4
050404.03
Pressurized-water system HYDRF12, HYDRF24, HYDRF1219, HYDRF2419
Introduction
The pressure tank with the rubber membrane in the pressurized
water system ensures that a small quantity of water is immedi-
ately available under pressure for the drinking water system.
As a result, the pump motor is not switched on each time water
is tapped and a
regular
flow of drinking water is available in
your boat.
The rubber used for the membrane will not give off any danger-
ous materials in the drinking water.
Following the recommendations below will result in a longer life
and better performance of your pressurized water system.
- Ensure that the water supply tank is always full; although the
pump can still run when dry, this will prevent unnecessary
dry running without the pressure tank being filled.
- Check that the battery voltage is correct.
- Battery voltage loss can be reduced by using cables of suf-
ficient cross sectional area.
- Ensure that the pressurized water system is properly pre-
pared for winter before the temperature falls below zero.
Otherwise, irreparable damage may be caused to the system.
- Carry out the maintenance described regularly.
Installation
Setting up the pressurized water system
The space where the pressurized water system is installed must
be dry and well ventilated.
When selecting a place for the installation, make sure that there
is enough room for carrying out maintenance work. The water
filter (principal dimensions, 1), drain plug (principal dimensions,
8), and the measuring/filler valve (Schräder valve) (principal
dimensions, 7) of the air cushion must be easily accessible.
To prevent noise and vibration, the pressurized water system
should not be fitted directly to a bulkhead or tank wall.
The pressurized water system can be mounted in a variety of
positions; however the drain plug must never be in the highest
position.
Installing the system
Fit the filter to the inlet side of the pressurized water system
(drawing 1), and the right-angle hose connector piece to the
outlet side (drawing 2).
Connect up the pressurized water system as shown in the draw-
ing (drawing 3).
For the piping, use a good quality hose which is suitable for
drinking water and which can accommodate a pressure of at
least 8 Bar (116 psi).
Model
HYDRF12
HYDRF24
: internal diameter of 12.7 mm (1/2”)
Model
HYDRF1219
HYDRF2419 : internal diameter of 19 mm (3/4”)
Secure the hose with stainless steel hose clamps. If the system
is installed using stainless steel or copper piping, the pressu-
rized water system must still be connected using short sections
of hose.
Electrical Installation
Check that the voltage stated on the identification plate is the
same as the battery voltage.
The minimum cross-section for the connecting cables is
2.5 mm
2
(AWG 14).
Voltage loss between battery and pressurized water system
must not be more than 10% of the supply voltage.
In a 12 Volt pressurized water system with a total cable length
(positive and negative cable together) of more than 24 m
(model HYDRFxx), 16 m (model HYDRFxx19), use cable with a
cross-section of 4 mm
2
.
A main switch and fuse* must be incorporated in the positive
cable.
*) Fuse : Model HYDRFxx
10 A for 12 Volt system
4 A for 24 Volt system
Model HYDRFxx19 10 A for 12 Volt system
7 A for 24 Volt system
Connect ‘+’ and ‘-’ as shown in the drawing.
Starting the pressurized water system
When starting the pressurized water system, ensure that there
is sufficient water in the tank and check that the drain plug is
fitted.
Open all taps; both hot and cold water. Switch the pump main
switch on, close the taps as soon as the water is free of air.
Check connections for leaks.
Check the pressure at which the pump is switched on and off. If
necessary, reset the pressure switch; see ‘Maintenance’.
For efficient operation the pre-pressure of the air cushion in the
tank must be about 0.2 Bar (3 psi) less than the pump switch
pressure. Check this pressure and adjust if necessary; see
‘Maintenance’.
