Vetus NLP Série Instructions D'installation page 5

Hose connections
In order to achieve the ideal connection between the hoses and
the waterlock, both hose connections turn through 360
degrees.
NLP40/45/50
NLP50S/60/75/90
Loosen the bolts before turning the hose connections!
Tighten the hose connections to a torque of 1 Nm.
The top portion of the waterlock can be turned in a 360˚ radius.
The top portion should be turned as follows:
1 Unscrew the clamping strip
2 Turn the top portion to the desired position
3 Tighten the clamping strip sufficiently, to a torque of 0,3 Nm.
Fitting the hose
To ease the fitting of the hose to the hose connector, use only
water and/or soap, NOT grease or products containing oil.
Fit each hose connection with 2 stainless steel 12 mm (0.5")
wide hose clamps.
Sensor for temperature alarm
A sensor for a temperature alarm can be fitted in the exhaust
pipe.
Waterlock NLP
Installation Examples
Exhaust systems with a waterlock type NLP , silencer type MP ,
goose neck type LT and a transom connection are shown on
page 15.
Entry of water from the aft is almost completely prevented by
the extra height difference in the goose neck.
When the engine is stopped, any water which is still in the
exhaust pipe (between the highest point in the exhaust system
and the exhaust silencer) will run back to the exhaust silencer.
To reduce the amount of this water as much as possible, the
goose neck should be fitted directly above the exhaust silencer,
if possible (see drawings 1 and 3).
When the goose neck is fitted directly to the transom (drawings
2 and 4), the maximum length of the exhaust pipe, between
exhaust silencer and the highest point, should be taken into
account.
Prevention of syphoning (drawings 3 & 4)
If the water injection point 'C' is below, or less than 15 cm (0.6")
above the waterline (also when the ship heels under sail), there
is a risk that when the engine is stopped, the coolant water will
enter the engine due to syphoning. This syphoning can be pre-
vented in two ways:
By creating an air vent system in the coolant water hose
between engine block and water injection point 'C', by fitting
an air vent with air vent pipe, for example.
By fitting an air vent (with valve) in the coolant water hose
between the engine block and water injection point 'C'.
Maintenance
Check all hose connections for gas and water leaks regularly.
Before the winter lay-up, drain the waterlock. The waterlock has
two drain plugs for this purpose.
ENGLISH
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