User manual

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Operation

• The valve pulse and cooling filter timer can be adjusted to prevent oscillating around the supply

setpoint and still allow for rapid valve adjustments to compensate for heat load changes. Contact

your local Liebert service personnel for adjustments.

• Return Compensation begins to increase the supply air setpoint when the return air decreases

below the return air setpoint.

Example

Setting the return compensation value in the Service, Setpoints menu to 5°F (2.7°C) will

increase the supply setpoint from 50°F to 55°F (10°C to12.8°C) when the return temperature is

at the low limit of the proportional band.

3.8 Liebert Smart Aisle Control

Liebert Smart Aisle Control allows the Liebert iCOM to manage airflow and cooling capacity

independently. This control mode allows the unit to adjust the airflow based on the cold aisle

temperature and the cooling output based on the discharge air temperature.

The Liebert Smart Aisle Control focuses on the inlet temperature to the racks. The Liebert Smart

Aisle Control also manages each component independently to manage the energy usage to provide the

correct amount of cooling. As the environment changes, the Liebert iCOM will adjust the airflow and

heat rejection based on the sensor readings at the discharge air temperature of the unit and the cold

aisle temperature.

The Liebert Smart Aisle Control also will automatically adjust cooling based on the configuration of

the cold aisle. The control can automatically adjust fan speed and cooling capacity when the cold aisle

configuration is changed. This includes no containment, end containment and total containment of

the cold aisle.

Currently, the Liebert Smart Aisle Control is limited to chilled water units with variable speed fans

and one cold aisle sensor per unit.

Figure 26 Equipment layout for Liebert Smart Aisle Control

3.8.1 Hardware Setup

The Liebert Smart Aisle Control requires:

• A temperature/humidity sensor in the cold aisle and connected to the Liebert iCOM via CAN bus.

This can be done by:

• Moving the return temperature sensor from the cooling unit to the cold aisle with a longer

CAN Bus cable

OR BY

• Obtaining a remote temperature sensor and addressing it to operate as the return

temperature sensor.

• An additional supply temperature sensor placed under the raised floor.

CANbus

Supply Sensor (Cooling Capacity)

Server Rack Server Rack

Temp/Hum Sensor

(Fanspeed Control)

iCOM

Opening

Water Valve

Speed Control

CRAC Unit