6 Installation
EN
16
Rittal LCU DX
6
Installation
6.1
General information
The internal unit and the external unit must be connect-
ed with suitable copper pipework. With the TS IT server
enclosure, this pipework can either be inserted into the
enclosure from above or from below.
When using in a Micro Data Center, a cable duct is pro-
vided and this must be used for inserting the pipework
into the safe.
In its delivered state, the internal unit is filled with 1.5 bar
nitrogen. It is therefore crucial that the following steps
are carried out in the order shown.
6.2
Notes on pipework
The following basic rules should be observed when con-
necting the internal unit and external unit.
General information
1. The pipes may only be made from special copper
piping that has been cleaned on the inside and
sealed at both ends. The material of the copper
pipework must comply with the specifications out-
lined in EN 12735-1 / EN 12735-2 and DIN 8964-3.
2. The external diameters of the copper pipes for the
intake gas line from the internal unit to the external
unit, as well as the liquid line from the external unit to
the internal unit, must comply with the values given
in section 11 "Technical specifications".
In order to ensure the correct spatial arrangement of the
pipework, particular consideration should be given to
the position of the individual pipes, the flow conditions
(two-phase flow, oil transportation in part-load opera-
tion), condensation processes, thermal expansion, vi-
bration, and good accessibility.
As a general rule, pipelines should be laid in such a way
as to prevent damage associated with routine activities.
For safety reasons, and in order to protect the environ-
ment, the following aspects should be taken into ac-
count when laying pipework:
1. There must not be any threat to human safety, i.e.
escape and emergency vehicle routes must not be
obstructed or restricted in any way. No detachable
connections or fittings must be positioned in publicly
accessible areas.
2. Pipework should be protected from the thermal in-
fluence of hot lines and heat sources by means of
spatial separation.
3. Refrigerant lines must be protected or covered if
there is a risk of damage.
4. Flexible connecting parts such as connection lines
between indoor and outdoor devices that could be-
come displaced during regular work operations
must be protected against mechanical damage.
5. The maximum distance between the supports of the
copper pipes is 1 m for pipelines with 1/4" to 3/8",
1.25 m for pipelines with 1/2" to 5/8" and 2 m for
pipelines with 3/4" to 7/8".
Laying the pipework
1. The equivalent length of the overall line between the
internal unit and the external unit must not exceed
the maximum length as set out in section 11 "Tech-
nical specifications". To calculate the equivalent
length, in addition to the actual length of the pipeline,
you should also make allowance for the equivalent
length of curves and valves.
2. The number of curves should be kept to a bare min-
imum so as to avoid pressure losses. Where curves
are unavoidable, the radius chosen should be as
large as possible.
3. Generally speaking, the lines between the internal
unit and external unit should take the shortest pos-
sible route. Exceptions are only admissible to avoid
unnecessary bends or circumvent extreme heat
sources.
4. Where possible, refrigerant lines should not be rout-
ed through rooms where people spend a lot of time,
such as offices or meeting rooms.
5. The intake gas line must be laid with an incline of 1%
in the direction of flow of the refrigerant.
6. When laying refrigerant lines, please ensure that
there is no overarching of liquid lines and no dipping
of gas lines (intake gas line). Oil could collect here, or
in the case of the liquid line, gas bubbles could form.
Caution! Risk of malfunction or damage!
Installation work, particularly the laying
of the refrigerant pipework between the
internal and external unit of the LCU DX,
must only be carried out by trained,
qualified and accredited cooling system
specialists.
Note:
Installation of the pipework, creation of a vac-
uum and filling with refrigerant must only be
carried out by qualified, accredited special-
ists in accordance with the valid technical
regulations.
Furthermore, when carrying out the installa-
tion, it is important to observe all the pipe-
work instructions in section 6.2.
Note:
Routing and support of the pipework has a
significant influence on a cooling system's
operational reliability and service-friendliness.
