Emerson Liebert Xtreme Density - Manual (Page 32)

Designing a Liebert XD Solution
26
3.16 Determining Refrigerant Volume
After the preliminary system design is completed, Tables 7, through 15 may be used to determine
the amount of refrigerant required. Perform the calculation below for each Liebert XD system being
configured.
3.16.1 Liebert XDP/Liebert XDC Pumped R-134a Circuit Volume
NOTE
All lengths in Tables 7, 8, 9 and 10, are actual pipe lengths, not equivalent pipe lengths.
NOTE
System refrigerant volume calculations in Tables 7, 8, 9 and 10, are based on a fully loaded
system. Additional charge may be required for lightly loaded systems.
Table 7 System R-134a charge for a Liebert XDP/Liebert XDC with any model Liebert
XDH/Liebert XDO/Liebert XDV/Liebert XDCF
Refrigerant Charge,
lb (kg)
Per Liebert XD Unit
(Excludes Connector Lines
to and from Liebert XD Cooling Module)
157 lb. (65.7kg) Liebert XDP/Liebert XDC
3.55 lb. (0.66kg) Liebert XDO
2.32 lb. (1.05kg) Liebert XDV
5.32 lb. (2.41kg) Liebert XDH
1.41 lb. (0.64kg) Liebert XDCF
Table 8 System refrigerant charge for the supply and return mains
Refrigerant Charge,
lb/foot (kg/m) Supply/Return Main Length and Diameter
0.45 (0.67) Main supply actual length per 1-1/8" OD copper tubing
0.68 (1.01) Main supply actual length per 1-3/8" OD copper tubing
0.28 (0.42) Main return actual length per 2-1/8" OD copper tubing
0.43 (0.64) Main return actual length per 2-5/8" OD copper tubing
Table 9 R-134a refrigerant charge for hard-piped connector lines to and from any model
Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF
Refrigerant Charge,
lb/foot (kg/m) Hard-Piped Connector Length and Diameter
0.08 (0.12)
1/2" OD Liebert XDO/Liebert XDH/Liebert XDV/Liebert XDCF supply connector
actual length
0.13 (0.19) 5/8" OD copper tubing Liebert XDV/Liebert XDCF supply connector actual length
0.26 (0.39) 7/8" OD Liebert XDO/Liebert XDH supply connector actual length "
0.02 (0.03) 5/8" OD copper tubing Liebert XDV/Liebert XDCF return connector actual length
0.04 (0.06) 7/8" OD copper tubing Liebert XDV/Liebert XDCF return connector actual length
0.04 (0.06) 7/8" OD copper tubing Liebert XDH/Liebert XDO return connector actual length
0.07 (0.1) 1-1/8" OD copper tubing Liebert XDH/Liebert XDO return connector actual length