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4.20 Electric connections: preliminary safety information
The electric panel is located inside the unit at the top of the technical compartment where the various components of the refrigerant circuit
are also to be found. To access the electrical board, remove the front panel of the unit:
Power connections must be made in accordance to the wiring diagram enclosed with the unit and in accordance
to the norms in force.
Make sure the power supply upstream of the unit is (blocked with a switch). Check that the main switch handle is
padlocked and it is applied on the handle a visible sign of warning not to operate.
It must be verified that electric supply is corresponding to the unit electric nominal data (tension, phases, fre-
quency) reported on the label in the front panel of the unit.
Power cable and line protection must be sized according to the specification reported on the form of the wiring
diagram enclosed with the unit.
The cable section must be commensurate with the calibration of the system-side protection and must take into
account all the factors that may influence (temperature, type of insulation, length, etc.).
Power supply must respect the reported tolerances and limits: If those tolerances should not be respected, the
warranty will be invalidated.
Flow switches must be connected following the indication reported in the wiring diagram. Never bridge flow
switches connections in the terminal board. Guarantee will be invalidated if connections are altered or not properly
made.
Make all connections to ground provided by law and legislation.
Before any service operation on the unit, be sure that the electric supply is disconnected.
The power line and the unit external safety devices must be sized in order to ensure the correct voltage at the
maximum operating conditions of the unit reported in the wiring diagram of the unit.
FROST PROTECTION
If opened, the main switch cuts the power off to any electric heater and antifreeze device supplied with the unit, in-
cluding the compressor crankcase heaters. The main switch should only be disconnected for cleaning, maintenance
or unit reparation.
30
Rev. A 11-2020
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