Technical Specifications

Designing a Liebert XD Solution
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3.23.2 Calculating Refrigerant R134a Charge—Example
Using Tables 15, 16, 17 and 18, calculate the refrigerant charge of the individual sections of your
Liebert XD system. Add the calculated charge amounts to determine the amount of R-134a
refrigerant required for one system combining a Liebert XDP with Liebert XD cooling modules
(Liebert XDCF, Liebert XDH, Liebert XDO, Liebert XDR and Liebert XDV). The example below
combines one Liebert XDP with 20 Liebert XDV8 cooling modules.
Table 17 R-134a refrigerant charge for hard-piped connector lines to and from any model
Liebert XDH/Liebert XDO/Liebert XDV
Refrigerant Charge,
lb/foot (kg/m)
Hard-Piped Connector Length and Diameter
0.08 (0.12) 1/2" OD Liebert XDH/Liebert XDO/Liebert XDR/Liebert XDV supply connector actual length
0.13 (0.19) 5/8" OD copper tubing Liebert XDV supply connector actual length
0.26 (0.39) 7/8" OD Liebert XDO/Liebert XDH/Liebert XDR supply connector actual length
0.02 (0.03) 5/8" OD copper tubing Liebert XDV return connector actual length
0.04 (0.06) 7/8" OD copper tubing Liebert XDV return connector actual length
0.04 (0.06) 7/8" OD copper tubing Liebert XDH/Liebert XDO/Liebert XDR return connector actual length
0.07 (0.1)
1-1/8" OD copper tubing Liebert XDH/Liebert XDO/Liebert XDR return connector actual
length
Table 18 R-134a refrigerant charge for Flex Pipe connector lines to and from any model
Liebert XDO/Liebert XDH/Liebert XDV/Liebert XDCF
Refrigerant Charge, lb. (kg) Metal Flex Pipe Connector Length
Supply Line Diameter 1/2"
0.3 lb. (0.14) 4 ft. Flex Pipe All Liebert XD Cooling Module
0.5 lb. (0.23) 6 ft. Flex Pipe All Liebert XD Cooling Module
0.7 lb. (0.32) 8 ft. Flex Pipe All Liebert XD Cooling Module
0.8 lb. (0.36) 10 ft. Flex Pipe All Liebert XD Cooling Module
Return Line Diameter 5/8"
0.01 lb. (0.01) 4 ft. Flex Pipe existing Liebert XDCF/Liebert XDV systems
0.02 lb. (0.01) 6 ft. Flex Pipe existing Liebert XDCF/Liebert XDV systems
0.03 lb. (0.01) 8 ft. Flex Pipe existing Liebert XDCF/Liebert XDV systems
0.03 lb. (0.01) 10 ft. Flex Pipe existing Liebert XDCF/Liebert XDV systems
Return Line Diameter 1"
0.13 lb. (0.06) 4 ft Flex Pipe Liebert XDH/Liebert XDO/Liebert XDR supply
0.2 lb. (0.09) 6 ft Flex Pipe Liebert XDH/Liebert XDO/Liebert XDR supply
0.27 lb. (0.12) 8 ft Flex Pipe Liebert XDH/Liebert XDO/Liebert XDR supply
0.33 lb. (0.15) 10 ft Flex Pipe Liebert XDH/Liebert XDO/Liebert XDR supply
Table 19 Calculating refrigerant charge—example
Components
Number of Units
or Piping Length, feet Pounds Per Component Total, lb.
Liebert XDP/Liebert XDC 1 157 157
Liebert XDV8 Cooling Modules 20 2.32 46.4
Supply Main, 1-1/8" 100 0.45 45
Return Main, 2-1/8" 100 0.28 28
Liebert XDV 1/2" supply Liebert
XD Flex Pipes
20 0.8 16
Liebert XDV 5/8" return Liebert
XD Flex Pipes
20 0.03 0.6
Total 293