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is above 16,000 feet. The open switch does not let the vacuum
blower come on.
Location
The vacuum blower barometric switch is in the jackscrew
compartment. You get access to it through the section 48 access
and blowout door.
The barometric switch attaches to structure on the left side of
the fuselage.
Physical Description
The barometric switch has an aneroid capsule and an electrical
connector.
Functional Description
The capsule senses the ambient air pressure. As the pressure
outside decreases, the capsule expands. When the capsule
expands to a specific size, it opens an internal switch.
Interfaces
The vacuum blower barometric switch is part of the control
circuit for vacuum blower operation.
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WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM BLOWER BAROMETRIC SWITCH
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Power
Transfer bus 1 supplies 115v ac three-phase power for vacuum
blower operation.
The control power is 28v dc from bus 1.
Functional Description
The vacuum blower operates when the airplane is below 16,000
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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WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM BLOWER - FUNCTIONAL DESCRIPTION
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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.
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WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM CHECK VALVE
WATER/WASTE - VACUUM WASTE SYSTEM - VACUUM CHECK VALVE
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Purpose
The waste drain ball valve and linkage assembly control the
　
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