Emerson Xtreme Density Manuel D’Utilisation

Designing a Liebert XD Solution

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.