23. ELECTRICAL
WIRINGS
The default NRL 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)
installations.
−
Follow the connections instructions
of the phase conductors, and
earth.
−
The power line will have a special
protection upstream against
short circuits and earth losses that
sections 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 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
compliance with the CEI-EN
standards (contact opening of
at least 3 mm), with adequate
switch capability 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
efficient earth connection. The
manufacturer can not be held
responsible 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.
23.1. RECOMMENDED SECTION OF
ELECTRIC CABLES
The cable sections indicated in the
table 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
informed about the risks related to such operations.
The characteristics of electric lines and related components must be
established by PERSONNEL AUTHORISED TO DESIGN ELECTRIC INSTALLATIONS,
following 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
OPERATIONS ON THE UNIT.
It is compulsory to check the machine sealing before connecting the
electrical wiring. The machine should only be powered once the hydraulic
and electric operations are completed.
KEY
Sec. A:
Fuel feed
Terra
IL:
Main switch
Cable sections
recommended
max. length: 50m
NRL BASE
2800
3000 3300
3600
No. power supplies
1
1
1
1
Versions
00
00
00
00
(no. conductors -
sect.) for each phase
SECT. A
400V-3 mm
2
3x240 3x240 4x185 4x185
Earth
400V-3 mm
2
2x185 2x185 2x185 2x185
IL
400V-3
A
800
800
800
800
Cable sections
recommended
max. length: 50m
NRL WITH PUMP
2800
3000 3300
3600
No. power supplies
1
1
1
1
Versions
with
hydronic
kit
with
hydronic
kit
with
hydronic
kit
with
hydronic
kit
(no. conductors -
sect.) for each phase
SECT. A
400V-3 mm
2
3x240
3x240
4x185
4x185
Earth
400V-3 mm
2
2x185
2x185
2x185
2x185
IL
400V-3
A
800
800
800
800
43
INRLPY. 02.10 4086916_01
Summary of Contents for NRL
Page 2: ......
