Emerson Xtreme Density manual Determining Refrigerant Volume

Designing a Liebert XD Solution

3.16Determining 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.

NOTE

All lengths in Tables 7, 8, 9 and 10, are actual pipe lengths, not equivalent pipe lengths.

3.16.1 Liebert XDP/Liebert XDC Pumped R-134a Circuit Volume

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,	Per Liebert XD Unit
	(Excludes Connector Lines
lb (kg)	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

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