Passenger Water System Equipment Location
Figure 1 (Sheet 3)

C48296
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH LAVATORY B AND OR D WITH ú

 38-11-00
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 ú 13 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 4Nov 15/98 

LAVATORY
FAUCETS

LAV HOT
COLD FILTER  DRAINVALVE
SEE WASTEWATER SYSTEM TO DRAIN38-31-00
FITTING ONFUSELAGE
MANUAL OFF RESET
OVERHEAT SWHEATER ONCONTROL
SWITCH NEONLIGHT
CYCLING SW
M91  FORWARD LAVATORY WATER HEATER
M59  FOWARD LAVATORY INDICATOR
LIGHT
OVERHEAT
WATER HEATER
SWITCH
CONNECTOR

ELECTRICAL
COLD WATER
SUPPLY LINE

PRESS TO RESET
AFTER SUFFICENT

WATER HEATER COOLINGCOVER
115V AC
SEE A HEATER
CONTROL
SWITCH
WATER HEATER(COVER REMOVED)
A
AIR PRESSURIZATION
LINELAVATORY
DRAIN VALVE WATERQUANTITYTRANSMITTER
WATER HEATER
POTABLE WATERDRAIN LINE
OVERFLOW
LINE

FILL
LINE

DISTRIBUTIONLINE
POTABLE WATER TANK
DRAIN LINE
SAME AS
115V AC
BUS 1

M91 C105 LAVATORY D WATER HEATER OR LAV WATER HEATER
C1073 NO. 4 LAVATORY WATER HEATER
M1231 NO.4 LAVATORYBUS 2 C106 LAVATORY E WATER HEATER
115V AC
115V AC
BUS 2
C106 LAVATORY WATER HEATER - L AFT

115V AC
BUS 1
C104 LAVATORY A WATER HEATER OR
LAVATORY WATER HEATER - AFT

28V DC
BUS 1
C138 WATER QTY IND

P18-4 CIRCUIT BREAKER PANEL RELIEF VALVE
PRESSURIZED (OPENS ATAIR FROM 50 PSI) PNEUMATICMANIFOLD
FILTER  PRESSURE
REGULATOR
(25 PSI)

OVERFLOW LINE
FILL LINE
POTABLE WATERTANK FILL AND
TANK
OVER FLOW
DRAIN
VALVE
VALVE
T408 WATER QUANTITY XMTRSERVICEPANEL SKIN
TANK FILL DRAIN VALVEFITTING HANDLE AIR VALVE
FILL VALVE
OVERFLOW

HANDLE
FITTING

P25SERVICEPANEL POTABLE WATER
AIR PRESSURE
Potable Water System Schematic
Figure 2

AFT GALLEY
FWD GALLEY
SAME AS
M91

LAV WATER HEATER
SAME AS

LAVATORY E
2
M91
AFT LAV WATER HEATER
L AFT LAVATORY
1
WATER
1/2
1/4 3/4
WATER
EF

PUSH
QUANTITY FULL
FULL
CONTROLSWITCH 3/4
3/4
HOT WATER 1/2
1/2 OUTLET 1/4
1/4
PRESSURE EMPTY
EMPTY RELIEFVALVE
PUSH QUANTITYINDICATIONSWITCH
N17  WATER QUANTITYINDICATOR(STA 975 RBL 44WL 282)
1 AIRPLANES WITH LAVATORIES B AND D
2 AIRPLANES WITH LAVATORIES D AND E
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 38-11-00
 ALL  ú ú 13 Page 5 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4.  Fill and Overflow Valve
_______________________
 A.  The fill/overflow valve is a four-port valve used to fill the potable water tank. The fill/overflow valve attaches to an intercostal between floor beams to the left of the potable water tank. The fill/overflow valve handle is on the potable water service panel. In the open or service position, the fill/overflow valve allows the potable water tank to be filled. In the closed position, the fill/overflow valve seals the potable water tank so it can be pressurized.
 5.  Water Tank Drain Valve (Fig. 1 and 2)
______________________
 A.  The passenger water tank drain valve is two-port valve located behind the aft cargo compartment, below the passenger water tank and controls draining of the passenger water tank. A drain valve control handle is accessible on the water service panel.
 6.  Lavatory Drain Valve (Fig. 1, 2 and 3)
____________________
 A.  A manually operated drain valve is installed in the potable water line located below the water heater, inside each sink cabinet.
 B.  ALL EXCEPT D AND E LAVATORIES; the drain valve has 3 positions: SHUTOFF or OFF, DRAIN, and SUPPLY or ON. In the SHUTOFF or OFF position, all lines are completely closed. In the DRAIN position, all lines are completely open. In the SUPPLY or ON (normal) position, the water inlet and outlet lines are open and the drain line is closed.
　
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