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1B/2B - Low airflow

Alarm conditions:

1B - Low supply airflow. Supply flow not reaching 80% of setpoint in normal mode or 95% of setpoint while calibrating VAV.

2B - Low exhaust airflow. Exhaust flow not reaching 80% of setpoint in normal mode or 95% of setpoint while calibrating VAV.

Possible causes:

  1. Too high pressure in the duct system (wrong size ducts, closed diffusers, blocked intake grills, stuck dampers),
  2. Dirty filters,
  3. Disconnected, clogged, bent pressure tubes.

Troubleshooting:

 

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