Emerson Liebert DS Precision Cooling System 28-105kW Manuel D’Utilisation
Operation
14
4.0
O
PERATION
Liebert cooling units control the Liebert Air Economizer with the analog outputs of the Liebert iCOM
control. The Liebert iCOM can be used with a Liebert Air Economizer or with a previously installed
Liebert Air Economizer equipped with 0-10VDC or 2-10VDC dampers. The Liebert iCOM is capable of
driving two independent damper motors or can be set up through the software to output a single
signal where the dampers are inversely driven.
The primary cooling unit responds to sensors that monitor the temperature and humidity of the
The primary cooling unit responds to sensors that monitor the temperature and humidity of the
outdoor air, return air and supply air. If outdoor conditions are within the tolerances set, the primary
cooling unit opens the Liebert Air Economizer’s dampers varying amounts to use outdoor air for
cooling. When outdoor conditions are too warm or humid for cooling, the primary cooling unit closes
the Liebert Air Economizer’s dampers, taking it out of the cooling process.
NOTICE
Risk of high or low humidity. Can cause environmental conditions that are outside equipment
requirements.
While the Liebert Air Economizer is operating, the primary cooling unit’s humidification and
While the Liebert Air Economizer is operating, the primary cooling unit’s humidification and
dehumidification are inhibited. If humidity level is important to operational requirements, it
must be controlled by other methods during operation of the Liebert Air Economizer. While
the primary cooling unit is cooling without the Liebert Air Economizer, the primary cooling
unit will control humidity levels according to its setpoints.
NOTICE
Risk of freezing temperatures. Can cause equipment and property damage.
Low outdoor temperatures can produce freezing conditions that adversely affect cooling
Low outdoor temperatures can produce freezing conditions that adversely affect cooling
systems employing water, particularly when the water is not moving through the pipes. When
cooling system water is not moving, frozen waterlines, burst coils and water damage are
possible. The outside damper must be set so that it is fully closed when freezing temperatures
are possible and the cooling system is not operating (see 4.2.4 - Disable the Liebert Air
Economizer). This can be achieved by either connecting a freeze stat that interrupts the
economizer signal or by wiring a freeze stat directly into the Liebert iCOM’s customer input.
The risk of freezing is increased unless the proper amount of glycol is added to the chilled
The risk of freezing is increased unless the proper amount of glycol is added to the chilled
water unit loops.
NOTICE
Risk of infiltration of odors, smoke and particulates from outside air. Can cause
environmental conditions that are outside equipment requirements.
The Liebert Air Economizer does not remove odors, smoke, gases or particulates from the
The Liebert Air Economizer does not remove odors, smoke, gases or particulates from the
outside air used for cooling. These must be controlled by other methods.