Nanni QLS 65T, User Manual

Page: 37 / 80

37
S07 STARTING & RUNNING
BEFORE STARTING
GENSET INSTALLATION
Genset installation is very similar to most of the
propulsion engines on the market. There are only two
major differences which are :
1. The genset engine is linked to a sizeable alternator
(Single phase, or Star/Delta), instead of being linked to a
propulsion system.
2. Engine rev (rpm) is not adjustable. The speed is of
1500 rpm (50 Hz), or 1800 rpm (60 Hz).
The situation differs for small portable gasoline gensets,
not in the scope of this manual.
FUEL SYSTEM
The fuel is drawn from the tank by the fuel feed pump
and is injected into the combustion chamber by the
injection pump. A fuel filter is placed between the feed
pump and the injection pump.
The injection pump delivers a larger amount of fuel than
required for combustion. The fuel that is not burned is
re-injected into the tank through an over-flow pipe.
CAUTION !
The injection pump is an extremely precise unit. Water
entry in the fuel system will cause major failure to the
injection pump and to the whole fuel system.
A fuel prefilter with a water separator should be installed
between the fuel tank and the fuel filter on the engine.
The prefilter should be installed as close as possible to
the engine fuel filter. It must never be installed on the
engine as vibrations affect the water/fuel separation
process.
If the fuel tank is located below the engine injection
pump, an additional electric fuel feed pump should be
installed between the prefilter and the feed pump of the
engine.