Objective/ Method/Outcome
Objective: Determines if the chilled water supply temperature (CHWST) has deviated too far from the common CHWST.
Method: Compares the CHWST and common CHWST to the defined error threshold and generates an insight when this fault occurs for greater than the defined daily threshold.
Outcome: This rule generates an insight.
Description
Reference: ASHRAE Guideline 36-5.20.18.6 This rule determines if the deviation between the active chiller chilled water supply temperature and the common chilled water supply temperature is too high. This rule is part of the CopperTree Standard rule-set.
Default Priority
Low
Diagnosis
A chilled water supply temperature sensor is out of calibration
Message
Deviation between the active chiller CHWST and the common CHWST is too high.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Notes
1. Expected values for “Chiller Status” inputs are “0” or “1”.
Default Values:
Const. – Temperature error threshold for chilled water temperature sensors [°C]: 1°C
Const. – Daily Faulty Hours Threshold [hours]: 2 hours
