Hot Water System – Boiler status and isolation valve position are mismatched

Objective/ Method/Outcome

Objective: Determines if the boiler status and isolation valve status signals are matching.

Method: Compares the boiler 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 Costs and Potential savings are determined based on the hourly cost of faulty operation.

Outcome: This rule generates an insight.

Description

This rule determines if the isolation valve operation is in sync with the boiler 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

Boiler status and isolation valve position are mismatched. Please investigate hot water system.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Inputs

Input	Unit	Tags	Description
Boiler Status		Boiler Status, Boiler 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 “Boiler 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