Objective/Method/Outcome
Objective: Determines if the VAV damper is consistently 100% open during operational hours.
Method: Compares the VAV damper command to the error threshold to find the hours during which the valve is open at 100%. This is compared to the hours of operation to determine if the damper is consistently at full capacity and find the avoidable cost of running the system at 100%.
Outcome: The rule triggers an insight and calculates potential savings.
Applicable System
VAV
Description
Damper control: Check for VAV dampers constantly at 100%.
This rule is part of the CopperTree Standard rule-set.
Default Priority
Medium
Diagnosis
- Verify damper control – could be manually overridden.
- Verify if the damper is stuck open.
Message
VAV damper is 100% open for more than 95% of the total weekly occupied hours. Please review damper operation.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Occupancy | Room Occupied, Discharge Fan Command, Discharge Fan Status | ||
| Threshold – Acceptable Weekly Percent | % | The weekly acceptable percentage of time the VAV can operate at 100% | |
| Threshold – Damper Fully Open | % | The minimum damper position that can trigger insight | |
| Damper Position | Discharge Air Volume Damper, Discharge Air Volume Damper Position | The position of the damper |
Notes
Default Inputs:
- Threshold – Acceptable Weekly Percent [%]: 95%
- Threshold – Damper Fully Open [%]: 98%
