INSPY. 1003. 4138305_03
82
21. ELECTRICAL WIRINGS
The default NS chillers are completely
wired and only need the connection
to the power supply net, downstream
to a group switch, according to the to
the regulations in force in the country
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 consideration
any other equipment that may be
operating at the same time.
− The unit is only powered after the
last (hydraulic and electric) installa-
tions.
− Follow the connections instruc-
tions of the phase conductors, and
earth.
− The power line will have a special
protection upstream against short
circuits and earth losses that sec-
tions the system according 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 parameters are not respect-
ed, 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.
21.1. RECOMMENDED SECTION OF
ELECTRIC CABLES
The cable sections indicated in the ta-
ble are advised for a maximum length
of 50 m.
For higher lengths or different types
of cable installation, it will be the
DESIGNERS responsibility to carefully
measure the line main switch, the
supply power line and the earthing
protection connection, and the work-
ing connection cables:
− the length
− the type of cable
− Absorption of the unit and its physi-
cal position, and room tempera-
ture.
WARNING:
Check that all power cables are cor-
rectly secured to the terminals when
switched on for the fi rst time and after
30 days of use. Afterwards, check the
connection of the power cables every
six months.
Slack terminals could cause the ca-
bles and components to overheat.
21.2. CONNECTION TO THE POWER
SUPPLY
− Check there is no voltage on the elec-
tric line you want to use.
21.2.1. To access the
electric box:
−Turn ¼ the screws of the electrical
panel in counter-clockwise direc-
tion
− Turn the handle of the door-block
disconnecting switch to OFF (see
figure). In this way, the electrical
panel can be accessed
21.3. ELECTRICAL POWER CONNECTION
For functional connection of the
unit take the supply power cable to the
electrical panel inside the unit in the
previous page and connect it to the
disconnecting switch terminals observ-
ing the phase, and the earth.
NOTE
Models from 5002 to 7203 A / E have
two electrical boxes, a front side com-
pressor unit and a heat exchanger
finned coil. At the site, we connect the
supply power and earth connection.
(fig.. Also in the models from 5702 to
7203 A - E, that are sent separately, at
the moment of installation, it is neces-
sary to put the two units in network
by connecting the two PC03 MASTER
SLAVE 1 on the electrical box of the
double module with that of SLAVE 2 in
the electrical box of the single module
(see figure) using exclusively
a shielded AWG20/22 cable made of
a twisted pair and a shielding for com-
munication standard RS485. The cards
are connected in parallel referring
to terminal clamp J11. Respect the
network polarity: RX/TX+ of one card
must be connected to RX/TX+ of the
other card and the same thing for the
RX/TX-.
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 wiring. The machine should only be powered once the hydraulic and
electric operations are completed.
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