Vertiv Liebert XD Series, System Design Manual

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1.7 Liebert XDR—Rear Cooling Module
The Liebert XDR is a cooling system for high-density heat loads that mounts on the rear of a 24" (600mm)
x 42U rack (consult the factory for other rack sizes) and maintains access to the back of the server rack.
Room air is drawn in through the front of the rack and picks up heat from the servers. The coil captures
that heat, cooling the air, which is expelled through the rear of the rack.
The Liebert XDR relies on the rack equipment’s fans to move air across the microchannel coil. Captured
heat is carried away through pumped R-134a refrigerant supplied by either a Liebert XDPor Liebert XDC.
The Liebert XDR is available in hard-piped configurations or with Liebert XD Flex Pipes with
quick-connect couplings (one-shot or removable) for easy connection to the header system. The Liebert
XDR and flexible pipes are also available pre-charged with R134a refrigerant. This option requires the one-
shot connections.
Figure 1.7 Liebert XDR on cabinet
1.8 Liebert XDV—Vertical, Above-Cabinet Cooling Module
The Liebert XDV cooling system is designed to be attached to the top of a computer cabinet or rack
containing heat-dissipating equipment. Two fans draw hot air exhausted from the equipment or from the
hot aisle, pass it through a cooling coil and discharge cool air back down to the cold aisle, where the
equipment's air intake is located.
The Liebert XDV comes from the factory ready to draw heated air through a perforated grille on the back
of the module. The Liebert XDV is easily modified to draw hot air through the bottom of the module,
should that cooling method be better suited to your application.
Vertiv | Liebert® Xtreme Density™ System Design Manual | 13