Tiffin Motorhomes 2014 Allegro Bus, Owner'S Manual

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 11 PLUMBING & BATH FIXTURES
11-9
Gray-Water Holding Tank
The gray-water holding tank is located in the underbelly of the vehicle. It is primarily used for the drainage
from the kitchen and bath sinks and the shower.
Wastewater Disposal
Both of the holding tanks terminate in a valve arrangement that permits
draining each tank separately or together (Figure11-11). It is
recommended to drain the black-water tank first before draining the
gray-water tank. This procedure permits the water from the gray tank to
wash the black-water residue from the drain lines and hose. The valves
that open to release the water are called gate valves.
The blade that closed the opening in the sewer drainpipes is connected
to the T-handle to release contents of the tank(s) when pulled. The
sewer line must be securely capped during self-containment use to
prevent leakage of waste materials onto the ground or pavement. Do
not pull the holding tank gate valve “open” when the protective cap is
installed on the pipe. Always drain the tank into an acceptable sewer
inlet or dump station.
Whenever possible, drain both 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 . 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 . 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. If the adapter is lost
or broken, another one can readily be purchased from any RV supply store. Once you have placed the adapter on the
drain hose, it can remain there for the life of the 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.
Figure 11-11. Sanitation Compartment Containing
Holding Tank Drains and Flexible Drain Hose