CHAPTER 6
6-98
Overboard Discharge
HOLDING TANK
MACERATOR/
WASTE DISCHARGE
PUMP
VACUUM
PUMP
RELIEF
VALVE
VACUUM GENERATOR
TANK
A few notes regarding the vacuum generator tank:
A. The holding tank level can be easily monitored by a visual inspec-
tion. Before venturing out on a cruise it is a good idea to have the
holding tank pumped out. The tank manufacturer has installed a
shutdown relay into the holding tank to prevent overfi lling. When the
holding tank reaches the “full” level the relay shuts down the vacuum
generator and the toilet will not fl ush.
B. As a safety device there is a relief valve built into the vacuum sys-
tem. It will activate if the pumping station pump is running too high
a vacuum.
C. Since a small amount of water usually remains in the holding tank it
is a good idea to rinse the tank especially after cleaning. Add water to
the toilet bowl along with 8 ounces of manufacturer’s tank deodorant
and cleaner until the discharge is clear. Do not use chlorine based or
caustic cleaners along with drain openers as damage to the seals and
hoses may occur.
CHAPTER 6
6-98
Overboard Discharge
HOLDING TANK
MACERATOR/
WASTE DISCHARGE
PUMP
VACUUM
PUMP
RELIEF
VALVE
VACUUM GENERATOR
TANK
A few notes regarding the vacuum generator tank:
A. The holding tank level can be easily monitored by a visual inspec-
tion. Before venturing out on a cruise it is a good idea to have the
holding tank pumped out. The tank manufacturer has installed a
shutdown relay into the holding tank to prevent overfi lling. When the
holding tank reaches the “full” level the relay shuts down the vacuum
generator and the toilet will not fl ush.
B. As a safety device there is a relief valve built into the vacuum sys-
tem. It will activate if the pumping station pump is running too high
a vacuum.
C. Since a small amount of water usually remains in the holding tank it
is a good idea to rinse the tank especially after cleaning. Add water to
the toilet bowl along with 8 ounces of manufacturer’s tank deodorant
and cleaner until the discharge is clear. Do not use chlorine based or
caustic cleaners along with drain openers as damage to the seals and
hoses may occur.
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