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  • Carimali Uno e water backflow problem

    First post, I did search
    I am restoring this uno and was testing it last night by drawing water from a jug, (rotary pump).
    It heat up fine, drew shots as it should, nice steam...but then I noticed the pump was kicking in a lot more than it should. No leaks, then I noticed the water would drain back into the jug,, pump would kick in to fill the boiler again, the water would then drain back to the jug and the process would start over.
    It is obviously bleeding back through the pump, but is there a one way valve in the intake fitting?
    My deductive skills say either the pump should not allow backflow or the intake valve should not allow backflow.

    Any help will be appreciated.
    Thanks
    bob
    Last edited by bobs; 3 June 2018, 03:31 AM.

  • #2
    You need to install a one way valve in the line running from the jug to the machine.


    Java "One way to go" phile
    Toys! I must have new toys!!!

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    • #3
      I thought of that, wondered if it would be that easy.
      I have used a jug on other rotary pump machines and never had that problem...home Depot here I come.thanks

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      • #4
        A .... water diode? :P

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        • #5
          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

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          • #6
            Asked and answered 2 years ago: https://coffeesnobs.com.au/brewing-e...w-problem.html


            Java "Closed" phile
            Toys! I must have new toys!!!

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            • #7
              With additional information from original poster thread re-opened and merged with the original thread.


              Java "" phile
              Toys! I must have new toys!!!

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              • #8
                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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                • #9
                  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.

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                  • #10
                    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.....

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                    • #11
                      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.

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                      • #12
                        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
                        Toys! I must have new toys!!!

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                        • #13
                          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.

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                          • #14
                            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?

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                            • #15
                              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.

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