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Designing a Liebert XD Solution
16
3.6.2 Determining Vertical Placement of Liebert XDOs Above the Cold Aisle
In the maximum density configuration, Emerson recommends placing the Liebert XDOs between 18
and 24 inches (457-609mm) above the equipment cabinets. In some cases where the required density
is less, the front-to-rear spacing of Liebert XDOs in a row will be increased. To ensure coverage of the
wider spaces between the Liebert XDO units, the vertical distance between the cabinets and the Lie-
bert XDOs should be increased. However, the recommended maximum height of the Liebert XDO
above the cabinets is 30 inches (762mm). See Figures 15.
Figure 15 Liebert XDO spacing—horizontal and vertical
Front-to-rear spacing of
pairs of XDO modules
XDO height above
equipment to be cooled
Heat-Generating Critical Equipment
Pairs of XDO modules
above critical equipment
Liebert recom-
mends install-
ing one Liebert
XDO at the end
of each aisle
being cooled
and to space
the remainder
between these
“end units” in
pairs. This lay-
out will block
the incursion of
hot air around
the side of the
end cabinets.