Objective/ Method/Outcome
Objective: Determines if the chiller status and isolation valve status signals are matching.
Method: Compares the chiller status and isolation valve status signals to check if their activity matches and generates an insight when a mismatch occurs for greater than the defined daily threshold. Avoidable Cost and Potential savings are determined based on an hourly cost of faulty operation.
Outcome: This rule generates an insight.
Description
This rule determines if isolation valve operation is synchronized with chiller status. This rule is part of the CopperTree Standard rule-set.
Default Priority
High
Diagnosis
1. Check if the equipment is manually overridden.
2. Check interfacing relays.
3. Check status sensors.
Message
Chiller status and isolation valve position are mismatched. Please investigate chilled water system.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Chiller Status | Chiller Status, Chiller Command | ||
| Isolation Valve Status | Valve Command, Valve Status | ||
| Threshold – Daily Hours of Faulty Operation | Hours | The minimum hours of fault that can trigger an insight | |
| Weeks of Operation | The annual weeks of operation | ||
| Cost per Hour | $ | The defined hourly cost of faulty operation |
Notes
1. Expected values for “Chiller Status” inputs are “0” or “1”.
2. Expected values for “Isolation Valve Status” inputs are “0” or “1”.
Default Values:
Const. – Threshold – Daily Hours of Faulty Operation [Hours]: 2
Const. – Cost per Hour [$]: 0 Const. – Weeks of Operation: 26
