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WATER/WASTE - WATER TANK PRESSURIZATION - PRESSURE LIMIT SWITCH
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-004
Purpose
The compressor cut-out switch stops the operation of the air
compressor when the water service panel door is open.
Location
The compressor cut-out switch is on the water service panel at
the aft section of the fuselage, bottom right side.
Description
The compressor cut-out switch has these components:
* Sensor assembly
* Actuator magnet.
The compressor cut-out switch opens when the water service
panel door is open.
WATER/WASTE - WATER TANK PRESSURIZATION - COMPRESSOR CUT-OUT SWITCH
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
38-42-00-011
WATER/WASTE - WATER TANK PRESSURIZATION - COMPRESSOR CUT-OUT SWITCH
WATER/WASTE - WATER TANK PRESSURIZATION - COMPRESSOR CUT-OUT SWITCH
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-011
Functional Description
The air compressor operates with 115v ac, three-phase power.
The compressor control relay energizes when these conditions
are true:
* Water service door is closed (compressor cut-out switch is
closed)
* Water tank pressure is less than 30 psig (pressure limit
switch is closed)
* 115v ac main bus 1 is on.
The air compressor operates when the compressor control
relay energizes.
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
38-42-00-009
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 38-42-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-42-00-009
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WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
38-42-00
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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
General
The water tank pressurization system uses pressurized air from
the pneumatic system or the air compressor to pressurize the
water tank.
Pneumatic System
The pneumatic system supplies pressurized air to the water
tank when the pneumatic system is on.
The pneumatic system supply line gets air from a tap on the
pneumatic manifold forward of the APU check valve.
An in-line air filter cleans the air in the pneumatic system supply
line.
A pressure regulator controls the pneumatic system supply line
pressure to a maximum of 35 psig.
Air Compressor
The air compressor supplies pressurized air to the water tank
when the pneumatic system is off and these conditions are true:
* Pressure in the water tank is less than 30 psig (pressure limit
switch is closed)
* Water service panel door is closed (compressor cut-out
switch is closed)
* 115v ac main bus 1 is on.
The air compressor gets air from a muffler above the ceiling of
the cargo compartment. An air filter at the inlet of the air
compressor cleans the air in the air compressor supply line.
The pressure limit switch opens and stops the operation of the
air compressor when the air pressure in the water tank
increases to 40 psig. When the pressure decreases to 30 psig,
the pressure limit switch closes and the air compressor starts.
Training Information Point
WARNING: SEAL THE CARGO COMPARTMENT WITH THE
LINING. OBEY THE INSTRUCTIONS IN THE
SPECIFIED PROCEDURE WHEN YOU INSTALL
THE LINING. IF YOU INSTALL THE LINING
INCORRECTLY, THE FIRE EXTINGUISHING
AGENT OR SMOKE CAN GET INTO THE
PASSENGER COMPARTMENT DURING A FIRE.
To get access to the water tank pressurization system
components, you remove the cargo compartment lining. When
you are done, you must replace and seal the cargo
　
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