Supply fan command and status signals are mismatched

Objective/Method/Outcome

Objective: Determines if the return signals 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

Supply 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 the supply fan command and status are mismatched

Inputs

Input Unit Tags Description
Command Discharge Air Fan Command The recorded supply fan command
Status Discharge Air Fan Status The recorded supply fan status
Acceptable Hours of Fault per Week The allowable hours of fault beyond which an insight is triggered
Cost per Hour $ The cost of fault per hour
Days of operation annually The days of operation of the fan per year used to project potential savings