Just a guess, but I think the "dry camp" selection is another word for "normal" operation. In the winterize position, the pump will function as a siphon from antifreeze tube. In dry camp position, the pump functions as normal, pulling water from the fresh water tank.
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BILL {aka-"Admiral"-"Deuce"-"W.D."}
2014 Itasca Ellipse 42QD, Freightliner Maxum, 450HP Cummins ISL, 3000 Allison, Roadmaster Nighthawk II, 2011 Lincoln MKX.
2012 Newmar Canyon Star (first coach) FMCA F428511.
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