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1
Introduction
The pressure tank with the rubber membrane in the pressurized
water system ensures that a small quantity of water is immediately
available under pressure for the water system.
As a result, the pump motor is not switched on each time water is
tapped and a regular flow of water is available in your boat.
The rubber used for the membrane will not give off any dangerous
materials in the 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 sufficient
cross sectional area.
- Ensure that the pressurized water system is properly prepared for
winter before the temperature falls below zero. Otherwise, irrepa-
rable damage may be caused to the system.
- Carry out the maintenance described regularly.
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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, page 19), drain plug (principal dimen-
sions, 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 posi-
tions; however the drain plug must never be in the highest posi-
tion.
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 out-
let 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 can accommodate
a pressure of at least 8 Bar (116 psi), and an internal diameter 19
mm (3/4").
• Secure the hose with stainless steel hose clamps.
If the system is installed using stainless steel or copper piping, the
pressurized water system must still be connected using short sec-
tions of hose.
6
050408.01
Electrical Installation
The minimum cross-section for the connecting cables is 2.5 mm
(AWG 14). Voltage loss between battery and pressurized water sys-
tem 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) greater than 10 m (model
PFWS1219), use a cable with a cross-section of 4 mm
A main switch and fuse* must be incorporated in the positive cable.
• Check that the voltage stated on the identification plate is the
same as the battery voltage.
• Connect the system as shown in chapter 7, page 17.
• Install a relay to operate the 12 Volt Water Pressure System
PFWS1219.
*) Fuse :
Model PWFS1219
Model PWFS2419
3
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 'Main-
tenance' .
4
Winter Preparation
The whole water system, including the pressurized water system,
should always be drained. Never fill the water system with anti-
freeze, it is very poisonous!
Draining the pressurized water system
• Loosen the hose on the pressure side of the pump (drawing 4)
and take the drain tap from the connector piece (drawing 5).
• Allow the pipes and pressure tank to drain empty. Then let the
pump run for a time without any water input.
2
(AWG 12).
25 A for 12 Volt system
15 A for 24 Volt system
Pressurized-water system PFWS
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