HOWTO: Water System Winterizing
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© 2016 by Erwin Hymer Group North America, Inc.
Webasto control
Instant hot water filter
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• Locate the Webasto unit control on the cabinet face behind the television. Turn the left knob to the dump position (all the
way counterclockwise). Open the galley sink hot water faucet to allow air into the hot water system. It will take
approximately 10 to 15 minutes for the unit to drain completely. The Webasto unit will reset after 90 minutes to close the
dump valve.
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• Turn on the water pump. Open the galley sink hot water faucet until antifreeze emerges. Do the same for the bathroom
sink.
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• Pour a half gallon of antifreeze down the sink into the gray water tank. This will be used to winterize the waste water
disposal pump.
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• Empty the black water tank by flipping up the front and middle flaps along the bottom of the driver's side, extending and
weighting down the waste water discharge hose, opening the valve at the end of the waste water discharge hose, opening
the black water tank valve by pulling the black handle, pressing the red button on the side of the driver's seat pedestal
until no more water is discharged from the waste water discharge hose, and closing the black water tank valve. Either do
this at a dump station or catch the discharge and dispose of it properly - it may contain debris from the black water tank.
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• Open the gray water tank valve, press the red button again until no more water is discharged from the waste water
discharge hose, close the gray water tank valve, and replace the waste water discharge hose. If you have emptied your
gray and black water tanks before starting the winterization process, you should only get a small amount of water and
antifreeze out of the hose.