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Bezzera B2000 Compact - Pressure & Temp woes :-(
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pablomole
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Joined: 14 Jan 2014
Posts: 1
Location: Cheshire
Expertise: I love coffee

Posted Tue Jan 14, 2014, 6:46am
Subject: Bezzera B2000 Compact - Pressure & Temp woes :-(
 

Hi all,

had this machine for just over two years... first one, can't complain... seems to work well....

The safety valve started hissing recently, so I changed that and it was grand... a few days later, the temperature is not getting high enough so there is no steam on the wand, and the hot water is ... well... hot, but not hot enough. Occasionally the machine will get hot enough, but then it loses it...

I have no manual for the machine, so can't see an option to change the temperature - although guessing its a fault with a part, as it occasionally works?

help ?!?!

Paul.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,775
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
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Vac Pot: 40s era Silex
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Roaster: gave it a try, decided no
Posted Tue Jan 14, 2014, 11:38am
Subject: Re: Bezzera B2000 Compact - Pressure & Temp woes :-(
 

Welcome to the board.

That is a Heat Exchanger commercial machine. It uses a Pressure stat to regulate the temp of the water in the boiler to steam pressure of about 1.4 bar.

It sounds like the Pressure stat is going bad and is likely the cause of the over temp that caused you to replace the safety valve. They almost never just ... fail, most likely, it was doing it's job as intended and may not have been bad.

If you have had it for two years I am going to take a guess that you have never descaled the machine. That is normal service and should be done (depending on your water ) every six months to eighteen months.

To that, the group heads need to be back flushed at least every day in commercial service or every session or two in the home, with clear water and perhaps once a week with detergent.

Then the dispersion screens should be removed and cleaned about once a month in a home setting.

The Pressure stat is a device that is sensitive to pressure. It is plumbed into the boiler and if the pressure is low, it turns the heater on to warm up the water, when the pressure reaches the set value, it turns the heater off, in this way it regulates the temp of the boiler to, as I said, about 1.3 or so bar which translates to about 240 to 260 Deg F. depending on how you set your machine to operate.

 
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