Objective/ Method/Outcome
Objective: Determines if a sequencing error exists between boilers and primary pumps.
Method: Compares the total number of primary pumps operating to the total number of boilers operating for up to 3 primary pumps and 3 boilers. An insight is generated when a mismatch occurs for greater than the defined daily threshold. Avoidable Cost and Potential Savings are determined by calculating unnecessary pump energy consumption.
Outcome: This rule generates an insight.
Description
Reference: ASHRAE Guideline 36-5.21.6.10 This rule determines if the number of operating pumps matches the number of running boilers. This rule is applicable for a group of boilers and associated pumps. This rule is part of the CopperTree Standard rule-set.
Default Priority
High
Diagnosis
1. Check whether the pumps and boilers are running in auto or manual mode.
2. Inspect the MCC panel of the concerned pumps and the starter panel of the boilers.
3. Ensure the relay panels within the concerned DDC are functioning properly.
Message
Incorrect staging sequence between boilers and primary pumps. Review and modify the sequence of operations.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Primary Hot Water Pump 1-3 Status | Hot Water Pump Status, Hot Water Pump Command | ||
| Boiler 1-3 Status | Boiler Status, Boiler Command | ||
| Threshold – Daily Hours of Faulty Operation | Hours | The minimum hours of fault that can trigger an insight | |
| Pump Power Rating | HP | The manufacturer defined rating | |
| Pump Energy Rate | $/kWh | The cost of pump operation per kWh | |
| Weeks of Operation | The annual weeks of operation |
Notes
1. Expected values for “Pump Status” inputs are “0” or “1”.
2. Expected values for “Boiler Status” inputs are “0” or “1”.
3. The input(s) that is(are) not used should be set to “0”.
Default Values:
Const. – Threshold – Daily Hours of Faulty Operation [Hours]: 2
Const. – Pump Rating [HP]: 10
Const. – Electricity Rate [$/kWh]: 0.1 Const. – Weeks of Operation: 26
