7-13
SECTION 7 –
PLUMBING
9.
Connect Air Pressure.
After water has
stopped draining at all faucets and drain
valves, leave faucets open and connect a
“blow-out” plug to the city water connection
on the coach. Then use a compressed air hose
regulated to 30 psi or less to force air through
the system. A blow-out plug can be purchased
at any Winnebago
®
or Itasca
®
dealer.
NOTE: DO NOT burst air into the system. This
can damage the water pump. It is better
to let air in slowly.
10.
Let air flow for five minutes
until water is
completely drained out of faucets and drain
valves. Then close faucets one at a time.
11.
Drain Toilet.
Operate and hold toilet flush
lever (or electric wall switch, if your coach is
equipped with an electric flush toilet) until
water is completely drained from toilet.
12.
Turn air pressure off
. Disconnect water
purge adapters. Recap the city water inlet to
avoid contamination by dirt or insects.
After Disconnecting Air Pressure
13. Close all waterline and tank drain valves and
all faucets to avoid contamination by dirt,
insects, or rodents.
14. Reinstall the Water Heater drain plug and
close the P-T Relief Valve.
15. Pour about one cup of RV antifreeze down
each drain for the galley sink, lavatory sink,
and shower/tub. This fills the drain trap pipes
to prevent holding tank odors from entering
the coach during storage.
NOTE: It is not necessary to add antifreeze to
the toilet since the flush valve will be
closed.
Do not add automotive antifreeze or
caustic chemicals such as bleach or
laundry detergents into the toilet bowl or
holding tanks. Although these products
may have a deodorizing effect, they may
damage plastic and rubber parts in the
system.
16. Empty the water pump strainer filter bowl to
avoid water freezing and cracking the filter
bowl. See “Water Pump” previously in this
section.
Dump and Clean Holding Tanks
17. Completely drain the sewage and waste water
holding tanks at an approved waste disposal
site. Drain the sewage tank first so the
following waste water can rinse any waste
solids from the dump outlet and sewer hose.
18. Flush the sewage tank using the Black Waste
Tank Flush Inlet (if equipped).
19. Close dump valves and refit the dust cap onto
the drain outlet.
This will inhibit rust formation on valve shafts
and prevent entry and contamination by
airborne debris, insects, and rodents.
NOTICE
Limit air pressure to 30 psi to avoid
damage to equipment.
Pressure-Temperature Relief Valve
(Lift handle only when water heater is cold)
City Water
Connection
Fresh Water
Inlet
Blow-out
Plug
Air Hose
