Objective/ Method/Outcome
Objective: Determines if the hydronic loop flow is too high when all associated pumps are inactive.
Method: Compares the hydronic flow to the defined flow threshold and determines a fault when the threshold is exceeded while the associated pump status signals are inactive. An insight is generated when this occurs for greater than the defined daily threshold.
Outcome: This rule generates an insight.
Description
Reference: ASHRAE Guideline 36-5.21.11.6/ASHRAE Guideline 36-5.20.18.6 This rule determines if loop flow is a reasonable value when associated pumps are off. This rule is part of the CopperTree Standard rule-set.
Default Priority
Low
Diagnosis
Verify flow meter operation.
Message
Water flow is too high with the associated pumps off.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Associated Pump 1-4 Status | Chilled Water Pump Status, Hot Water Pump Status | ||
| Flow | LPS, GPM | Chilled Water Supply LPS, Hot Water Supply LPS, Chilled Water Supply GPM, Hot Water Supply GPM | |
| Acceptable Time Outside Range per Day | Hours | The minimum hours of fault that can trigger an insight | |
| Minimum Flow Threshold | GPM | The defined threshold to determine faulty operation |
Notes
1. Only one “Flowrate”, [LPS] or [GPM] is needed.
2. Expected values for “Pump Status” inputs are “0” or “1”.
3. The input(s) that is(are) not used should be set to “0”.
Default Values:
Const. – Acceptable Time Outside Range per Day [hours]: 2
Const. – Minimum Flow Threshold [GPM]: 20
