IS 3.5 - 4.0 - 5.0 - 6.0
- 10 -
1
Fig. 6
Fig. 7
Fig. 8
Anti-siphon valve
Exhauste manifold
Water pump
Fig. 9
ANTI-SIPHON VALVE
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 - Ball tap (general) 1/2"
3 - Ball tap (drainage) 1/2"
This is used to drain the cooling system of the electric
generator for general maintenance or when a long
period of inactivity is expected.
4 - Water filter (can be inspected)
This must provide efficient protection for the cooling
circuit from the entrance of mud, sand and seaweed.
IMPORTANT
The filter mesh should be very fine. Mesh 2 - 470
micron is recommended, other sizes do not give
good filter performance.
5 - Anti-siphon valve: this valve returns the cooling circuit
to atmospheric pressure when the motor is switched
off, to prevent the siphon phenomenon.
It must be installed when the generator is fitted
with the drainage mixer on or beneath the water
line, and should be positioned at least 50 cm above
water level.(see fig. 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 during normal operation small quantities of water
might be leaked from the duct.
The box already includes 2 holes to connect the anti-siphon
valve (fig. 9).
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