4.7
Electrical Supplies
Ensure that the power supply is off before
working on the electrical system.
The unit must be provided with an earth
connection.
It is the installers responsibility to ensure that
all external wiring complies with applicable
safety regulations.
York is not responsible for injury or damage of any
kind resulting from failure to observe these
precautions.
The unit complies with EN 60 439-1 of 1998.
The following connections are required:
n
One three-phase line and earth for the power
circuit supply.
The electrical distribution system must be able to supply
all the unit power, refer to Section 9.
The disconnect switches and circuit breakers must be
sized to handle the unit starting current, refer to
Section 9.
Supply and isolating devices shall be designed so that
the lines are fully independent.
Magnetic thermal differential breakers are
recommended, to prevent damage due to electrical
phase loss.
Power supplies to the compressors and the fans are
through contactors controlled by the control panel.
Each motor is provided with an internal thermal overload
cut-out and external fuses.
Supply cables should be routed through the cable
entries on the unit front and enter the electrical panel
through a hole at the bottom of the panel.
4.8
Electrical Connections
The installation of the unit on the final site must be
carried out according to the Machinery Safety
Directive (98/37/EC), to the Low Voltage Directive
(73/23/EEC), to the Electromagnetic Interference
Directive (89/336/EEC) as modified by Directive
(92/31/EEC) and according to normal rules for
technical matters prescribed by the applicable
country regulations. Do not operate the unit before
having observed all the above. Supply lines shall
consist of insulated copper conductors sized for
maximum current draw.
Terminal connections should be made in accordance
with the connection diagram in this manual and the
diagram supplied with the unit.
Before connecting the supply lines, check that
the mains voltage is within the range shown in
the Electrical Data in Section 9.
For the 3 phase power supply, also check that the phase
unbalance does not exceed 2%. The check is
performed by measuring the difference between the
voltage of each phase pair and the average mains
voltage during operation. The maximum measured
difference (unbalance) shall not exceed 2% of the
average voltage.
If the unbalance is unacceptable, the electricity supply
company must be asked to correct the fault.
Supplying the unit with a line whose
unbalance exceeds the specified value will
automatically void the warranty.
(09/03)
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035B09012-100 Rev. 4
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