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HX machine problems- Brugnetti
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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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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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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.Originally posted by RobertC View PostHi al
Also about every 20min the pump start and runs for about 5sec is this just topping up the boiler.
Rob
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
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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.
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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.Originally posted by chokkidog View PostAgreed 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
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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Where and how did you measure 92°C?Originally posted by RobertC View PostWithout 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?
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 startOriginally posted by TOK View PostYes 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.
to get twitchy at anything sub 90°C. ;-D
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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."
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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.
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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?
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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?
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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
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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?
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