Thread Tools Search this Thread Display Modes
Old 11-28-2005, 06:32 PM   #1
2 Rivet Member
Exeter , Rhode Island
Join Date: Jun 2004
Posts: 82
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?

Rob30044 is offline   Reply With Quote
Old 11-28-2005, 08:17 PM   #2
Rivet Master
garry's Avatar
1969 31' Sovereign
Broken Arrow , Oklahoma
Join Date: Jan 2003
Posts: 1,331
Images: 7
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.


garry is offline   Reply With Quote
Old 11-28-2005, 09:53 PM   #3
Rivet Master
1987 29' Sovereign
Sparta , Tennessee
Join Date: Mar 2003
Posts: 507
Send a message via Yahoo to wingfoot321

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.
wingfoot321 is offline   Reply With Quote
Old 11-29-2005, 04:53 AM   #4
Rivet Master
TomW's Avatar
1967 26' Overlander
Huntsville , Alabama
Join Date: Dec 2003
Posts: 2,893
Images: 2
A thousand words

I too would think three valves are needed.

Attached Thumbnails
Click image for larger version

Name:	BypassMR.jpg
Views:	105
Size:	38.2 KB
ID:	16725  
1967 Airstream Overlander International
TomW is offline   Reply With Quote
Old 11-29-2005, 05:23 AM   #5
Site Team
azflycaster's Avatar
1975 25' Tradewind
Dewey , Arizona
Join Date: Mar 2005
Posts: 12,037
Images: 62
Blog Entries: 1
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.
Attached Images


WBCCI President 2016-2017
azflycaster is offline   Reply With Quote
Old 11-29-2005, 08:28 AM   #6
Rivet Master
Join Date: Dec 2002
Posts: 1,310
Images: 4
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."
nickcrowhurst is offline   Reply With Quote
Old 11-29-2005, 02:30 PM   #7
2 Rivet Member
Exeter , Rhode Island
Join Date: Jun 2004
Posts: 82
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?
Rob30044 is offline   Reply With Quote
Old 12-05-2005, 06:33 PM   #8
2 Rivet Member
Exeter , Rhode Island
Join Date: Jun 2004
Posts: 82
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.

Rob30044 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Heater Craig 1978- 1979 Excella 500 7 10-01-2007 05:16 PM
Repair or Replace Original Bowen Water Heater? Andy R Water Heaters, Filters & Pumps 8 11-16-2005 03:51 PM
water heater bypass tomb 1987 Sovereign 1 11-22-2002 01:04 PM
wiring - water heater Craig Electrical - Systems, Generators, Batteries & Solar 12 10-02-2002 05:03 AM
Water heater bypass niftypkg Water Heaters, Filters & Pumps 0 05-15-2002 05:38 PM

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:32 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.