What does AHU-FC09 mean?
It's too hot outside to hit SAT setpoint without mechanical cooling, but the AHU is still in economizer mode.
Why does it matter?
Wasted economizer dwell — the unit isn't conditioning the space because the airside physics won't allow it. Often a wrong high-limit setting.
What should you do?
Adjust the economizer high-limit setpoint based on local climate. Check the differential-enthalpy or fixed-dry-bulb economizer enable logic.
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Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated