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feet altitude and these conditions are true:
* Waste drain ball valve is closed
* Waste tank is not full
* Lavatory flush switch operates.
The barometric pressure switch senses ambient pressure.
When the airplane is below 16,000 feet, the barometric pressure
switch is closed.
The waste drain ball valve proximity switch is closed when the
waste drain ball valve is closed.
If the tank is not full, the logic control module (LCM) sends an
enable signal to each flush control unit (FCU). Each lavatory
flush switch sends a signal to the FCU. The operational logic in
each FCU completes the circuit for the vacuum blower to
operate.
The barometric pressure switch stops operation of the vacuum
blower when the airplane is above 16,000 feet.
Three thermal switches in the vacuum blower stop the motor
operation if the temperature in the vacuum blower is more than
270F (132C). The thermal switches reset when the vacuum
blower temperature decreases to less than 270F (132C).
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-019
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM BLOWER - FUNCTIONAL DESCRIPTION
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM BLOWER - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The vacuum check valve prevents the pull of air from the waste
tank vent port by the vacuum blower.
Location
The vacuum check valve is in the aft cargo compartment on the
left side. The vacuum check valve is in the exhaust duct,
upstream of the waste tank vent port.
Physical Description
The vacuum check valve is a flapper type valve. A flow direction
arrow shows the correct installation orientation.
Functional Description
The vacuum check valve is spring-loaded to the closed position.
The vacuum check valve opens when there is sufficient
differential pressure between the waste tank and the waste
tank vent port.
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM CHECK VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-011
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM CHECK VALVE
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM CHECK VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-32-00-011
Purpose
The waste drain ball valve and linkage assembly control the
flow of waste out of the waste tank.
Location
The waste drain ball valve and linkage assembly are in the aft
cargo compartment on the left side. The waste drain ball valve
is in the drain line, between the waste tank and the waste
service panel. The linkage assembly is adjacent to the waste
drain ball valve, between the valve and the waste service panel.
Physical Description
The waste drain ball valve is a manually-operated two- position
ball valve. It has these parts:
* Ball valve
* Actuator lever
* Proximity switch.
There is an electrical connection at the proximity switch.
The linkage assembly has these parts:
* Control rod
* Uniball assembly
* Handle (not shown).
Functional Description
You pull the handle at the waste service panel to open the
waste drain ball valve. The handle transmits the movement
through the control rod to the actuator lever. The actuator lever
moves the waste drain ball valve.
The proximity switch stops the operation of the vacuum blower
when the waste drain ball valve is not closed.
Training Information Point
The waste drain ball valve connects to the drain lines with vband
clamps and gask-o-seal gaskets.
You must remove the waste drain heater blanket before you
work on the waste drain ball valve.
There is a clean-out line from the drain elbow to the blockage
removal valve.
WATER/WASTE - VACUUM WASTE SYSTEM - WASTE DRAIN BALL VALVE & LINKAGE ASSEMBLY
EFFECTIVITY
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