8 Handling instructions
Page 9
of
13
Rittal cooling unit assembly and operating instructions
Figure 12: Mounting cooling units
8.2
Electrical connection
When performing electrical installation, shall comply
with national and local institute There are existing
regulations and provisions of the local power supply
bureau. Electrical safety. Installed by qualified elec-
trician, electrician must comply with the current stan-
dards and regulations. Connect the power supply
cable according to the power supply tension as
shown on the name plate by following the instruc-
tions below:
Figure 13: Electrical connection
8.2.1
Connection data
The connected voltage and frequency must cor-
respond 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 to
protect the cable and equipment from short-
circuits
The mains connection must ensure low-noise
8.2.2
Overvoltage protection and power
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 lightning
and overvoltage protection. The mains voltage
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
electricity supply company must be consulted to
ensure that the continuous current-carrying ca-
pacity at the point of connection to the public grid
is sufficient for connection of such a unit.
The fans and compressors in single- and three-
phase units are intrinsically safe (thermal winding
protection). This also applies to transformer ver-
sions, types 3370.420, 3370.520, 3370.724 and
to special-voltage units which are likewise
equipped with a transformer.
Install the slow pre-fuse specified on the rating
plate (miniature circuit-breaker with appropriate
characteristic
– e.g. “K” characteristic – or gG
standard type slow fuse, circuit-breaker for plant
or transformer protection) to protect the cable
and equipment from short-circuits. Select a suit-
able circuit-breaker in accordance with the infor-
mation 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.
9
Inspection and maintenance
The cooling circle is designed in the form of a main-
tenance-free, hermetically sealed system. The cool-
ing unit is filled with the required quantity of refrige-
rant at the factory, checked for leaks, and subjected
to a functional test run.
The installed maintenance-free fans are mounted on
ball bearings, protected against moisture and dust.
The life expectancy is at least 30,000 operating
hours. The cooling unit is thus largely maintenance-
