As mentioned earlier, a water pressure system is
fitted in Version B. The complete pressure
assembly, consisting of the electrical pump, a small
pressure tank and electronic devices, is fitted in
the engine compartment to port, near the forward
bulkhead (see Diagram 2 B and plate 30). The
main switch for the water pressure system is fitted
in the switchpanel (paragraph 3.5).
From the water pressure unit the piping leads
directly to the taps in the galley and toilet room.
The pump unit works automatically in that it starts
functioning as soon as the pressure in the system
drops below a preset value. Thus, as soon as a tap
is opened and water evacuates, the pressure drops
and the pump is activated.
This working principle for the water pressure
system means that any small leakage which might
occur, will easily and immediately be detected. The
leakage will cause a continuous pressure drop in the
system, which again will activate the electric pump.
The pump will start and stop regularly with a fre-
quency dependent on the quantity of water lost,
and the pump is, fortunately, not completely
noiseless.
On some of the fresh water pumps fitted, a small,
red starting button is provided on the pump casing.
As the automatic switch of the pump refuses to work
unless a minimum pressure exists in the system,
the starting button has to be depressed for starting
whenever the fresh water tank has been com-
pletely drained and the pressure in the system has
dropped to zero. As soon as pressure has been
built up in the system, the starting button can be
released, and the automatic switch takes over. This
arrangement is provided to avoid the pump to run
dry.
In Version A, manually operated fresh water
pumps are fitted in the galley and toilet room.
Sanitation:
Operating instructions for the head are given in
paragraph 3.10. As a supplement to these
instructions, a comprehensive installation and main-
tenance instructions leaflet is delivered together
with the head and is enclosed with this MANUAL.
We recommend that all hose clamps, hoses and
connections, as well as the pumps and the electrical
devices of the pressure unit in Version B, be
thoroughly inspected during the periodic servicing
to be carried out every 150 hours (or 3 months)
of engine running. Brittle hoses must be replaced,
and any leakage which might occur, must be
repaired.
Plate 31
Through-Hull Fitting, Cockpit Drainage
A) Gate Valve on Connecting Line between Fresh
Water Tanks
B) Hawse from Cockpit Scupper (Port) to
Through-Hull Fitting
C) Through-Hull Fitting with Gate Valve
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