INSTALLATION
8 Copyright © 2009 Mastervolt / October 2009 / WHISPER 3.5 / EN
On motorboats and on sailing boats the water scoop for a
generating set should be fitted with the opening faced
backwards to prevent water being forced in during sailing.
Use a sealant when mounting the skin fitting.
3 WATER STRAINER
Use an appropriate water strainer with connections of 12.5
mm (1/2"). Install the water strainer in a well accessible
position, (refer to figure. 5, ref 6) 5 cm above the waterline.
4 SIPHON BREAKER (AIR VENT)
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 happening, the generating set is
designed to accommodate a siphon breaker (air vent). In
the standard delivery the connections are bypassed. Hose
of 12.5 mm (1/2") inner diameter should be used.
If the generating set cannot be mounted such that the
bottom of the generating set is placed above the waterline,
an air vent must be installed. Extend the water hose of the
by-pass 600 mm above waterline and install an air vent.
Ideally, the air vent should be mounted above the yacht
keel center line (i.e. to minimize the influence of swaying
on the water intake). The hose of the drain should go
downwards. Water must flow out freely and air has to flow
in freely as well (refer to figure 7).
Fast motorboats will lay deeper when sailing at large
speed and can cause pressure on the waterinlet. This
should be avoided to prevent fleeding the engine.
If the air vent is clogged the water hoses will
not be vented when the generating set has
stopped and water can be forced into the
engine. This leads to immediate engine
problems and eventually severe damage!
DAMAGE CAUSED BY THE INGRESS OF WATER IN
THE ENGINE IS NOT COVERED BY WARRANTEE
On the valve is a little hose to drain a little water that could
be spilled from the valve. This hose should go down and
may not end under water, because it should ventilate air
into the valve to break the siphoning (figure 7).
OPEN
Figure 7: Wrong siphon breaker hose routing
Check the air vent at regular intervals. Open, clean and
lubricate the valve as required (figure 8).
Figure 8
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