Vertiv Liebert CR012 - Page 27

Liebert CR012 Precision Air Conditioning User Manual
22 Chapter 2 Installation
1. For bottom piping, before welding the compressor discharge pipe and liquid pipe, follow the
requirement labeled on the copper pipe; Cut the copper pipe using a cutter (a little bit of the compressor
lubricating oil may leak); however, do not weld the copper cap on the seal directly as it may result in
heating of the oil following which it may catch fire.
2. The exposure time of the system pipes should not exceed 15 minutes. If exposed for too long, it will lead to the
PVE refrigeration oil being affected with damp. It may result in an adverse effect on the life of the key
components and the stability of the system operation.
Installing Pipe Extension Kit (for site installation)
There are instances where the one-way equivalent length of the pipe exceeds 30m. Or suppose the vertical distance
between the condenser and the indoor unit exceeds the value in the first table 2-6.
Vertical distance between the Indoor and Outdoor unit
Table 2-6
Positioning of the Outdoor Unit
Height
Outdoor unit is higher than the Indoor unit
Maximum: 30m
Outdoor unit is lower than the indoor unit
Maximum: 8m
Equivalent length of the partial components
Table 2-7
Outer diameter (OD) of the liquid pipe
(inches)
Equivalent length (meters)
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
A trap must be installed every 7.5m of the vertical distance. Please consult Vertiv for such specific inquiry and
installation.
There is no necessity of cutting the indoor unit pipes 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 refrigeration oil, Thus, it accounts for operational safety
and also extends the service life of the compressor (For electrical connections related to the pipe extension kit, refer
to the Electrical Installation section).
Look at the procedure for installing the Solenoid valve in the liquid pipe:
The solenoid valve must be as close to the indoor unit as possible. The valve body and coil of the solenoid valve are
separated when the valve is shipped out.
Mount the valve body horizontally in the refrigerant pipe as shown in Figure 2-22. Pay attention to the arrow on the
valve body as the arrow indicates the flow direction of the refrigerant in the valve. Ensure that the arrow points
towards the indoor unit.
Figure 2-22 Installing the Solenoid valve horizontally