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V2B noise
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Discussions > Espresso > Machines > V2B noise  
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 73
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Sat Nov 2, 2013, 5:44am
Subject: V2B noise
 

I figured it is time to start a new thread on this topic.

Dave's request for tests:

I would like some you to do some tests to help me.

- Attach the pipe to the bottom of the machine, switch it into plumbed mode, stick the pipe into a bottle of water on the counter and run with that for a week.
- Does anyone with the machine plumbed have this problem
- Switch the machine from tanked, to mains and back 3 times, does the problem go away
- I always wanted a cap on that mains connector (someone go down the plumbing store and get a cap with rubber pad to seal that mains inlet).

Observe the brew pressure gauge each time before a shot and anything else about your routine and then report back. Perhaps somewhere in all this an answer will appear.

My machine is runs as follows:
- RO+ bicarb @ 70 TDS
- nothing on the intake tube
- offset is 27F (15C)
- group temp set to 200F

when the noise occurs, the pressure is slow to clime up.
also i noticed that if you do not feed the water to (close the intake), same noise occures

not sure if this helps....
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 73
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Sat Nov 2, 2013, 7:16am
Subject: Re: V2B noise
 

couple of more things:
- expansion valve is set to between 11 and 11.5 bar
- and i typically de-pressurize the brew cycle after brewing, want to stay consistent with this for now.
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,418
Location: UK
Expertise: I love coffee

Posted Sat Nov 2, 2013, 9:13am
Subject: Re: V2B noise
 

Tonyv138 Said:

couple of more things:
- expansion valve is set to between 11 and 11.5 bar
- and i typically de-pressurize the brew cycle after brewing, want to stay consistent with this for now.

Posted November 2, 2013 link

OK I NEVER depressurise the brew cycle after brewing = difference in technique

I do this to maintain some back pressure for valves that work better with it....the pressure helps keep the brew system valves sealed tighter (group and backflow valves!). It also raises the BP of water in brew boiler and prevents any headpsace formation from steam within brew boiler. I would strongly recommend you do not de-pressurise the group after brewing (on any machine).
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,030
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Nov 2, 2013, 10:41am
Subject: Re: V2B noise
 

"depressurize the brew cycle after brewing" I have no idea that means.  Please explain like I am simple.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,418
Location: UK
Expertise: I love coffee

Posted Sat Nov 2, 2013, 11:30am
Subject: Re: V2B noise
 

Coffeenoobie Said:

"depressurize the brew cycle after brewing" I have no idea that means.  Please explain like I am simple.

Posted November 2, 2013 link

Pull shot, lift lever stop shot, pressure in brew path shown on gauge. Lift lever a little until water comes out of group (but don't let pump engage). Brew pressure gauge drops to 0 and brew path is depressurized..

However, I am assuming you don't have a V2B or an E61 group machine as you're profile says you have an Oscar?
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,030
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Nov 2, 2013, 12:43pm
Subject: Re: V2B noise
 

Thank you. Yes, I have Oscar, but I still like to understand what I am reading.  Also, if I did not know maybe someone else would not but be afraid to ask.  I am not afraid of looking silly.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,418
Location: UK
Expertise: I love coffee

Posted Sat Nov 2, 2013, 4:53pm
Subject: Re: V2B noise
 

Coffeenoobie Said:

Thank you. Yes, I have Oscar, but I still like to understand what I am reading.  Also, if I did not know maybe someone else would not but be afraid to ask.  I am not afraid of looking silly.

Posted November 2, 2013 link

I didn't mean it like that at all, what I meant was I didn't expect you to know, because my assumption was your profile was still correct and you wouldn't have experience of an E61 and hence it was reasonable and you were not "being being simple" to ask. I was not being critical at all?
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pShoe
Senior Member


Joined: 13 Nov 2012
Posts: 57
Location: Fort Lauderdale
Expertise: I love coffee

Posted Sat Nov 2, 2013, 5:56pm
Subject: Re: V2B noise
 

Posted by Carlo in the mega thread. I felt it was worthwhile to cross post it here,

CarloM Said:

Dave - tried the switch from tank to mains three times and it still did it. I switched back and forth with the power off (machine plugged in but power not on). Do you need to do it with the power on?

Also, regarding OPV - when I draw about 2oz (which I think is about 60ml) the pressure gauge rests back between 4-5, and then slowly creeps back up to ~9 after a few minutes. Is this correct or do I need to adjust?

Many thanks!

Posted November 2, 2013 link

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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,418
Location: UK
Expertise: I love coffee

Posted Sat Nov 2, 2013, 8:03pm
Subject: Re: V2B noise
 

pShoe Said:

Posted by Carlo in the mega thread. I felt it was worthwhile to cross post it here,

Posted November 2, 2013 link

Yeah I would switch between mains and tanked with the power switch on the machine on. It is a long shot, but perhaps air is bleeding in/or leaking from one of the solenoid valves...I don't think so, but easy enough to try by simply switching them a few timess, which will reseat em when they're new.

If I clean the group, which could be 2-3oz, normally I see the pressure gauge go up to 11.5 bar AFTER i shut of the pump, or just above, which shows me what pressure the OPV is adjusted to. It's normal due to expansion of cold water that enters the tank. You're expansion valve (OPV) should be set to around 11.5 or 12 bar. You can check this easily, by:

putting in a  blind filter
removing the cup rack under the group

Pull a shot against the blind filter and adjust up the pump pressure until you start getting a flow (not the odd drip) out of the expansion valve outlet (you can see it in the drip tray). This should happen at about 11.5 to 12 bar. if it happens much below 11 bar, you need to tighten up the expansion valve (case removal required).
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pShoe
Senior Member


Joined: 13 Nov 2012
Posts: 57
Location: Fort Lauderdale
Expertise: I love coffee

Posted Sat Nov 2, 2013, 8:23pm
Subject: Re: V2B noise
 

Mine has the correct pressure settings. I made a video of it a while back for documentation purposes. If it helps anyone, this is the link to the video. The first part is running water with no PF, than with a blind basket, and than allowing the ramp to the OPV setting. The OPV section was sped up.
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