Vertiv Liebert XD Series, System Design Manual

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Figure 3.21 Hard-pipe connection diagram for Liebert cooling modules
3.18 Piping Details—Return Header Port Orientation
The return header port from a Liebert XD cooling module is a gravity return and must be properly
oriented to the refrigerant return header for proper flow. The return header contains R134a refrigerant in
gas and liquid form. Improperly connecting a cooling module’s return header port to the return header
could permit liquid refrigerant to back up into the cooling module. See Figure 3.22 on the facing page for
proper orientation.
Supply header ports can be oriented at any angle to the header because supply headers carry only liquid
R134a refrigerant and are not gravity operated.
Vertiv | Liebert® Xtreme Density™ System Design Manual | 44