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10-11
SECTION 10
– Plumbing Systems
Class A
10 –
Plumbing
Syste
m
s
Also open the Pressure-Temperature relief
valve at the top right portion of the tank to
prevent air locking in the tank while
draining.
6. 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. P/N 701705-01-000.)
NOTE:DO NOT burst air into the system. This
can damage the water pump. It is better
to let air in slowly.
7. Let air flow for five minutes until water is
completely drained out of faucets and drain
valves. Then close faucets one at a time.
8. Operate and hold toilet flush lever until water
is completely drained from toilet.
9. Turn air pressure off and disconnect water
purge adapters. Recap the city water
connection to avoid contamination by dirt or
insects.
10. Close all drain valves and faucets to avoid
contamination by dirt or insects. Reinstall
water heater drain plug and close P-T relief
valve.
11. Pour about one cup of non-toxic RV antifreeze
into the kitchen sink drain, bathroom sink
drain and shower drain. This prevents any
holding tank odors from entering the coach
during storage.
12. Place a bucket beneath the sewage drain valve
outlet and re-drain the sewage and waste
holding tanks of any clean water that entered
during “blow-out” procedure.
Close dump valves to prevent valve shafts
from rusting and to prevent entry by rodents
and insects. Refit the dust cap onto the drain
outlet.
Your drainage and fresh water systems are now
totally winterized.
City Water
Connection
City Water
Inlet
Blow-Out
Plug
Air Hose
CAUTION
Limit air pressure to 30 psi to avoid
damage to pump or water lines.
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