Filter
Top Products
Introduction
2
2.0 INTRODUCTION
2.1 Product Description
The Liebert XDH cooling module is designed to be placed within a row of server enclosures in a hot-
aisle-cold-aisle arrangement. The Liebert XDH, available in a half-rack-width unit, is intended for
use with a Liebert XD pumped refrigerant cooling system, supplied by either a Liebert XDP or Liebert
XDC.
Warmer air from the enclosures is drawn in through the rear of the Liebert XDH, cooled and blown
into the cold aisle in a diffuse pattern. The cooling air is then drawn into the enclosures to cool the
equipment.
The Liebert XDH has dual refrigeration circuits, one in the upper half of the unit and the other in the
lower half. This permits increasing and decreasing cooling levels in response to server room condi-
tions. The dual refrigeration circuits permits interlaced connection of two Liebert XD refrigerant
sources to enhance system reliability.
Controls on the front of the Liebert XDH permit independent operation of the two banks of fans. Dual
power connections ensure continued fan operation if one of two electrical sources fails.
The Liebert XDH is intended for use in low-humidity environments and does not need a drain connec-
tion. A condensate pan under each refrigeration unit collects the small amount of moisture expected
in the server room. An optional, factory-installed condensate detection system is available. The Lie-
bert XDH is available with uni-directional or bi-directional air diffusers.
2.2 References
This document must be used together with site specific documentation and documentation for other
parts of the system.
2.3 Pre-Installation Checks
• Verify that the Liebert XDH voltage matches the available utility power. The serial tag with this
information is accessible by opening the Liebert XDH’s rear door. The tag is on a shelf near the
Liebert XDH’s midline.
• Check the received materials to be sure all required assemblies and parts have been received. If
you discover any external damage, report it to the shipping company and your local Liebert repre-
sentative.
2.4 Parts Included With the Liebert XDH
• User manual (this document)
• Liebert XDH module
• Power cords
• Shipping/floor mounting brackets
• Tie-down bracket assembly
• Diffusers (top and bottom)