Airstream A-Series 2006 Owner's Manual page 58

PLUMBING & HEATING
You may normally keep the RV plugged into shore power during cold winter months
and presume that it is unnecessary to maintain antifreeze levels within the hydronic
heating system. Relying on continuous shore power supply to protect the Hydro-Hot
system from freezing is risky when taking into account that the shore power supply
may be interrupted due to a black out, or because the shore power cord has inadver-
tently disconnected from the source.
Evacuating the hydronic heating system of water when preparing the RV for winter
storage by blowing out the lines with compressed air may not be effective in com-
pletely draining water out of the long length of tubes inside of the system. Moisture
left within the tubes could collect and settle at the bottom loop. If temperatures during
storage reach freezing, that moisture may expand and crack the tubes.
For additional winterizing protection, add non-toxic antifreeze (approved for drinking
water systems) to your water lines using the following procedure:
1. Reconnect all lines except the hose to the pump inlet port. Close all drain valves, be
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sure all shutoff valves are open.
2. 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.
3. Dilute the antifreeze solution in accordance with the manufacturer's instructions.
4. Open all water faucets.
5. Insert hose length into the antifreeze container, turn the pump switch on, and run
the water pump until the antifreeze solution fills all water lines and is coming out of
all faucets on hot and cold sides. Flush toilet and hand sprayer. Work shower hand
spray while holding down in tub.
6. Shut off the pump and close all faucets.
7. Disconnect the hose length from pump inlet fitting and reconnect water system inlet
line.
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