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Thread: VBM Domobar Jnr steam pressure problem

  1. #1
    Senior Member bennett's Avatar
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    VBM Domobar Jnr steam pressure problem

    As documented in another thread I recently had a problem with my pressurestat and it was changed to a newer type - Jaeger.

    My machine now sits at a lower (probably more correct) pressure level, at rest between 0.9-1.2 bar.

    I have no problems with the espresso. However I am having a lot of difficulty stretching milk. Previously with the Mater pressurestat, my machine would sit between 1.1-1.5 bar and would steam like a V8, never dropping below 1.0 bar during steaming a 300ml jug.

    Now as soon as I open the steam tap it drops down to 0.7 bar and then sometimes to 0.5 and then tries to recover slowly. I can stretch milk but it ends up quite thin. I havent even tried a 600ml jug!

    My question is, do I just have to re-learn how to use it with the new levels in terms of judging when the heating element cycles on and off etc or could it be another problem within the steam wand? I dont want to fiddle with the pressurestat as I believe it to be set correctly, but maybe thats what I have to do??? Any suggestions...

  2. #2
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    Re: VBM Domobar Jnr steam pressure problem

    Turn up the pressurestat. Pressure is too low if its going below 1.0

  3. #3
    casso
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    Re: VBM Domobar Jnr steam pressure problem

    This is exactly the issue I have, although Ive never known any different so thought this was normal.

    bennett, did you turn up the pressure stat in the end? did it make a difference?

  4. #4
    Senior Member bennett's Avatar
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    Re: VBM Domobar Jnr steam pressure problem

    Yes I did. After the service it would sit between 0.9-1.1 - never hitting 1.2bar. I fiddled with it a smidge. The pressurestat was initially approx pointing at about 1 oclock now I have turned it so it sits at about 2 oclock. My machine now cycles between 1.0-1.2bar. This has made a huge difference to my steaming ability without compromising the espresso. After a shot, when I open the steam tap it does still drop down to about 0.7 but it recovers quickly. I cant turn it any higher as the machine would then run too hot and affect the espresso temp and have to run cooling flushes etc. So I think I have it spot on now.

  5. #5
    casso
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    Re: VBM Domobar Jnr steam pressure problem

    Cool thanks, Ill give it a try as well. Steaming is really my only issue with an otherwise fantastic machine.

  6. #6
    Senior Member Philby1981's Avatar
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    Re: VBM Domobar Jnr steam pressure problem

    Hey there,
    How did you turn it up? I read the manual and it says to use a Pressuresta adjustment knob but I dont think one come with the machine?
    Cheers
    Phill

  7. #7
    TC
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    Re: VBM Domobar Jnr steam pressure problem

    Im watching you Philby* 8-)

    Your machine is the most current of the Domobar Juniors and has the same commercial Sirai pressurestat fitted to the VBM Domobar Super. Its a nice little complimentary upgrade which has replaced the Jaeger pressurestat -which replaced some flaky Maters...

    If you have any concerns, please discuss any issues with your supplier (Dennis) before you start fiddling.

    Hope youre enjoying it... ;)

    Chris

  8. #8
    Senior Member Philby1981's Avatar
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    Re: VBM Domobar Jnr steam pressure problem

    Ha ha, dont worry Chris, no fiddling going on here ;D I have noticed a bit what they mean but getting used to starting the steam just before the boiler cycle shuts off like the book says. Was a bit curious as the manual made it sound easy and a common practice to adjust. I wont be changing anything without calling Dennis.
    I am loving it, myvnew baby, if I see the slightest smudge or mark on her its out with the rag and a bit of windex. Great combo. Getting my 30 sec pour every time

  9. #9
    Senior Member bennett's Avatar
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    Re: VBM Domobar Jnr steam pressure problem

    Quote Originally Posted by 685D5057637F535A5A59593C0 link=1313108109/6#6 date=1326361538
    Your machine is the most current of the Domobar Juniors and has the same commercial Sirai pressurestat fitted to the VBM Domobar Super. Its a nice little complimentary upgrade which has replaced the Jaeger pressurestat -which replaced some flaky Maters...
    WOW! I cant believe they now come with a Sirai.

    When my Mater carked it, ECA were kind enough to replace it with a Jaeger. At the time they - ECA - thought the Sirais wouldnt actually fit into the small footprint of the Junior (ie would stick out too high and not allow the cup warming tray to fit).

    How did they make it fit??? :o

    Philby, as Chris says you are lucky. The Sirais are found on some of the higher specced HX machines and commercial machines.

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    Hey there...

    I know this is a slightly dated thread, but maybe someone out there in "the know" might come across my post.

    I have had a Domobar Jnr now for about 6 months and it has performed flawlessly in this time. We haven't managed the steamer pressures that some other CS posters have cited but its been workable. On the other hand, our espresso shots have been primo. That is until now!

    Now the gauge (right hand gauge) is barely getting above 4 bar and the shots are pouring way too slowly as you would imagine at this pressure. Our manual, similar to Philby1981's I'm guessing, suggests that I can adjust the pressure by turning the adjustment knob in under the boiler lid. Ours has a small yellow disc with a "+" and "-" either side of it. The disc however, does not seem to be moveable.

    Does anyone have any useful advice that might help me out? Or is there a reliable serviceman in Melbourne who won't replace parts just for the sake of it? Any comments or feedback greatly appreciated.

    Thanks

    Chris

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    If your Jnr is the same as my new Super (and it sounds very much the same setup) the yellow plug you describe is just that - a plastic plug that covers the hole through which you adjust the pressurestat -it just flicks out with a fingernail under it.

    However, adjusting the pressurestat won't affect the issue you are seeing, which is a low pressure indication of the brew gauge - if I understand correctly, this gauge has only recently started reading low, in which case something has happened such as a problem with the pump, or a faulty OPV.

    The pressurestat controls the boiler pressure (and thus, indirectly, the temperature), which is indicated by the lefthand gauge, which should hover around the 1.0 bar mark (or slightly higher) when the machine is idling.

    Unfortunately I can't help you with a service centre in Melbourne, but you might want to pull the cover off the machine and have a look at the OPV if you're at all handy with tools - from what I've read the valve is easily dis-assembled and there might just be some dirt stuck in it.

  12. #12
    TC
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    Quote Originally Posted by spanno View Post
    Hey there...

    I know this is a slightly dated thread, but maybe someone out there in "the know" might come across my post.

    I have had a Domobar Jnr now for about 6 months and it has performed flawlessly in this time. We haven't managed the steamer pressures that some other CS posters have cited but its been workable. On the other hand, our espresso shots have been primo. That is until now!

    Now the gauge (right hand gauge) is barely getting above 4 bar and the shots are pouring way too slowly as you would imagine at this pressure. Our manual, similar to Philby1981's I'm guessing, suggests that I can adjust the pressure by turning the adjustment knob in under the boiler lid. Ours has a small yellow disc with a "+" and "-" either side of it. The disc however, does not seem to be moveable.

    Does anyone have any useful advice that might help me out? Or is there a reliable serviceman in Melbourne who won't replace parts just for the sake of it? Any comments or feedback greatly appreciated.

    Thanks

    Chris
    Hi Spanno and welcome,

    If your machine is new, it should be returned to your supplier for a check as it may well be a warranty issue.

    If not, we have one of the most highly talented techs in Melbourne who is thorough but does not over service. We're happy to assist.

    Chris

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    Bringing up a bit of an old thread here.

    Recently got a Domobar Jnr and struggling for silky smooth microfoam.

    When I froth the milk, towards the end, it makes a screeching sound. I don't think it's because the wand is too deep, because it's only just below the surface.

    My steam pressures generally sits at 1.1 - 1.2, but I noticed that when steaming milk, it loses power towards the end and drops to 0.5 - 0.6.

    Would I be correct in thinking this isn't normal and this is the reason behind the screeching noise?

  14. #14
    Junior Member tampinator's Avatar
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    Quote Originally Posted by Jaya View Post
    Bringing up a bit of an old thread here.

    Recently got a Domobar Jnr and struggling for silky smooth microfoam.

    When I froth the milk, towards the end, it makes a screeching sound. I don't think it's because the wand is too deep, because it's only just below the surface.

    My steam pressures generally sits at 1.1 - 1.2, but I noticed that when steaming milk, it loses power towards the end and drops to 0.5 - 0.6.

    Would I be correct in thinking this isn't normal and this is the reason behind the screeching noise?
    Hi Jaya, I'm having a similar issue recently and wondering if you managed to solve your issue?

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    Hi tampinator,

    I never got to the bottom of it, and still struggle to get the level of microfoam that I want (and used to get with my old Breville dual boiler).

    think this might be entirely down to technique though, as when I block one steam hole with a toothpick, I get the microfoam I'm looking for. This tells me that the drop in steam pressure is not an issue, as it takes longer to steam with the method I'm using at the moment.

    I may look to switch steam tips and see if that helps

  16. #16
    Junior Member tampinator's Avatar
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    Quote Originally Posted by Jaya View Post
    Hi tampinator,

    I never got to the bottom of it, and still struggle to get the level of microfoam that I want (and used to get with my old Breville dual boiler).

    think this might be entirely down to technique though, as when I block one steam hole with a toothpick, I get the microfoam I'm looking for. This tells me that the drop in steam pressure is not an issue, as it takes longer to steam with the method I'm using at the moment.

    I may look to switch steam tips and see if that helps
    Technique definitely had a lot to do with it, in my case anyways. Done a bit of research since my last post and I've noticed adjusting the technique has resulted in really good microfoam.
    I keep the jug straight as possible, rest the wand on the back of the jug (up against the spout) on a bit of an angle with the tip right on the surface of the milk. Turn the steam on and keep it steady, I don't get the swirl affect but more of a tumbling affect from the milk.. seems to be the only way to get consistent microfoam in my case...

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