Vertiv Liebert XDC User Manual

2 PRODUCT DESCRIPTION
2.1 General Product Information
2.1.1 Product/System Description
The Liebert XDC
™
(X-treme Density Chiller) is a self-contained refrigeration distribution unit designed to
cool rooms with high heat producing equipment. There are two distinct circuits, each utilizing different
refrigerants and mechanical parts. The R-134a circuit is the “pumped” circuit containing 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 connected 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 2.1 below below.
The Liebert XDC monitors room conditions and prevents coil condensation by maintaining the refrigerant
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 64kW. Loading below this value can
unfavorably affect system operation.
See Table 11.1 on page127 for the Liebert XDC160 rated cooling capacity.
Figure 2.1 Liebert XDC components
Vertiv | Liebert® XDC™ User Manual | 9

Vertiv Liebert XDC Specifications

General

Brand	Vertiv
Model	Liebert XDC
Category	Freezer
Language	English