Grand Design Momentum, Owner'S Manual

Page: 120 / 220

118
Plumbing Systems
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 Water
& 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 approved
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 emptied.
6. Remove, clean and store the sewer hose.
7. Close the sewer hose housing dust cap.
You can find the locations of many dump stations throughout
the United States and Canada in Woodall’s, Rand McNally
Camp Guide, Good Sam Camp Guide, KOA Kampgrounds
Camp Guide and various other publications. Some fuel stations
also have dump stations.
Please contact your dealer for assistance in the purchase
and installation of a sewer hose or sewer hose extension
(if needed).
Do not add automotive
antifreeze or caustic
chemicals such as laundry
detergents into the holding
tanks. Although these
products may have a
deodorizing effect, they
may damage the plastic
and rubber parts of the
plumbing system or the
components.
WARNING
It is important to prevent
solid waste buildup. Follow
the toilet manufacturer’s
recommended instructions
each time the black water
holding tank is emptied.
NOTICE
Sewer cap must be
securely in place
while the vehicle is
in motion.
Sewer Outlet Connection
Is Located under the RV
on the Off-Door Side