Objective/ Method/Outcome
Objective: Determines if the chiller condenser water return temperature (CWRT) has deviated too far from the common CWRT.
Method: Compares the CWRT and common CWRT 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 deviation between the active chiller condenser water return temperature and the common condenser water return temperature is too high. This rule is part of the CopperTree Standard rule-set.
Default Priority
Low
Diagnosis
A condenser water return temperature sensor is out of calibration
Message
Deviation between the active chiller CWRT and the common CWRT 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
