2013-11-01
The manual for the Buon CaffΓ© model 330 claims that the machine βprovides outstanding steaming powerβ, but experience has shown it to be lacking. Fortunately, it can be made more powerful by exploiting a mechanical design flaw.
On the front of the machine is a dial with stops at Steam, Ready, and Brew:
At Ready, the heating element is regulated by a thermostat so as to maintain a steady internal steam pressure. At Steam, the heating element is unregulated and a valve is opened to allow steam to escape:
Position | Heating element | Wand valve |
---|---|---|
Ready | Regulated by thermostat | Closed |
Steam | Unregulated | Open |
Behind the dial, these simple βprogramsβ are encoded in a plate cam. Rotating the dial causes the cam to press and release switches that control individual components such as the heating element or a solenoid valve.
There is a slight flaw in the transition from Ready to Steam, however. At this unlabeled positionβ
βthe heating element is unregulated but the escape valve is not yet opened:
Position | Heating element | Wand valve |
---|---|---|
Ready | Regulated by thermostat | Closed |
Unlabeled | Unregulated | Closed |
Steam | Unregulated | Open |
Once set to this position, a clock is ticking. Steam pressure builds up with no escape, and left unattended the machine would self-destruct. But this power can be wielded.
Taken to the brink of catastrophe, but released in time, the model 330 can provide outstanding steaming power indeed.