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4 Assembly and connection
4.3 Fitting the cooling unit
EN
The cooling unit is designed for mounting on an IT
security safe. The installation may only be performed
by trained staff.
4.4 Connecting the condensate discharge
A condensate discharge hose must be connected
for the SK 3126.230 and SK 3126.240 units.
The condensate discharge hose is placed on a
siphon made of copper tubing.
The long leg of the siphon is led outside through the
cable duct of the safe.
The hose and the siphon are included in the scope
of delivery.
Fig. 4:
Connecting the condensate discharge
4.5 Notes on electrical installation
When performing the electrical installation, it is im-
portant to observe all valid national and regional reg-
ulations as well as the provisions of the responsible
power supply company. Electrical installation must
only be carried out by a qualified electrician who is
responsible for compliance with the existing stand-
ards and regulations.
4.5.1 Connection data
– The connected voltage and frequency must corre-
spond to the values stated on the rating plate.
– The cooling unit must be connected to the mains
via an all-pin isolating device, which ensures at
least 3 mm contact opening when switched off.
– No additional temperature control may be con-
nected upstream of the unit at the supply end.
– Install the pre-fuse specified on the rating plate
(miniature circuit-breaker "K" characteristic or slow
fuse) to protect the cable and equipment from short-
circuits.
– The mains connection must ensure low-noise po-
tential equalisation.
28
4.5.2 Overvoltage protection and
supply line load
– The unit does not have its own overvoltage pro-
tection. Measures must be taken by the operator
at the supply end to ensure effective protection
against lightning and overvoltage. The mains volt-
age must not exceed a tolerance of ±10%.
– In accordance with IEC 61 000-3-11, the unit is
intended solely for use at sites with a continuous
current-carrying capacity (incoming mains power
supply) of more than 100 A per phase and with a
supply voltage of 400/230 V. If necessary, the pow-
er supply company must be consulted to ensure
that the continuous current-carrying capacity at
the point of connection to the public grid is suffi-
cient for connection of such a unit.
– The fans and compressors in single- and three-
phase units are intrinsically safe (thermal winding
protection). This applies to special-voltage units
that are equipped with a transformer.
– Install the slow pre-fuse specified on the rating
plate (miniature circuit-breaker with "K" character-
istic, motor circuit-breaker or transformer circuit-
breaker) to protect the cable and equipment from
short-circuits. Select a suitable motor circuit-
breaker/transformer circuit-breaker in accordance
with the information specified on the rating plate:
Set it to the minimum specified value. This will
achieve the best short-circuit protection for cables
and equipment. Example: Specified setting range
6.3 – 10 A; set to 6.3 A.
4.5.3 Three-phase devices
– The three-phase version of types SK 3126.xxx
must be connected to a TN network using a motor
circuit-breaker with star earth point (setting current
as per rating plate). Three-phase units with special
voltages must be protected with a transformer
circuit-breaker (category AC-3) as per the rating
plate.
– Units designed for three phase 400/460 V feature
additional monitoring of the rotary field or the ab-
sence of a phase. If the rotary field is incorrect or a
phase is absent, the unit will not run.
RITTAL Compact split cooling unit assembly and operating instructions
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