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19A/20A - Airflow too low

Alarm conditions:

19A - Supply airflow does not reach 30% of setpoint.

20A - Exhaust airflow does not reach 30% of setpoint.

Possible causes:

  1. Fan failure,
  2. Too high resistance in duct system,
  3. Airflow is measured incorrectly,
  4. Controller failure

Troubleshooting:

 

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