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Normally, source air to pressurize the water systems is regulated bleed air from the
environmental control system. In the event that supplied bleed air is not available, a
back-up compressor is used to provide pressurized air to the system.
Water tank level indicators for both systems are located on the galley control panel. Water
levels of empty, 1/4, 1/2, 3/4 and full are indicated. Level sensors are installed at each level
in both tanks. When the water level falls below the empty sensor, the empty indicator
changes from green to amber and all other level indicators are off.
Portable Wash/Water System --- Controls
Figure 21---20---1
Potable Wash/Water System
Controller Panel
Electrical power to the forward and aft systems is controlled by ON/OFF switchlights on the
galley control panel. This provides power to operate the electrical heaters, compressor and
level indication system. Wash basin water is heated to 25 ±5_C (68 -- 86_F) by a water
heater in each lavatory cabinet.
The systems provide drainage of used water overboard through drain masts on the bottom
of the fuselage. All components likely to freeze are heated and/or insulated to maintain
temperatures above freezing. An electronic controller monitors temperatures by zone and
controls heater temperatures to prevent ice formation. The drain masts are connected
directly to the AC service bus. Each drain mast contains a thermal fuse for overheat
protection which removes power when the temperature exceeds a preset point. Power can
be removed from the drain masts by opening the circuit breakers on the potable water
system control panel or by removing power from the AC service bus. The controller uses
weight-on-wheels information to determine the power application to the drain masts. When
the airplane is on the ground, power to the drain masts is reduced.
Vol. 1 21--20--2
WATER AND WASTE SYSTEMS
Potable Water System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Potable Water System --- Block Schematic
Figure 21---20---2
CB2--D8
FORWARD DRAIN
MAST
AC POWER
WOW DATA
PWS CONTROLLER / PANEL
CREW INTERFACE
115 VAC, 400 Hz,
3--PHASE POWER
FROM SERVICE BUS AFT DRAIN MAST
MDC
FORWARD DRAIN
MAST CONTROL
AFT DRAIN
MAST CONTROL
SWITCHING
FORWARD
POTABLE
WATER FILL
AND DRAIN
SERVICE
PANEL ECS
BLEED AIR
SUPPLY
HEATING
BACK--UP
COMPRESSOR
AFT POTABLE
WATER FILL
AND DRAIN
POTABLE WATER SYSTEM
DRAIN
FORWARD
GALLEY
POTABLE
WATER
SUPPLY
HEATED
DRAIN
MAST
HEATED
DRAIN
MAST
FORWARD
DRAIN
DISCHARGE
AFT
DRAIN
DISCHARGE
DRAIN
HEATED
POTABLE
WATER
SUPPLY
DRAIN
AFT
GALLEY
POTABLE
WATER
SUPPLY
DRAIN
AFT
LAVATORY
HEATED
POTABLE
WATER
SUPPLY
FORWARD
LAVATORY
WATER
SYSTEM
SERVICE
PANEL
Vol. 1 21--20--3
WATER AND WASTE SYSTEMS
Potable Water System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
The diagnostic light, on the galley control panel, will come on when the potable wash/water
system controller panel detects a fault in the system. It will remain on until the fault is
corrected. Drain mast faults are indicated by separate lights to identify the failed mast.
Each potable water system has a service panel located on the exterior fuselage. The
forward service panel is located on the right forward lower side of the fuselage. The aft
service panel is located on the left side under a panel in the wing root fairing. Each service
panel has a fill adaptor and a control handle.
When the control handle is placed in the FILL position, water can be pumped into the
system using the fill adapter. When the tank is full, water flows out through the overboard
drain mast. The control handle must be returned to the FLIGHT position after filling is
complete or the service panel door will not close. System inlet fill pressure is limited to 50
psig.
When the control handle is placed in the DRAIN position, the potable water is drained from
the tanks through the drain mast.
Portable Water System Service Panel
Figure 21---20---3
Potable Water Service Panel
Exterior Lower Fuselage
Vol. 1 21--20--4
WATER AND WASTE SYSTEMS
Potable Water System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
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