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tank heater to maintain the water temperature between 10 to 20_C (50 -- 68_F). Each tank
heater contains a thermal fuse for overheat protection which removes power to the heater
when it exceeds a preset point and turns on the OVHT light on the galley control panel.
<0080>
Potable water is supplied to the lavatory sink from a single 5 USG (19 LTR) water tank
located in the baggage compartment. Potable water is supplied to the lavatory by a pump
which is controlled by the sink faucet selection. Wash basin water is heated to 25 ±5_C
(77 9_F).
A water level/temperature probe is installed in each tank and supplies level and temperature
information to the ECU. The ECU then uses the information to control the tank heaters and
to illuminate the respective empty, 1/4, 1/2, 3/4 or full level indicator on the galley control
panel.
Electrical power for the ECU, tank heaters and line heaters is controlled by the respective
galley and lavatory ON/OFF switches on the galley control panel.
Effectivity:
S Airplanes Pre SB 601R--38--19 thru 22
Each system provides drainage of used water overboard through drain masts on the bottom of
the fuselage. All components that could possibly freeze are heated and/or insulated to
maintain the component temperature above the freezing point.
REV 56, Jan 31/03
Vol. 1 21--20--2
WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual MASTER
CSP A--013
CAUTION
In flight, if the galley or lavatory ON/OFF switch is
inadvertently selected OFF, power will be removed
from the corresponding mast heater. Continued use
of the respective drain system may cause ice
accumulation on the drainmastwhichmay detach and
cause damage to the aircraft. <Pre SB 601R--38--19 thru 22>
Effectivity:
S Airplanes Post SB 601R--38--19 thru 22
Each system provides drainage of used water overboard through drain masts on the bottom of
the fuselage. All components that are likely to freeze are heated and/or insulated to maintain
the component temperature abovethe freezing point. The drain mast heaters are continuously
powered from AC utility bus 2. This is done to prevent ice build--up on the drain masts, in
flight, if the galley or lavatory ON/OFF switch is inadvertently selected OFF. Power can be
removed from the drain masts by opening the LINE HTR circuit breakers on the potable water
system control panel or by removing power from AC utility bus 2.
2. SERVICING
Each potable water system has a service panel located on the right side of the external
fuselage. The galley service panel is forward and the lavatory service panel aft. Each
service panel has a water fill port and a control handle.
When the control handle is positioned to 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. When the control handle is placed in the DRAIN position and pulled, the potable
water is drained from the tank through the drain mast.
Effectivity:
S Airplanes Post SB 601R--38--19 thru 22
When the control handle is positioned to 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. When the control handle is placed in the DRAIN position and pulled, the potable water is
drained from the tank through the drain mast. The control handle must be returned to the
vertical (closed) position or the serving door will not close.
Vol. 1 21--20--3
REV 56, Jan 31/03
WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual
CSP A--013
MASTER
Galley Potable Water System
Figure 21--20--1
WATER FILL PORT
FILL AND DRAIN
HANDLE
Potable Water Service and Drain Panel
DUSTCAP
FILL
VALVE
P
GALLEY
SINK
CABIN FLOOR (REF)
FILTER
PX SW
HEATED DRAIN
MAST (FWD)
GALLEY
VENT
DRAIN VALVE
GALLEY
CONTROL
PANNEL
COFFEE MAKER
AND WATER
DISPENSER
WITH DRAIN PAN
ELECTRONIC
CONTROL
UNIT
OVERFLOW
PORT
GALLEY
WATER TANK
ASSEMBLY
TANK
VENT
PRESSURE
MANIFOLD
Mechanical connection.
Fill line.
Overflow line.
Drain line.
Pressure supply line.
LEGEND
Electrical connection.
REV 56, Jan 31/03
Vol. 1 21--20--4
WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual MASTER
CSP A--013
Lavatory Water System
Figure 21--20--2
FILTER
WASHBASIN
　
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