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Thread: anti vac on ecm giotto

  1. #1
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    anti vac on ecm giotto

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I noticed i am getting false readings on my ecm giotto pressure gauge today.
    the machine heats up and it show 1 bar as per normal.
    But then slowly creeps up to 1.5 bar and just sits there with no further movement.

    I tried adjusting the pressure stat up and down and no movement.

    I tapped on the gauge and no movement

    I then drained the boiler by opening the hot water and letting it all out and yep, the gauge stayed at 1.5bar.

    So would it be the gauge or the anti vac that would need replacing?

    Thanks

  2. #2
    Senior Member Dennis's Avatar
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    Re: anti vac on ecm giotto

    How long has it been since the machine was descaled John?

    The diameter of the tubing to the gauge is quite small and if blocked with scale, will result in what you describe.

  3. #3
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    Re: anti vac on ecm giotto

    Look like is your gauge. If the gauge is not moving probably the pipe of the gauge is block with calcium.

    The anti vacum is to realize the residual air from the boiler

    Regards

    Renzo
    Di Bartoli Home Barista Centre

  4. #4
    Senior Member artman's Avatar
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    Re: anti vac on ecm giotto

    What happens when you crack open the steam?* The boiler pressure should decrease.

    Does the gauge move up/down as you can hear the boiler cut in/out?

    As the machine is heating up, you should hear some steaming sort of sound (steam coming out of AV valve), then it pops shut and noise stops and guage starts rising.

    Cheers

    Edit: Beaten to it. On my machine, the blockage is in the guage (tube to gauge is large diameter). I cleared it previously and it was fixed but has again recently become sticky. Must give it another go.

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    Re: anti vac on ecm giotto

    thanks for the reply guys

    ill pull the gauge out and have a look. The machine was descaled around 10 months ago.

    artman, i can hear the hissing noises as the machine heats up.

    the gauge drops to 0 when machine is turned off but takes a very long time.
    when turned on, it goes up as per normal, reaches 1 bar and stops, then slowly creeps to 1.5 and just sits there.
    there is no movement at all no matter what i do, steam milk, open the hot water, or adjust the pressure stat dial

  6. #6
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    Re: anti vac on ecm giotto

    Hows the coffee going? Boiler pressure could be anything if youve adjusted the pressurestat and the gauge sticks at 1.5 bar.

    If you adjust the pressurestat down, the gauge should stop at the new setting, theres no way it could go higher than the boiler pressure unless the needle is out of whack. Does it rest at 0?

  7. #7
    Senior Member artman's Avatar
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    Re: anti vac on ecm giotto

    Thats what mine used to do (and does now), slow to start rising, stops half way, sometimes goes to 1.x bar, takes ages to come back down to zero even with no boiler pressure. Hopefully yours is just the tube.

    Cheers

  8. #8
    Senior Member Dennis's Avatar
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    Re: anti vac on ecm giotto

    John, it really does sound like a blockage, and depending on the water quality where you live, 10 months since a descale may be well overdue.

    I suggest that if you are comfortable in doing it yourself, to start with that.

    See here for how to: http://coffeesnobs.com.au/YaBB.pl?num=1274615034

    Cheers
    Den (Cuppacoffee)

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    Re: anti vac on ecm giotto

    thanks again for all the replies and help.

    Rick, the coffee is going great, no issues at all, just getting a false reading i would say on the gauge.
    I adjusted the pressure both up and down, and no movement, but it does go back to 0 only when the machine is turned off though.
    If i open the hot water tap and fill a full cup of hot water, the gauge still reads 1.5bar when i know it should have dropped right down, and the proof of this was opening the steam wand, and sure enough, no steam pressure.
    Once pressure is back up, all is fine again.

    Dennis, i have no probs with descaling the machine myself. I have stripped it in the past and change, pressure stat, anti vac, and control module.

    Ill give her a good descale over the weekend

  10. #10
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    Re: anti vac on ecm giotto

    here are a couple of pics of the mushroom to just check scale build up




  11. #11
    TC
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    Re: anti vac on ecm giotto

    Hi John,

    Id definitely suggest a descale and think it might be a really good idea to look at some filtration/water softening as well.

    Cheers

    Chris

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    Re: anti vac on ecm giotto

    cheers Chris

    i opened her up just now, disconnected the gauge from the boiler and sure enough, right on the end of the tiny pipe from the gauge there was a small amount of hard scale stuck to it. Have removed it, hooked it all back up and fired it up.
    seems to be working fine for now.

    will descale it over the weekend

    thanks again everyone for your help

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    Re: anti vac on ecm giotto

    Hey John

    My gauge has been stuck for a while now but I havent been game to take it apart incase the fitting leaks... How do you seal the boiler fittings?

    Thanks :)

  14. #14
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    Re: anti vac on ecm giotto

    If the fitting doesnt leak now, it wont when you put it back on.... just dont overtighten it and split the nut!

  15. #15
    Senior Member artman's Avatar
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    Re: anti vac on ecm giotto

    Would they not be the standard taper type fitting, metal against metal, so you can unbolt and rebolt, just dont do it too tight. Similar principle to an olive on air lines.

    Cheers

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    Re: anti vac on ecm giotto

    Quote Originally Posted by 6F7C7A636F600E0 link=1318905825/14#14 date=1318930395
    Would they not be the standard taper type fitting, metal against metal, so you can unbolt and rebolt, just dont do it too tight.* *Similar principle to an olive on air lines.

    Cheers

    spot on, thats exactly how they are.

    dont be scared to take it off iaindb, and when putting it back on, no need to over tighten

  17. #17
    Senior Member artman's Avatar
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    Re: anti vac on ecm giotto

    Also, I have found a preloaded spanned with a sharp (small) tap of a hammer cracks things free easily and puts less "torque" on things than just pulling on the spanner.

    Cheers

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    Re: anti vac on ecm giotto

    what a standard taper fitting and an olive is I wouldnt have a clue! Im not scared to take it apart, I just dont want to be caught without a washer or something that may need replacing every time its taken off...

    I guess what youre saying is I wont need anything except a spanner! :)

  19. #19
    Senior Member artman's Avatar
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    Re: anti vac on ecm giotto

    Correct. [smiley=thumbsup.gif]

    Its basically a taper that tightens against a "lip" to provide the seal (sorry for poor description), but you will see when you take it apart.

    Cheers



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