4 Assembly and connection
Rittal air/water heat exchanger assembly instructions
11
EN
4.6 Notes on electrical installation
When performing the electrical installation, it is impor-
tant to observe all valid national and regional regula-
tions 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
standards and regulations.
4.6.1 Connection data
– The connected voltage and frequency must cor-
respond to the values stated on the rating plate.
– The air/water heat exchanger 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 cited on the rating plate
(miniature circuit-breaker or gG/(gL) fuse) to
protect the cable and equipment from short-
circuits.
– The mains connection must ensure low-noise
potential equalisation.
4.6.2 Overvoltage protection
and supply line load
– The unit does not have its own overvoltage protec-
tion. 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%.
– The fans in single-phase units are intrinsically safe
(thermal winding protection). The same also
applies to all transformer versions and to special-
voltage units which are likewise equipped with
a transformer.
4.6.3 Door limit switch
(e-Comfort controller only)
– Each door limit switch must only be assigned to
one air/water heat exchanger.
– Several door limit switches may be connected
in parallel and operated on one air/water heat
exchanger.
– The minimum cross-section of the connection
cable is 0.3 mm
2
for a cable length of 2 m.
We recommend the use of a shielded cable.
– The line resistance to the door limit switch must
not exceed a maximum of 50
1
.
– The door limit switch only supports a floating
connection; no external voltages.
– The contact of the door limit switch must be closed
when the door is open.
The safety extra-low voltage for the door limit switch
is provided by the internal power pack: current
approx. 30 mA DC.
Connect the door limit switch to terminals 1 and
2 of the connector.
The door limit switch is available as an accessory
(Model No. 4127.010).
4.6.4 Potential equalisation
Rittal recommends connecting a conductor with
a nominal cross-section of at least 6 mm
2
to the
potential equalisation connection point on the air/
water heat exchanger and incorporating it into the
existing potential equalisation system.
According to the standard, the PE conductor in
the mains connection cable is not classified as an
equipotential bonding conductor.
4.6.5 Installing the power supply
Complete the electrical installation in accordance
with the wiring plan to be found on the rear of the
air/water heat exchanger.
For devices 3363.XXX and 3364.XXX in special
voltage variants, an external transformer is re-
quired (see also Rittal system accessories).
To be able to evaluate the system messages of the
air/water heat exchanger via the system message
relay, a corresponding low-voltage cable must be
connected additionally on terminals 3 – 5.
