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8 - ELECTRICAL CONNECTION
8.1 - Installation norms
Important: All connections in the site are the responsibility
of the installer. These connections are always made as
per the current regulation. Always refer to the wiring
diagram provided with the unit.
To prevent electrical shocks, make all electrical
connections before energizing the unit. Check that the
automatic switch is closed. Omitting this can cause
personal damage. Make the ground connection before
any other electrical connection.
The installer must provide electrical circuit protections
according to the eff ective legislation.
Example:
On a 400 V - 3 ph - 50 Hz power supply, the individual phase
voltages were measured with the following values:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406+399+394)/3=1199/3 = 399.7 i.e. 400 V
Calculate the maximum deviation from the 400 V
average:
(AB) = 406 - 400 = 6 -> % = 100 x 6 / 400=1.5
(BC) = 400 - 399 = 1 -> % = 100 x 1 / 400=0.25
(CA) = 400 - 394 = 6 -> % = 100 x 6 / 400=1.5
Moteur
Motor
Important: It is the responsibility of the installer to protect the unit
from overvoltage coming from the mains or voltage spikes caused
by lightning. Depending on the geographic location and the type
of mains network (buried or overhead), a lightning rod needs to
be installed. Check the local electrical codes and regulations.
Failure to comply with the requirements of standards in force in
the country of installation will void the warranty.
Power cable access routing
The power cables can be routed into the electrical box via the
wall bushings located:
■ In models 100 to 170: in a left panel below the electrical cabinet
or in the machine base.
■ In models 180 to 280: below the electrical cabinet (left door).
It is important to check that the power cable bend radius is
compatible with the connection space available inside the electrical
cabinet.
8.4 - Electrical cabinet
All units include a fully wired electrical cabinet, with forced
ventilation. The access doors are insulated to prevent condensation.
8.3 - Wire sizing
Wire sizing is the responsibility of the installer to suit the
characteristics of the installation site and comply with applicable
regulations.
To perform the electric installation of the unit (cable glands,
wire sizing and their calculations, protections, etc.), refer to the
information provided in:
■ The technical brochure of this series.
■ The name plate data.
■ The wiring diagram included with the unit.
■ Norms in eff ect that regulate the installation of air conditioning
units and electrical receivers in the country of installation.
Wiring must be selected based on:
■ The maximum absorbed current, taking into account all the
options it features (refer to the technical brochure and the
name plate).
8.2 - Power supply
Verify that power supply agrees with the unit name plate and that
the voltage remains constant.
Warning: It is recommended the use of a residual current device
(RCD) type B or B+, with a trip threshold of 300 mA and super
resistant characteristic K.
Warning: Operation of the unit with an incorrect supply voltage
or excessive phase imbalance constitutes misuse which will
invalidate the manufacturer’s warranty. If the phase imbalance
exceeds 2% for voltage, or 10% for current, contact your local
electricity supplier at once and ensure that the unit is not switched
on until corrective measures have been taken.
Voltage phase imbalance (%)
% imbalance =
100 x max. deviation from average voltage
average voltage
Models 100 to 170:
Electric
cabinet
Electric
power
supply
inputs
OT125 70 mm
2
wire size for
fl ange clamp
OT160EV_ M8x25
metric thread
diameter
x length mm
OT200E_ M8x25
OT250_ M8x25
OT315_ M10x30
OT400_ M10x30
OT630_ M12x40
Note: If an adapter to increase this wire sizing is needed, please
consult.
■ The distance between the unit and its power source.
■ The protection to be placed at the power source.
■ Neutral operating conditions.
■ The electrical connections (refer to the wiring diagram provided
with the unit).
■ The temperature the wiring is exposed to;
■ The fi tting method.
After wire sizing has been completed, the installer must verify the
appropriate means of connection and defi ne any modifi cations
necessary on site.
Maximun wire sizing depending on the main door switch:
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