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2�8�3 Keelcooling
Keel cooling involves circulating the hot coolant through a space
in the keel, through a double walled skin of the boat, through
a box cooler, using a big tank or any other external cooler. Keel
cooling systems are extensively described in a separate manual
(art. no. 40200251). For these particular genverters, only a single
external cooler is needed.
2�8�4 Intercooling
When applying intercooling the genverter should have its own
raw water inlet and should not be connected to any other engine
systems. A properly installed cooling system is critical to keep
engine temperatures within an acceptable range. Ensure that the
installation complies with the following installation instructions.
2�8�4�1 Rawwatersupply
For raw water supply the following installation materials are
required:
•
skin fitting
•
sea cock
•
water strainer
•
hoses and clamps
In order to keep the suction resistance in the line at a minimum,
the sea water intake system (i.e. sea cock, trough-hull fitting, inlet
filter, etc.) must have an inner diameter matching the genvert-
er's, i.e. at least 19 mm (3/4") or 25 mm (1"), as applicable. The
suction hose should be kept as short as possible. Bends should be
avoided. Restriction of raw water flow, caused by kinked hoses,
undersized pipes or connections will reduce the engine cooling
capability. This is the main cause for overheating of an engine.
After running the generating set for the first time, check the cool-
ant flow rate using a stopwatch and by holding a pail of a known
volume under the wet-exhaust outlet. The flow rate should be
according to the data in the User's Manual.
2�8�4�2 Through-hullfitting
It is good practice for yachts to use a hull inlet fitting with an
integrated strainer (water scoop). For propulsion engines in
motorboats the water scoop is often mounted against the sailing
direction to induce more water intake for cooling.
Thisshouldnotbedoneinthecaseofagenerat-
ingset!Whensailingathigherspeeds,waterwill
beforcedintotheinletandyourgeneratingset
willoverflow!(seeFigure9).
OK!
WRONG!
Fig.7: Installing the water intake
On motorboats and on sailing boats the water scoop for a gen-
erating set should be fitted with the opening faced backwards to
prevent water being forced in during sailing.
2�8�4�3 Waterstrainer
Use an appropriate water strainer with connections of well
accessible position, 5 cm above the waterline (see water inlet kit
page 15 item 6).
2�8�4�4 Siphonbreaker(airvent)
When the point of water injection is below the waterline, then
– when the engine is stopped – there is a risk that the cooling
water may enter the engine as a result of siphoning. To avoid this,
the generating set is designed to accommodate a siphon breaker
1
2
(air vent). In the standard delivery the connections are sealed.
A
B
C
D
Fig.8: Syphon breaker connections
Page8
E
If the generating set cannot be mounted such that the bottom of
the set is above the waterline, an air vent must be installed.
Extend the water hose of the by-pass 60 cm above waterline and
F
install an air vent. Ideally, the air vent should be mounted above
the yacht keel centre line (i.e. to minimize the influence of sway-
1
2
ing on the water intake). Hose with an inner diameter of 19 mm
(1/2") or 25 mm (3/4"), as applicable, should be used.
3
4
5
UNLESS OTHERWISE SPECIFIED:
CHAMFER SHARP EDGES
GENERAL TOLERANCE
NEN ISO 2768-m
FORM AND PLACE TOLERANCES
NEN-ISO 1101
WELDING SYMBOL NEN EN 22553
ROUGHNESS ACC. to NEN3634
DRAWN
H.J.V.
CHK'D
PRINTED
3
4
6
Page9 / 10
TOLERANCE PRINCIPE
ISO 8015
PROJECTION : THIRD ANGLE
UNITS : mm
NAME
SIGNATURE
DATE
STATUS:
5-1-2024
DRAWING
7046A
6-2-2024
Weight: 1
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