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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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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D633A101-GUN Feb 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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
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WATER/WASTE - WATER TANK PRESSURIZATION - PRESSURE LIMIT SWITCH
WATER/WASTE - WATER TANK PRESSURIZATION - PRESSURE LIMIT SWITCH
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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
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WATER/WASTE - WATER TANK PRESSURIZATION - COMPRESSOR CUT-OUT SWITCH
WATER/WASTE - WATER TANK PRESSURIZATION - COMPRESSOR CUT-OUT SWITCH
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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
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WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
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WATER/WASTE - WATER TANK PRESSURIZATION - AIR COMPRESSOR - FUNCTIONAL DESCRIPTION
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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.
　
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