Owner`s manual
3100 OFFSHORE
57
Chapter 6:
RAW WATER SYSTEM
6.1 General
In the raw or sea water systems, all water pumps are supplied by hoses connected to ball valves and thru-hull
fittings located in the bilge compartment. Always make sure the ball valves are open before attempting to
operate any component of the raw water system. 12-volt DC pumps supply sea water to most of the various
accessories.
The optional air conditioner uses an AC sea water supply pump. This is the only AC pump in the system and
it is automatically activated when the air-conditioning or heating system is in use.
Priming the Systems
Make sure the ball valves are open. Open the hose connector for the raw water washdown and activate the
pressure pump by turning the washdown pump switch to the “ON” position. Run the pump until all of the
air is purged from the system and then turn the switch “OFF.” Turn the livewell switch to the “ON” position.
Run the pump until all of the air is purged from the system and then turn the switch to the “OFF” position.
Closing the thru-hull ball valves before the boat is hauled from the water will help to eliminate air locks in
raw water systems.
It may be necessary to reprime the raw water system if the system is not used for an extended period and at
the time of launching.
6.2 High Pressure Washdown
A saltwater high pressure pump, controlled by a pressure sensor, supplies the raw water hose connector located
in the cockpit. The pump is activated by the washdown switch located in the aft cockpit panel. This switch
should be turned to the “ON” position just before using the washdown and be turned to the “OFF” position
when the washdown is not in use.
When activated, the pressure switch will automatically control the pump. As the pressure builds in the
washdown hose, the pump will shut off. When the washdown hose is in use and the pressure drops, the pump
will turn on.
The raw water washdown system is equipped with a sea strainer on the intake side of the pump located in
the bilge behind the stern access hatch. This should be checked frequently and cleaned as necessary.