Emerson Liebert Xtreme Density Specifications download pdf (Page 25)

Designing a Liebert XD Solution

3.12 Bypass Flow Controllers

To ensure the XDP/XDC pumps operate within the optimum range, some installations require one or

more bypass flow controller(s). These devices are added to the field piping, and simulate the flow of

additional cooling modules.

Each bypass flow controller should be installed with one shutoff valve to allow the controller to be dis-

abled when cooling modules are added to an XD system.

Bypass flow controllers may be placed anywhere in the field piping but should be placed in a conve-

nient, accessible location. See Figures 20 and 21 for piping details of the bypass flow controller.

Refer to Table 4 to determine the number of bypass flow controllers needed, based on the total nomi-

nal cooling capacity of the cooling modules in each XD system.

Figure 20 Bypass flow controller arrangement

Figure 21 Bypass flow controller details, dimensions

Table 4 Bypass flow controllers required in a Liebert XD system

Number of Bypass Flow Controllers

In XDP System In XDC System

XDV Units

16-20 00

12-15 11

8-11 22

4-7 3 Not Recommended

XDO Units

8-10 00

6-7 11

4-5 22

2-3 3 Not Recommended

Return

Main

7/8" Refrigerant Grade

Full Port Ball Valve

Field-Supplied and Field-Installed

Supply

Main

Bypass Flow Controller

(Field-Installed)

Flow Direction

7/8

(2.2mm) ID

(102mm)

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Emerson Liebert Xtreme Density Specifications Page 25