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Designing a Liebert XD Solution
23
Figure 23 Piping for Liebert XDP/Liebert XDC used with Liebert XD cooling units
The assembly and connection means used for piping in the Liebert XD system are similar to that of
conventional refrigeration systems. All piping should be installed with high temperature brazed
joints. Soft solder is not recommended. The lines being brazed MUST be filled with flowing dry nitro-
gen during brazing to prevent excessive oxidation and scale formation inside the piping.
Insulate all piping lines to prevent condensation in applications where the dew point approaches the
R-134a refrigerant temperature.
Please see Table 5 below for recommended pipe sizes and Figure 24 for piping segment locations.
For additional information about piping connections, see the unit’s user manual: Liebert XDP, 16641;
Liebert XDC, SL-16671; Liebert XDO, SL-16666; Liebert XDV, SL-16626; Liebert XDCF, SL-16678;
and Liebert XDH20 and Liebert XDH32, SL-17210.
Table 5 Supply, return pipe sizes for refrigerant loop
Pipe Function
Key to Piping
in Figure 24 Size / Equivalent Pipe Length
Liebert XDP supply line, from Liebert XDP supply
to farthest Liebert XD cooling module
A
1-1/8" OD for lengths up to 60 feet
1-3/8" OD for lengths over 60 but less than 175 feet
Liebert XDP return line, from farthest Liebert XD
cooling module to Liebert XDP return
B
2-1/8" OD for lengths up to 60 feet
2-5/8" OD for lengths over 60 but less than 175 feet
From any model Liebert XDO/Liebert XDH supply
to supply line of Liebert XDP
C
1/2" OD for lengths up to 10 feet
7/8" OD for lengths over 10 but less than 25 feet
From any model Liebert XDO/Liebert XDH return
to return line of Liebert XDP
D
7/8" OD for lengths up to 10 feet
1-1/8" OD for lengths over 10 but less than 25 feet
From any model Liebert XDV/Liebert XDCF supply
to supply line of Liebert XDP
C
1/2" OD for lengths up to 10 feet
5/8" OD for lengths over 10 but less than 35 feet
From any model Liebert XDV/Liebert XDCF return
to return line of Liebert XDP
D
5/8" OD for lengths up to 10 feet
7/8" OD for lengths over 10 but less than 35 feet
NOTE
To minimize the amount of refrigerant required, do NOT oversize the piping.
Liebert XDP/
Liebert XDC
SLOPE—The main supply and return lines to and from the Liebert XDP/Liebert XDC
must be sloped downward toward the Liebert XDP/Liebert XDC at a rate of 1-2" per
20 feet (25.4-51mm per 6m) of pipe run. Horizontal connector lines should also be
sloped downward from the cooling modules toward the main supply and return lines.
Liebert XD
Cooling
Modules
All supply and
return mains
must be level
with or above
the top of all
Liebert XDP or
Liebert XDC
units
9ft.
(2.7m)
max.
20ft.
(6.7m)
max.