Emerson Liebert DS Precision Cooling System 28-105kW Manuel D’Utilisation
Product Description
1
1.0
P
RODUCT
D
ESCRIPTION
1.1
General Product Information
The Liebert Air Economizer is an option for Liebert DS downflow units, Liebert CW chilled water
downflow and Liebert Challenger 3000 downflow units. The Liebert Air Economizer uses cool outdoor
air in mild climates to condition indoor spaces. It is functional only on cooling units with Liebert
iCOM
®
controls that have been factory-wired and configured to accommodate the Liebert Air
Economizer.
The Liebert Air Economizer is supplied with electrical wiring for connection to the cooling unit,
The Liebert Air Economizer is supplied with electrical wiring for connection to the cooling unit,
outdoor air sensors, return air sensors and a temperature-and-humidity-sensing unit.
Special firmware is loaded into the primary cooling unit at the factory to permit the primary cooling
Special firmware is loaded into the primary cooling unit at the factory to permit the primary cooling
unit to control the Liebert Air Economizer.
1.1.1 Customer-Supplied Equipment and Ductwork
Installation and operation requires outside-air entry ductwork with louvers, screening and filtration
to prevent intrusion of precipitation, particulates, vermin and unauthorized entry (see Figure 1).
Proper installation also requires a customer-provided powered relief-air discharge to rid the structure
Proper installation also requires a customer-provided powered relief-air discharge to rid the structure
of the outside air drawn in for cooling. The relief-air discharge must be equivalent to the airflow of the
total of all cooling systems equipped with the Liebert Air Economizer.
A flange is provided to attach the Liebert Air Economizer to the outdoor air duct Figures 2, 3 and 4.
A flange is provided to attach the Liebert Air Economizer to the outdoor air duct Figures 2, 3 and 4.
NOTE
When upgrading the firmware for the primary cooling unit, either a Liebert DS downflow unit
When upgrading the firmware for the primary cooling unit, either a Liebert DS downflow unit
or Liebert CW downflow unit, ensure that the new firmware includes the Liebert Air
Economizer controls. If in doubt, contact the factory.