Vertiv Liebert XD Series, System Design Manual

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Figure 3.13 Liebert XD modules not in hot aisle/cold aisle configuration
These methods can increase the redundancy of any Liebert XD system:
• Hot aisle/cold aisle design
• Interlacing the modules with different Liebert XDPs or Liebert XDCs
• Using multiple types of Liebert XD cooling modules
• Containment methods
3.13 Liebert XD Piping System Design
All piping must be ASTM (American Society for Testing and Materials) Type “ACR” copper pipe. The
typical maximum operating pressure in the system is 90 psi (620kPa).
Piping for the Liebert XD system is arranged in a manner similar to piping for a chilled water system.
Liebert XD cooling modules are connected in parallel between the main return and supply pipes going to
and from the Liebert XDP/Liebert XDC. Figure 3.14 on the facing page represents a typical configuration.
The guidelines provided for pipe size must be strictly followed. Failure to size the main lines and
connection lines adequately may result in reduced cooling capacity.
The critical aspects of pipe sizing are
related to refrigerant volume and pressure drop. Each must be minimized.
Vertiv | Liebert® Xtreme Density™ System Design Manual | 38