Winterizing And Storage; Black Water Tank Flush; Drain Systems Cleaning - Airstream International Serenity 23CB 2020 Owner's Manual

Maintenance
Draining the tanks as described will protect them from
freezing during storage. When traveling in sub-freezing
temperatures, use a winterizing solution designed for
RV use. Follow the directions on the container.
1� Black Water (Main) Dump Valve
2� Light
3� Light Switch
4� Auxiliary Tank Dump Valve
5� Drain Cap
3
2
1
1� Wastewater (Gray) Tank Valve
2� Light
3� Light Switch
4� Sewage (Black) Tank Valve
5� Drain Cap (Drain Hose Hookup)
8-14
5
4

Black Water Tank Flush

The trailer has a water hose connector specifically
for flushing the Black Water Tank. To use, hook up a
garden hose and turn it on. Within the tank, a head with
multiple holes will spray the interior surface of the tank.
Once the tank is about half full, turn the garden hose
off and flush the water from the tank using the dump
valve. The valve should be closed for the first couple of
minutes, and then opened to let the water out in a rush.
Repeat as needed.
It is recommended the tank flush be used on a regular
basis or the holes on the spray head may become
clogged�

Drain Systems Cleaning

The only cleaning agents that can be used without
causing harm to the system are household ammonia
and tri-sodium phosphate in small quantities. Do not
use any product that contains any portion of petroleum
distillates. This type of product will attack the rubber
seals of your toilet and dump valve. Also, do not use
any dish detergent or abrasive cleaners. All products
should be marked as approved for ABS drainage
systems.

Winterizing and Storage

When storing your trailer for short or long periods,
use the same precautions as you would in your own
home in regard to perishables, ventilation, and rain
protection. In addition, for prolonged storage periods,
flush all the drain lines and the holding tanks. Also
drain the entire water system including the water heater
and the water storage tank. Instructions for draining the
water system are explained in the following paragraphs
on winterizing�
2020 International