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Breville Dual Boiler BES900XL Owners Thread

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SupraTT
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Joined: 26 Apr 2012
Posts: 19
Location: SoCal
Expertise: I love coffee

Posted Mon Apr 30, 2012, 6:16pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

My shots are all hitting 10 BAR - is that okay?

occoffeefan
Senior Member

Joined: 27 Sep 2008
Posts: 36
Location: occoffeefan
Expertise: I love coffee

Espresso: Breville Dual Boiler
Grinder: Baratza Vario W, Mazzer Mini...
Roaster: Behmor

Posted Tue May 1, 2012, 6:24pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

My Breville dual boiler is set at 10.5 bar blind and pulls a shot at 9.8 bar. I called Breville customer support and I was told that my machine's OPV pressure was set at the factory and does not need adjustment. I read elsewhere that I could vary the pressure during the shot by opening the hot water valve sligthly.. It works well and I can test a shot at any pressure I desire. I pulled a shot and brought the pressure down to 9 bar and the shot tasted sweet! I am considering adjusting the OPV valve, but I do not want to void the warranty. Would Breville know if I opened the machine?

Posted Tue May 1, 2012, 6:50pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

Pressure surfing on the Breville on the fly.. I should have mentioned in my previous post to all those who are concerned if their pressure is set too high or low on the breville, you can use the hot water valve to test pressures ( only if your machine is set high to begin with). The hot water valve bleeds water from the brew boiler. When you first open the valve you can vary the pressure during your shot pull with very small turns on the knob. The pump will not engage until you open the valve more. This allows you to test your machine at any pressure between 8 to 10 bars easily. Very little water comes out of the hot water nozzle, I just let it fall into the drip tray. This will answer your questions as to whether you should set your OPV valve to a different pressure. This is a great undocumented feature on the Breville.

Posted Tue May 1, 2012, 7:36pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

One other trick .. changing the portafilter spring... I found that if you want to try other ridged filter baskets and they are too tight to snap into the portafilter, if you replace the breville portafilter spring with a rancilio portafilter spring, all ridged filter baskets will snap in and out easily. I know there has been a lot of discussion regarding the merits of various baskets, I only offer this if you wish to try different ridged baskets. You can find the spring using a google search.

SupraTT
Senior Member

Joined: 26 Apr 2012
Posts: 19
Location: SoCal
Expertise: I love coffee

Posted Tue May 1, 2012, 11:51pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

So, if your machine goes past 9 bar when pulling a shot, then it is an OPV issue/mis-calibration? My machine begins with 1149... I thought breville fixed the opv issue starting with 1144 serials?

Posted Wed May 2, 2012, 1:46am Subject: Re: Breville Dual Boiler BES900XL Owners Thread

when i talked to breville customer support, they indicated that a pressure between 8 to 10 during pulling a shot was acceptable. Even though my machine blinded at 10.5, it still pulled a shot under 10 bar. It was set at the factory, my serial number was checked

klund
Senior Member

Joined: 31 Mar 2012
Posts: 71
Location: Southern MN, USA
Expertise: I like coffee

Espresso: Breville Dual Boiler
Grinder: Baratza Vario-W

Posted Wed May 2, 2012, 5:08am Subject: Re: Breville Dual Boiler BES900XL Owners Thread

occoffeefan Said: One other trick .. changing the portafilter spring... I found that if you want to try other ridged filter baskets and they are too tight to snap into the portafilter, if you replace the breville portafilter spring with a rancilio portafilter spring, all ridged filter baskets will snap in and out easily. I know there has been a lot of discussion regarding the merits of various baskets, I only offer this if you wish to try different ridged baskets. You can find the spring using a google search. Posted May 1, 2012 link Would the rancilio spring keep the stock basket in place, but make it easier to remove it? I've waffled between spring in (less messy clean up) and spring out (easier removal/loading of basket) a couple of times.

-- klund Well then, you should see me without coffee.

Posted Wed May 2, 2012, 5:36am Subject: Re: Breville Dual Boiler BES900XL Owners Thread

yes it will keep the stock basket in place as well as other baskets.

SupraTT
Senior Member

Joined: 26 Apr 2012
Posts: 19
Location: SoCal
Expertise: I love coffee

Posted Wed May 2, 2012, 1:08pm
Subject: Re: Breville Dual Boiler BES900XL Owners Thread

occoffeefan Said:

when i talked to breville customer support, they indicated that a pressure between 8 to 10 during pulling a shot was acceptable.
Even though my machine blinded at 10.5, it still pulled a shot under 10 bar. It was set at the factory, my serial number was checked

Posted May 2, 2012 link

Does dosing, grind, and/or tamping affect the brew pressure?

Posted Wed May 2, 2012, 4:34pm Subject: Re: Breville Dual Boiler BES900XL Owners Thread

yes, it would, but it seems under normal circumstances, the blind pressure is about 0.5 bar above the extraction pressure. ( i weight out 19 grams, tamp at 30 lb (espro tamp) and grind to pull 2 oz at about 25 seconds, although I usually cut the shot short once blonding becomes prevalent.

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