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Date: 11 Nov 2006 17:14:30
From: sjames
Subject: La Marzocco - Clogged steam taps
Hello all,

Billy Wilson posted on this issue a few years ago:

> Our cafe has been using a 3 group La zocco since Mayish, and we
> have been experiencing problems with the wands. Every three weeks or
> so we notice the steam pressure dropping (despite boiler pressure) and
> the result is less than perfect foam. We end up taking the assembly
> apart and cleaning it out, but a few weeks later its filled with crud
> again. We know that the boiler is not contaminated, and the milk
> doesn't seem to get passed the valve... but we can't figure out why
> this keeps happening.
> We are not rookies on using machines, i.e. we purge the wands and
> clean them regularly. So what the hell is going on? We just can't
> figure out what is causing this. We've stumped the tech that helps
> us... but you guys know more than most techs... so what's up? Barry?
> Andy?

> Anybody?

Our FB70 is experiencing the same issue. Our tech supects it could be
a Steam Boiler Relief Valve issue, and has recommended purging the
relief valve once or twice a day. (He says the valve could be sticking
because the machine is on 24/7 and/or the valve has been lubricated
when it should be dry.)
I have just stripped both tap assemblies COMPLETELY and will purge the
relief valve daily from now on and see if it makes a difference.
In the meantime, has anyone overcome this issue.

Cheers,
Simon.





 
Date: 15 Nov 2006 04:24:34
From: Paul Pratt
Subject: Re: La Marzocco - Clogged steam taps

sjames wrote:
> On Nov 12, 6:11 pm, Barry Jarrett <b...@rileys-coffee.com> wrote:
> > On 11 Nov 2006 17:14:30 -0800, "sjames" <sam2...@yahoo.com> wrote:
> >
> > >Our FB70 is experiencing the same issue. Our tech supects it could be
> > >a Steam Boiler Relief Valve issue, and has recommended purging the
> > >relief valve once or twice a day. (He says the valve could be sticking
> > >because the machine is on 24/7 and/or the valve has been lubricated
> > >when it should be dry.
> >
> > why would that valve have any bearing on frothing ability?
>
> Barry (et al)
>
> Sorry, wrong valve. It's the "Anti Anti" valve he recommends purging.
>
> As per this thread (http://forum.coffeed.com/viewtopic.php?t=882),
> we're not the only people experiencing this problem on LM
> Lineas/FB70's. I've never experienced this problem on other
> manufacturers' machines. The build up of crud in the tap assembly is
> ridiculous. I wish I had my camera around when I stripped the tap
> assemblies 2 weeks ago. Every surface in the tap was covered in crud
> (EVERY!!!!!!).
> So far, LM's answer has been "It's due to full jugs being left under
> closed taps/wands). We follow the same procedures through all of our
> 12 sites (this includes purging before and after steaming), and it's
> only on our FB70 that we have this issue. The CMA's in our business
> don't have this issue at all.
>
> I've noticed that there's a different steam set up on the FB80 our
> roaster just received. Hmmmmmmmmmm!
>
> Any other thoughts/comments?
>
> Simon.

I have read the thread on coffeed. I am not sure what you are getting
at. What is the crud in the valve? One thing I would guess at is that
the crud is not milk - if you have milk up there you know it is milk.
The stench is awful and you don`t say that it is really smelly.

What is the water like when it comes from the hot water tap?

Also if it is the anti suction valve that shouldn`t need purging at
all. It`s meant to stay closed until the machine is switched off and
cools down.



 
Date: 15 Nov 2006 03:26:03
From: sjames
Subject: Re: La Marzocco - Clogged steam taps


On Nov 13, 3:11 am, "Alan" <in_flagra...@hotmail.com > wrote:
> "sjames" <sam2...@yahoo.com> wrote in messagenews:1163294070.334920.49620@m7g2000cwm.googlegroups.com...
>
>
>
> > Hello all,
>
> > Billy Wilson posted on this issue a few years ago:
>
> >> Our cafe has been using a 3 group La zocco since Mayish, and we
> >> have been experiencing problems with the wands. Every three weeks or
> >> so we notice the steam pressure dropping (despite boiler pressure) and
> >> the result is less than perfect foam. We end up taking the assembly
> >> apart and cleaning it out, but a few weeks later its filled with crud
> >> again. We know that the boiler is not contaminated, and the milk
> >> doesn't seem to get passed the valve... but we can't figure out why
> >> this keeps happening.
> >> We are not rookies on using machines, i.e. we purge the wands and
> >> clean them regularly. So what the hell is going on? We just can't
> >> figure out what is causing this. We've stumped the tech that helps
> >> us... but you guys know more than most techs... so what's up? Barry?
> >> Andy?
>
> >> Anybody?
>
> > Our FB70 is experiencing the same issue. Our tech supects it could be
> > a Steam Boiler Relief Valve issue, and has recommended purging the
> > relief valve once or twice a day. (He says the valve could be sticking
> > because the machine is on 24/7 and/or the valve has been lubricated
> > when it should be dry.)
> > I have just stripped both tap assemblies COMPLETELY and will purge the
> > relief valve daily from now on and see if it makes a difference.
> > In the meantime, has anyone overcome this issue.
>
> > Cheers,
> > Simon.Unless I've totally misunderstood the original poster, he seems to be
> complaining of diminished steaming capacity due to a fairly regular buildup
> of "crud" inside what he calls the "assembly" (although he is careful to
> note that the boiler is not contaminated and that the milk doesn't seem to
> get past the valve).
> In my experience, if your steaming technique involves plunging the wand into
> the milk and THEN turning the steam on, followed by turning the steam off
> and THEN exiting the milk, you're always going to get a buildup of "crud"
> inside the wand, no matter how much you"purge" the wand. You're only going
> to be able to "purge" any milk which has still remained liquid, and a
> buildup of "crud" is inevitable.
> If you turn the steam on just a bit before plunging into the milk, open it
> wide for the frothing job, then reduce the steam to a trickle as you exit
> the milk, you shouldn't be getting any milk inside your wand. No milk
> inside the wand means no "crud"-buildup.

Alan,

Thanks. I'm not that concerned about milk contaminating the steam
wand. LM have designed this machine (FB70/Linea) with wand
contamination in mind. The wands are easily removed for cleaning.
However, crud build up inside the tap assembly is VERY concerning.
It's time consuming, and eventually the pipe between the tap and the
boiler will crack at the flange due to the stress of removal and
reassembly.

Simon.



 
Date: 15 Nov 2006 03:18:19
From: sjames
Subject: Re: La Marzocco - Clogged steam taps


On Nov 12, 6:11 pm, Barry Jarrett <b...@rileys-coffee.com > wrote:
> On 11 Nov 2006 17:14:30 -0800, "sjames" <sam2...@yahoo.com> wrote:
>
> >Our FB70 is experiencing the same issue. Our tech supects it could be
> >a Steam Boiler Relief Valve issue, and has recommended purging the
> >relief valve once or twice a day. (He says the valve could be sticking
> >because the machine is on 24/7 and/or the valve has been lubricated
> >when it should be dry.
>
> why would that valve have any bearing on frothing ability?

Barry (et al)

Sorry, wrong valve. It's the "Anti Anti" valve he recommends purging.

As per this thread (http://forum.coffeed.com/viewtopic.php?t=882),
we're not the only people experiencing this problem on LM
Lineas/FB70's. I've never experienced this problem on other
manufacturers' machines. The build up of crud in the tap assembly is
ridiculous. I wish I had my camera around when I stripped the tap
assemblies 2 weeks ago. Every surface in the tap was covered in crud
(EVERY!!!!!!).
So far, LM's answer has been "It's due to full jugs being left under
closed taps/wands). We follow the same procedures through all of our
12 sites (this includes purging before and after steaming), and it's
only on our FB70 that we have this issue. The CMA's in our business
don't have this issue at all.

I've noticed that there's a different steam set up on the FB80 our
roaster just received. Hmmmmmmmmmm!

Any other thoughts/comments?

Simon.



  
Date: 15 Nov 2006 16:40:05
From: Barry Jarrett
Subject: Re: La Marzocco - Clogged steam taps
On 15 Nov 2006 03:18:19 -0800, "sjames" <sam2jam@yahoo.com > wrote:

>As per this thread (http://forum.coffeed.com/viewtopic.php?t=882),
>we're not the only people experiencing this problem on LM
>Lineas/FB70's. I've never experienced this problem on other
>manufacturers' machines. The build up of crud in the tap assembly is
>ridiculous. I wish I had my camera around when I stripped the tap
>assemblies 2 weeks ago. Every surface in the tap was covered in crud
>(EVERY!!!!!!).

<shrug > i've been using LMs for six years and haven't had any
problems with the steam valves (other than needed to replace o-rings
now and then).

wtf is an "anti anti" valve? i'm starting to think you tech needs to
find another line of work.



 
Date: 12 Nov 2006 16:11:07
From: Alan
Subject: Re: La Marzocco - Clogged steam taps

"sjames" <sam2jam@yahoo.com > wrote in message
news:1163294070.334920.49620@m7g2000cwm.googlegroups.com...
> Hello all,
>
> Billy Wilson posted on this issue a few years ago:
>
>> Our cafe has been using a 3 group La zocco since Mayish, and we
>> have been experiencing problems with the wands. Every three weeks or
>> so we notice the steam pressure dropping (despite boiler pressure) and
>> the result is less than perfect foam. We end up taking the assembly
>> apart and cleaning it out, but a few weeks later its filled with crud
>> again. We know that the boiler is not contaminated, and the milk
>> doesn't seem to get passed the valve... but we can't figure out why
>> this keeps happening.
>> We are not rookies on using machines, i.e. we purge the wands and
>> clean them regularly. So what the hell is going on? We just can't
>> figure out what is causing this. We've stumped the tech that helps
>> us... but you guys know more than most techs... so what's up? Barry?
>> Andy?
>
>> Anybody?
>
> Our FB70 is experiencing the same issue. Our tech supects it could be
> a Steam Boiler Relief Valve issue, and has recommended purging the
> relief valve once or twice a day. (He says the valve could be sticking
> because the machine is on 24/7 and/or the valve has been lubricated
> when it should be dry.)
> I have just stripped both tap assemblies COMPLETELY and will purge the
> relief valve daily from now on and see if it makes a difference.
> In the meantime, has anyone overcome this issue.
>
> Cheers,
> Simon.

Unless I've totally misunderstood the original poster, he seems to be
complaining of diminished steaming capacity due to a fairly regular buildup
of "crud" inside what he calls the "assembly" (although he is careful to
note that the boiler is not contaminated and that the milk doesn't seem to
get past the valve).
In my experience, if your steaming technique involves plunging the wand into
the milk and THEN turning the steam on, followed by turning the steam off
and THEN exiting the milk, you're always going to get a buildup of "crud"
inside the wand, no matter how much you"purge" the wand. You're only going
to be able to "purge" any milk which has still remained liquid, and a
buildup of "crud" is inevitable.
If you turn the steam on just a bit before plunging into the milk, open it
wide for the frothing job, then reduce the steam to a trickle as you exit
the milk, you shouldn't be getting any milk inside your wand. No milk
inside the wand means no "crud"-buildup.




 
Date: 12 Nov 2006 05:45:28
From: Paul Pratt
Subject: Re: La Marzocco - Clogged steam taps

Barry Jarrett wrote:

> On 11 Nov 2006 17:14:30 -0800, "sjames" <sam2jam@yahoo.com> wrote:
>
> >Our FB70 is experiencing the same issue. Our tech supects it could be
> >a Steam Boiler Relief Valve issue, and has recommended purging the
> >relief valve once or twice a day. (He says the valve could be sticking
> >because the machine is on 24/7 and/or the valve has been lubricated
> >when it should be dry.
>
>
> why would that valve have any bearing on frothing ability?

take your pick, v-b or the safety valve. Neither should be touched.



 
Date: 12 Nov 2006 07:11:30
From: Barry Jarrett
Subject: Re: La Marzocco - Clogged steam taps
On 11 Nov 2006 17:14:30 -0800, "sjames" <sam2jam@yahoo.com > wrote:

>Our FB70 is experiencing the same issue. Our tech supects it could be
>a Steam Boiler Relief Valve issue, and has recommended purging the
>relief valve once or twice a day. (He says the valve could be sticking
>because the machine is on 24/7 and/or the valve has been lubricated
>when it should be dry.


why would that valve have any bearing on frothing ability?