Regal 53 SC Owner's Manual page 319

SEA CHEST SELF-CLEANING
STRAINER SYSTEM
Theory-
Normally seacocks with in-line raw water stainers feed
raw water to multiple components including the engines,
generator, air conditioners, and toilets. With that in mind
these systems occasionally need to be shut down to clean
the strainer baskets of debris.
The sea chest system employs a central macerator
mechanism that grinds accumulated incoming line debris
that would normally end up inside the strainer basket.
This system eliminates the need for strainers and strainer
cleaning on selected components.
An additional feature is connected to the generator system.
A solenoid valve is found in line with the generator water
intake for cooling the generator. This solenoid valve is
normally closed. When the generator is cranked the valve
assumes an open position and permits fi ltered sea-water
to enter the generator water circulation system. See the sea
chest diagram for more information.
Operation-
With this option a large seacock with a grated scoop is
attached to the outside hull. It forces raw water into the
macerator and exits as fi ltered sea-water which is routed
to selected auxiliary components mentioned above.
Electrically speaking there is a 30 amp breaker at the ship's
main DC panel labeled SEA CHEST providing system
over current protection.
A 5 amp fuse protects the incoming circuit wiring and is
located at the battery management panel. A 3 amp fuse
is located on the bilge mounted operator's panel acts as
a memory for the cleaning circuitry so it need not be
reprogrammed when the main DC breaker is turned off.
The house battery switch can be in either the ON or OFF
position, as the Sea Chest memory breaker is a constantly
energized circuit. See the operator's panel photo for more
information.
Note that the engine strainer baskets still require periodic
cleaning. and are not part of the sea chest system.
INCOMING RAW
SEACOCK WATER
BAND CLAMP
FILTER
BASKET
INSIDE
SEA CHEST OVERVIEW
58
Chapter 7
COTTER
PIN
COVER
OUTGOING FILTERED
WATER TO COMPONENT
MACERATOR
PUMP