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HX machine problems- Brugnetti

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  • tristanp
    replied
    Thanks Artman. My o-ring looked ok so I left it in place and my anti-vac valve is all good after my work with the wet and dry. I guess my point was that if the pump is running often then it could be an indication that water or steam is escaping the boiler. It may then be worth examining the machine to see if this is the case and where.

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  • artman
    replied
    They usually have an o-ring for the seal. It can perish/go hard. You could replace the o-ring (bearing shop) or the entire valve from one of the sponsors. They are not expensive.

    Cheers

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  • tristanp
    replied
    Originally posted by MrJack View Post
    Sounds like you might be describing an anti-vacuum valve?
    Thank you MrJack. Now you say it, that is exactly what it would be.

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  • MrJack
    replied
    Sounds like you might be describing an anti-vacuum valve?

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  • tristanp
    replied
    Originally posted by RobertC View Post
    Hi al
    Also about every 20min the pump start and runs for about 5sec is this just topping up the boiler.
    Rob
    Hi Rob. The pump was recently running fairly regularly to top up the boiler on my machine too - and getting more often. I noticed a noise like steam escaping that used to happen as the machine warmed up was now constant. It turned out that there is a valve in the middle of the boiler top that had some corrosion. When the boiler warms up it pops up and stops steam escaping. However, with the corrosion it wasn't sealing and steam was constantly escaping - causing water to condense in the machine and also causing the pump to start more often.

    Since I dismantled the valve and cleaned off the corrosion with wet and dry the pump no longer starts so often.

    Could be something to check.

    Cheers,
    Tristan

    Leave a comment:


  • burr
    replied
    Ah, a quick google search shows that the settings leaving the factory can be quite high (up to 1.5-1.65 Barr!) which is intentional due to the short HX path, but the manual recommends 1.3-1.5.

    Leave a comment:


  • TOK
    replied
    Originally posted by chokkidog View Post
    Agreed TOK, but I would squeeze it out to 90°C- 93°C so that the mid range is about 92 +/-. My opinion only;....... I've had some great coffee tasting pretty awful at 85°C and start
    to get twitchy at anything sub 90°C. ;-D
    Yes, 92 +/- is my "standard" and I also don't like to see it below 90 (and I use a *PID* BFC Junior Extra machine for cupping so easily managed), however a reasonable fluctuation for an HX machine would be between the figures I mentioned, where in reality you don't really know anyway unless you go to the trouble of using a thermocouple in the accepted way.

    95 degrees burns coffee no matter which country you are in except perhaps where the particular ethnic custom is to use hard / very dense beans such as robustas or some of the indonesians for example, however this is not really for newbies to worry about

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  • RobertC
    replied
    Measured 92°c with the probe up the portafilter spout.

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  • chokkidog
    replied
    Originally posted by RobertC View Post
    Without sounding like a total noob does pressure relate to boiler temperature ? I did a cooling flush and checked the water temp and it levelled out at about 92 Deg I read that 95 deg is the desired brew temp?
    Where and how did you measure 92°C?

    Originally posted by TOK View Post
    Yes boiler pressure does relate to boiler temperature, but there are other things that also relate to brew temperature...

    95 is invariably too high...I dunno where you read that. A fluctuation of say 88 to 92 would be considered to be within spec.
    Agreed TOK, but I would squeeze it out to 90°C- 93°C so that the mid range is about 92 +/-. My opinion only;....... I've had some great coffee tasting pretty awful at 85°C and start
    to get twitchy at anything sub 90°C. ;-D

    Leave a comment:


  • RobertC
    replied
    Tok. I read that from the link that Buur had posted above Here is the extract.

    "In the case of most U.S. espresso lovers, their target brew temperature is around 201-203°F; for some countries overseas, the tastes are for a cooler 192°F."

    Leave a comment:


  • TOK
    replied
    Yes boiler pressure does relate to boiler temperature, but there are other things that also relate to brew temperature...

    95 is invariably too high...I dunno where you read that. A fluctuation of say 88 to 92 would be considered to be within spec.

    Leave a comment:


  • RobertC
    replied
    Without sounding like a total noob does pressure relate to boiler temperature ? I did a cooling flush and checked the water temp and it levelled out at about 92 Deg I read that 95 deg is the desired brew temp?

    Leave a comment:


  • RobertC
    replied
    Backflush is the next thing on my list. My Sunbeam had an automatic backflush cycle so how many times through would I do a backflush and for how long each time?

    Leave a comment:


  • chokkidog
    replied
    It appears that Brugnetti factory settings are way too high.

    Adjust the pressurestat down and try a couple of settings......... 1.0-1.1, 1.1- 1.2, 1.2-1.3

    Leave a comment:


  • burr
    replied
    If you haven't already it might also help to do a chemical backflush. I've found with some old machines when users don't backflush with detergent (i.e. cafetto) the shots suffer. 1.4-1.5 sounds high but this depends on the machine. Perhaps the Brungetti has a short path through the HX and compensates with a higher temp boiler?

    Leave a comment:

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