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Introduction
3
2.5 Installation Considerations
The Liebert XDH is designed for placement within a row of computer cabinets in the data center in a
hot-aisle-cold-aisle arrangement. The Liebert XDH is 12" (305mm) wide, so it takes up little space.
For installation arrangement, see 4.2 - Installing the Liebert XDH Within the Enclosure Row.
Be sure to follow all applicable codes.
Determine whether the Liebert XDH includes the condensate detection option (factory-installed).
This option will require separate low voltage connections to a monitoring unit. A front panel alarm
and indicator alert the user to condensation inside the unit. To minimize the possibility of condensa-
tion, insulate all piping between the Liebert XDH and the Liebert XDP or Liebert XDC.
If the Liebert XDH is installed at the end of a row, Liebert recommends using uni-directional air dif-
fusers to direct cooling air into the cold aisle, toward the equipment racks. If the Liebert XDH is
installed between racks within a row, Liebert recommends using bi-directional air diffusers, directing
the cooling air toward the equipment racks on either side of the Liebert XDH.
2.5.1 Room Preparation
The room should be well-insulated and must have a sealed vapor barrier. The vapor barrier in the
ceiling and walls can be a polyethylene film. Paint on concrete walls and floors should contain either
rubber or plastic.
Outside or fresh air should be kept to a minimum when temperature and humidity must be tightly
controlled. Outside air adds to the cooling, heating, dehumidifying and humidifying loads of the site.
Doors should be properly sealed to minimize leaks and should not contain ventilation grilles.
Table 1 Application limits
Input Voltage Range of Return Air Conditions to Unit
Minimum Maximum Dry Bulb Temperature Relative Humidity
-10% +10% 60° to 100°F (16° to 38°C) 20% to 80%
NOTE
The vapor barrier is the single most important requirement for maintaining environmental
control in the conditioned space.