SECTION 10
– Plumbing Systems
10-6
Class A
4. Open the black water valve (black handle)
with a quick pull and make sure there are no
sags in the hose. Move the hose gently about
to dislodge any waste and ensure complete
drainage. Close black water valve as soon as
tank is empty.
NOTE: Do not open the gray water valve until
the black water tank is drained and dump
valve closed to avoid sewage back-up
into gray tank. Gray water also rinses
any black water solids from the drain
hose.
5. Open the gray water valve (gray handle). Be
sure there are no sags in the hose to ensure
complete drainage. Close gray water valve as
soon as tank is empty.
6. After both tanks have been drained, run
several gallons of water into the sewage tank
through the toilet. Then open sewage dump
valve and drain the tank again. Close valve
and replace dust cap securely.
7. Add an odor control chemical to the sewage
holding tank. These chemicals are available at
most R.V. stores.
8. Rinse sewer hose thoroughly with water and
stow.
NOTE:We recommend that you dump all holding
tanks before traveling to avoid carrying
unnecessary weight.
Using On-Site Sewer Hook-Ups
The drain hose may remain attached to the
dump outlet and be routed out the bottom of the
compartment while the motor home is parked and
connected to an on-site sewage hook-up.
When using a sewer hook-up, keep the dump
valves closed until a tank becomes full or when
preparing to leave the site. This keeps the solids
in suspension, allowing them to be carried out
with the liquids when the dump valve is opened.
If the valve is left open, the liquids will drain off,
leaving solids in the tank. Should this
accidentally happen, disconnect the hose, fill the
tank about half full with water, and drive a few
miles to dislodge the solids. A few starts and
stops will aid in the process. Then reconnect the
hose and drain in the normal manner.
HOLDING TANK LEVEL
INDICATIORS
The holding tanks may be monitored on the
wall mounted monitor panel.
Press the “Levels Test” switch to check the
appropriate level in each tank.
See
System Monitor Panel in
Section 6
for
further information on the monitor panel and
checking tank levels.
WATER LINE AND TANK
DRAIN VALVES
The water drain valves are used to drain water
from the water tank and the water supply lines
when preparing the motor home for storage or
when sanitizing the water system.
To open or close the drain valves, turn the
handles in the directions indicated by the
following illustration.
Drain valve locations are listed on the
following pages.