Vertiv Liebert XD Series, System Design Manual

Page: 39 / 200

Figure 3.14 Piping for Liebert XDP/Liebert XDC used with Liebert XD cooling modules
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 nitrogen during
brazing to prevent excessive oxidation and scale formation inside the piping. Prevailing good refrigeration
practices must be employed for piping supports, leak testing, dehydration and charging. Failure to use
good system practices may result in damage to the system. Refer to the ASHRAE refrigeration handbook
for general good-practice refrigeration piping.
Follow all guidelines in Liebert XD Piping System Design on the previous page and Liebert XD Piping
Slope on the next page during installation.
Insulate all piping lines to prevent condensation in applications where the dew point approaches the
R-134a refrigerant temperature. This might occur where Liebert XD module piping is above a dropped
ceiling or in other areas not measured by sensors connected to the Liebert XDP or Liebert XDC.
See Table 3.7 below for recommended pipe sizes and Figure 3.15 on the next page for piping segment
locations.
Pipe Function
Key to Piping
in Figure 3.15 on the
next page
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/Liebert XDR
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/Liebert XDR
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
Table 3.7 Supply, return pipe sizes for refrigerant loop
Vertiv | Liebert® Xtreme Density™ System Design Manual | 39