What does AHU-X15 mean?
The supply-duct static-pressure setpoint sits at one value whenever the unit runs — there is no trim-and-respond reset from the VAV box dampers.
Why does it matter?
Fan power scales with the cube of flow and roughly with static; holding design static at part load is the single largest avoidable fan cost on a VAV system.
What should you do?
Enable static-pressure reset per ASHRAE Guideline 36 (trim-and-respond on damper positions), with a sensible minimum; verify the most-open box stays satisfied.
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Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated