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1.0 PRODUCT DESCRIPTION
1.1 General Product Information
1.1.1 Product/System Description
The Liebert XDC
™
(eXtreme Density Chiller) is self-contained refrigeration distribution unit
designed to cool rooms with high heat producing equipment. There are two distinct circuits, each uti-
lizing different refrigerants and mechanical parts. The R-134a circuit is the “pumped” circuit contain-
ing redundant circulating pumps, a brazed plate heat exchanger along with valves and piping. The
R-407c circuit is the dual direct expansion circuit containing scroll compressors, expansion valves,
brazed plate heat exchanger, and piping. Heat removal is accomplished by using condensers con-
nected to the dual direct expansion circuit. Heat rejection is available in two options: an outdoor air
cooled condenser and a water/glycol condenser. See Figure 1 below.
The Liebert XDC monitors room conditions and prevents coil condensation by maintaining the coolant
being pumped to the cooling modules at a temperature above the room dew point. All functions, such
as temperature control, switching pumps (if necessary), etc., are automatic.
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. Consult factory for any loading below this recommendation.
See Table 25 for the Liebert XDC160 rated cooling capacity.
Figure 1 Liebert XDC components
1.2 Equipment Inspection
When the unit is delivered, inspect all items for visible and concealed damage. Damage should be
immediately reported to the carrier and a damage claim filed with a copy sent to Liebert or to your
sales representative.
1.3 Equipment Handling
!
WARNING
Risk of unit falling over. Can cause death, injury and equipment damage.
The Liebert XDC is top-heavy. Use extreme caution and care when moving and installing this
unit.
Liebert XDC
Compressor
Liebert XD Cooling Modules
Heat Exchanger
Receiver
Pumps
Condenser
Unit