What does AHU-X04 mean?
The supply-air-temp setpoint never moves across the analysis window, indicating no trim-and-reset or load-based reset is happening.
Why does it matter?
A static SAT setpoint forces VAV boxes to reheat at low loads (excess cooling) or strain at high loads. ASHRAE 90.1 requires SAT reset on most multi-zone AHUs for this reason. Often a 15–20% AHU energy reduction is left on the table.
What should you do?
Implement trim-and-reset based on the most-open VAV box, or a simple OAT-based reset. Confirm the BMS reset logic actually has authority over the SAT setpoint.
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Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated