Emerson Xtreme Density Manuel D’Utilisation

Liebert XDV units should be placed on top of the cabinets that generate the greatest amount of heat. 

If heat loads are dispersed evenly throughout the room, the Liebert XDV modules may be spread out 

accordingly.
The Liebert XDV must be placed toward the front of the equipment cabinet, so that its front bottom 

edge is flush with the front top edge of the cabinet. Placing the unit farther back on the top of the unit 

will restrict airflow into the cold aisle. Placing the unit farther to the front will decrease the amount 

of hot air drawn into the unit.

Both of the Liebert XDV’s power cords should be connected to power sources. If only one power source 

is available, then only the power cord labeled “SECONDARY” should be connected to the power 

source.
Piping for the Liebert XDV is routed upward to the main return and supply pipes to and from the Lie-

bert XDP/Liebert XDC.
Table 4, below, may be used to determine the correct number of Liebert XDV modules.
Table 4

Total heat load in the room, kW

A

Reserve capacity needed

(10% to 25% of A is 

recommended)

B

C

Required cooling capacity, kW = A + B 

Existing/planned Liebert 

Deluxe/DS sensible capacity, kW

D

E

Required Liebert XD system cooling capacity, kW = C – D

F

Number of Liebert XDV10 modules required = E ÷ 10, rounded up (60Hz)

= E ÷ 8, rounded up (50Hz)

G

Number of Liebert XDP/Liebert XDC modules required = F ÷ 16, rounded 

up (60Hz and 50Hz)

Room area, square feet

H

I

Area served by each Liebert XDV10 = H ÷ F

L

Required Liebert XD system cooling density = E x 1000 ÷ H

OK if under 580 for 12-foot cold aisle spacing

OK if under 435 for 16-foot cold aisle spacing

Otherwise, additional Liebert Deluxe or Liebert DS unit capacity is 

needed.

X

X