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LAVATORY
HEATED DRAIN
MAST (AFT)
P
ECU
PRESSURE
RELIEF
VENT
MANIFOLD
WATER FILL PORT
FILL AND DRAIN
HANDLE
Potable Water Service and Drain Panel
FAUCET
SWITCH
FILL
VALVE
DRAIN
MANIFOLD
Electrical connection.
Mechanical connection.
Fill line.
Overflow line.
Drain line.
Pressure supply line.
LEGEND
DUSTCAP
SHUTOFF
VALVE
LAVATORY
WATER
TANK
ASSEMBLY
Vol. 1 21--20--5
REV 56, Jan 31/03
WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual
CSP A--013
MASTER
Galley Control Panel
Figure 21--20--3
WATER LEVEL Indicators (green)
Come on to indicate water level in
corresponding tanks. Tank heaters
will not come on if E (empty)
indicator is off. Will flash to indicate
control failure.
EMPTY Indicators (green)
Go off to indicate corresponding
tanks empty. Tank heaters and
pumps, automatically deactivated.
Will flash during warm--up sequence.
OVERHEAT Indicators (amber)
Steady -- Comes on to indicate an overheat.
The heaters are automatically de--activated.
Flashing -- Comes on to indicate a heater
control malfunction. The heaters are
automatically de--activated.
GALLEY POWER Switch (green)
ON:
Activates heater system,
Turns on level control system
OFF:
De--activates heater system,
Turns off level sensing.
15 minute total warm--up sequence.
NOTE
Water System Circuit Breakers
Used to protect the following:
Galley and lavatory pumps control
system.
Galley and lavatory tank heaters.
Galley and lavatory heating system.
LAVATORY POWER Switch (green)
ON:
Activates heater system,
Turns on level control system
OFF:
De--activates heater system,
Turns off level sensing.
REV 56, Jan 31/03
Vol. 1 21--20--6
WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Potable Waste
System
WASTE
SYSTEM DC SERVICE
U4
Water System
Control Logic WATER CONT
BUS
2
U5
Lavatory Tank
Heaters
WATER HTRS
LINES AC UTIL BUS
D13--D14
Lavatory Line
Heaters
WATER HTRS
TANKS
2
D15
Potable Water
GALLEY
CONT & IND DC SERVICE
Ci i
System Galley GALLEY TANK
HTR AC UTIL BUS
Circuit
Breakers
are
GALLEY LINE
HTRS
2
located on
Galley
LAVATORY
CONT & IND DC SERVICE
the Control
Panel
Lavatory
LAVATORY
TANK HTR AC UTIL BUS
LAVATORY
LINE HTRS
2
Vol. 1 21--30--1
REV 56, Jan 31/03
WATER AND WASTE SYSTEMS
Lavatory Waste System
Flight Crew Operating Manual
CSP A--013
MASTER
1. LAVATORY WASTE SYSTEM
The lavatory waste system stores waste material from the lavatory toilet and provides a
means of flushing the toilet bowl. The toilet assembly is self-contained and consists of a
integral seat and bowl assembly, holding tank, electric pump, timer, filter, flush handle and
service panel.
The holding tank holds the deodorant flushing solution and waste material until removed by
ground servicing personnel.
When the toilet flush handle is pushed, a timer energizes the electric pump for 10 seconds.
The pump draws the flushing fluid from the tank, through a filter, and sends it out through the
bowl assembly flush ring.
The system is serviced by means of a lavatory service panel, located on the right side of the
aft fuselage. When the service vehicle drain line is connected to the drain port, the T-handle
is pulled then rotated to the left. This opens the holding tank drain valve, on the bottom of
the tank, allowing the tank to empty through the drain line.
Once the holding tank is emptied, rinsing agent and flushing fluid are sent through the
charging port, flushing and cleaning the tank and lines. The T-handle is then turned to the
right and pushed in to close the drain valve. The tank is then filled with precharge flushing
fluid until the fluid level light on the service panel illuminates.
The toilet requires a precharge of 2.3 US gallons (8.7 liters) of flushing fluid.
REV 56, Jan 31/03
Vol. 1 21--30--2
WATER AND WASTE SYSTEMS
Lavatory Waste System
Flight Crew Operating Manual MASTER
CSP A--013
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Bombardier_CRJ_00-Water_and_Waste(3)
