Technical Specifications

Designing a Liebert XD Solution
33
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 34 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.
Figure 34 Liebert XD return header orientation
Port Kit, Return Header Port
Connection to a Liebert XD
Flex Hose, or a hard piped
connection from a cooling
module to the return header.
A
c
c
e
p
t
a
b
l
e
N
o
t
A
c
c
e
p
t
a
b
l
e
R134a Refrigerant
GAS
R134a Refrigerant
LIQUID