Vertiv Liebert XD Series, System Design Manual, Page: 12 / 200

A Liebert XDO smart module will allow remote monitoring, shutdown, fan failure alarms, condensate
detection and automatically cycling the fan On and Off as the heat load requires. The Liebert
XDP/Liebert XDC monitors room conditions and prevents coil condensation by maintaining the
temperature of the refrigerant pumped to the Liebert XDOs above the room dew point.
The Liebert XDO is available for hard-piped configurations or with Liebert XD Flex Pipes with quick-
connect couplings (one-shot) for easy connection to the header system. When the pre-charged option is
selected, the Liebert XDO and the one-shot flexible pipes contain R134a.
NOTE: The Liebert XDO is the most sensitive module to system load. The Liebert XDO’s air intake and
the discharge are not separated by a rack. This can lead to the Liebert XDO pulling in cold air rather
than hot air. The Liebert XDP and Liebert XDC minimum loads must be met to prevent this from
occurring.
Figure 1.6 Suspended Liebert XDO modules in hot aisle-cold aisle arrangement
Vertiv | Liebert® Xtreme Density™ System Design Manual | 12