Vertiv | Liebert PEX4 | User Manual 36
Installation
• Long piping kit should be added to the equivalent length marked with *.
• The equivalent values for metric and imperial conventions are shown in Table 2-8.
• D: Discharge line, L: Liquid pipe.
• 25/22: horizontal pipe diameter is 25 mm, vertical pipe diameter is 22 mm
• If the pipe length exceeds 60 m or less than 20 m, please consult Vertiv local representative for
details.
• If the outdoor temperature is below -15 °C, use the low temperature kit and consult Vertiv local
representative for details.
Table 2-9 Recommended Dimensions for Piping
Piping Size (outside diameter) Wall thickness
mm inch mm inch
16 5/8 ≥1 0.04”
19 >3/4 ≥1 0.04”
22 7/8 ≥1 0.04”
25 1 ≥1.1 0.04”
28 1-1/8 ≥1.2 0.05”
32 >1-1/4 ≥1.5 0.06”
35 1-3/8 ≥1.5 0.06”
Table 2-9 shows the copper piping specication as per IEC 61000-3-12. If the project site uses semi-hard or
soft copper pipes, consult Vertiv technical sta for the selection wall thickness, otherwise it leads to system
leakage or explosion.
2.6.1. Refrigerant Piping Connection General Principle
The recommended “Equivalent length” for each connector is shown in Table 2-11 including the calculation of the
pressure loss caused by the elbow joint. The installer should conrm the suitability of the site according to the
following situation.
1. If the equivalent length exceeds 30 m, or the vertical height dierence between the indoor and outdoor
units exceeds the values given in Table 2-10, consult Vertiv local representative for technical support before
installation and if any modication is required.
Table 2-10 Vertical Height Dierence Between Indoor and Outdoor Units
Relative position Distance
Outdoor unit higher than indoor unit Max: +20 m
Outdoor unit less than indoor unit Maximum: - 5 m
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