Guide Specifications—Chilled Water Environmental Control System
Liebert
®
CW
™
System Design Manual 114
3.8 VIRTUAL BACK-DRAFT DAMPER
Liebert iCOM
®
shall allow the use of a virtual back-draft damper, eliminating the need for a mechanical
damper. This shall allow the fans to spin slowly (15% or less) to act as a damper.
3.9 SYSTEM AUTO RESTART
The auto restart feature shall automatically restart the system after a power failure. Time delay shall be
programmable. An optional capacitive buffer may be provided for continuous control operation through a
power failure.
3.10 WIRED SUPPLY SENSOR
Each Liebert iCOM shall have one factory-supplied and connected supply air sensor that may be used as
a controlling sensor or reference. When multiple sensors are applied for control purposes, the user shall be
able to control based on a maximum or average temperature reading.
3.11 SEQUENTIAL LOAD ACTIVATION
On initial startup or restart after power failure, each operational load shall be sequenced with a minimum of
one-second delay to minimize total inrush current.
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