Specifications

System Description
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1.9 Liebert XDC—Refrigerant Chiller
The Liebert XDC is an indoor chiller that connects directly to the Liebert XD cooling modules and pro-
vides 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 refriger-
ant supply temperature to compensate for changing conditions.
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 unit