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To get access to the flush switch, you must first remove the
flush switch cover. You then remove the collar.
The toilet assembly is behind the toilet shroud. You must
remove the toilet shroud to get access to the toilet assembly.
The toilet shroud has a seat and cover. There is a cutout for the
toilet manual shutoff valve handle on the lower part of the
shroud.
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Purpose
The flush switch starts the flush cycle for the vacuum waste
system.
Location
Each lavatory has a flush switch adjacent to the toilet assembly.
You must remove the flush switch cover and the collar to get
access to the switch.
Physical Description
The flush switch is a momentarily closed switch.
Functional Description
The flush switch controls the vacuum waste system flush cycle.
The flush switch sends a signal to the flush control unit on the
toilet assembly.
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Purpose
The toilet assembly collects human waste material. The toilet
assembly operates the vacuum waste system to send the waste
to the waste tank.
Location
There is a toilet assembly in each lavatory.
Physical Description
The toilet assembly has these parts:
* Toilet bowl
* Rinse ring
* Pedestal
* Rinse valve
* Anti-siphon valve
* Flush valve
* Manual shutoff valve
* Manual shutoff handle
* Flush control unit (FCU).
The toilet bowl and the pedestal are stainless steel. The internal
surface of the toilet bowl has a layer of non-stick material on it to
keep the toilet bowl clean of toilet waste.
The rinse ring is a stainless steel tube. The rinse ring attaches
to the inside, upper rim of the toilet bowl and connects to the
rinse valve through the anti-siphon valve.
The rinse valve gives water for toilet flush. The rinse valve is a
flow through, solenoid operated, poppet valve with an internal
filter. The rinse valve opens and self drains when the potable
water system is not pressurized.
The anti-siphon valve prevents backflow of water from the toilet
bowl into the potable water system.
The flush valve keeps the flow path between the toilet bowl and
the waste line closed. The valve opens to let waste material
move from the toilet bowl to the waste lines and to the waste
tank. The flush valve is an electrically actuated, reversible,
rotating disk valve. The motor has built-in thermal overload
protection.
The manual shutoff handle closes the manual shutoff valve.
Functional Description
The flush cycle starts when a flush signal is received from the
flush switch. Each flush cycle has the following steps:
* Rinse valve opens to rinse the toilet bowl
* Rinse valve closes
* Flush valve opens to drain the toilet contents.
* Flush valve closes.
When the rinse valve is open, eight ounces of water flushes the
toilet bowl.
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