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Breville BES900 hydraulic diagram + some technical details
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witoldb
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Posted Thu Nov 7, 2013, 2:07pm
Subject: Breville BES900 hydraulic diagram + some technical details
 

I bought used BDB for $160 from owner who replaced it with Rocket R58.
It was not delivering any flow/pressure (0 reading on gauge) but it was very easy to change damaged o-rings in 3-way solenoid valve.
After this, pressure was restored to 10 bar; adjusted it down to 9 bar.
While having it opened, I drew basic hydraulic diagram.
Please let me know in case of any errors - I'm not sure about 2 probes in brew boiler (marked with ?).
Also I'm not sure where is the vacuum breaker - is it combined with PSV on steam boiler?
I can hear it closing during heating-up.
Machine takes 5 min 25 sec to heat from 21 to 93 deg C.
So far machine works fine but I'm concerned about heat generated inside the box and its long term effects on plastic .
I think that it will be good to insulate the boilers as I don't use top cover to preheat the cups.

witoldb: hydraulic diagram.JPG
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witoldb
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Location: Dubai UAE
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Posted Thu Nov 7, 2013, 2:08pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Damaged o-rings

witoldb: 3way solenoid.JPG
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witoldb
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Location: Dubai UAE
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Posted Thu Nov 7, 2013, 2:09pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Dimensions of o-ring recess

witoldb: O-ring groove.JPG
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witoldb
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Joined: 15 Aug 2013
Posts: 118
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Nov 7, 2013, 2:10pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Details of triacs and drivers bolted to top cover. They are getting quite hot from internal heat and may fail in a long term.
MOC3063 is zero-crossing phototriac driver/optocoupler.
Q6015L5 triac is rated 15A/600V - there are 2 and they have metal tabs; I think they are for boilers.
T435T-600 triac is rated 4A/600V - one with plastic body, should be for the group heater.
Also I found 2 triacs (BT136-600) inside control box probably for the pumps and one Tyco relay ( PCD-112D2MH, 10A contacts, 12V DC coil) probably for 3-way solenoid.

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witoldb
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Joined: 15 Aug 2013
Posts: 118
Location: Dubai UAE
Expertise: I like coffee

Espresso: Sanremo Treviso LX,...
Grinder: Vario,Elektra MXS,...
Roaster: DIY 250g drum roaster
Posted Thu Nov 7, 2013, 2:11pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

I have small chemical pump with teflon trim which I will use for descaling with diluted rydlyme.
All tubing in BDB is 4mm teflon with push-in fittings so it will be easy to get pneumatic fittings and make a circuit similar to in-situ heat exchanger cleaning.

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jonr
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Posted Thu Nov 7, 2013, 4:46pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Interesting.  Given that the brew boiler input comes from a HX, I suspect that the BES900 has no options other than a very flat brew temperature profile.  But many people (including me) prefer a slightly declining profile.  Does anyone have temp vs time graphs?
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JohnLyn
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JohnLyn
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Posted Thu Nov 7, 2013, 10:34pm
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Nice work! I knew someone would start diggin into this machine.
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calblacksmith
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calblacksmith
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Posted Fri Nov 8, 2013, 6:38am
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

I am pretty suprised to see so much corrosion on the Al parts so soon.

For descaling, use a retail product designed for the job, I have not heard of the solution you plan to use. That does not mean that it is bad or even not a commercial solution, I have just not heard of it. Best to stay food safe and by the looks of the AL parts, a mild solution would be best.

For that price it was worth picking up and playing with. If they were all at that price or even twice that, I would be singing their praises but at the retail price, not so much.

Good luck with the project and may it serve you well!

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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jonr
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Posted Fri Nov 8, 2013, 10:08am
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

Aluminum has some nice properties, but it doesn't play well with other metals.   A magnesium anode (like a water heater has) would help.  Or at least turn the machine off when not in use to reduce the corrosion rate.
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Carneiro
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Posted Wed Jan 22, 2014, 7:20am
Subject: Re: Breville BES900 hydraulic diagram + some technical details
 

So nice to have this available. I found a BES900 here, 220V from Australia, and I plan to use it at work, with around 5-6 coworkers. I fear for the problems it can develop, but I have some skills with machines, hopefully I will fix them and add some more info here too.

I thought the BDB group was made from aluminum but with all the water path with some coating or made of stainless steel tubing... Did anybody have the chance to see if there is more corrosion at the group? The Gaggias are classic, for instance, with the dispersion screen made of aluminum, it gets badly corroded.

Thanks,

Márcio.
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