Mixed Air Temperature sensor may be faulty

Objective/Method/Outcome

Objective: Determines if the Mixed Air Temperature sensor is faulty.

Method: Checks if the sensor is faulty by monitoring the changes in the value of the sensor or if the temperature is out of range for more than the acceptable amount of time.

Outcome: Triggers an insight when it determines the sensor is faulty.

Description

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

Diagnosis

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

Message

The mixed temperature 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

Default Priority

Low

Logic

Logic flow for determining mixed air temperature sensor is faulty

Inputs

InputUnitTagsDescription
Mixed Air Temperature°CRoom TemperatureThe recorded Mixed air temperature
Temperature Low Limit °CThe predetermined low limit for temperature
Temperature High Limit°CThe predetermined high limit of temperature
Weekly Insight ThresholdhoursThis is the minimum number of hours the system should be at fault to trigger insight

Notes

Default Thresholds:

  • Temperature Low Limit: 0°C or 32°F
  • Temperature High Limit: 40°C or 100°F
  • Weekly Insight Threshold [hours]: 120 hours