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 C.  D AND E LAVATORIES; the drain valve has only the open and closed positions. In the open position, the pointer on the valve handle is pointed to SUPPLY/DRAIN or ON. In the closed position, the pointer is pointed to SHUTOFF or OFF.
 7.  Lavatory Washbasin Faucet (Fig. 1, 2 and 3)
_________________________
 A.  Each lavatory washbasin has a water faucet. Each faucet has a hot and cold water valve with a common mixing spigot. The faucets are self-venting so they need not be opened to drain the potable water system. The washbasin stopper is spring-loaded closed. The stopper control lever must be held open until the basin is empty. The basin overflow drain is not stoppered.
 8.  Water Heaters (Fig. 1, 2 and 3)
_____________
 A.  The ON-OFF switch is normally ON. This lights the indicator light and lets the water heater cycle on and off automatically until the switch is turned OFF.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SPIGOT WATER FAUCETSINK SINKOVERFLOW
LINE
HOT WATER
SUPPLY LINE

COLD WATER
SUPPLY LINE

AIR VENT
LINE COLD WATER SUPPLY LINE
TOILET
OVERBOARD
VENT LINE

WATER HEATER COVER
WATER HEATER WATERTOILET VACUUM
ELECTRICAL
HEATERVENT LINE
CONNECTOR
WATER DRAIN LINE WASTE WATER HEATER PRESSURE
SWITCH RELIEF VALVE
TOILET
TANK
3-WAY SUPPLY & DRAIN VALVE
SUPPLY & DRAIN LINE
MUFFLER
VENT LINE FOR ATMOSPHERIC DISCHARGE
Sink Cabinet Passenger Water System Components (Typical)
Figure 3 (Sheet 1)

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 LAVATORIES  ú
 ú 04 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 7Jul 15/93 

A 
737-300/400/500MAINTENANCE MANUAL 
WATER 
FAUCET 
ACTUATOR BUTTONS FOR 
THE HOT AND COLD WATER  ACTUATOR BUTTON FOR 
THE WASHBASIN STOPPER 
HOT WATER 
SUPPLY LINE 
COLD WATER 
OVER FLOW LINE  SUPPLY LINE 
WATER 
HEATER 
WASTE WATER 
DRAIN LINE  WATER  MUFFLER 
HEATER 
SWITCH 

DRAIN VALVE FOR THE LAVATORY
SELECTOR
RUMBOLD LAVATORY (EXAMPLE)
Sink Cabinet Passenger Water System Components Figure 3 (Sheet 2)
A09362
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 LAVATORIES  ú
 ú 09 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 8Mar 15/95 

A
737-300/400/500MAINTENANCE MANUAL
 B.  WATER HEATERS WITH THE TEMPERATURE SELECT SWITCH; The temperature select switch is on the bottom of the water heater. The temperature select switch adjusts the control thermostat to give water that can be heated to one of these temperature ranges. The ranges are: 101°F to 109°F (LOW), 111°F to 119°F (MED) and 121°F to 129°F (HIGH). If the control thermostat fails in the closed position, the overheat switch will cut power to the heater circuit when the temperature reaches approximately 170°F.
 C.  WATER HEATERS WITHOUT THE TEMPERATURE SELECT SWITCH; The water heater will automatically heat the water to the temperature of approximately 125°F. The control thermostat opens the heater circuit when the temperature goes above 125°F and closes when the temperature goes below 125°F. If the control thermostat does not open at 125°F, the overheat switch will cut power to the heater circuit when the temperature reaches approximately 195°F.
 D.  An overheat condition requires manually resetting the overheat switch. The overheat switch is beneath the water heater top cover. If the pressure in the heater reaches 140 psi, a pressure relief valve opens. The relief valve closes again at about 130 psi.
　
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