Mase Generators I.S. 6.5 Manuel D'installation page 21

of siphons. It's use obligatory when the base of
the generator group is under the water line,
and it must be positioned at least 30 cm. above sea
level. (see fig. 11).
Anti-siphon valve must be inserted
between the inlet of the sea water pump and mixing
elbow as indicated in Fig. 11
The drainage duct of the anti-siphon valve must run
beneath the valve itself in order to prevent water
accumulating in the duct, which should always remain
empty to allow air to pass through when the unit is
switched off. (see fig. 9)
It is recommended that the drainage pipe from the anti-
siphon valve be fed into the bilge, as small amounts of
water might be drained through it during normal operation.
The cooling circuit is connected to the heat exchanger
pipe fitting as shown in Figure 10.
4.6 Drainage system
The flue gas/water drainage system of the generator
must be separate from that of the main motors
The length of the tube from the
highest point of the drain duct to the muffler should
not exceed 2 metres. This is to prevent the water left
in the drainage duct returning to the motor after
filling the tank muffler, when the unit is turned off.
1 - Tank muffler.
This dampens the noise of the drainage and stops
the water flowing back towards the motor. The
muffler should be installed no less than 1 metre
away from the generator and positioned at a height
as per fig. 4/5.
2 - Silencer
This further reduces noise. It should be installed no
more than 1 metre from the sea drainage nozzle.
3 - Outboard drainage pipe.
This must be fitted in a position that is constantly
above sea level in all the vessel's possible conditions
of use.
I.S. 6.5
5 FUEL CIRCUIT
The unit is fed by diesel fuel through the tubes marked
"Fuel inlet"(fig. 12 ref. 2 ) and "fuel outlet" (fig. 12 ref.
3). This latter is used for the return of the excess fuel.
There is no need for filters in connections to the fuel tank,
since the unit already contains a fuel filter; however it is
advisable to fit a tap onto the fuel supply line downstream
of the tank and a single-acting valve (check valve) to
prevent the fuel system emptying for any reason. Use a
valve with a 50 millibar opening. (Max head 0.8 mt.)
The fuel pipes should be in hydrocarbon-resistant rubber,
of inner diameter 8 mm.
For further information, read the
engine instruction manual, supplied by the engine
manufacturer.
6 ELECTRICAL CONNECTIONS
6.1 Battery connection
To start off the unit an independent battery of 12V is
needed, capacity 70 Ah.
It should be connected to the terminal of the generator
(fig.12, rif.4) with cables of section 25 mm
distances of 5 metres and with cables of section 35 mm
for longer distances, and following the sequence of
operations described below:
- First connect the positive pole (+) of the battery to the
terminal marked with the symbol (+) on the generator.
- Then connect the negative pole (-) of the battery to the
terminal marked with the symbol (-) on the generator.
- Wipe the connections with special mineral grease to
protect against oxidation and corrosion.
The generator includes an electronic device to
automatically recharge the start-up battery, giving
15 A, at a voltage of 12 V, when fully charged.
Install the battery in a well-ventilated
area, away from the generator and from any device
which might produce heat or sparks.
Periodically check the state of the connections of the
terminals and the water level of the battery. If the cables
need to be disconnected, follow the instructions for
connection in reverse order.
Do not invert the poles of the connecting cables since
serious damage might be caused to the generator and
the battery.
Do not connect other loads to the battery.
In order to reduce galvanic currents to a minimum, the
(-) of the battery of the electric generator should not be
connected to the (-) of the other batteries on board.
- I.S. 7.6
50Hz 60Hz
up to
2
2
GB
GB
- 13