VLS-GB.indd 17
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Installation
4.6 Power supply
Before carrying out any operations on the
electrical system, make sure that the unit is
deenergised.
It is important that the appliance is
grounded.
The company in charge of the installation
shall conform to the standards applicable to
outdoor electrical connections.
The manufacturer may not be held liable for any da-
mage and/or injury caused by failure to comply
withthese precautions.
The unit conforms to EN 60204-1.
The following connections shall be provided:
A 3-phase and grounding connection for the po-
wer supply circuit.
The electrical distribution system shall meet the po-
wer absorbed by the appliance.
The disconnecting and magnetothermal switches
must be sized to control the starting current of the
unit.
The power supply lines and the insulation devices
must be designed in such a way that every line in-
dependent.
It is recommended to install differential switches,
to prevent any damage caused by phase drops.
The fans and compressors are supplied through
contactors controlled from the control panel.
Each motor is provided with an internal safety ther-
mal device and external fuses.
The power supply cables must be inserted into de-
dicated openings on the front of the unit, and the
will enter the electrical board through holes drilled
on the bottom of the board.
4.7 Electrical connections
The unit must be installed on site according
to the Machinery Directive (2006/42/EC), the
Electromagnetic
Compatibility
Directive (2014/30/EU) and the usual
procedures and standards applicable in the
place of installa-tion. The unit must not
be operated if its installation has not been
carried out according to the instructions
provided in this manual.
The power supply lines must consist
of
insulated
copper
conductors,
dimensioned for the maximum ab-sorbed
current.
Connection to terminals must be performed accor-
ding to the diagram of connections (User’s Terminal
Box) provided in this manual and according to the
wiring diagram which accompanies the unit.
Before connecting the power supply lines,
check that the available voltage value
does not exceed the range specified in the
Electric Data (Chapter 8).
For 3-phase systems, check also that the unbalance
between the phases does not exceed 2%. To per-
form this check, measure the differences between the
voltage of each phase couple and their mean value
during operation. The maximum % value of these
differences (unbalance) must not exceed 2% of the
mean voltage.
If the unbalance is unacceptable, contact the Energy
Distributor to solve this problem.
Supplying the unit through a line whose un-
balance exceeds the permissible value will
automatically void the warranty.
DANGER
DANGER
WARNING
WARNING
WARNING