18 Chapter 3 Mechanical Installation
Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual
Drain hole
Cable entry hole
Liquid pipe hole
Discharge pipe hole
Figure 3-17 Bottom pipe connectors
3.4.5 Installing Pipe Extension Kit (for site installation)
If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and condenser exceeds
the values in Table3-5, consult Emerson before installation to confirm whether extension kit is needed. The
recommended pipe sizes are ‘equivalent lengths’ (see Table 3-6 for equivalent lengths of partial components), with
the resistance caused by bends taken into account. The installer should confirm that the sizes are appropriate for the
site conditions.
1. The pipe sizes recommended in Table 3-6 are ‘equivalent lengths’, with the resistance caused by bends and valves
taken into account. The installer should confirm that the sizes are appropriate for the site conditions.
Table 3-5 Allowable vertical distance between indoor unit and condenser.
Relative position Value
Outdoor unit higher than indoor unit Max.: +30m
Outdoor unit lower than indoor unit Max.: -8m
Table 3-6 Equivalent lengths of partial components
Outer Diameter (OD) of liquid pipe (inch) Equivalent length (m)
90° bend 45° bend T type three-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
Note
A trap should be installed for every 7.5m of vertical distance. Please consult Emerson for details.
During the installation of the pipe extension kit, to avoid the pipe opening, it is recommended to install the solenoid
valve of the pipe extension kit onto the outside project pipe of the ball valve on the liquid pipe. The outer side or the
bottom of the unit is allowable. So, during installing the solenoid valve, you do not need to cut the indoor unit pipes.
After the whole system is installed, you can open the ball valve to keep pressure and carry out the vacuum operation,
avoiding the moisture absorption of the compressor refrigeration oil and ensuring the operation safety and life of the
compressor. For the electrical connections of the pipe extension kit, refer to 4.2.4 Connecting Solenoid Valve of Pipe
Extension Kit (Option For Site Installation).
Notes of solenoid valve installation
1. Solenoid valve should be installed between the floor and the ground nearby in the indoor unit when the room is
down piping. Solenoid valve should be installed above the indoor unit when the room is up piping.
2. Both up and down piping, the position of solenoid valve should be as close as possible to indoor unit.
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