Emerson Liebert iCOM Manual De Usuario

Enable the corresponding sensors to be included in the aggregate temperature measurement. Set the 

aggregation method to average or maximum. The aggregated temperature will be displayed at the 

bottom of the screen.

• Supply Control: When the supply sensor is set to Control, the unit will control the amount of 

cooling / heating being provided based on maintaining the discharge air temperature. The return 

air sensor may still be used to control fan, humidity or as temperature/humidity reference of the 

room. 

• Supply Limit: The supply limit can be enabled only when the unit’s temperature control sensor 

is set to either Remote Sensor or Return Sensor. The unit may be set up with the supply air 

sensor to maintain a minimum air temperature under a raised floor to help prevent condensation. 

To avoid supply temperatures that are too low, the supply limit can influence the opening of 

three-point or analog actuators, or compressor capacity. The control compares the deviation from 

the return air setpoint and the supply limit setpoint and calculates the output to the actuator 

from the smaller deviation.

When the supply air sensor is set for Temperature control, additional Supply Air configuration 

parameters (valve pulse, cooling filters and return compensation) can be used to enhance the 

supply air control.

• Valve Pulse and Cooling Filter Timer: The valve pulse and cooling filter timer can be 

adjusted to prevent oscillation around the supply setpoint and still allow for rapid cooling capacity 

adjustments to compensate for heat load changes. Contact your local Emerson Network Power 

Liebert Services personnel for adjustments.

The Liebert iCOM Optimized Aisle Control has been developed to take advantage of the variable fan 

speed (EC or VFD Fans) and variable capacity (Chilled Water, 4-Step and Digital Scroll) components 

that are available on some units. This new control scheme uses this variable capacity technology and 

applies it to ensure that the inlet air temperature to the server is maintained while providing the 

greatest amount of energy savings. Maintaining the rack inlet air temperature ensures that the IT 

equipment operates trouble free and keeps the server fans from ramping up from their minimum 

speed.
Each Liebert cooling unit is equipped with a Liebert iCOM controller that has the ability to collect 

and control a supply (Discharge) air temperature sensor, a return temperature and humidity sensor 

and up to 20 rack temperature sensors. The Liebert iCOM Optimized Aisle control utilizes each of 

these sensors to determine how to adjust the cooling, heating, humidification and dehumidification 

capacity of the unit.
All floor mount cooling units equipped with Liebert iCOM can communicate with each other through 

standard Ethernet connectivity. This communication between the units allows coordination of cooling 

capacity, zoned air flow distribution, fail over protection and different modes of standby operation. To 

reach the full benefit of the Liebert iCOM Optimized Aisle Control, the units must have this network 

connected.
Upgrades are available for most Liebert cooling units that are not equipped with the Liebert iCOM or 

with a variable speed fan. Contact local Emerson representative for additional information.