Vertiv | Liebert PEX4 | User Manual 37
Installation
2. The equivalent length can be calculated by selecting appropriate dimension in accordance with the
respective diameter. For details refer Table 2-11.
Table 2-11 Equivalent Length of Each Local Component
Diameter of Liquid
Pipe (inch)
Equivalent Length (m)
90° Elbow 45° Elbow T Type Tee
3/8 0.21 0.10 0.76
1/2 0.24 0.12 0.76
5/8 0.27 0.15 0.76
3/4 0.3 0.18 0.76
7/8 0.44 0.24 1.1
1-1/8 0.56 0.3 1.4
• If the vertical distance between indoor and outdoor units exceeds the values in Table 2-10, consult Vertiv
local representative.
• ‘U’ trap should be provided at every 7.5 m of vertical distance. Please consult Vertiv local
representative for details.
• Notes and instruction labels are pasted onto the base and the side panel close to the ball valve. Ensure
that the ball valve must be wrapped with a wet cloth before brazing to protect the label from burning.
• Connect the discharge pipe and liquid pipe of the indoor unit according to the instructions on the labels.
• Horizontal sections of the discharge pipe should be sloped down from the compressor with a slope of at
least 1:200 (5 mm down for each 1 m run).
• The discharge pipes should be insulated where they are routed in the conditioned space
(including under the raised oor).
The exposure time of system pipes must not exceed 15min. Longer exposure will result in moisture
aecting the compressor lubrication oil, which aect the life of the key components and the system
operation stability.
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