RG66001652_REV.02
23
LCW - LCR
ELECTRICAL CONNECTIONS
GENERALITIES
Before carrying out any job on electrical parts, make sure the power supply is
disconnected.
Check that the mains electricity supply is compatible with the specifications (voltage, number of phases,
frequency) shown on the unit rating plate.
The power connection for single-phase loads is to be made with a three-pole cable and “N” wire at the
centre of the star [optional: power supply w/o neutral].
The size of the cable and line protections must conform to the specifications provided in
the wiring diagram.
The supply voltage may not undergo fluctuations exceeding ±5% and the unbalance between phases
must always be below 2%.
The above operating conditions must always be complied with: failure to ensure said
conditions will result in the immediate invalidation of the warranty.
The electrical connections must be made in accordance with the information shown in the wiring diagram
provided with the unit and current regulations.
An earth connection is
mandatory
. The installer must connect the earthing wire using the earthing
terminal situated on the electric control board (yellow and green wire).
The power supply to the control circuit is shunted from the power line through an insulating transformer
situated on the electric control board.
The control circuit is protected by suitable fuses or automatic breakers depending on the unit size.
Electrical connections of circulation pump
For all LCW units a clean contact is provided on the electric board for powering a low-voltage remote
control used to start the pump.
If it is an integral part of the supply, the pump must be started before the chiller and
stopped after the latter (minimum recommended delay: 60 seconds). If it is connected to
the terminal in the electric control board, this function is carried out by the built-in
microprocessor.
