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2.0 PRODUCT DESCRIPTION
Congratulations on purchasing a Liebert XDF. The XDF is an integrated equipment cabinet with
built-in cooling and intelligent control to protect mission-critical enterprise systems from extreme
heat. The XDF provides an organized, secure, controlled environment for your sensitive electronic
equipment. The unit is available in a variety of configurations to suit your electronic equipment’s
environmental requirements.
The self-contained, air cooled Liebert XDF is intended for installation in open areas. Installation in
closed-in areas, such as in a closet, alcove or similar space, requires field-supplied ducting, an exter-
nal booster fan and sufficient makeup air. Contact your local Liebert representative before installing
the XDF in an area that might inhibit heat dissipation.
The water/glycol cooled unit, however may be installed in closed-in areas, subject to clearances of
three feet in the front, rear and right side. See Figure 6. This is possible because heat rejected from
the XDF cabinet is carried away in the coolant.
2.1 Operational Overview—Self-Contained, Air Cooled Model
The self-contained, air cooled XDF model employs a compressorized, direct expansion cooling system
rated at 14kW to supply cooling air to rack-mounted equipment. A bank of fans circulates this cooling
air through the electronic equipment in the XDF (see Figure 1). An evaporator coil extracts heat
from the circulating air. That heat is transferred to a condenser at the top of the XDF and exhausted
into the room.
The XDF’s backup ventilation system operates automatically if power fails or if any XDF cooling sys-
tem component fails.
Figure 1 Component location, general operational layout of self-contained, air cooled model
Condenser Air
Entry Point
Heated Air Exhaust
Evaporator Fans
circulate cooling air
Condenser Coil transfers
heat extracted from
electronic equipment
cabinet to incoming air
Condenser
Coil - 1 of 2
Evaporator Coil
extracts heat from
air circulated through
the rack equipment
compartment
Rack-Mount Equipment
Compartment (isolated
from external air and top
condenser section)
Compressor
iCOM Controller
Backup Ventilation
Air Intake
Condenser Air
Entry Point