Electrical Connection; Installation Norms; Power Supply; Wire Sizing - Carrier 50NC Series Installation, Operation And Maintenance Instructions

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.
The installer must provide electrical circuit protections
according to the eff ective legislation.
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.

8.2 Power supply

Verify that the power supply agrees with the unit's nameplate
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 (%)
100 x max. deviation from average voltage
% imbalance =
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
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.

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 nameplate 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.
average voltage
Motor Moteur
Wiring must be selected based on:
● The maximum power input, taking into account all the options
it features (refer to the technical brochure and the nameplate).
Important: Short-circuit current: 15 kA according to IEC/EN
60947-2.
● 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.
Maximum wire sizing depending on the main door switch:
wire size for
OT125 70 mm
2
fl ange clamp
OT160EV_ M8x25
OT200E_ M8x25
metric
OT250_ M8x25
thread
diameter
OT315_ M10x30
x length mm
OT400_ M10x30
OT630_ M12x40
Note: Copper cable is recommended. If the unit needs to be
adapted for an aluminium installation, please consult.
Note: If an adapter to increase this wire sizing is needed, please
consult.

8.4 Electric cabinet

Outdoor module
All units include a fully wired electrical cabinet. The access door
is insulated to prevent condensation. This door has hinges +
quarter-turn latches.
Electrical
cabinet
Window
of access
to graphic
terminal
Door switch
These latches of stainless steel have triangular
insert 8 mm (supplied wrench). The closing is done
by rotating 90º (anti-clockwise): it brings the latch
to the locked position.
Electric power
supply inputs
17