SECTION 7 –
PLUMBING
7-14
heating element. Drain the water heater by
removing the plug from the base of the water
heater tank, accessible from the outside of the
coach (requires socket and ratchet).
•
Also, open the Pressure-Temperature Relief
valve at the top right portion of the tank to
prevent air locking in the tank while draining.
8.
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.
9.
Let air flow for five minutes
until water is
completely drained out of faucets and drain
valves. Then close faucets one at a time.
10.
Drain Toilet.
Operate and hold toilet flush
lever until water is completely drained from
toilet.
11.
Turn air pressure off
. Disconnect water
purge adapters. Recap the city water inlet to
avoid contamination by dirt or insects.
After Disconnecting Air Pressure
12. Close all waterline drain valves, tank drain
valves, and all faucets to avoid contamination
by dirt, insects, or rodents.
13. Reinstall the water heater drain plug and close
the Pressure-Temperature Relief valve.
14. 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
Water Heater Drain Plug
(Remove with socket)
Pressure-Temperature Relief Valve
(Lift handle only when water heater is cold)
NOTICE
Limit air pressure to 30 psi to avoid
damage to equipment.
City Water
Connection
Fresh Water
Inlet
Blow-out
Plug
Air Hose
