Chilled command and status signals are mismatched

Objective/Method/Outcome

Objective: Determines if the chilled command and signal of the supply air fan are matching

Method: Compares the Command and Status to check if the command and status signals are active at the same time, to find out the hours of fault.

Outcome: Triggers an insight if the hours of fault are greater than the acceptable hours of fault.

Description

Compares the status and command signals to determine if there is a mismatch.

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 command-status signals do not match. Please investigate unit control.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Logic

Logic to determine if chiller command and signals are mismatched

Inputs

InputUnitTagsDescription
CommandChiller CommandThe recorded chiller command
Status Chiller StatusThe recorded chiller status
Acceptable Hours of Fault per WeekThe allowable weekly hours of fault, beyond which an insight is triggered
Cost per Hour $The cost of fault per hour
Days of operation annuallyThe days of operation yearly used to project annual potential savings