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VBM domobar super rotary brew pressure gauge anomalies

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  • VBM domobar super rotary brew pressure gauge anomalies

    Hi


    This rotary is connected directly to the water mains, so when the machine is switched off and I open the tap I get a reading on the PG of between 3 and 4 bar, the water mains pressure.

    When I switch the pump on, the (pressure gauge)PG reads 8 bar with blind filter attached or no filter at all, I always get 8bar no matter what.

    All this is with switch in position 1, when I switch the boiler on and it slowly starts reaching the 1.1 boiler pressure the pressure gauge needle climbs and stays constant at 12bar, I activate the pump with no porta filter and the PGs needle swings rapidly to 8bar.

    As stated I have turned the OPV screw clockwise with no effect.

    And Ive turned it counter clockwise-what I got when I CC turned the OPV screw is quite interesting

    From the factory setting I turned the OPV screw out by about 1.5 turns

    I still get 8bar on the PG with no porta filtro, with the boiler off, when the boiler is at 1.1 bar the brew pressure gauge is constant at 7bar, no more 12bar BPG readings, when I activate the pump I got a sound comming from the machine that sounded like a rusty hinge on a gate while opeing it. So I turned the OPV a half turn clockwise, I got the rusty gate sound momentarily then it went away.

    1) What is the rusty gate sound when Ive turned the OPV counter clockwise, and why does the BPG stay at 7bar when the machine is idle and the boiler is correctly operating with peak pressure of 1.1bar

    2) Why does the BPG read 12bar when I dial the OPV screw clockwise.

    3) Why does the Brew Pressure Gauge always read 8bar no matter what I do

  • #2
    Re: VBM domobar super rotary brew pressure gauge anomalies

    by rusty gate do you mean SQUUUEEEEEELLLLLL ? lol

    that might be the OPV working and "jittering" at high frequency while it lets water out it then may have settled itself

    "2) Why does the BPG read 12bar when I dial the OPV screw clockwise."

    do you mean 12 brew pressure or boiler pressure ?
    if brew, have you "closed the opv" ? by screwing it "in"
    i

    Comment


    • #3
      Re: VBM domobar super rotary brew pressure gauge anomalies

      Originally posted by 6567717678676B76020 link=1288504417/0#0 date=1288504417
      Hi

      This rotary is connected directly to the water mains, so when the machine is switched off and I open the tap I get a reading on the PG of between 3 and 4 bar, the water mains pressure.
      Hmm...you should have a 350kPa pressure limiting valve and appropriate scale reduction filtration installed... :-?

      When I switch the pump on, the (pressure gauge)PG reads 8 bar with blind filter attached or no filter at all, I always get 8bar no matter what.

      All this is with switch in position 1, when I switch the boiler on and it slowly starts reaching the 1.1 boiler pressure the pressure gauge needle climbs and stays constant at 12bar, I activate the pump with no porta filter and the PGs needle swings rapidly to 8bar.

      As stated I have turned the OPV screw clockwise with no effect.
      Sounds normal enough. A little confusing here. I presume you mean that boiler pressure is climbing to 1.2 bar? If so, also normal.

      The fact you are not seeing a change in system pressure could point to issues with the bypass on the pump or with the gauge. Perhaps it simply sticks at 8 bar? You need to get a p/f gauge onto the group to help problem solve.

      And Ive turned it counter clockwise-what I got when I CC turned the OPV screw is quite interesting

      From the factory setting I turned the OPV screw out by about 1.5 turns

      I still get 8bar on the PG with no porta filtro, with the boiler off, when the boiler is at 1.1 bar the brew pressure gauge is constant at 7bar, no more 12bar BPG readings, when I activate the pump I got a sound comming from the machine that sounded like a rusty hinge on a  gate while opeing it. So I turned the OPV a half turn clockwise, I got the rusty gate sound momentarily then it went away.

      1) What is the rusty gate sound when Ive turned the OPV counter clockwise, and why does the BPG stay at 7bar when the machine is idle and the boiler is correctly operating with peak pressure of 1.1bar
      That was your pump running dry as all the water was routed through the bypass. This would damage and then ultimately kill the pump.

      2) Why does the BPG read 12bar when I dial the OPV screw clockwise.

      3) Why does the Brew Pressure Gauge always read 8bar no matter what I do
      Confusing. You need to clarify whether you mean boiler pressure gauge or system pressure gauge. If you are implying brew pressure gauge, its better to call it system pressure and it will never match what you actually verify at the group using a p/f gauge. Sounds to me like it maty be worth getting a tech. with appropriate gear to test this machine to verify what its actually doing.

      Good luck

      2mcm

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