Winnebago Sunova Operator's Manual page 91

then close.
Do not forget the exterior shower/wash station
knobs (if equipped).
8. Press the toilet flush pedal and hold until
antifreeze begins flowing into the toilet.
Leave small amount of antifreeze that remains
in the bowl.
When Done Adding RV Antifreeze
9. Turn Water Pump switch off.
10. Turn the Winterization valve so it points
toward the waterline to the water pump. This
will stop the flow from the antifreeze siphon
tube and revert the tank line flow to the water
pump.
11. Replace the protective cap onto the end of the
antifreeze siphon tube to keep out insects and
debris when not in use.
Drain Water Heater
12. Turn off the Water Heater power switch
before draining the water heater tank to avoid
damage to the heating element.
13. 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).
Water Heater Drain Plug
(Remove with socket)
C AU T I O N
Hot water can escape from tank causing
injury. Operate relief valve or remove
drain plug only when the tank water is
cold.
• Also, open the Pressure-Temperature Relief
valve at the top right portion of the tank to
prevent air locking in the tank while
draining.
Pressure-Temperature Relief Valve
(Lift handle only when water heater is cold)
14. Reinstall the water heater drain plug and close
the P-T Relief valve when drained.
Drain Optional Appliances
15. At this time, if your coach is equipped with an
optional refrigerator ice maker, the waterlines
for that must also be drained.
(See "Winterizing Optional Appliances"
instructions at the end of this section.)
If not, proceed to the next numbered step.
Fill Drainage System P-Traps
16. 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.
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. 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.
Your drainage and fresh water systems are now
winterized.
See instructions for removal from storage in
SECTION 7 –
PLUMBING
7-15