Vertiv Liebert XD Series, System Design Manual

Page: 28 / 200

Figure 3.3 Liebert XDH placement (top view)
3.8 Liebert XDO Placement
3.8.1 Determining Spacing of Liebert XDOs in an Aisle
Liebert XDO modules should be placed in rows directly above the cold aisles of a room for optimum
cooling. Each Liebert XDO serves an area equal in width to the cold aisle spacing, typically 12 to 16 feet (3.7
to 4.9m). The length of the area served includes any space between Liebert XDO modules in a row.
Depending on the cooling capacity to be achieved, spacing between Liebert XDO modules in a row may
vary from zero to as much as 6 feet (1.8m). When the spacing increases to more than 6 feet (1.8m), overall
performance of the system may be negatively affected and gaps in cooling may occur.
Install one Liebert XDO at the end of each aisle being cooled and to space the remainder between these
end modules as shown in Figure 3.4 on the facing page. This layout will block the incursion of hot air
around the side of the end cabinets. Allowing space between the Liebert XDO groups facilitates
maintenance by allowing access to the overhead space.
Vertiv | Liebert® Xtreme Density™ System Design Manual | 28