Objective/Method/Outcome
Objective: Determines if the Supply Air Temperature is above setpoint when Primary Air System is heating
Method: Compares the supply air temperature to the setpoint to see if it was above the acceptable range while the heating valve is open.
Outcome: Triggers an insight.
Description
Monitors heating valves within primary air system units, ensuring they are closed when SAT is sufficiently above setpoint. This rule is part of the CopperTree Standard rule-set.
Default Priority
Low
Diagnosis
- Heating may be manually overridden.
- Review control loop tuning.
- Temperature sensor may need calibration.
Message
Unit is heating while SAT is sufficiently above setpoint.
Rule Template
Insight Trigger: Energy
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| SAT | ° | Discharge Air Temperature | The recorded SAT |
| Valve Open Threshold | The minimum position of the valve to determine it to be open | ||
| Fan Temperature Gain | ° | ||
| Temperature Threshold | ° | The minimum temperature that can trigger an insight | |
| Threshold – Hours of Faulty Operation | hr | The minimum hours of faulty operation that can trigger an insight | |
| Fan Status | Discharge Air Fan Status, Discharge Air Fan Command | The recorded status of the fan | |
| HCV | Discharge Air Heating Command | The recorded HCV | |
| MAT | ° | Mixed Air Temperature | The recorded MAT |
Notes
Default Values:
- Supply Air Temperature Deadband [°]: 2
- Threshold – Weekly Hours of Faulty Operation: 8
