Manual code 75803707A.0708
Page 29 of 64
4.8 ELECTRICAL CONNECTIONS
WARNING!
BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN
SWITCH TO POSITION “O”
The external electrical connections of the air conditioner must satisfy the following prescriptions:
• They must be suitably dimensioned to withstand the maximum load in Amperes indicated on the electrical
wiring diagram and on the data plate located inside the electrical compartment of the unit itself.
• The power supply must be within the following limits in order to avoid possible malfunction of the installed
components:
o Voltage tolerance limits: ± 10%
o Frequency tolerance limits: ± 2%
• The power supply line from the external thermal-magnetic circuit breaker with Residual Current Device to the
machine must be direct without any interruptions or junctions.
• A Residual Current Device with thermal-magnetic circuit breaker, the installation of which is responsibility of
the Customer, is essential in order to provide overcurrent protection on the supply line (Articles 7.2.1 and
7.2.6 of standard CEI EN 60204-1), and must be located as near as possible to the machine. The thermal
magnetic circuit breaker must be equipped with a residual current device (RCD) with a trip settings of 30 - 300
mA to provide protection for persons against both indirect and direct contact, in addition to thermal and
magnetic overload protection. The RCD serves also to protect the air conditioner against insulation failure.
• The earth connection must be made with a conductor having the minimum cross-section indicated in the
wiring diagram.
• To prevent operating problems with the microprocessor controls, it is necessary that no other loads (pumps,
condensers, etc.), even those that are part of the same system, are connected downstream of the main
switch of the air conditioner, unless explicit permission is granted by TECNAIR LV. If this condition cannot be
met, it will be necessary to connect suppressors (R + C) in parallel with the coils of the relays of any such
loads.
• The signal/control cables must be kept separate from high-current cables, power cables and any cables that
are potential sources of electromagnetic interference.
• To avoid possible damage to electrical and electronic equipment caused by voltage surges in the electrical
supply line, TECNAIR LV recommends evaluating the necessity of installing SPDs (Surge Protection Devices)
appropriately rated for the type of installation and the frequency of direct lightning strikes on the electrical
supply line.
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