Cooling valve remains open while unit is inactive

Objective/Method/Outcome

Objective: Determines if the cooling valve is open when the unit is not operational

Method: The position of the valve is used to determine if the cooling unit is open. If the status of the unit is off while the position of the valve is open, for longer than the acceptable amount of time, an insight is triggered.

Outcome: Triggers an insight if the cooling valve is open while the unit is inactive.

Description

Monitors cooling valve position and unit status, ensuring that valves remain closed while unit is not running. This is likely a control fault, and not an energy fault if there is no flow to the coil.

This rule is part of the CopperTree Standard ruleset.

Default Priority

Medium 

Diagnosis

Review valve programming.

Message

Cooling valve remains open while unit is inactive.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Logic

Logic for determining if cooling valve remains open while unit is inactive

Inputs

Input Unit Tags Description
Cooling Valve  Discharge Air Cooling Command The status of the cooling valve
Threshold – Weekly Hours of Faulty Operation The minimum hours of fault to trigger insight
SF Status  Discharge Air Fan Command, Discharge Air Fan Status The status of the supply fan