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5.8
ELECTRICAL CONNECTIONS
Check that the power supply matches the unit’s electric nominal data (voltage, phases, frequency) displayed on the rating plate
on the unit’s side panel. The electric power connections must be made in accordance to the wiring diagram enclosed with the
unit and in conformity with national and international standards (providing general circuit breaker, residual current devices for
each line, proper earthing of the plant, etc.).
CAUTION: Before starting any operation, make sure that the power supply is disconnected.
CAUTION: The electric panel is positioned below the cover. Respect the minimum clearances shown in chapter 5.3
to perform wiring.
CAUTION: The installer is responsible for the disconnection system (e.g. general circuit breaker) upstream of the
electrical connections of the unit.
CAUTION: The supply voltage’s fluctuations cannot exceed ±10% of the nominal value. If this tolerance should not
be respected, please contact our technical department. The power supply must comply with the limits mentioned,
otherwise the warranty will expire immediately.
CAUTION: If the supply cable is damaged, it must be replaced by qualified personnel, in order to prevent any risk
CAUTION: The flow switch (element B in the previous hydraulic diagram and installed in the factory) must ALWAYS
be connected following the indications given in the electrical diagram. Never bridge the flow switch connections in
the terminal block. The warranty will no longer be considered valid if the flow switch connections have been
altered or incorrectly connected.
CAUTION: The remote control panel is connected to the chiller by 4 cables with a cross-section of 1.5 mm
2
. The
power cables must be separate from the remote control cables. Maximum distance 50 metres.
CAUTION: The remote control panel cannot be installed in an area with strong vibrations, corrosive gases,
excessive filth or high humidity. Leave the area near the chiller clear.
5.8.1
Access to the electric panel
The following is the procedure to remove the cover. The images show sizes 14/16 but they also apply to the other sizes.
1.
Undo the screws which secure the cover. Two on each side of the
machine and two which secure the cover to the support of the cable
glands. (There is just one fixing screw on the side of the smaller-sized
controllers).
2.
Remove the screws that fasten the cover of the electric panel and
wire to the terminal block.
3.
Insert the cable in the cable glands on the side of the machine to
bring them outside of the unit.
4.
Close the electric panel and the cover of the machine by reapplying
the screws.
The above-mentioned operations must be carried out with
the machine off and power disconnected (by means of the
specific disconnector applied by the installer).
Operations carried out by qualified personnel.
Remove the cover without removing the support plate of the
cable glands.
When the work is finished, close all of the removed covers
applying the screws and gaskets (if included).
5.8.2
Power supply terminal block
The electrical wiring to the terminal blocks has to be done only by qualified personnel.
Make sure to install an adequate ground connection, incomplete grounding can cause electric shock. The
manufacturer cannot be held responsible for any damage caused by failure or ineffective earthing.
