Hi
Jck2016, welcome to iboats.
Being that you have the later model design VacuFlush Sanitation System, the overboard Macerator discharge pump system is now an optional feature on the Four Winns boats.
Bear in mind that when four wins builds their boats, they typically install all the electrical wiring and switches to all their boats even if the boat was built without the items installed at the factory so that should/when someone decide to order that component at a later date, it will be much easier for them to install as the wiring will already be in place...So with that, there sometimes are many dead/useless switches on these boats.
Should your boat have the overboard Macerator discharge pump system, then there should be a thru-hull discharge valve for sure and some of the older models possibly a white pump like seen at the bottom of the following fourwinns link,
http://www.smwebhead.com/phpBB3/viewtopic.php?f=6&t=8296 (< Keep reading below before you open this link.)
If you don't have the white pump like seen above, then again if you do have the option installed, then the Macerator might be (< most likely.. See highlighted Bold below) installed on top of the VacuFlush tank like seen/described in this following link,
http://www.smwebhead.com/phpBB3/viewtopic.php?f=6&t=12457
A. VacuFlush? Sanitation System
The.VacuFlush?.sanitation.system.is.standard.on.the. 318.Vista?..The.system.eliminates.the.unpleasant. sulfide odors which plague saltwater systems. Flush water.is.no.longer.drawn.through.the.through-hull. fittings, seacock, and vented loop. It also extends the life.of.the.system.components.by.eliminating.salt. water.and.impurities.from.accumulating.in.the.system. over.time.
The.VacuFlush?.toilet.operates.in.a.different.way.from. other.marine.toilets..VacuFlush?.systems.use.a.small. amount of water (a little more than a pint) per flush in addition.to.a.simple.vacuum..The.toilet.is.connected.. to.the.fresh.water.system..Fresh.water.is.the.key.to.an. odor.free.bathroom.compartment..VacuFlush?.toilets. are.equipped.with.an.integrated.vacuum.breaker. which.prevents.the.possible.contamination.of.the. potable/fresh.water.supply..See.Figures.J-5.&.J-6... Also.refer.to.the.manufacturer?s.literature.included.in. the.owner?s.packet.
NOTICE The VacuFlush? (TOILET) switch located in the head must be ON in order for the toilet to flush & recharge.
To.operate:
1. To add water to the toilet before using, raise flush lever.until.desired.water.level.is.reached..Generally, more water is required only when flushing solids..See.Figure.J-5.
2. To flush toilet, press flush lever sharply down to the floor until contents clear bowl. A sharp popping noise.is.normal.when.the.vacuum.seal.is.broken. and the flushing action begins. Be sure to hold lever down for 3 seconds. If flush lever is accidentally.released.before.waste.clears.bowl,.. do not attempt to flush toilet again until vacuum pump.stops.running..A.small.amount.of.water. should remain in the bowl after flushing.
3.. Do.not.dispose.of.sanitary.napkins.or.other.nondissolving.items.in.toilet,.such.as.facial.tissue.or. paper.towels..These.items.can.cause.plugging.of. the.system..Refer.to.the.?Deodorants.and.Special. Tissue? section in the manufacturer?s manual for more information.
Figure J-7: Overboard Discharge Option:
NOTICE The discharge pump must be used to discharge waste overboard. However, DO NOT use the discharge pump to discharge waste at a pumping station.
To.operate.the.overboard.discharge.system:
1.. The.discharge.valve.is.located.in.the.engine. compartment.labeled.HEAD.DISCHARGE..To. open,.turn.the.valve.so.that.the.handle.is.parallel. to the flow of the valve. The waste deck plate cover.must.be.tightened.securely.for.the.overboard.discharge.system.to.operate.
2.. Turn.ON.the.overboard.discharge.switch.which.is. located.in.the.head.on.the.switch.panel..Allow.the. discharge.pump.to.run.until.the.storage.tank.is. empty..The.sound.of.the.pump?s.motor.load.and. speed.will.change.when.the.tank.becomes.empty.
3.. Turn.the.overboard.discharge.switch.off.
4.. Turn.the.head.discharge.valve.handle.to.the. closed.position,.and.secure.it..This.thru-hull.valve. (seacock).must be closed to prevent water from being forced back into the system.
Figure J-6: VacuFlush? Waste Holding Tank System
B. Head With Overboard Discharge
This option is available on the 318 Vista? models... The head toilet operations are the same as the systems described earlier. A discharge pump is incorporated into the VacuFlush? waste holding tank system. An additional hose with a seacock has also been installed for overboard discharge. Refer to Figure J-7.
The next following link is an online Four Winns owners manual for the 318 Vista, the watering system can be tricky at remembering how to use it if you don't do it often enough. So for your convenience if interested in wanting to read through each system, The Water and Waste Systems for the 318 starts on page 85 and runs through page 112.
http://www.fourwinns.com/upload/Documents/OwnersManuals/2008/318-Vista-Manual.pdf
Hope this helps, good luck.
