Refrigerant Line Sizes And Equivalent Lengths; Refrigerant Charge Requirements For Air-Cooled Systems - Liebert PX018 Installer's/User's Manual

• Do not run piping directly in front of discharge air stream.
• Refrigerant oil – do not mix oil types (see
Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping. The indoor
cooling unit has a factory-installed high-pressure safety switch in the high side refrigerant circuit. Consult
building codes to determine whether condensers without receivers require field-provided pressure relief
devices. A fusible plug kit is available for field installation on condensers without receivers.
NOTE: All indoor and outdoor field refrigerant piping must have at least 1/2 in. of insulation. All outdoor
insulation must be UV and ozone resistant.

5.2.2 Refrigerant Line Sizes and Equivalent Lengths

Table 5.4 below lists requirements for field-installed refrigerant piping for the system.
Table 5.4 Recommended refrigerant line sizes for standard- and digital-scroll
models, OD Copper (inches)
Model
Equivalent
Length
50 ft. (15 m)
100 ft. (30 m)
150 ft. (45 m)
300 ft. (91 m)
1. Contact your Vertiv™ representative for line sizing for runs longer than maximum equivalent length shown in the table.
2. Must down-size vertical riser one trade size (1-1/8" to 7/8", 7/8" to 3/4", 3/4" to 5/8", or 5/8" to 1/2").
Source: DPN000788, Rev. 5

5.2.3 Refrigerant Charge Requirements for Air-cooled Systems

The following tables provide the refrigerant charge requirements for the Liebert PDX, connected piping,
and condenser options.
Table 5.5 Approximate R-410A refrigerant charge for air-cooled Liebert PDX
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide |
PX011 PX018
Hot Gas Liquid Hot Gas
Line Line Line
1/2 3/8 5/8
5/82 1/2 5/8
2
5/8 1/2 5/8
2 2
5/8 1/2 3/4
Model
PX011
PX018
PX023
PX029
Compressor Oil on page 85).
PX023
Liquid Hot Gas Liquid
Line Line Line
1/2 3/4 5/8
1/2 3/4 5/8
1/2 3/4 5/8
2
5/8 7/8 5/8
Downflow,
lb (kg)
4.6 (2.1)
5.0 (2.3)
5.0 (2.3)
6.6 (3.0)
PX029
Hot Gas Liquid
Line Line
7/8 5/8
7/8 5/8
7/8 5/8
2
1-1/8 3/4
Upflow,
lb (kg)
5.1 (2.3)
7.1 (3.2)
7.1 (3.2)
7.4 (3.4)
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