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Old 11-28-2005, 07:32 PM   #1
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Exeter , Rhode Island
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Water heater bypass not working

I winterized my 89 Excella a few days ago. I turned the handle to bypass on the bypass valve and I still had the first 6 gallons of anti-freeze go into the water heater. I'm not sure if the bypass came on the AS from the factory, but it looks like it may have. It looks like a heavy duty valve. It has one handle to turn for bypass. Can the valve be repaired?
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Old 11-28-2005, 09:17 PM   #2
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Broken Arrow , Oklahoma
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Well I don't know for sure but all the bypass setups I have seen have two valves and I think there is one set up that uses three valves. Not sure how it would bypass with just one vlave unless you have a one-way valve at the output of the water heater.

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Old 11-28-2005, 10:53 PM   #3
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My 1987 29' Sovereign has a similar problem. I noticed it last year but, have been too busy to trace the lines.

Mine bypasses the city water connection from the back of the trailer when I am blowing out the lines. When I use the pump in a jug of anti-freeze, it does not bypass the heater???? I just blow/drain out the heater and then pump some anti-freeze into the heater to keep from freezing.

I have not had time to look at the piping schematic to see what is going on.
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Old 11-29-2005, 05:53 AM   #4
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A thousand words

I too would think three valves are needed.

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Old 11-29-2005, 06:23 AM   #5
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Dewey , Arizona
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Mine has two valves, one at the input to the water heater and one at the exit. When in by pass mode the water is directed by these valves to a line that is connected between the two valves. Here is my simple drawing of the water heater hook up.
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Old 11-29-2005, 09:28 AM   #6
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Rob, my Excella also had the single handle by-pass set-up, and it also failed. Inside the metal box to which the handle and pipes are attached is a system of valves that carry out the function required. My enquiries indicated that spares were not available to renew the parts inside the box. I therefore junked it, and replaced it with the usual "two plastic diverter valves and short hose" system available in a package from RV stores for about $14. I would recommend that course of action to you.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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Old 11-29-2005, 03:30 PM   #7
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Exeter , Rhode Island
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Thanks everyone for your input on this topic. My neighbor has a similar bypass valve, with the single lever, on a later model Nomad trailer. My other trailer had three knobs to turn for bypass mode on the water heater. I wonder what kind of bypass AS uses on the new trailers?
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Old 12-05-2005, 07:33 PM   #8
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Exeter , Rhode Island
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Problem solved

The problem with anti-freeze getting into the water heater was not caused by a defective bypass valve as I first thought. There is a check valve located on the output water line of the water heater near the bypass valve. This valve was defective allowing anti-freeze to back flow into the water heater.
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