HOWTO: Water System Winterizing
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© 2016 by Erwin Hymer Group North America, Inc.
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• Buy three gallons of pink RV/marine antifreeze.
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• Turn off the water heater. The main switch is on the outside, behind the water heater access panel on the driver's side.
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• Take your Zion to a dump site and drain the gray and black water tanks.
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• Turn off the water pump.
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• Look for the drain underneath the driver's door for the fresh water tank drain. Open the valve and allow the tank to drain
until empty.
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• Open the water heater cabinet under the fridge. Open the two drain valves and let them drain.
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• Look for the drain by the rear city water connection. Open the drain valve and let it drain.
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• Close all four drain valves.
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• Open the driver's door, remove the orange plug in the fresh water tank gravity fill, and pour in 2 1/2 of the three gallons of
pink antifreeze, saving a half gallon for the drains. Replace the orange plug.
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• Turn the water pump on.
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• Open the galley sink faucet, both hot and cold sides, until you see undiluted pink antifreeze come out. Do the same with
the bathroom sink. Flush the toilet until you see pink antifreeze coming down into the bowl. Open both outside shower
faucets until you see undiluted antifreeze coming out of them.
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• Turn on the city water valve for about 30 seconds. The water pump should start running.
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• Divide the remaining half gallon of antifreeze between the three drains - shower, bathroom sink, and galley sink - and the
toilet.
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• Open the three water drain valves for a few seconds each and allow a small amount of antifreeze to leak out.
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• Run the macerator until the pink stuff comes out. You may need to add a small amount of antifreeze to the black or gray
tanks.
Do not attempt to bypass the water heater. The three valves in bypass configuration are for maintenance and
factory testing only. The tankless water must be filled with antifreeze and must not be bypassed.
