HOWTO: Water System Winterizing
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© 2016 by Erwin Hymer Group North America, Inc.
Webasto bypass Instructions
•
• 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.
Webasto control
Valves at red arrows should be left alone
(always open). Green arrow points to
shunt valve; pink and purple arrows point
to hot and cold supply lines for Webasto
•
• Locate the diesel-fueled hot water unit underneath the vehicle. It is immediately behind the center of the rear axle (the
differential). There are two air ducts on the front side of the unit, near the top. There are also two white water lines coming
back from the front of the Roadtrek, one on each side of the chassis centerline. Just before these lines get to the Webasto
unit, there is a transverse white hose connecting them, with a valve on it. This is the shunt valve. To winterize, you open
the shunt valve, and close the two valves on the hot and cold lines going into the Webasto BETWEEN THE SHUNT
(TRANSVERSE) LINE AND THE UNIT. There may be other valves on the hot and cold lines forward of the transverse white
hose connecting the two water lines - DO NOT TURN THESE VALVES. (see photos above and below). If your outside shower
quits working, you turned the wrong valves.
