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New Machine: BFC Classica Help

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  • #16
    Re: New Machine: BFC Classica Help

    If the gauge isnt faulty, that would mean either

    a) there isnt a water pressure limiting valve fitted to the water delivery line....(there should be, as there should also be some kind of water conditioning filter) OR.....

    b) there may be a water pressure limiting valve fitted but it isnt a model that regulates the line pressure down as far as is usually used.....(normally a 350 kPa, or sometimes a 500 kPa).

    EDIT:
    c) OR, it has a correct type limiting valve fitted but its faulty.


    On that gauge, the red area is the right area to be in during use (pump running making coffee), and it should park back to somewhere around 3.5 to 5.0 bars when the pump isnt running (if fitted with a 350 or 500 kPa limiting valve).

    Suggest the place to start is to look at the fitment of the machines flexible water inlet pipe to your mains water stop cock (tap), and see if there is a valve fitted between the tap and the flexible water line. If so read the number / code on it to ascertain whether it is the "correct" type.

    Only after youve done that, can it be ascertained what course of action might be taken next.

    There is no manual available to the public but there is an operator booklet supplied with each new machine. It doesnt tell you anything much and usually disappears shortly after install. About the best you could get from it would be how to programme the touch pads. Wont tell you anything about maintenance or service as that is not for the operator but an authorised service technician to sort and rectify as necessary.

    Hope that helps.

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    • #17
      Re: New Machine: BFC Classica Help

      I dont think 7 bar on the pump gauge is indicating any problem. This is the residual pressure in the heat exchangers, and it will rise naturally as the machine heats (water expanding), then drop back to the pump pressure (9 ish bar) when the groups are running. The machine will have a one-way valve probably before the pump which prevents water flowing back into the mains, so what you are seeing is the sum total of pressure from mains + residual pressure that the pump built up -the group solenoids and pump switch on and off together. The only way to see JUST mains pressure on the gauge would be to electrically disconnect the pump then run one of the groups, but theres really no need.

      Therell also be an expansion valve somewhere that will be set to about 11-12 bar, to keep things within the working limits of the HX plumbing. If the gauge goes beyond say 12, the expansion valve is not doing its job.

      Having said that, you should definitely look into the mains pressure and add suitable pressure limiting valve/filtration to prolong the life of the machine.

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      • #18
        Re: New Machine: BFC Classica Help

        I think Ive got everything sorted now. So for reference, our CTU was knackered. It was regulating pressure as well as filtering the water before it broke so too much pressure was coming into the machine. A new CTU with variable pressure regulation has sorted that out nicely. Full service didnt do any damage either.

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