The General ACS Minima Thread

HVL87 Maybe the machine isn’t level or your tamp is uneven?

Hmm, did not think to check the machine being level but I’m quite particular for checking the tamp is level after using the distributor.

HVL87 What pressure does the gauge show when backflushing

It also shows 10 bar. I did lower it from being over 11 when I got it but as I have a profiling paddle I thought I’d leave it at 10 so I can then play more with profiling when I’ve mastered the basics.

HVL87 Are you brewing to a specific ratio (by weight) and timing your shots?

Yeah I started at 1:2 and been increasing slowly to find the perfect balance of taste. Today was 18g in and just over 42g out in high 30s I believe with first drips at about 10s. I’m struggling to multi-task with the weight and timer haha. My focus has been weight though.

Thanks for your help and will update on findings from the morning drink as 2 a day is my caffeine limit currently lol.

Alexvs Hmm, did not think to check the machine being level but I’m quite particular for checking the tamp is level after using the distributor.

Only a suggestion based on what I have read before around uneven flow from a double spouted PF.

Alexvs I’d leave it at 10 so I can then play more with profiling when I’ve mastered the basics.

Sounds about right then if you are reaching 10bar when pulling a shot? Usually my shots will ramp to a slighter lower pressure than when backflushing, unless the grind is very fine.

Alexvs Yeah I started at 1:2 and been increasing slowly to find the perfect balance of taste. Today was 18g in and just over 42g out in high 30s I believe with first drips at about 10s. I’m struggling to multi-task with the weight and timer haha. My focus has been weight though.

You don’t really need to focus on time when pulling a shot. If you’re aiming for a specific ratio e.g. 1:2, focus on stopping the shot at a final weight of 36g. Once you’ve stopped the shot the time flashes for a second or two so you can take a mental note then. Based on taste and using time a reference adjust finer/coarser or ratio (as you seem to be doing).

Out of curiosity what beans are you using? 18g:42g in high 30s with first drip at 10s does imply you’re grinding quite fine. Could always loosen it a bit.

Also depending on the size of your cappuccino a single shot might get a bit lost taste wise although I understand not wanting to drink a double. Did it work for you on the BE (grind and brew)?

HVL87 I got the spirit level out and it was ever so slightly out but more back to front over left to right.

My shots using the BE grinder would ramp up slowly to 9 but quite soon drop to 8 so I thought it might go to 10 and then drop to 9 but didn’t quite make it.

I’m using some beans from a local roaster called Milk & Beans, they’re a Columbian called El Carmen. I’m thinking I’ll loosen it and try that as I think I’ve just gone too fine. Would 2 clicks courser be too much or just do it 1 at a time do you reckon?

We use a bigger standard tea cup in the morning and then small coffee glass in the afternoon. Yeah on the BE I got to quite a consistent tasting drink. It was probably closer to 1:3 ratio though as I just used the standard double program and used 20g in at high 50’s out. I’ll start with changing the grind and then extend the ratio after that and see where it goes as don’t mind playing around with my 2 drinks a day.

Alexvs I thought it might go to 10 and then drop to 9 but didn’t quite make it.

As the puck erodes the pressure might drop around half a bar from what I’ve observed.

Alexvs I’m using some beans from a local roaster called Milk & Beans, they’re a Columbian called El Carmen.

If the roast is medium/dark I typically go for a mid to high 20’s shot and 1:2 ratio. Of course it depends on your taste preferences and the specific bean.

Alexvs Yeah on the BE I got to quite a consistent tasting drink.

I’m sure you’ll get there!

Alexvs Would 2 clicks courser be too much or just do it 1 at a time do you reckon?

See how you get on with one mark coarser.

HVL87 I decided to go for a double each today to see if there were any issues with my prep using the bottomless PF. I first tried 2 marks courser to start as had 2 drinks to experiment with and seems I hit the jackpot as went up to just over 9 bar and settled just under. No channeling could be seen and had a lovely caramel colour to the pour after PI. Still took about 10s to start coming through and finished just over 30s with 18g in, 44g out. The second shot doing exactly the same messed up as when removing the dosing cup some grounds dropped out so was probably 17g in and ran similar ratio in 25s.

Going to try splitting the afternoon drink as I now know my prep isn’t an issue (obviously this could change but good reference). Will see how that goes but glad I’ve had at least 1 good cappuccino today 😁

dutchy101 It’s not at a point that I think I need to worry, but was wondering if this is normal?

Only if you have overtightened it…these “compression close” knobs as I call them are very, very good if you use them right, most people don’t and instead of ending up lasting 10-15 years they last 3 years. Much longer than the “no compression” type.

I have posted this before for the Elizabeth, but I can’t find it, so I will post in again, as this knowledge has been forgotten over the years. In the olden days people always stood a milk jug under the steam wand. This was not because they would leak, although sometimes they did…but for another reason.

When you close the wand, do it very, very lightly…1 finger will do, until it “just” stops. Shortly after, the water/steam will start to drip out again. This is because things have contracted slightly as it cools, and the valve becomes slightly open. You are then meant to close the valve a little more, very, very lightly, until it just stops….it won’t start leaking again. Do it this way and that Teflon pad seal will last 10-15 years.

Instead, people think ah I didn’t close it enough and close it harder the first time, it might still leak and the cycle repeats, the seat deforms and you need a new valve…or the cup holding the seal splits.

ACS Minima Help!

New minima was delivered and setup. Following boiler filling instructions. After pump ran for 20 seconds, I notice the water wasn’t being pulled from the reservoir. I turn it off and tried again with no effect. Googled and used 1st coffee technique of pushing water into pump with turkey baster. Now the issue occurs, every time the machine powers on, it trips the breaker in the house. Googled everything and cannot figure this out. Machine has been on for total of 3 minutes off and on so don’t have any idea what’s happening. Any ideas ?

GB

Thanks for the reply Dave. The video was even demonstrating this With a minima…. Learned a lesson to come here first.

Anything specific to be looking for inside the case? There was a bit of water under the machine.

Update. Vibe pump started to work after cycling it for 10 second intervals. Now the tripping problem has been diagnosed to a leak somewhere. I know the leak is causing the issue, becusss I can dry out the machine then when I flip the machine on the pump runs for 10 seconds the water begins to run out of the front of the machine. Narrow it down to somewhere around the pump, but don’t want to go farther than taking off the cover. Extremely frustrating. I will email ACS for help as well.

Gtbarringer Have you undertaken this process with the side covers off, watching to see if you can spot the leak as soon as it starts?

Gtbarringer The leak can be from a number of sources….and would indicate different problems…all solvable. It’s also extremely important you take the top off the machine 4 screws and take some good photos.

Here are a list of possible problems, some solved in seconds. I’ll highlight the most likely ones.

• Connector has fallen off autofill probe during transit
• Split tube feeding pump
• loose connection after pump
• expansion valve tube split
• Loose connection on boiler

Thanks for the gents. I took another stab at it this morning and narrowed down the leak to under the vibe pump. Had to take off the Gicar controller to access. Any suggestions now? Can you rebuilt a vibe pump or tight some fittings?

DavecUK