Hot Water System – Boiler Status is ON with pumps OFF

Objective/ Method/Outcome

Objective: Determines if primary pumps are inactive while boiler is active.

Method: Compares boiler operation with primary pump(s) operation and generates an insight when a mismatch occurs for greater than the defined threshold. Avoidable Cost and Potential savings are determined based on an hourly cost of faulty operation.

Outcome: This rule generates an insight.

Description

Reference: ASHRAE Guideline 36-5.21.6.3 This rule determines if boiler is overrunning when associated primary pumps are OFF. This rule is applied for boiler. This rule is part of the CopperTree Standard rule-set.

Default Priority

High

Diagnosis

1. Inspect the equipment to see if it has been overridden manually.

2. Ensure that interfacing relays are working.

3. Verify that the status sensor is calibrated.

Message

Boiler status in ON with associated pumps OFF. Please check status sensor and equipment.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

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. – Cost per Hour [$]: 0

Const. – Weeks of Operation: 26