Tiffin Motorhomes 2015 Phaeton, Owner'S Manual, Page: 100 / 158

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PLUMBING & BATH FEATURES
the holding tanks prior to traveling. The carrying capacity of your vehicle will be reduced if water is
left in the black or gray tanks. The holding tanks should only be drained when they are at least ¾ full.
Doing this will provide a sufficient volume of water to allow the complete flushing of waste materials in
the drain lines and hose. If the tanks are not ¾ full, add enough water to allow for sufficient flushing.
To empty the wastewater tanks, connect the adapter, supplied with your vehicle, to the drain hose.
One end of the hose threads up through the hole in the bottom of the service compartment and the
other end of the hose feeds into the sewer at the dump station.
Unscrew the cap from the drain. Connect the hose, with the adapter in place, to the drain fitting.
Open the gate valve completely by pulling on the T-handle. The tank will start to drain as soon as the
T-handle is pulled. After you have drained the black-water tank, immediately drain the gray-water
tank. This procedure helps to flush the black water from the sewage hose.
When both the tanks are empty, flush them with a freshwater rinse before you close the valves. The
gray tanks are easily flushed by pouring a couple of gallons of water into a sink drain. The drain outlet
is engineered for quick release of the drain hose adapter. Always close the gate valves and secure the
end cap to prevent leakage while the vehicle is in transit.
After draining the black-water tank, it is recommended to add a holding-tank deodorant to help con-
trol the odor and break down the solids. Follow the instructions given on the holding-tank deodorant
package.
SEWER CONNECTION AND CAMPING
While using the motorhome, it is important to keep the black-waterholding-tank gate valve closed at
all times, except when dumping. This allows an ample amount of liquid to remain in the tank to pro-
vide a smooth flow through the gate and drain valves when dumping.
Sufficient liquid in the tank causes a swirling action that should take any accumulated solid wastes
with it. Accumulation of solid wastes in the black-water tank can be avoided by keeping the gate valve
closed when connected to the sewer connection. The gray tank can be kept open while hooked to a
sewer connection.
NOTE: When dumping, it is suggested to dump the black tank first, then the gray.