Vertiv | Liebert® CRV4 | User Manual 30
Mechanical Installation
3.3.5. Installing Long Piping Kit (for site installation)
There are instances where the one-way equivalent length of the pipe exceeds 30 m. Or suppose the vertical
distance between the outdoor and the indoor units exceeds the value in Table 3-3. Prior to installation, consult
Vertiv representative whether to use the long piping kit and for the equivalent length of the recommended pipe
(consider the resistance loss calculation at the bends). The equivalent length of each kit is shown in Table 3-4,
and should be selected according to the eld condition.
Table 3-3 Vertical Distance between the Indoor and Outdoor Units
Items Distance
Maximum equivalent lengths from the indoor unit to the outdoor 50 m
Outdoor unit is higher than the Indoor unit Maximum: 30 m
Outdoor unit is lower than the indoor unit Maximum: 8 m
Traps on the vertical refrigerant discharge pipe Install trap every 7.5 m
Table 3-4 Equivalent Length of the Partial Components
Outer Diameter (OD) of the Liquid Pipe
(inch)
Equivalent Length (m)
90° bend 45° bend T Type 3-way
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 3-3, consult Vertiv
representative.
• ‘U’ trap should be installed for every 7.5 m of vertical distance, consult Vertiv representative for details.
• There is no necessity of cutting the indoor unit piping while installing the solenoid valve.
After the entire system is installed, open the ball valve to keep the pressure and carry out the vacuum
operation, thereby avoiding the moisture absorption of the compressor lubricant oil. Thus, it accounts for
operational safety and also extends the service life of the compressor; for electrical connections related to the
long piping kit, refer to Chapter 4 Electrical Installation.
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