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Chapter 4
e macerator (overboard
discharge pump) option
is located in the engine
room. It is connected to a
normally closed seacock. In
locals where it is approved
the seacock is opened and
the macerator is activated through a key switch and
button located at the ship’s main salon control panel
(shown above). At that point waste travels from the waste
holding tank through the macerator pump where it is
ground up and then exits through the hull bottom at the
open seacock. See the photo.
To Use Macerator (If Installed):
Make sure it is legal to pump waste overboard
before starting the operation.
Locate the overboard discharge seacock in the
engine room. Usually this seacock can be identi ed by the
stack of tie wraps next to it. Also, look for the incoming
hose that runs from the output side of the macerator to
the seacock. It is normally a 1 1/2” diameter white hose.
Since the seacock by law must have another means
besides the handle to keep it closed. e tie wrap serves
that need. Cut the tie wrap to access the seacock handle.
Outboard vessels normally install the macerator in the a
storage compartment.
Typical Macerator (Overboard Discharge Pump)
KEY SWITCH
MACERATOR
ON BUTTON
MACERATOR
BREAKER
MACERATOR
SEACOCK IN
OPEN
POSITION
TIE WRAPS
HOSE FROM
MACERATOR
MACERATOR SEACOCK
Turn the seacock handle to the “open” position.
It should be positioned in line as shown in the photo.
Activate the macerator breaker at the 12 volt salon
main DC control panel.
At the level monitor panel shown above turn the
key to the “on” position. With the key switch being held
in the “on” position push in on the macerator button to
start the overboard discharge. Continue to discharge
the waste until the monitor panel shows empty for the
waste tank. At this point, shut o the macerator switch,
deactivate key switch and turn macerator breaker to the
“o ” postion.
Close the seacock handle. It should now be at a
90 degree angle to the seacock.
Use a tie wrap and refasten the seacock handle
tightly so it can not be moved.
At this point you may desire to add an approved
holding tank deodorant by ushing the recommended
amount down the toilet.
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