050407.01
7
DWSC Drinking water tank systems 120 litres
ENGLISH
3 Installation
3.1 General
Take the following into account when choosing a position for the
tank and the deck filler cap:
• The filler hose must be as short as possible, must slope down con-
tinuously from the deck cap to the tank and must be as straight
as possible.
• The height difference between the tank and the filler cap may be
a maximum of 3 metres (10 ft) (the maximum excess pressure in
the tank is 0.3 bar ! (4.3 psi))
3.2 Position
• Position the tank in such a way that it is readily accessible for in-
spection.
• The space in which the tank is placed should be properly ventilat-
ed. The tank should be 1 cm (3/8") free all round from bulkheads
or other tanks, to provide ventilation.
• There must be sufficient free space available to perform mainte-
nance on the pump.
• Also ensure that there is sufficient free space over the top of the
tank for the hose connections. These must be easily accessible
during installation.
• Make sure that the foundation for the tank is strong enough to
locate it securely. The tank will increase in size slightly when filled.
Take this into account when securing the tank.
• Attach the tank using
the stainless steel rings
supplied.
3.3 Fitting in sailing boats
When fitting remember that the filler hose must always be posi-
tioned on the same side of the boat as the tank. This prevents too
high a pressure from possibly occurring in the tank when sailing at
an angle.
3.4 Inspection cover and fittings
The inspection cover and the fittings are pre-assembled in the upper
section of the tank.
• Undo the bolts so that the fittings can be placed the right way
round.
• Tighten the nuts using the
wrench, never with water-pump
pliers. Do not tighten the nuts
excessively.
• After 2 days check that the con-
nector nuts are still tight, tighten
more securely if required. Repeat
this after 4 days.
• The sensor for a water level meter is already fitted in the top of the
tank. The sensor can be connected only to a Vetus level indicator
for water.
3.5 Tank connections
See pages 28 and 29 for an installation example.
• Connect the tank with a good quality reinforced hose. Avoid
sharp bends and kinks or sagging in the hose.
The reinforced hose must be of quality suitable for drinking water
and resistant to a temperature of at least 60 degrees C (140 degrees
F) and a pressure of 4 bar (4 kgf/cm
2
, 58 psi).
Vetus supplies a hose suitable for tap water. It is tasteless, non-poi-
sonous, resistant to temperatures from -5 to +65 degrees C (+23 to
+149 degrees F).
Article Code:
DWHOSE12A, drinking water hose, 12 mm (
1
∕
2
”) internal diameter
DWHOSE16A, drinking water hose, 16 mm (
5
∕
8
”) internal diameter
DWHOSE38A, drinking water hose, 38 mm (1
1
∕
2
”) internal diameter
• Fit every hose connection with a good stainless steel hose clip.
• Fit filler cap (13).
• Install a filler hose (14), 38 mm (1
1
∕
2
”) internal diameter, between
the filler cap and the tank. Instal this hose in such a way that nei-
ther tank nor filler cap are subject to mechanical loads.
• Fit air-relief nipple (12) as high as possible above the level of the
top of the tank. Ensure that the air-relief nipple is fitted where it
cannot fill with rain or other water.
• Fit air-relief pipe (11), 16 mm (
5
∕
8
”) internal diameter, between air-
relief nipple and the tank (3).
• When viewed from the tank, the air-relief pipe should be fitted
straight up.
• Fit the tap water supply pipe (18), 12 mm (
1∕2
”) internal diameter,
between tank and pump.
3-10153-2
