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11. ELECTRICAL WIRINGS
11.1. ELECTRIC WIRING
• Before carrying out any work, switch off the
power supply to the air conditioner.
• All the parts and materials supplied on site
must comply with the local laws and regula-
tions.
• All the connection lines must comply with
the electrical wiring diagram. Incorrect con-
nection could cause the air conditioner to
malfunction or suffer damage. The wiring dia-
grams are subject to continuous updates, so
it is essential to use those on the machine as
your reference.
• The unit and its accessories must only be in-
stalled and wired by professionals with the
necessary technical qualifications in installa-
tion, conversion, extension and maintenance
of the systems and who are trained to per-
form operational and safety checks on these
systems. In this manual, these will generally be
referred to as “Personnel with specific tech-
nical skills”.
• In the specific case of electrical wirings, the
following must be checked:
− Measurement of the electrical system insula-
tion strength.
− Continuity of the protection wires.
• To protect the unit against short circuits,
mounted on the supply line of an thermo-
magnetic isolator switch (IG) with a minimum
contact separation of at least 3mm in all
poles. Respect the measurements given in
the table.
• Check the earth cable is connected to the
earthing system of the building itself.
• Ensure that the installation is wired in compli-
ance with the laws and standards in force,
and with the instructions in this manual.
• If the power supply cables, earth cables,
communication cables or wired panel ca-
bles are damaged, they must be replaced
with cables with the same specifications.
Have repairs carried out by “Personnel with
specific technical skills”.
• Follow the guidelines given in this manual to
determine the minimum cable section for the
supply cables, earth cables and communi-
cation cables.
• Ensure that the air conditioner is connected
to the power supply or to a power socket
with the correct voltage and frequency as in-
dicated on the data plate. Using power sup-
plies with the incorrect voltage and frequen-
cy could damage the unit and consequently
risk starting a fire. The voltage must be stable,
without major fluctuations.
• The available electric power should be suffi-
cient to supply the air conditioner.
• The power supply cable should be safe and
secure, in order to avoid damage caused by
pulling out the cable terminal.
• Do not make junctions on the power supply
cable: use a longer cable. Replacement
cables must have the same specifications.
Junctions can cause overheating and/or
fires. Have repairs carried out by “Personnel
with specific technical skills”.
• All the power supply lines must use terminals
with wire-end ferrules or single-wire terminals.
Stranded cables without wire-end ferrules
could cause electrical bridges.
• Do not leave any cables in contact with the
cooling pipe, the compressor or moving parts
such as the fans.
• Do not modify the circuits inside the air con-
ditioner. The manufacturer cannot be held
responsible for any damage or malfunction
due to incorrect line connections.
• Before accessing the terminals all of the pow-
er supply circuits need to be connected.
11.2. EARTH CONNECTION
• The air conditioner is a Class I electrical ap-
pliance, so it is essential to provide a reliable
earthing connection.
• The yellow and green wire in the air condi-
tioner and the earth wire cannot be used
for other purposes. The cable cannot be se-
cured with a screw through the wire as this
could result in an electric shock.
• The user must provide a safe earthing con-
nection. Check the earth cable is connected
to the earthing system of the building itself.
• Check a suitable differential switch is installed
for earthing electrical discharge. Do not con-
nect the earth cable to the following com-
ponents:
− Water pipes
− Gas pipes
− Drain pipes
− Lightning conductor
− Telephone earth cable
− Other locations considered unsafe by “Per-
sonnel with specific technical skills”.
11.3. CONNECTING THE POWER SUPPLY CABLE
(INDOOR UNIT)
• The power of the air conditioner must be con-
nected to the indoor unit. Observe the wiring
diagrams.
• Power cable:
− In case you need to replace the cable with
a longer one, use a cable with the features
shown in the table in this manual.
− To protect the unit against short circuits,
mounted on the supply line of thermomag-
netic isolator switch with a minimum contact
separation of at least 3mm in all poles.
• Connection cable between units: use a ca-
ble with the features shown in the table in this
manual.
• Connecting the multi-core cables:
− Use a wire stripper to remove the insulating
layer (10 mm long) from the end of the mul-
ti-polar cable.
− Using crimping pliers, fit a terminal (compat-
ible with the size of the control board) to the
end of each cable pole.
− Remove the screw from the unit control
board.
− Insert the terminal of the cable in the control
board, and fix it with the screw.
11.4. CONNECTING THE POWER SUPPLY CABLE
(OUTDOOR UNIT)
Connection between units:
• Remove the handle on the right side of the
outdoor unit.
• Remove the clamp.
• Attach the 3 phases and the neutral of the
cable to the control board as shown in the
wiring diagram.
• - Attach the ground wire to the screw marked
with the symbol as shown in the wiring di-
agram.
• - Tighten the screws firmly.
• - After tightening the screws, make sure the
wire is secure.
• - Secure the cable with the cable clamp.
• - Replace the handle on the right side of the
outdoor unit.
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