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Another DB Quickmill
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Discussions > Espresso > Machines > Another DB...  
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sharky
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sharky
Joined: 9 Jan 2013
Posts: 182
Location: Calgary, AB
Expertise: I love coffee

Espresso: QM Vetrano 2B
Grinder: Compak K3 Touch
Posted Fri Sep 27, 2013, 9:37am
Subject: Re: Another DB Quickmill
 

Tony, I believe you mean 9bar instead of psi, no??  That amount of psi would be sooooooo tiny!  LOL!




Tonyv138 Said:

a follow up on pump pressure.... Mine does the following:

-Blind filter - 10psi
-Just water running through portafilter- 9.0psi
-Portafilter loaded with coffe - 9.5 and extracting, seems to be extracting properly

am i grinding too fine? or better yet, is there a way to check the pump pressure without expensive tools?thanks

Posted September 27, 2013 link

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DavecUK
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Joined: 21 Sep 2005
Posts: 1,392
Location: UK
Expertise: I love coffee

Posted Fri Sep 27, 2013, 10:16am
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

a follow up on pump pressure.... Mine does the following:

-Blind filter - 10psi
-Just water running through portafilter- 9.0psi
-Portafilter loaded with coffe - 9.5 and extracting, seems to be extracting properly

am i grinding too fine? or better yet, is there a way to check the pump pressure without expensive tools?

thanks

Posted September 27, 2013 link

With a blind filter does it rise, hold at 9 bar for a bit then gradually start rising again....see the other guys video above?
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Tonyv138
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Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Fri Sep 27, 2013, 1:47pm
Subject: Re: Another DB Quickmill
 

sorry my bad - par, not psi

Just run the test, climbs to 9bar, holds momentarly, climbs to 10bar, and stays steady @10bar. I guess this is normal, right?

Another observation: there is a steady flow of water drops into the tray (i want to say 30sec apart), i guess this is from the safety valve. Is this normal? This is far more pronounced when i use the blind filter. When machine is left alone heated up, it appears that the dripping slows downsignificantly to perhaps 1 drop/min.

My PID shows the temp of the pressure boiler to be 255F and pressure between 1.3 and @1.4bar
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DavecUK
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Joined: 21 Sep 2005
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Location: UK
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Posted Fri Sep 27, 2013, 4:46pm
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

sorry my bad - par, not psi

Just run the test, climbs to 9bar, holds momentarly, climbs to 10bar, and stays steady @10bar. I guess this is normal, right?

Another observation: there is a steady flow of water drops into the tray (i want to say 30sec apart), i guess this is from the safety valve. Is this normal? This is far more pronounced when i use the blind filter. When machine is left alone heated up, it appears that the dripping slows downsignificantly to perhaps 1 drop/min.

My PID shows the temp of the pressure boiler to be 255F and pressure between 1.3 and @1.4bar

Posted September 27, 2013 link

It's an expansion valve, as the water is heated, it expands, this pressure is relieved at around 12 bar, causing dripping into the tray. Once hot and undisturbed, this dripping should slow down and stop. If when putting against a  blind filter there is a flow of water, then this valve is not set high enough, or your pump pressure is set too high (e.g. above 11 or 12 bar). If again it's just the odd drip...no problem. It's simple expansion of water.
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Tonyv138
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Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Fri Sep 27, 2013, 7:44pm
Subject: Re: Another DB Quickmill
 

Dave, I adjusted the pump pressure to run with the blind filter @9bar. Now it stops momentarly at just above 8bar and climbs to 9bar and sits there. After I lower the grouphead handle, i see water dripping into the tray at a fairly high rate, i'd say faster than a drop/sec, then it slows down. Meanwhile the pressure climbs up to 10bar. Then as the machine is sitting hot, the pressure was dropping, but the dripping continued at a rate of 1 drop/min.

Is this normal?

How does one adjust this valve anyways?

Another note, i had to tighten up the grind to get ~30 sec @9bar.
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,392
Location: UK
Expertise: I love coffee

Posted Sat Sep 28, 2013, 3:58am
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

Dave, I adjusted the pump pressure to run with the blind filter @9bar. Now it stops momentarly at just above 8bar and climbs to 9bar and sits there. After I lower the grouphead handle, i see water dripping into the tray at a fairly high rate, i'd say faster than a drop/sec, then it slows down. Meanwhile the pressure climbs up to 10bar. Then as the machine is sitting hot, the pressure was dropping, but the dripping continued at a rate of 1 drop/min.

Is this normal?

How does one adjust this valve anyways?

Another note, i had to tighten up the grind to get ~30 sec @9bar.

Posted September 27, 2013 link

Sounds as if you have now adjusted it incorrectly....try this:

With the machine cold, switch off the brew boiler F02=3. Then check your pressure and watch the expansion valve outlet to see what happens in the drip tray. During the pull against a blind filter then after. Report back your observations.
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Tonyv138
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Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Sat Sep 28, 2013, 5:21am
Subject: Re: Another DB Quickmill
 

with f02=3
- a first pull with blind filter - 2 or 3 drops of water into the tray, subsequent pulls, no water. Pressure istis just above 9 bars
- with no filter, pressure rises just above 8 bar and sits there.
i do not think i saw any drops into the tray

back to f02=4, need coffee
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,392
Location: UK
Expertise: I love coffee

Posted Sat Sep 28, 2013, 9:50am
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

with f02=3
- a first pull with blind filter - 2 or 3 drops of water into the tray, subsequent pulls, no water. Pressure istis just above 9 bars
- with no filter, pressure rises just above 8 bar and sits there.
i do not think i saw any drops into the tray

back to f02=4, need coffee

Posted September 28, 2013 link

With the machine cold and the brew boiler switched off, run against a blind filter and lower the pressure to 9 bar.
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DeanOK
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DeanOK
Joined: 24 Sep 2012
Posts: 649
Location: OK
Expertise: I like coffee

Espresso: QM Vetrano 2B
Grinder: Vario W
Posted Sat Sep 28, 2013, 9:56am
Subject: Re: Another DB Quickmill
 

DavecUK Said:

With the machine cold and the brew boiler switched off, run against a blind filter and lower the pressure to 9 bar.

Posted September 28, 2013 link

I don't know a way to run the pump with the brew boiler turned off unless there is a way in the PID to just turn the brew boiler heater off or low enough it wont come on. The pump and the brew heating circuit are on the same power switch.
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Tonyv138
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Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Sat Sep 28, 2013, 10:20am
Subject: Re: Another DB Quickmill
 

Dean: f02=3 turns off the boiler

Thanks Dave. Will do, and report again. I think the machine needs to cool off for multiple hours before room temp...
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