Piping and Filling with Refrigerant: R-134a and R-407c Circuits
21
2.5.1 Calculating Refrigerant Charge—Example
Using Tables 6, 7, 8 and 9, 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 XDC with Liebert XD cooling modules (Liebert XD Cool-
Frame, Liebert XDH, Liebert XDO and Liebert XDV). The example below combines one Liebert XDC
with 20 Liebert XDV8 cooling modules.
Table 9 R-134a refrigerant charge for Liebert XD Flex Pipe connector lines to and from any
model Liebert XDO/Liebert XDH/Liebert XDV/Liebert XDCF
Refrigerant Charge,
lb. (kg) Metal Liebert XD Flex Pipe Connector Length
Supply Line Diameter 1/2"
0.3 lb. (0.14) 4 ft. Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.5 lb. (0.23) 6 ft. Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.7 lb. (0.32) 8 ft. Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.8 lb. (0.36) 10 ft. Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
Return Line Diameter 5/8"
0.01 lb. (0.01) 4 ft. Liebert XD Flex Pipe existing Liebert XDV systems
0.02 lb. (0.01) 6 ft. Liebert XD Flex Pipe existing Liebert XDV systems
0.03 lb. (0.01) 8 ft. Liebert XD Flex Pipe existing Liebert XDV systems
0.03 lb. (0.01) 10 ft. Liebert XD Flex Pipe existing Liebert XDV systems
Return Line Diameter 1"
0.13 lb. (0.06) 4 ft Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.2 lb. (0.096) 6 ft Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.27 lb. (0.126) 8 ft Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
0.33 lb. (0.15) 10 ft Liebert XD Flex Pipe Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF supply
Table 10 Calculating refrigerant charge—example
Components
Number of Units
or Piping Length,
feet
Pounds
Per Component Total, lb.
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
Table 11 Worksheet to calculate refrigerant charge
Components
Number of Units
or Piping Length
Pounds
Per Component Total
Total
