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6.8 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.).
Before beginning any type of operation, make sure that power is disconnected.
CAUTION: The electric panel is positioned below the cover. Respect the minimum clearances shown in chapter 6.3
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 the electricity provider. The power supply has to respect the listed limits: failing this,
the warranty will terminate 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 FL in the previous plumbing diagram and installed at the factory) must
ALWAYS be connected according to the indications in the wiring diagram. Never jumper the connections of the
flow switch in the terminal block. The warranty will no longer be considered valid if the connections of the flow
switch have been altered or connected improperly.
CAUTION: The remote control panel is connected to the water chiller by means of no.4 twisted shielded wires
having a 1,5 mm
2
section, plus the Modbus ground conductor (eg CAT5 STP cable, connect the shield to ground at
one end of the cable. The power supply cables have to be separated from the remote control wires. The maximum
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.
6.8.1 Access to the electric panel
The following is the procedure to remove the cover. The images show sizes 140R/RK - 160RT/RTK - 180RT/RTK 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 c
over 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).
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