Electrical Connection; Installation Norms; Power Supply; Wire Sizing - Carrier 50FF 020-093 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 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 (%)
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
(BX) = 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 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 power input, taking into account all the options
average voltage
Motor Moteur
it features (refer to the technical brochure and the name
plate).
- 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:
wire size for
OT125 70 mm
2
fl ange clamp
OT160EV_ M8x25
OT200E_ M8x25
metric thread
OT250_ M8x25
diameter
OT315_ M10x30
x length mm
OT400_ M10x30
OT630_ M12x40
Note: If an adapter to increase this wire sizing is needed, please
consult.
Power cable access routing
The power cables can be routed into the electrical box for the units:
■ Via the panel located under the electrical cabinet.
■ Via the base of the unit.
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 door is insulated to prevent condensation. This door
has hinges + quarter-turn latches.
Quater-turn latch
Openable window
of access to the
terminal
Main door switch
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