22
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- ELECTRICAL CONNECTIONS -
GENERAL
IMPORTANT
- BEFORE PERFORMING ANY OPERATIONS ON THE ELECTRICAL SYSTEM, MAKE SURE THAT THE POWER SUPPLY TO
THE UNIT IS ISOLATED AT THE SOURCE.
- FOR ALL OPERATIONS DESCRIBED IN THIS MANUAL, OR IN ANY CASE INVOLVING THE ELECTRICAL SYSTEM, REFER TO
THE WIRING DIAGRAM ENCLOSED WITH THE UNIT; THE CODE OF THE WIRING DIAGRAM IS SHOWN ON THE RATING
PLATE LOCATED IN OR NEXT TO THE ELECTRICAL PANEL.
- THE WIRING DIAGRAM, TOGETHER WITH THIS MANUAL, MUST BE KEPT WITH CARE AND MUST BE MADE AVAILABLE
FOR FUTURE OPERATIONS ON THE UNIT.
- ALL ELECTRICAL CONNECTIONS MUST BE PERFORMED BY PERSONNEL WITH THE NECESSARY LEGAL REQUISITES.
PRELIMINARY OPERATIONS
- Open the main isolator switch.
- If no main isolator switch is
present, check that the isolator device at the origin of the unit’s power supply line is open,
padlocked and fitted with a special sign.
- Check that the characteristics of the mains power conform to the data shown on the rating plate located inside the electrical panel.
CONNECTING THE MACHINE TO THE MAINS POWER SUPPLY
Identify, with the help of the machine’s wiring diagram, the power cable connection terminals L1 - L2 - L3 (N, where present) and the
earth cable connection terminal. (L-N in units with single-phase power supply).
Rate the electrical cut-out devices according to the rules of good practice prescriptions, based on the machine’s electrical data
contained in the technical bulletin, in this manual, and on the machine’s rating plate*.
Size the cross-section of the power cables and earth cable, according to the rules of good practice and the standards in force, based
on the characteristics of the cut-out devices used.
CAUTION:
- The correct sequence of the phases L1, L2, L3 must be followed. Failure to follow the correct sequence may lead, when the machine
is started, to serious malfunctions.
- Before powering the unit, check that all the cut-out devices removed during the electrical connection work have been replaced.
* The presence of any accessories not envisaged on the standard units may change, even slightly, the machine’s electrical data as
shown in the technical bulletin (this in fact refers to the standard unit). For this reason, in the event of discrepancies between the data
on the rating plate and the data provided in this manual or in the technical bulletin, the data on the rating plate must be considered.
FUNCTIONAL CONNECTIONS
IMPORTANT
Refer to the machine’s wiring diagram to identify the terminals and the function of the various connections.
- REMOTE ON/OFF CONTROL
The unit is fitted for connection to a remote device for switching the machine on or off, such as a switch, timer or the contact of a
device in a centralised supervisory system.
The contact must be suitable for the switching of low power loads and voltage free (free contact).
Electrical Connections
The unit’s supply line protection device must be able to cut-off power in the event of an assumed short-circuit, the value of which must
be determined by personnel authorised for design of electrical systems, in accordance with the characteristics of the system.
- CONNECTING THE WATER PUMP CONTROL
If the unit is ordered without an on-board pump, it is fitted for the control of the water pump contactor (free contact, max 24V 1A). This
power must be taken from a transformer with separate primary and secondary windings that complies with the standards in force. The
maximum rated current is 1.1A in Ac11.
The control module manages the operation of the pump with safety logic (different on/off times for the pump and compressor, and
management of the safety devices on the water side).
N.B.
For connection to a CLIVET pumping assembly, the water pump is controlled at 230V, therefore, in the event of
maintenance, isolate both electrical panels. This is an important warning for the safety of the operator.
- FLOW SWITCH/WATER DIFFERENTIAL PRESSURE SWITCH
This is a safety digital input that must be connected to the water flow control device/devices. The standard devices are:
a) A flow switch, fitted with an NO voltage-free contact (open when there is no water flow)
b) A water differential pressure switch, fitted with an NO voltage-free contact (open when there is no pressure difference between the
exchanger inlet/outlet)
If the unit is ordered without an on-board pump, these devices should be fitted in series with a NO contact on the water pump remote
control switch.
IMPORTANT: The installation and correct connection of the water flow control devices is fundamental for the operating safety of the
machine. These devices are necessary even if the unit is already fitted with an internal water differential pressure switch.
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