Hot Water Return Temperature sensor may be faulty

Objective/Method/Outcome

Objective: Determines if the Hot Water Return 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.

Applicable System

HWS

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 sensor is broken

Message

Hot water return temperature sensor is reading outside reasonable range or is stuck on one value.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Default Priority

Low

Logic

Logic flow for determining hot water return temperature sensor was faulty

Inputs

Input Unit Tags Description
Hot Water Return Temperature °C Room Temperature Hot water return temperature records
Temperature Low Limit  °C The predetermined low limit for temperature
Temperature High Limit °C The predetermined high limit of temperature
Weekly Insight Threshold hours This is the minimum number of hours the system should be at fault to trigger insight

Notes

Default Thresholds:

  • Temperature Low Limit: 15°C or 59°F
  • Temperature High Limit : 85°C or 185°F
  • Weekly Insight Threshold [hours]: 120 hours