Objective/ Method/Outcome
Objective: Determines if the Energy Recovery Wheel Bypass Damper is open while the Energy Wheel is running, or closed while the Energy Wheel is not running.
Method: Compares the Energy Wheel Fan Status to the Bypass Damper Position while the AHU is active. If the Energy Wheel Fan Status is active while the Bypass Damper Position is open or the Energy Wheel Fan Status is inactive while the Bypass Damper Position is closed, the hours of faulty operation are calculated.
Outcome: This rule generates an insight if the Weekly Hours of Faulty Operation exceeds the acceptable weekly threshold.
Description
Reference: ASHRAE90.1-6.5.6.1.2
This rule monitors 2 faulty operations:
1. Energy Recovery Wheel Bypass Damper is open when Energy Wheel is running, resulting in unnecessary cooling or heating.
2. Energy Recovery Wheel Bypass Damper is closed when Energy Wheel is not running, resulting in unnecessary fan power consumption.
This rule is part of the CopperTree Standard rule-set. (Aliased Celsius / Aliased Fahrenheit)
Default Priority
Medium
Diagnosis
1. Inspect the equipment to see if it has been overridden manually.
2. Ensure that interfacing relays are working.
3. Verify that the status sensor is calibrated.
Message
Energy recovery bypass damper is operating incorrectly.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Notes
1. Expected values for “Energy Wheel Fan Status or Command” and “AHU Status” inputs are “0” or “1”.
Default Values:
Const. – Threshold – Acceptable Weekly Hours of Faulty Operation [hrs]: 4
CTLs:
ER Bypass Damper Incorrect Operation – Weekly Hours of Faulty Operation (KPI)
ER Bypass Damper Incorrect Operation – Hours of Faulty Operation (CUSUM)
