Mastervolt Whisper 6 Installation Manual page 8

INSTALLATION
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 coolant 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
users manual.
3 INSTALLATION OF THROUGH HULL FITTING
It is good practice for yachts to use a hull inlet fitting
with an integrated strainer (water scoop). For propul-
sion engines in motorboats the water scoop is often
mounted against the sailing direction to induce more
water intake for cooling.
This should not be done in the case of a
generating set! When ailing at higher
speeds, water will be forced into the inlet
and your generating set will overflow!
sailing direction
WRONG!
Fig. 5.
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.
4 WATER STRAINER
Use an appropriate water strainer with connections of
19 mm (3/4"). Install the water strainer in a well ac-
cessible position, (ref. to fig. 4 - 6) 15 cm above the
waterline.
8
thru-vessel inlet
flow direction
5 SIPHON BREAKER (AIR VENT)
When the point of water injection is below the water-
line, 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 ge-
nerating set is designed to accommodate a siphon
breaker (air vent). In the standard delivery the con-
nections are bypassed. Hose of 19 mm (3/4") 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; air must flow in freely as
well.
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
INTO THE ENGINE
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.
Fig. 6.
October 2004 / WHISPER 6/8/12 & 6 ULTRA / EN
IS NEVER COVERED BY