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Carimali Uno e water backflow problem

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  • noidle22
    replied
    Originally posted by bobs View Post
    Turns out the inner boiler has a hole in it. Water was flowing from there into the main boiler and out the pressure relief valve.

    Can the tank be cut in half, welded and put back together?
    Sorry for not replying earlier, I forgot. That certainly is an unlucky situation, it isn't very common for the heat exchangers to get holes in them on any machine so I didn't really consider it at the time.

    A boilermaker may be able to open it up along one of the end seams and repair it. They would then pressure test it to make sure it's safe afterwards.
    I'm not really sure on the legality of doing that for domestic equipment so it'd be best to discuss it with them first. It may also end up more expensive to do a repair than to just get another boiler.

    Sourcing a replacement boiler would then be the next issue, can't help you in that regard, especially as you are in Canada.

    Leave a comment:


  • bobs
    replied
    Turns out the inner boiler has a hole in it. Water was flowing from there into the main boiler and out the pressure relief valve.

    Can the tank be cut in half, welded and put back together?

    Does anyone have an UNO e boiler they would like to sell?

    Thanks for the help, i was really hoping i could get it working. ..

    Leave a comment:


  • bobs
    replied
    I found this:
    I will try cleaning the level probe and report back.


    #13: Post by FinSimon » September 15th, 2017, 12:30 am
    Hi!

    Now the Carimali is cleaned and put together again. I plugged it in an filled the boiler, but autofill didn't stop so it overfilled! I was angry for i while and started to investigate the cause for the overfill. I took out the level probe, sanded it and then sanded the ground wires. They where in a bad shape! Now autofill works.
    I then did som tests on the autofill solenoid on the water lnlet box. With autofill ON I got 230V at the coil. With autofill OFF i could read about 26V att the coil! I was hoping for 0V. Is that a problem? Is i enough to open the plugger inside the solenoid?

    /Simon

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  • bobs
    replied
    Originally posted by noidle22 View Post
    That's normal. When the water heats in the now closed system, it expands and has to go somewhere. The valve relieves this expanded water, hence the common name for it: expansion valve.

    As long as water is not flowing from this valve when the pump is running when filling the boiler or when you're extracting then it's good to go. If water is flowing from it when the pump is on, the pump pressure is either too high or the expansion valve bypass pressure is set too low, or it's faulty.
    I have tried 2 different expansion valves, same results.
    water flows when the pump is running, there is a lot of water coming out of the valve. Is there a way to adjust the pump pressure?

    ICBW, but I always thought the boiler only filled part way and steam filled the rest of the boiler.
    I thought maybe the level sensor (if there is such a thing) wasn't working.??

    Leave a comment:


  • noidle22
    replied
    Originally posted by bobs View Post
    Backflow preventer worked! yay!
    new problem though

    as the boiler heats up, water comes out the safety pressure relief valve.

    Is the boiler filling with too much water?
    That's normal. When the water heats in the now closed system, it expands and has to go somewhere. The valve relieves this expanded water, hence the common name for it: expansion valve.

    As long as water is not flowing from this valve when the pump is running when filling the boiler or when you're extracting then it's good to go. If water is flowing from it when the pump is on, the pump pressure is either too high or the expansion valve bypass pressure is set too low, or it's faulty.

    Leave a comment:


  • bobs
    replied
    Backflow preventer worked! yay!
    new problem though

    as the boiler heats up, water comes out the safety pressure relief valve.

    Is the boiler filling with too much water?

    Leave a comment:


  • bobs
    replied
    i ordered a different one way off amazon, looks the same. Need to find some reducers to make it fit. will do that this weekend.
    GFI outlet trips when I turn the switch to turn on the element. Need to get a continuity tester to see if the element needs replacing.

    thanks for you help and patience.

    Leave a comment:


  • Javaphile
    replied
    It's rare for discussion threads to be closed on here. Typically they're not even closed when another user asks the same question in a new thread at a later date. In those cases the new post/thread is merged with the older/original thread. This was a special case where the same user revisited the topic by starting a new thread rather than continuing in the original one.

    Rather than simply deleting the new post/thread it was closed with a link pointing to the original discussion. This gave the poster the answer it contained in case they had forgotten about the thread/answer. Additionally it afforded them the opportunity to expand on their post if they felt it was appropriate. Which they did and which you see the results of.


    Java "As usual thread still open!" phile

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  • noidle22
    replied
    Originally posted by bobs View Post
    this topic can be closed and i promise not to ask the same question again in 2 years.....
    Best to leave it open. If you can update the thread when you have installed the part and advised how the installation went, if it worked, any problems you encountered etc.

    That way if someone is searching for this issue in the future they will have an answer. I've lost count of how many times I've searched the internet for a specific problem, finally find a forum thread where someone was having my exact problem, read through it thinking "yes, finally" only to get to the end of the thread and they never posted their resolution.

    Leave a comment:


  • bobs
    replied
    that makes sense. Thanks for the help. I am in Canada and have to order out of the usa but should have it in a couple of weeks.

    Javaphile; thanks for re-posting, my mind is at ease.
    this topic can be closed and i promise not to ask the same question again in 2 years.....

    Leave a comment:


  • noidle22
    replied
    Originally posted by bobs View Post
    Thank you
    I did try the one way valve but I do not like that the water line between the one way valve and the pump/machine is boiler temp hot all the time.

    I am really searching for a solution that will identify the problem within the machine. I am pretty sure it did not come from the factory this way.
    I checked the service manual and there is no non-return valve provisioned for the Uno E. There is a valve body which integrates the boiler fill solenoid and expansion valve but no non-return.

    Some machines which were only designed to be ran on mains pressure never had a non-return valve fitted as it was unnecessary.

    You can install a non return valve at the outlet of the pump instead of at the inlet. This will stop the hot water from getting to the pump and inlet pipe. You need to make sure it can handle the pressure and temperature, the ones I use are from RS Components and are part number 486-170. They will handle 12 bar and 100C.

    Leave a comment:


  • bobs
    replied
    Thank you
    I did try the one way valve but I do not like that the water line between the one way valve and the pump/machine is boiler temp hot all the time.

    I am really searching for a solution that will identify the problem within the machine. I am pretty sure it did not come from the factory this way.

    Thanks again for re-opening my topic.
    bob

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  • Javaphile
    replied
    With additional information from original poster thread re-opened and merged with the original thread.


    Java "" phile

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  • Javaphile
    replied
    Asked and answered 2 years ago: https://coffeesnobs.com.au/brewing-e...w-problem.html


    Java "Closed" phile

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  • bobs
    replied
    Problem with Carimali Uno rebuild

    Hi,

    am putting an Uno back together and testing it with the intake water line drawing from a jug of water. The rotary pump draws water from the jug just fine.

    The problem is that as the water heats up, the hot water from the boiler back-flows into the jug.

    Looking for help understanding why that is and what can i do about it.

    thanks
    bob

    Leave a comment:

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