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5) Tighten the rear screws fully down on Nettuno.
6) The bracket is designed for fixture of various sizes of “U-shaped” hooks,
refer to the diagram to select the correct version.
HYDRAULIC CONNECTION
The 4÷20mA pressure sensor must be connected to the system delivery, preferably far from areas subject to turbulence (bends, bypasses,
branches, etc.) to ensure optimal stability of the measured signal.
It is a compulsory requirement to install an expansion tank with a capacity of at least 2-5 litres to ensure correct shutdown of the pump
and limit restarts caused by any small leakages which are common in most systems.
The pre-charge value of the tank must be suitable for the pressure values set. This will also help to keep the operation constant in
applications where water requirements are modest (e.g. for washing machines, toilet flushing systems, etc.).
The system must also be equipped with a non-return valve to prevent the return of fluid to suction at the time of pump shutdown. In the
case of multiple installations, it is recommended to install a valve on suction for each pump.
CAUTION: when the pump stops, the conduits are still pressured so a valve must be opened to bleed the system before any work is
carried out.
INSTALLATION IN PUMPING UNITS WITH MULTIPLE PUMPS:
Nettuno
can be used to create pressurisation units with a maximum of 8 pumps, each controlled by an inverter. The inverters are connected
by means of a RS 485 serial connection. Each inverter is assigned an address, from 1 to 8, for identification in the serial bus. To reduce
costs, there is no need to install a pressure sensor for each inverter; a single transducer is sufficient, connected to any one of the inverters
(the address of the device hosting the pressure sensor must be configured on the software of each inverter). Also any auxiliary 0-10 V
control or digital input signal must be connected to a single device. Serial communication deals consists in sharing the data of the pressure
sensor and digital inputs among the various connected inverters.
RS 485
PRESSURE SENSOR
RS 485
DIGITAL INPUTS
(FLOAT, TIMER, ETC.)
ADDRESS 1
ADDRESS 2
ADDRESS 8
2” ½
1” ¼
1” ½
2”
