- 15 -
IS 2.5 GENERATORS
GB
2.4. Components
1- Direct sea intake 1/2"
IMPORTANT
If the unit is installed more than 1 metre above
the water-line, a check valve should be fitted after
the sea intake (fig. 6, ref. 1) to prevent the water
circuit emptying when the motor is off. If this
empties, the rotor of the water pump might be
damaged during start up; for the same reason,
when the unit is first started up, the suction tube
from the valve to the pump should be filled
manually.
2- Balltap(general)1/2"
3- Balltap(drainage)1/2"
Thisisusedtodrainthecoolingsystemoftheelectric
generator for general maintenance or when a long
period of inactivity is expected.
4- Waterfilter (canbe inspected)
Thismustprovideefficientprotectionfor thecooling
circuitfromtheentranceofmud,sandandseaweed.
IMPORTANT
The filter mesh should be very fine. Mesh 2 - 470
micron is recommended, other sizes do not give
good filter performance.
5- Anti-siphonvalve:thisvalvereturnsthecoolingcircuit
toatmosphericpressurewhenthemotorisswitched
off,topreventthesiphonphenomenon.
It must be installed when the generator is fitted
with the drainage mixer on or beneath the water
line, andshould bepositioned atleast50 cmabove
waterlevel.(seefig.8/9)
IMPORTANT
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. 7)
N.B.: The drainage duct should be taken into the bilge because
duringnormaloperationsmallquantitiesofwatermightbeleaked
fromtheduct.
Theboxalreadyincludes2holestoconnecttheanti-siphonvalve
(fig. 9).
2.5. Drainagesystem
Thefluegas/waterdrainagesystemofthegeneratormust
be separate from that of the main motors
IMPORTANT
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- Tankmuffler(capacity3.5litres)
Thisdampensthenoiseofthedrainageandstopsthe
water flowing back towards the motor. The muffler
shouldbeinstallednolessthan1metreawayfromthe
generatorandpositionedataheightlessthanorequal
to that of the base plate of the generator.
2- Silencer
This further reduces noise. It should be installed no
morethan 1metre fromthe seadrainage nozzle.
3- Sea drainagenozzle; Itshould beinstalled so thatit
isalways abovethe waterline.
3.0. FUELCIRCUIT
The unit is fed by diesel fuel through the tubes marked
“DIESEL”and“DIESELRETURN”(fig.10,ref.1-2).This
latter is used for the return of the excess fuel. It is
necessarytoinstalla filterinconnectionstothefuel
tank,itisalsoadvisabletofitatapontothepowersupply
line downstream of the tank and a single-acting valve
(check valve only for a difference in height of 50 cm or
more)topreventthefuelsystememptyingforanyreason.
Useavalvewitha50millibaropening.
Thefuelpipesshouldbeinhydrocarbon-resistantrubber,
ofinner diameter6 mm.
IMPORTANT
The unit is fitted with automatic diesel oil
drainage. If manual drainge is necessary, press
the "ON" button and 30 second before set going
the unit.
IMPORTANT
The fuel filter must be a "cartridge-type" with a
filtering grade of 5 to 10 micron
