Return fan command and status signals are mismatched

Objective/Method/Outcome

Objective: Determines if the return signals of the return 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: Trigger 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

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

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Logic

Logic used to determine if the return fan command and status signals are mismatching

Inputs

InputUnitTagsDescription
CommandReturn Air Fan CommandThe recorded return air fan command
StatusReturn Air Fan StatusThe recorded return air fan status
Acceptable Hours of Fault per WeekThe allowable hours of fault, beyond which an insight is triggered
Cost per Hour $The cost per hour of fault
Days of operation annually The yearly days of operation to project annual potential savings