Airflow sensor may be faulty

Objective/ Method/Outcome

Objective: Determines if the airflow sensor is faulty.

Method: Compares the recorded airflow to the 24-hour maximum and minimum to find if the airflow sensor is stuck on the same value or if the sensor constantly outside the acceptable range.

Outcome: This rule generates an insight.

Description

Sensor validation rule: Check for unreliable readings in range and quality. This rule is part of the CopperTree Standard rule-set.

Default Priority

Low

Diagnosis

  1. Verify sensor exists.
  2. Verify sensor has power.
  3. Verify reading in BMS.
  4. Replace if the sensor is broken.

Message

Airflow sensor is reading outside reasonable range or is stuck on one value. This may negatively impact comfort or energy efficiency.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Logic

Logic for determining if Airflow sensor is faulty

Inputs

InputUnitTagsDescription
AirflowCFMDischarge Air CFMThe recorded airflow
Flow Low LimitCFMThe lower limit of the acceptable flow range
Flow High LimitCFMThe upper limit of acceptable flow range
Weekly Insight ThresholdhoursThe minimum hours of fault that can trigger an insight

Notes

Default Thresholds:

  • Flow Low Limit [CFM]: 0
  • Flow High Limit [CFM]: 3000
  • Weekly Insight Threshold [hours]: 120 hours
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