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Chapter 4
The Vacufl ush® head uses a combination of vacuum
suction and water fl ow from the fresh water tank to
clear the head of waste. Before using the Vacufl ush
system turn the head circuit breaker to the “on” posi-
tion at the main DC control panel.
Make sure that there is always a small amount of wa-
ter left in the toilet head bowl. This acts as a trap and
will reduce unwanted odors.
Before leaving the boat for an extended period, fl ush
the head for at least 10 seconds. This ensures that
waste has cleared the sanitation transfer hose and has
entered the holding tank.
Waste left within the transfer hose tends to dry out
and harden. This could restrict the internal size of
the hose and hamper future operation. The system
components including the hose are formulated for
the transfer of sanitary waste only. Do not allow the
following items in the system: Strong acid or caustics
such as drain openers, petroleum solvents or fuels,
alcohol based products such as antifreeze and pine
oil products along with sanitary napkins and baby
diapers.
System vacuum is monitored by a switch located on
the outside of the vacuum generator’s tank. When
the switch senses a vacuum drop, it automatically
signals the pump to energize and bring the vacuum
back to the operating level. This is normally a two
minute process. In a properly operating system, the
stored vacuum will “leak” down between fl ushes,
causing the vacuum pump to run for a short period.
This is normal. The pump should not run for more
than once every (3) hours after the last fl ush.
To operate the Vacufl ush® head:
1. Activate the head breaker on the main DC panel.
2. Activate the fresh water system breaker on the
main DC panel since the fresh water tank is the main
water source for the Vacufl ush® system.
3. Lift the toilet lever until the desired water level is
reached. Generally the system requires more water
for solid liquid waste. See fi gure 1.
4. To fl ush the toilet, press the fl ush lever in one swift
motion down to the fl oor until contents in the bowl
disappear. A distinct popping noise is normal when
fl ushing action begins and the vacuum seal is broken.
Hold the lever down for at least 3 seconds. If fl ush
lever is accidentally released before waste clears the
bowl, do not try to fl ush toilet again until vacuum
pump stops running. A small amount of water should
remain in the bowl after fl ushing. See fi gure 2.
5. Do not dispose of sanitary napkins or other non-
dissolving items in the toilet. Do not attempt to fl ush
facial tissue, wet strength tissue, paper towels, or
excessive quantities of toilet paper down the toilet.
These types of items do not dissolve and cause plug-
ging of the system.
See fi gure 3.
6. Make sure all passengers are aware of the toilet
operation.
7. If using holding tank deodorant, use the approved
ones for the system.
8. See the maintenance section for cleaning and rou-
tine inspection items.
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