The muffler (fig.4, ref.6) collects
the water in the exhaust hoses when the generator
motor is turned off, thus preventing it from flowing
into the motor through the exhaust manifold and
valve. For this reason it is essential the position of
the muffler and the length of the hoses indicated on
the installation chart be carefully followed.
4.3
Typical installation with electric generator
below the water line (fig. 5)
1
Raw water intake
2
Intake valve
3
Drain valve
4
Water filter
5
Anti-siphon valve
6
Barrel muffler
7
Silencer
8
Exhaust through-hull
9
Generating set
10
Anti-siphon drain hose
11
Water line
A
- Hose - internal diameter 50 mm (1.96")
B
- Hose - internal diameter 15 mm (.59")
C
- Clamps
4.4
Typical installation of electric generator with
"E/G" separator above (fig. 6) and below
(fig. 7) the water-line
References for figure 6:
1
Raw water intake
2
Intake valve
3
Drain valve
4
Water filter
5
Electric generator
6
Barrel muffler
7
"E/G" Separator
8
Exhaust through-hull
9
Silencer
10
Gas exhaust
11
Water line
References for figure 7:
1
Raw water intake
2
Intake valve
3
Drain valve
4
Water filter
5
Anti-siphon valve
6
Barrel muffler
7
"E/G" Separator
8
Exhaust through-hull
9
Silencer
10
Gas exhaust
11
Water line
12
Drainage
13
Anti-siphon valve
A
- Hose -inside diameter 50 mm (1.96") , suitable for
raw water/exhaust gas.
B
- Hose - inside diameter 15 mm (.59"), suitable for raw
water.
C
- Clamps.
D
- Hose - inside diameter 40 mm (1.57"), suitable for
exhaust gas (Max 70 °C (158 °F)).
E
- Hose - inside diameter 25 mm (1"), suitable for raw
water.
The measurements should
correspond exactly.
In order to have a better noise
damping it is recommended to adopt a silencer, on
the "D" tube, at the distance of 40" from the
"E/G" separator.
4.5
Components
The raw water intake system must
be separate from the one for the engines propelling
the boat.
1
- Direct water intake 1/2"
If the unit is installed more than 1
metre above the water-line, a check valve should be
fitted after the sea intake (fig. 8, 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 valve (general) 1/2"
3
- Ball valve (drainage) 1/2"
This is used to drain the cooling system of the
generator for general maintenance or when a long
period of inactivity is expected.
4 -
Water filter (can be inspected)
This must provide sufficient protection for the cooling
circuit from the entrance of mud, sand and sea-
weed.
Rate of flow for IS7.6 is 6.6 gal/min.
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 is a valve that brings the
cooling circuit back to atmospheric pressure when
the motor is turned off, thus avoiding the formation
of siphons.
It is mandatory to use the Anti-siphon
valve when the base of the generator is below
the water line
, and it must be positioned at least
12". above sea level.
(see fig. 11).
11
