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Old 05-07-2012, 10:18 AM   #1
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Hot water problem

I just finished replacing the new water heater and changed some of the old cooper pipes with new plastic ones in my 1970 Safari. when connected to the water city line everything works great but when working with the pump and water tank the water "jumps" between hot and cold water!
Maybe i misconnected a line?
Thanx
Luis.
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Old 05-07-2012, 10:21 AM   #2
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Could you explain "jumps"? Are the hot and cold reversed when running off the pump?
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Old 05-07-2012, 12:28 PM   #3
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The water runs smoothly but it keeps switching from cold to hot as if the water pump pumped cold water and then hot water and so on.
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Old 05-07-2012, 12:33 PM   #4
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Do you have a hot water heater bypass valve(s). If you do, make sure the "center one" os closed and the input and outlet ones are open.
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Old 05-07-2012, 12:43 PM   #5
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No, I donīt have a bypass valve
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Old 05-07-2012, 01:00 PM   #6
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Hot water problem

Greetings Lfemat!

Quote:
Originally Posted by Lfemat View Post
No, I donīt have a bypass valve
The only thing that occurs to me is a possible explanation for what is happening if you are not totally disconnected from your city water source. If your city water hose is still connected, and particularly if the city water suppy faucet isn't completely shut off . . . you may be getting alternating city water from the hose (I would assume quite warm to hot if you are currently in Mexico City and the hose sitting out in the sun) . . . with water from your coach's tank which would likely be considerably cooler . . . this could also point to a problem with the pump as it shouldn't be operable when connected to city water.

Good luck with solving your problem!

Kevin
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Old 05-07-2012, 01:40 PM   #7
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No, I donīt have a bypass valve
That seems weird; I though most Airstreams had one, to separate the water heater from the rest of the water system for winterizing, so you can fill the rest of the system with antifreeze while leaving the water heater dry. Still, you should know your own system, if if you say you don't…

Next question… Do you have a mixing valve? I mean one right at the outlet side of the water heater. At least for the Atwood water heaters that Airstream uses in some of its models, it stretches a 6-gallon hot water capacity to 9 gallons by means of a mixing valve that mixes hot/cold at a 2/1 ratio, and makes up for it by heating the water to a higher temperature. All this even before the water gets to any faucet. Then, at the faucet, you can mix in additional cold water to fine-tune the temperature to your liking.

It seems like a problem with the mixing valve could explain the results you're getting.
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Old 05-07-2012, 03:41 PM   #8
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That seems weird; I though most Airstreams had one, to separate the water heater from the rest of the water system for winterizing, so you can fill the rest of the system with antifreeze while leaving the water heater dry. Still, you should know your own system, if if you say you don't…
Since I live on Mexico and the temperature rarely drops below freezing I removed the bypass valve, maybe the problem is as you said in the mixing but the strange thing is that when working with the city line the temperature flow is constant!
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