Emerson Xtreme Density manual Supply, return pipe sizes for refrigerant loop

Designing a Liebert XD Solution

Figure 23 Piping for Liebert XDP/Liebert XDC used with Liebert XD cooling units

20ft.

(6.7m)

max.

9ft.

(2.7m)

max.

Liebert XDP/ Liebert XDC

All supply and return mains must be level with or above the top of all Liebert XDP or Liebert XDC units

Liebert XD

Cooling

Modules

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.

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.

Table 5	Supply, return pipe sizes for refrigerant loop
		Key to Piping
	Pipe Function	in Figure 24	Size / Equivalent Pipe Length
Liebert XDP supply line, from Liebert XDP supply		A	1-1/8" OD for lengths up to 60 feet
to farthest Liebert XD cooling module			1-3/8" OD for lengths over 60 but less than 175 feet
Liebert XDP return line, from farthest Liebert XD		B	2-1/8" OD for lengths up to 60 feet
cooling module to Liebert XDP return			2-5/8" OD for lengths over 60 but less than 175 feet
From any model Liebert XDO/Liebert XDH supply		C	1/2" OD for lengths up to 10 feet
to supply line of Liebert XDP			7/8" OD for lengths over 10 but less than 25 feet
From any model Liebert XDO/Liebert XDH return		D	7/8" OD for lengths up to 10 feet
to return line of Liebert XDP			1-1/8" OD for lengths over 10 but less than 25 feet
From any model Liebert XDV/Liebert XDCF supply		C	1/2" OD for lengths up to 10 feet
to supply line of Liebert XDP			5/8" OD for lengths over 10 but less than 35 feet
From any model Liebert XDV/Liebert XDCF return		D	5/8" OD for lengths up to 10 feet
to return line of Liebert XDP			7/8" OD for lengths over 10 but less than 35 feet

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.

NOTE

To minimize the amount of refrigerant required, do NOT oversize the piping.

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