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General product information
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3.0 GENERAL PRODUCT INFORMATION
3.1 Product/System Description
The Liebert XDH is designed for placement within a row of computer cabinets in the data center in a
hot-aisle-cold-aisle arrangement to maximize the Liebert XDH’s cooling: The unit takes in hot air
through the rear from the hot aisle, cools the air by air-to-fluid heat exchangers and discharges the
air through the front of the unit into the cold aisle.
Chilled R-134a refrigerant is provided to the Liebert XDH by a Liebert XD Pumping unit (Liebert
XDP) or by a Liebert XD Chiller (Liebert XDC). The Liebert XDH may be installed in a Liebert XD
piping system that includes other Liebert XD cooling modules, such as the Liebert XDO, Liebert XDV
or Liebert XD CoolFrame.
Replaceable front panels on the Liebert XDH may be customized to match the appearance of various
computer manufacturer’s equipment, allowing the Liebert XDH to blend in with adjacent server
equipment and enclosures. Air diffusers are available to direct cooling air for more efficient cooling,
depending on the Liebert XDH’s positioning in a row or at the end of a row.
The Liebert XDH is not expected to produce any condensation because of its location, usually in the
data center. A condensate pan is provided as a precaution. It does not have a drain fitting or other
means of being emptied.
A Liebert Liqui-tect moisture detection device and a contact-closure output are available as an option.
These options detect condensation in the Liebert XDH’s catch pan and connect to a monitoring or
alarm system. A front panel alarm and indicator alert the user to condensation inside the unit.
The complete cooling system consists of Liebert XDH modules, Liebert XDP or Liebert XDC pumped
refrigerant distribution units, power and signal cabling and interconnecting piping, see Figure 3
below.
Figure 3 Liebert XDH hydraulic schematic
3.2 Checking and Unpacking
When the Liebert XDH is delivered, inspect all items for either visible or concealed damage. Damage
should be immediately reported to the carrier and a damage claim filed with a copy sent to Liebert or
to your sales representative. If you later find any concealed damage, report it to the shipping company
and your local Liebert representative.
Check to be sure all required assemblies and parts have been received.
The Liebert XDH is shipped in protective packaging and secured to a pallet (see Figure 5). Do not
remove these protective items from the Liebert XDH before it is at the installation location. When
unpacking and handling the Liebert XDH, exercise extra care to prevent damage.
Liebert XDC
or
Liebert XDP
XD Cooling
Module *
XD Cooling
Module *
XD Cooling
Module *
XD Cooling
Module *
Pumped
Refrigerant
Liebert XDC
or
Liebert XDP
Supply Lines
(2 per unit)
Return Lines
(2 per unit)
Pumped
Refrigerant
* XDCF, XDH, XDO
or XDV