Rittal LCU DX
19
6 Installation
EN
6.4.2
Connecting the external unit
Power is supplied to the external unit via a 3-wire con-
nection cable (230–240 V, 1~, N, PE). As external units
are generally sited outdoors, a UV-resistant cable should
be used.
Strip approximately 45 mm from the rubber sheathing
of the connection cable.
Trim the neutral conductor (N) and the phase conduc-
tor (L) to a length of approximately 35 mm. Leave the
length of the PE conductor at approximately 45 mm.
Remove approximately 9 mm from the insulation of all
conductors with a suitable tool.
Fig. 9:
Dimensions for removing the rubber sheathing and in-
sulation
Attach wire end ferrules without insulating collar to the
ends of the cables, using a four-jaw pressing tool.
Insert the cable into the connection box in the device
from below.
Attach the cooling unit to the strain relief provided.
Connect the cable in the connection box as shown in
the circuit diagram in section 11.7 "Circuit diagram" to
the correspondingly labelled terminals (PE, L1, N).
Connect the external units using an all-pole isolating
device as described in DIN EN 60335-2-40. This dis-
connector device must ensure at least 3 mm contact
opening when switched off.
The customer should provide a pre-fuse in the supply
line to the external unit, as specified on the rating plate
of the device.
6.4.3
Connecting the internal unit
Connecting the internal unit simply entails connecting
the cables routed from the external unit, which comprise
a data line and a 230 V pilot wire as described in
section 11.7 "Circuit diagram".
The fault signals may be picked off at the internal unit
(floating contacts).
Should you wish to switch the internal unit on and off
via a remote switch (e.g. for an external fire shutoff),
connect a remote contact (normally open contact) in
the electronic box to terminals L1 and 11 for the "sin-
gle" version and terminals L1 and 11 as well as L2 and
23 ("remote" or "ON/OFF") for the "redundant" version
(see section 11.7.3 "Circuit diagram, external unit"). In
the closed state, the system is then deactivated.
If both terminals are jumpered, the status message
"– –" will appear in the display.
6.5
Checking the entire system prior to
commissioning
Before operating the cooling system, the entire system,
including the complete cooling system, must be
checked for conformity with the relevant diagrams, sys-
tem flow charts and piping and instrumentation dia-
grams, and wiring plans.
Cooling systems must be checked by a trained plant in-
spector (as defined in EN 13313) and should include a
review of the following points:
1. Inspect the documents.
2. Check the safety switchgear for pressure limiting to
ensure that the safety switchgear for pressure limit-
ing is operational and correctly installed.
3. Check selected hard solder connections on pipe-
work for compliance with EN 14276-2.
Caution!
Follow the connection regulations of the
appropriate electrical power company.
The voltage specified in the wiring plan
or on the rating plate must match the
mains voltage.
The unit has a high discharge current.
Before connecting to the supply circuit,
therefore, it is essential to make a 6 mm²
earth connection (see section 11.7 "Cir-
cuit diagram").
The pre-fuse specified in the wiring
plan / rating plate should be provided to
protect the cable and equipment from
short-circuits. The unit must be individu-
ally fused.
The unit must be connected to the mains
using an all-pole red/yellow isolating de-
vice as described in DIN EN 60335-2-40,
which ensures at least 3 mm contact
opening when switched off.
No additional control equipment may be
connected upstream of the device at the
supply end.
45
9
9
Danger!
Take utmost care not to short-circuit the
phase conductor with the zero conduc-
tor or the earth conductor. Otherwise,
there is a risk of damage or injury.
