment’s preconditions.
Then, KODE runs a precondition check (verification process) to ensure (confirm) the equipment is ready for testing.
Finally, KODE adjusts the setpoints and monitors discharge airflow to determine if the VAV archives the intended setpoint.

Outcome 🎯

This test will identify issues with a VAV ability to follow airflow.

Recommended Schedule 📅

Run weekly per floor.

*Variations: There is a variant of this workflow that will work without the AHU requirement.

Workflow Overview

	Test Step	Workflow
1	Pre-condition Check	VAV is Occupied AHU Pressure > Min Pressure Threshold
2	Airflow SP - 1	Control: Command Airflow Setpoint Success: Airflow in range of setpoint +/- tolerance
3	Airflow SP - 2	Control: Command Airflow Setpoint Success: Airflow in range of setpoint +/- tolerance
4	Airflow SP - 3	Control: Command Airflow Setpoint Success: Airflow in range of setpoint +/- tolerance
5	Airflow SP - 4	Control: Command Airflow Setpoint Success: Airflow in range of setpoint +/- tolerance
6	Min Sequence Duration	What is the minimum length of time in seconds that a sequence should take to execute?

	Test Step	Result Description
1	AHU Min Pressure	If AHU Pressure is less than this number, the test automatically archives
2	Airflow SP - 1	What % of the Max Occ Cooling Flow do you want to set as the first target?
3	Airflow SP - 2	What % of the Max Occ Cooling Flow do you want to set as the second target?
4	Airflow SP - 3	What % of the Max Occ Cooling Flow do you want to set as the third target?
5	Airflow SP - 4	What % of the Max Occ Cooling Flow do you want to set as the fourth target?
6	SP Tolerance %	How close should the airflow be to the airflow setpoint to pass?
7	Max Sequence Duration	What is the maximum length of time in seconds that a sequence should take to execute?
8	Min Sequence Duration	What is the minimum length of time in seconds that a sequence should take to execute?
9	Stabilization Time	How long in seconds should the program wait when one sequence finishes, before moving onto the next?

	Reason	Description
1	Check and Adjust Calibration	Begin by verifying the calibration of all sensors involved in the test, especially the discharge airflow sensors and pressure transducers in the AHU. Calibration issues can lead to inaccurate readings that cause the system to deviate from the setpoint. If any sensors are found to be out of calibration, recalibrate them according to the manufacturer's specifications before rerunning the test.
2	Inspect VAV and AHU Components	Examine the physical condition of the VAV box and associated AHU components. Check for any signs of damage or wear that could affect performance, such as stuck dampers, leaks in the ductwork, or malfunctioning actuators. If any issues are found, perform the necessary repairs or replacements. Ensure all components are clean and free from obstructions that could impair airflow.
3	Review System Configuration and Sequencing	Evaluate the VAV box programming and configuration settings. Confirm that the airflow setpoints, sequence durations, and stabilization times are correctly set according to the operational requirements. Adjust the control sequences if needed to ensure they align with the current operational strategy and performance expectations. It may also be helpful to consult with a control specialist to optimize the sequence of operations for better performance.

If you need assistance with interpreting your results, reach out to the support team at [email protected].

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