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supply line.
The check valve has these features:
* Tube fittings
* Wrench flats
* Flow direction arrow.
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Pressure Relief Valve
The pressure relief valve prevents an over-pressure condition
in the water tank pressure lines.
The pressure relief valve has these features:
* Wrench flats
* Tube fitting
* Pressure relief actuator.
The tube fitting connects to the same manifold as the two
pressurization sources.
If pressure in the pneumatic supply line increases to 60 psig, the
pressure relief valve opens. The valve resets at 55 psig.
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
38-42-00-012
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
WATER/WASTE - WATER TANK PRESSURIZATION - PNEUMATIC EQUIPMENT
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 air compressor pressurizes the water tank when the
pneumatic system is not on.
The inlet air filter removes particles of unwanted material from
the air that goes into the water tank.
Location
The air compressor is on the left side of the aft cargo
compartment. You remove the forward waste access panel to
get access to the air compressor. The air compressor attaches
to the lower side the vacuum blower support shelf.
Physical Description
The air compressor has these parts:
* Inlet air filter
* Electrical connector
* Inlet
* Outlet
* Pressure relief valve.
The inlet air filter has these parts:
* Noise baffle
* Filter assembly
* Perforated disk
* Snap ring
* O-ring (2)
* Housing.
Functional Description
The three-phase AC motor operates the air compressor to
pressurize the water tank. The motor starts when the pressure
limit switch senses that tank pressure is less than 30 psig. The
motor stops when tank pressure is 40 psig. The air compressor
pulls air through the inlet air filter from the cargo ceiling area.
The inlet air filter element is a 40 micron, layered disk filter. The
filter housing attaches to the inlet side of the air compressor.
The pressure relief valve prevents the air compressor from
over pressurization. The pressure relief valve opens at 90 psig.
Training Information Point
You can replace the inlet air filter element.
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR/INLET AIR FILTER
EFFECTIVITY
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WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR/INLET AIR FILTER
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR/INLET AIR FILTER
EFFECTIVITY
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Purpose
The pressure limit switch controls the operation of the air
compressor.
Location
The pressure limit switch is in the aft cargo compartment
behind the aft bulkhead. You must remove the water tank
access panel to get access to it.
The pressure limit switch attaches to the top of the water tank.
Physical Description
The pressure limit switch has these features:
* Electrical connector
* Tube fitting
* Wrench flats.
Functional Description
The switch starts the air compressor when the pressure in the
water tank is 30 psig or less. The switch stops the air
compressor when the pressure in the water tank is 40 psig.
WATER/WASTE - WATER TANK PRESSURIZATION - PRESSURE LIMIT SWITCH
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WATER/WASTE - WATER TANK PRESSURIZATION - PRESSURE LIMIT SWITCH
　
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