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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The water heating system supplies hot water to the lavatory hot
water faucet.
Abbreviations and Acronyms
* ac - alternating current
* C - celsius
* F - fahrenheit
* psig - pounds per square inch, gauge
* REF - reference
* TYP - typical
* v - volts
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The water heater increases the temperature of water supplied
to the lavatory hot water faucet.
Location
There is a water heater in each lavatory. You open the sink
cabinet door to get access to the water heater.
Physical Description
The water heater has these parts:
* Power switch
* Temperature selector switch
* Power indicator light
* Cover
* Overheat switch
* Pressure relief valve.
The temperature selector switch sets the water temperature to
one of these three temperatures:
* LOW (105F/40C)
* MEDIUM (115F/46C)
* HIGH (125F/52C).
The power indicator light shows that power is available and that
the overheat switch is closed (no overheat).
The overheat switch opens when the water temperature is more
than 170F (76C).
The pressure relief valve opens if pressure inside the water
heater is more than 140 psig.
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Functional Description
When the power switch is in the ON position, 115v ac power
goes to the control electronics.
The temperature selector switch sets the temperature of the
water heater. The temperature selector switch has three
positions:
* LOW (105F/40C)
* MEDIUM (115F/46C)
* HIGH (125F/52C).
The sense probe (thermistor) gives data on the temperature of
the water in the water heater.
If the water is too cold, the control electronics connects power to
the heater elements. If the water is at the correct temperature,
the control electronics disconnects power from the heater
elements.
The overheat switch is a fail-safe device that is a back up to the
control electronics. The overheat switch opens the power circuit
if the water temperature is more than 170F (76C). If the overheat
switch opens, you must manually reset the overheat switch.
Training Information Point
If the power switch is ON and the power indicator light is off, the
water heater may have been too hot and opened the overheat
switch. You must remove the heater cover to reset the overheat
switch.
The rubber cover on the overheat switch isolates electrical
power. Do not use a sharp object to reset the overheat switch.
Open the circuit breaker for the water heater when you drain the
potable water system.
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