Technical Specifications

System Description
9
1.9 Liebert XDC—Refrigerant Chiller
The Liebert XDC is an indoor chiller that connects directly to the Liebert XD cooling modules and
provides refrigerant circulation and control. The Liebert XDC keeps the refrigerant temperature
above the room dew point at the sensors. The Liebert XDC contains a refrigerant to refrigerant heat
exchanger along with two tandem scroll compressor circuits. This allows heat rejection to the outdoor
ambient air by using either the air-cooled condensers or water/glycol shell-and-tube condensers much
like a standard computer room air conditioning unit. The Liebert XDC employs two remote sensors
(for redundancy) to determine the temperature and humidity in the air and instantly adjusts
refrigerant supply temperature to compensate for changing conditions.
The Liebert XDC uses the Liebert iCOM
®
. This advanced control enables the user to monitor
essentially all aspects of the Liebert XD Precision Cooling system, from operating status to
maintenance
1.9.1 Liebert XDC Minimum Load
The Liebert XDC’s minimum recommended operating load is 40% of system nominal capacity. For
example, a Liebert XDC160 60Hz system’s minimum load would be 64 kW. Loading below this value
can unfavorably affect system operation.
Figure 10 Liebert XD Chiller