Airstream International Serenity 23CB 2020 Owner's Manual page 81

The main consideration in winterizing your trailer is
to guard against freeze damage to the fresh water
system lines, tank, and pump; the waste drain system
including the traps and tanks; the water heater; and the
batteries.
To completely winterize your trailer follow this
procedure:
1� Level the trailer from side to side and front to rear.
Open all faucets.
2� Turn the water pump switch to the ON position to
expel water from the storage tank
3� Open all drain valves including drain plug or valve
on water heater and exterior water service valve.
4� While the water is draining from the system, open
and flush the toilet-flushing valve. Depress hand
spray lever while holding the spray head down
inside the bowl. Depress hand spray thumb button
on the telephone shower head while holding down
inside the tub and drain all water from the flexible
hose. Unscrew the heads on both spray units and
store.
5� Turn the pump switch OFF after all water has been
removed from the storage tank.
6� Disconnect outlet hose from water pump.
7� If your unit has a winterization kit installed, open
valve to the winterizing position and remove plug.
If your unit does not have this valve, disconnect
the water pump inlet connection. Turn the pump
on until all the water is expelled. This water,
about 1/2 cup, can be caught in a towel or rag.
8� Lower the front of the trailer as far as the jack will
allow until water ceases to drain, and then crank
the jack up as high as it will go and allow any
remaining water to drain out.
2020 International
9� After the water has stopped running from the drain
lines, apply 50 lb. of air pressure at the city water
inlet. An air-to-city water adapter is available from
your dealer's RV accessory store. Be sure the
toilet valve, all drain valves, and faucets are open,
and pump outlet hose is disconnected. This can
be done at a service station and will force any
remaining water from the water heater and remove
any water that may be trapped in low areas.
10� Pour a cup of approved non-toxic RV antifreeze
that has been listed by a recognized testing
authority such as Underwriter Lab into the lavatory,
sink, and tub drains to prevent trap freeze-up.
11� Be sure to open the waste-holding tank dump
valves, and drain and flush the tanks thoroughly
(this is very important as the sewage in the tanks,
if frozen, could seriously damage the tanks)� Plan
ahead and have this done at a dump station.
12� Remove the batteries from your trailer and store
in a cool, dry place where there is no danger of
freezing. It is very important for optimum life of a
battery to check it periodically and to keep it fully
charged�
13� Remove any items (food, cosmetics, etc.) from
trailer interior that might be damaged by freezing,
or that might damage the trailer if containers
should break.
CAUTION
Remove all RV antifreeze spillage from all drain
and faucet parts after winterizing. Failure to do
so could result in damage to the finish of the
plumbing fixtures.
An Optional, but not necessary, method for winterizing
protection, is to add a non-toxic antifreeze (approved
for drinking water system) to the water lines using the
following procedure:
1� Reconnect all lines except the hose to the pump
inlet port. If you have the winterization kit installed,
just reconnect the outlet hose. Close all drain
valves.
2� Turn water heater bypass valve to bypass position.
Refer to Water Heater Bypass Valve illustration.
3� If you do not have the winterization kit, attach a
length of hose to the pump inlet port. This piece of
hose should be long enough for the free end to be
inserted into and reach the bottom of the antifreeze
container�
Maintenance
8-15