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Breville BES900 Dual Boiler - Owners thread

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  • Re: Breville BES900 Dual Boiler - Owners thread

    Originally posted by 33212D282927282C2539400 link=1312978609/583#583 date=1318297321
    Thanks Phil, im going to try and drop it back in either this arvo or tomorrow morning.
    Hi Sam, Ive been advised that the OPV has been adjusted & the machine is ready to be collected.

    Cheers, Phil

    Comment


    • Re: Breville BES900 Dual Boiler - Owners thread

      Impressed with this level of service!

      Originally posted by 26282025222C233F3B4B0 link=1312978609/585#585 date=1318375443
      Originally posted by 33212D282927282C2539400 link=1312978609/583#583 date=1318297321
      Thanks Phil, im going to try and drop it back in either this arvo or tomorrow morning.
      Hi Sam, Ive been advised that the OPV has been adjusted & the machine is ready to be collected.

      Cheers, Phil

      Comment


      • Re: Breville BES900 Dual Boiler - Owners thread

        A pretty cool pic of the QC X-ray they do on our steam boilers! Courtesy of Dave Gubbin whos meeting with the factory in China at the moment.........

        Cheers, Phil

        http://www.flickr.com/photos/6312606...in/photostream

        Comment


        • Re: Breville BES900 Dual Boiler - Owners thread

          Originally posted by 6D636B6E6967687470000 link=1312978609/585#585 date=1318375443
          Hi Sam, Ive been advised that the OPV has been adjusted & the machine is ready to be collected.
          Thanks Phil. Odd way to get the news but, hey, its done so im happy!

          Looks like he did a great job with it. The repair card read "Tested at 13 bar, adjusted to 9-10 bar".

          Ive run half a dozen test shots this morning, and the gauge is pretty much bang on "9". The first shot was with the grinder unmodified which was yielding 30-35 second shots using the 2-cup preset. As anticipated it ran quite a bit longer (about 50 seconds) and was a surprisingly tasty shot, and had considerably improved mouthfeel. Whereas a shot previously felt thin in the mouth, not unlike a mouthful of warm-water, it now has some body and silkiness in the mouth.

          I might point out that im a BJCP-certified judge, so im quite familiar with the process of judging beverages.

          Interestingly, watching the gauge now while it is extracting around the 9 mark, the needle vibrates rapidly, which I assume is the mechanical OPV cutting in and cutting out? This never happened before. It would rise to, say, 12-13, and just sit there completely steady. This says to me that the OPV wasnt functioning at all before, but I might be wrong. With a 15-bar pump and 13 at the gauge, is it unreasonable to assume that 2 bar was being "lost" in the system, rather than that the OPV was limiting to 13 bar?

          Comment


          • Re: Breville BES900 Dual Boiler - Owners thread

            Originally posted by 58565E5B5C525D4145350 link=1312978609/587#587 date=1318454971
            A pretty cool pic of the QC X-ray they do on our steam boilers!
            That is cool. Checking for cracks?

            Comment


            • Re: Breville BES900 Dual Boiler - Owners thread

              Originally posted by 7F6D6164656B646069750C0 link=1312978609/588#588 date=1318461773
              Interestingly, watching the gauge now while it is extracting around the 9 mark, the needle vibrates rapidly, which I assume is the mechanical OPV cutting in and cutting out?
              Yep mine does the same..

              Comment


              • Re: Breville BES900 Dual Boiler - Owners thread

                Perhaps its because so many DB owners want to see a reading of 9 bar on the gauge when the opv opens. :-?

                My experience with other machines is that a gauge reading of more like 10.0-10.5 (ish) bar allows for a 9 bar extraction.

                Ill be shooting for that ballpark when I adjust mine on Saturday morning and if its actually a tad high, no problemo

                I agree with Phil that extraction pressure (give or take) is far from the most significant of variables.

                Chris

                Comment


                • Re: Breville BES900 Dual Boiler - Owners thread

                  Originally posted by 34333F3D2531570 link=1312978609/590#590 date=1318487691
                  Originally posted by 7F6D6164656B646069750C0 link=1312978609/588#588 date=1318461773
                  Interestingly, watching the gauge now while it is extracting around the 9 mark, the needle vibrates rapidly, which I assume is the mechanical OPV cutting in and cutting out?
                  Yep mine does the same..
                  Gauge flutter is usually an indication that you are choking the machine.

                  Either grind coarser, dose less, or use a combination of both, still aiming for a runny honey pour.

                  Comment


                  • Re: Breville BES900 Dual Boiler - Owners thread

                    Originally posted by 6E787D7D6C6E626B6B68680D0 link=1312978609/592#592 date=1318493950
                    Gauge flutter is usually an indication that you are choking the machine.
                    What I see now is pretty much exactly what this video shows.

                    Comment


                    • Re: Breville BES900 Dual Boiler - Owners thread

                      Originally posted by 7765696C6D636C68617D040 link=1312978609/593#593 date=1318500006
                      Originally posted by 6E787D7D6C6E626B6B68680D0 link=1312978609/592#592 date=1318493950
                      Gauge flutter is usually an indication that you are choking the machine.
                      What I see now is pretty much exactly what this video shows.
                      Watch closely and you will notice that the flutter is dying out as the coffee extraction commences. Unfortunately the video pans away from the gauge at that moment.

                      What I said is correct.

                      Comment


                      • Re: Breville BES900 Dual Boiler - Owners thread

                        Originally posted by 7E686D6D7C7E727B7B78781D0 link=1312978609/594#594 date=1318503627
                        What I said is correct.
                        But if he was choking the machine, wouldnt the OPV kick in and the needle stay stable? I know that when I choke the machine I dont get flutter...

                        Comment


                        • Re: Breville BES900 Dual Boiler - Owners thread

                          Originally posted by 6760787C6A7D3636360F0 link=1312978609/597#597 date=1318542636
                          Originally posted by 7E686D6D7C7E727B7B78781D0 link=1312978609/594#594 date=1318503627
                          What I said is correct.
                          But if he was choking the machine, wouldnt the OPV kick in and the needle stay stable? I know that when I choke the machine I dont get flutter...
                          The OPV is in line with the pump- which is a vibration pump. At the point of release, I would have thought that any operation of the OPV would (should) mirror the frequency of the pump.

                          In many HX machines, its remote and connected via a good length of silicon hose which can iron out some of the fluctuation. I guess gauge design and the actual location within the system of the gauge capillary tube is possibly significant as well.

                          Might just be me, but I rarely (if ever) look at a gauge during extraction. Im way more interested in the shot. If it wants to vibrate, good luck to it!

                          Comment


                          • Re: Breville BES900 Dual Boiler - Owners thread

                            Originally posted by 35000D0A3E220E07070404610 link=1312978609/598#598 date=1318543200
                            The OPV is in line with the pump- which is a vibration pump. At the point of release, I would have thought that any operation of the OPV would (should) mirror the frequency of the pump.
                            WOuldnt that mean that during normal opertaion you would also see fluctuations? Unless your are suggesting that at the cut in pressure of the OPV the vibratory nature of the pump cause fluctuations. But that would have to be right at that point, and would have to stay there during the brew rather than smooth out (like you are suggesting, but unlike what toasty is experiencing). Perhaps toasty can upload another vid?

                            Comment


                            • Re: Breville BES900 Dual Boiler - Owners thread

                              First, not all opvs are the same. In the case of the Breville if you use a blind filter the gauge will not flutter because there is a steady stream of water escaping from the valve. It flutters if the flow isnt steady. More likely at some point during vibe pump operation or when the resistance at the other end ie. Coffee grinds, are not quite perfect. Perhaps ironic but if coffee grinds are way off you probably wont see any flutter at all. The gauge would be likely to behave differently with a centrifugal pump but thats another story.

                              All this may be of interest and help in understanding function, but wont make a better coffee.

                              CW: Really, I cant thank you enough for expressing your views about what you consider to be my lack of humility and customer service. I disagree with your perspective.

                              Comment


                              • Re: Breville BES900 Dual Boiler - Owners thread

                                Just a short note to say that a month in and still loving the DB. Even more its great to see some useful discussion from knowledgeable people on this forum. I cant think of many other domestic purchases ive made where i can get feedback so easily from the company representatives.

                                Two things ive noticed so far. Using the smart grinder combo with the DB, set to 2 shots with an extra notch of ammount i underdose (based on the 5c test) and with 2 extra notches i overdose (get a shower imprint without extracting) (if ive incorrectly diagnosed the dosing, please let me know). Seems the best result is running 1 shot at 1notch and a second shot at 2 notches (from the grinder). this weighs in to be approx 19g (cheap digital scales, really wish i had some with an extra degree of precision).

                                Second thing is, i really need to be careful with how far i lock in the group handle. When viewed from above, with 12oclock being straight into the machine, i need to turn it to at least 5 oclock (ie just pas the little arrow indicating locked, definitely past the 6 lock point). If i dont i have seen the group handle loosen itself and come out during extraction. I think i had seen someone else with a similar result. Should I be concerned? I dont wish to wear the group seal out prematurely.

                                Small issues I think, given how good the coffee i get out from the machine with little effort. Also, since i came from the Em6900 sunbeam, my milk texture is 1000x better. Nice to know it was not so much me ans the machine holding me back previously.

                                Thanks guys, some really great information in this thread.

                                Jamie

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