Landmark 365 User Manual - page 23
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Landmark 365 User Guide V1.1.pdf
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Version 1.1, March 10, 2016
the tank. Using the timer function on your smart phone is one way to keep track of how much water is
being added to the black tank through the flush system. If you assume water flow of 5 gallons per
minute, setting a timer for 6 minutes will add about 30 gallons to the black tank. If you’ve emptied the
tank and are filling it with the Black Tank Flush to facilitate a 2
nd
emptying, 30 gallons should be enough.
If your floor plan has a 2
nd
bathroom, there will be a separate black tank for that bathroom, along with a
separate Black Tank Flush Inlet for that tank.
Tank Valve Handles
In a single bathroom floor plan, the holding tank gate valve pull handles are located in the UDC. The
bottom handle is for the Black tank. The middle handle is for Gray #2, which is the galley. The top
handle is for Gray #1, which collects water from the bathroom sink and shower, and the washing
machine.
CAUTION: Overfilling the black tank can create a huge mess inside the RV and could damage the
tank and/or plumbing connections. Do not allow yourself to be distracted while operating the Black
Tank Flush. It’s also a good idea to notify other parties using the trailer that you are dumping the
tanks, so they know not to use the toilet. If the tank is overfilled, there will be upward pressure on
the toilet, sewage may rise into the vent that goes to the roof and could pour out on the roof and
run down the sides of the RV. Sewage can also escape into the underbelly if tank connections are
forced apart by the internal pressure. Using a timer will help avoid these scenarios.