Grand Design Imagine, Owner'S Manual

Page: 99 / 180

97
Plumbing Systems
moved before passing the cleanout tool through the piping.
Passing a mechanical cleanout tool through the waterless
valve may cause damage to the internal seal that may poten-
tially allow sewer gases to escape to the RV interior.
VENTS & VENT PIPES
Another important part of this system is the vent pipes and
vents that release air from the grey and black water holding
tanks. The exterior vent cap is attached to the roof and must
be kept clear of obstructions to perform as intended. On some
models, the vent pipe may be part of the drainage system
referred to as a "wet vent" (water flows downward as air flows
upward in the same pipe).
BLACK/GREY WATER HOLDING TANKS
When connected to the sewer drain line at a campground,
keep the “black tank drain” valve closed until the holding tank
is at least ¾ full. This should provide sufficient water to assist
in complete draining of the black water holding tank. Repeat
as needed. Never leave the black tank drain in the open posi-
tion continuously when connected to the campground sewer
system.
EMPTYING THE BLACK & GREY WATER TANKS
The two grey tank drain valves and one black tank drain valve
(also called dump valves) are located in the docking station.
Always drain the black water holding tank first so the following
grey tank waste water can help rinse any solids or debris from
the dump outlet and sewer hose.
1. To make drainage easier, level the RV.
2. Locate the “Sewer Outlet Connection” and remove the
sewer hose housing dust cap, and attach your sewer
hose (customer supplied).
3. Place the other end of the sewer hose into the ap-
proved dump station.
4. Open the black tank dump valve by carefully pulling it
out towards you (close it by pushing it shut when the
black water holding tank is emptied).
5. Similarly, open each grey tank dump valve (one at a
time) and close it after each grey holding tank is emp-
tied).