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.