22. ELECTRICAL WIRINGS
NXW chillers are completely wired in the
factory and only need the connection
to the electricity mains supply, down-
stream from a group switch, according
to the regulations in force in the coun-
try where the machine is installed.
It is also suggested to check:
− the mains supply characteristics,
to ensure it is suitable for the levels
indicated in the electrical data
table, also taking into considera-
tion any other equipment that may
be operating at the same time.
−
The unit is only powered after the
last (hydraulic and electric) instal-
lations.
− Follow the connections instructions
of the phase conductors, and earth.
− The power supply line will have
a special protection upstream
against short circuits and earth
losses that sections the system ac-
cording to other users.
− The voltage should be within a
tolerance of ± 10% of the rated
supply voltage of the machine (for
Three-phase units displacement max
3% between the phases). If these pa-
rameters are not respected, contact
the energy supplier. For electrical
wirings use isolated double cables
according to the standards in force
in the different countries.
− It is necessary to use a omnipolar
thermomagnetic switch, in compli-
ance with the CEI-EN standards
(contact opening of at least 3
mm), with adequate switch capa-
bility and differential protection
based on the followed electrical
data table, installed as close as
possible to the machine.
− It is necessary to carry out an effi-
cient earth connection. The manu-
facturer can not be held responsi-
ble for any damage caused by the
failure and ineffective earthing of
the machine.
− For units with Three-phase power
check the correct connection of
the phases.
WARNING:
It is forbidden to use water pipes for
the earthing of the machine.
22.1. RECOMMENDED SECTION OF
ELECTRIC CABLES
The cable sections indicated in the ta-
ble are advised for a maximum length
of 50 m.
All electrical operations must be carried out BY QUALIFIED PERSONNEL, IN
ACCORDANCE WITH THE CORRESPONDING REGULATIONS, trained and in-
formed about the risks related to such operations.
The characteristics of electric lines and related components must be estab-
lished by PERSONNEL AUTHORISED TO DESIGN ELECTRIC INSTALLATIONS, fol-
lowing international regulations and the national regulations of the country
in which the unit is installed, in compliance with the legislative regulations in
force at the moment of installation.
For installation requirements, the wiring layout supplied with the unit must
be compulsory referred to. The wiring layout together with the manuals
must be kept in good conditions and readily ACCESSIBLE FOR FUTURE OP-
ERATIONS ON THE UNIT.
IT is compulsory to check the machine sealing before connecting the elec-
trical wirings. The machine should only be powered once the hydraulic and
electric operations are completed.
KEY
Sec. A: Power supply
Sec. B: Controls and safety connection
Earth
IL: Main switch
ELECTRICAL DATA VERSION ° WITHOUT PUMPING GROUP
(ALL VERSIONS)
Model
MAX
RECOMMENDED
LENGTH
(metres)
SECT. A
(400V-3)
SECT.B
EARTH
(400V-3)
IL
(400V-3)
U.M. U.M. U.M. U.M.
mm
2
mm
2
mm
2
A
NXW 0500
50
16
1.5
16 80
NXW 0550 16 16 100
NXW 0600 25 16 100
NXW 0650 25 16 125
NXW 0700 35 16 160
NXW 0750 50 25 160
NXW 0800 70 35 200
NXW 0900 70 35 200
NXW 1000 70 35 250
NXW 1250 95 50 250
NXW 1400 95 50 250
48
INXWPY. 1004. 4438805_00
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