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Water and waste:
Clean water:
collected in a pressurized potable tank,
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Manual shutoff valves located under the washbasins or toilet bowls regulate the flow .
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The system can be filled or drained from the service panel under the fuselage. The indication of
the water quantity in the water tank is displayed on the FAP and the aft service panel.
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Tank pressurization:
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on ground, the water system is pressurized by the air from the service panel pressure
port (or the air-supply boost system).
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In flight, the water system is pressurized by the bleed air.
Tank location:
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A321: 200L ( or 135L ) In the AFT cargo compartment wall on the left side.
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A320: 200L In front of the wing box, behind the FWD cargo compartment.
Waste water:
The waste water (from galleys and lavatories) drains overboard through two electrically heated drain masts.
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The forward mast drains the waste water from the forward cabin.
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The aft mast drains the waste water from the aft cabin.
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The waste and water are discharged by:
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Gravity, on ground
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Differential pressure, in flight.
Toilet waste:
When the toilet is flushed differential pressure forces the waste from the toilet bowls into the waste tank that
has a capacity of 170L and a water/ rense valve open with the flush valve to clean. The flush control unit controls
the flush sequence in each toilet.
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The Vacuum System Controller (VSC) ensures system control:
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On ground, and in flight below 16 000 ft: the differential pressure is generated by the
vacuum generator.
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Above 16,000 ft the outside differential pressure is used
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-Flight attendant panel to indicate the waste tank levels and report system defects
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Centralized Fault Display System (CFDS) to signal the system defects to the
maintenance.
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A manual shutoff valve isolates an inoperative toilet.
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In the case of an electrical failure of the flush valve, the manual flush control can be used.
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The manual flush control is located under each toilet bowl.