Piping and Filling with Refrigerant: R-134a and R-407c Circuits
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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