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Old 03-19-2011, 08:24 AM   #16
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Cross connection problem?


This is a good one, keep me in the loop. Thinking, thinking, Thinking.

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Old 03-19-2011, 08:38 AM   #17
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Cross connection problem?


Just thought of something new. Turn off the faucet suspected of cross feeding. Feel the outside of the cold and hot pipes going into that faucet. Have someone turn on another faucet, elsewhere. If the temperature of the pipe changes rapidly then you have a cross connection in that faucet.
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Old 03-19-2011, 08:41 AM   #18
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Cross connection problem?


Just thought of something new. Turn off the faucet suspected of cross feeding. Feel the outside of the cold and hot pipes going into that faucet. Have someone turn on another faucet, elsewhere. If the temperature of the pipe changes rapidly then you have a cross connection in that faucet. (Do not confuse this with the equalizing of temperature when the faucet sits for awhile with no one using water there or elsewhere.)
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Old 03-19-2011, 12:16 PM   #19
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Cross connection problem?


Quote:
Originally Posted by AllanJ View Post
Just thought of something new. Turn off the faucet suspected of cross feeding. Feel the outside of the cold and hot pipes going into that faucet. Have someone turn on another faucet, elsewhere. If the temperature of the pipe changes rapidly then you have a cross connection in that faucet. (Do not confuse this with the equalizing of temperature when the faucet sits for awhile with no one using water there or elsewhere.)
"Go git em Allen"
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Old 03-22-2011, 01:34 PM   #20
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Cross connection problem?


Gents,

I had another plumber come and look at the problem today and here is his theory. First, based on the symptoms, he does not think it is a problem with the water heater.

He thinks the problem might exist because of the check valve by the water heater being in the wrong location. Here is a photo of our piping above the water heater:

http://www.flickr.com/photos/21503963@N04/5550135707/

So, what we have is the hot line on the left and the cold line on the right. He thinks the 1/2 inch line coming in all the way from the left is a hot water return line.

Now, what you can't really see here is, behind the flue we have a check valve with the arrow pointing right ->. He thinks this valve is in the wrong place. Right now when water comes in it is going both ways (into the heater and back up) instead of going directly back into the tank. He wants to move the valve to an area on the cold pipe closer to the heater, thus eliminating that problem. He isn't 100% certain that this is causing the issue, but certainly thinks it is a possibility.

Thoughts fellas?
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Old 03-31-2011, 09:18 AM   #21
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Cross connection problem?


Just wanted to update you all since the problem is now fixed We replaced the check valve and ball valve on the 1/2" line, so I am not able to shut off the 1/2" altogether. Since I did that, all of the other symptoms have been resolved.

Any ideas why?

Also, of course, I have now noticed that it takes a bit longer for our water to heat up when running the hot faucet. Not a huge problem (and one that is far more preferable to the other!).

Thanks for all the advice along the way. I have learned a lot and will be keeping a keen eye on the forums!

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