Vertiv Liebert XD Series, System Design Manual

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Components Number of Units or Piping Length, feet Pounds Per Component Total, lb.
Liebert XDP/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 3.18 Calculating refrigerant charge—example
Components Number of Units or Piping Length Pounds Per Component Total
Total
Table 3.19 Worksheet to calculate refrigerant charge
Verify that the refrigerant volume of the Liebert XD system with the longest piping length is within the
allowable limit. If the allowable limit is exceeded, the Liebert XDP/Liebert XDC should be moved closer to
the cooling modules (refer to
Liebert XD Refrigerant on page 55 for limits and related details). Another
way to shorten the total pipe length is to reroute the pipe runs.
3.24 Chilled Water Piping
The Liebert XDP is offered only with a two-way chilled water control valve. Some applications may require
the use of a pressure activated bypass valve to prevent dead-heading of the chilled water pump. This
bypass valve must be specified by the engineer responsible for design of the chilled water field piping
system.
NOTICE
Risk of particles in chilled water. Can cause equipment damage and reduced cooling.
Failure to install a strainer in the supply line to the Liebert XDP can result in damage to the unit’s heat
exchanger.
Install a 20-40 mesh strainer on the chilled water supply to the Liebert XDP. The strainer is required to
prevent particles in the chilled water from entering the heat exchanger of the Liebert XDP. The maximum
distance of the strainer from the Liebert XDP is 10 feet (3m).
Vertiv | Liebert® Xtreme Density™ System Design Manual | 58