Bedienungsanleitung Vibiemme domobar (Seite 40 von 44) (Englisch)

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small adjustment keeping in mind that it should be set to best match the coffee you drink most of the time. The

best test to judge the setting is your palate, but it will take time and practice to get consistent enough to sense the

difference in taste.

The pressure gauge on the front panel should only be used as a general indicator as to what is happening

during the brewing cycle. The only time when the gauge will display any useful information is when there is a

properly prepared portaﬁlter, ﬁlled with properly ground and tamped coffee, locked in the grouphead, and the

brewing process is underway. At all other times, even when the pump is reﬁlling the boiler this gauge is not dis-

playing any useful information and should be ignored. Even when the pull is underway the brew gauge will read

a little higher than the actual brew pressure at the coffee.

If the pressure gauge is reading a very low pressure during a pull, the ﬁrst thing to suspect is the coffee. The

problem could be:

- not enough coffee in the portaﬁlter

- coffee not properly distributed before tamping

- coffee not tamped properly or evenly

- coffee ground too coarse

If the pressure gauge is reading a high pressure during a pull it is almost always a matter of a poorly adjusted

over pressure relief valve. The indicated brew pressure during a pull should never indicate more than about 9.5

to 10 BAR.

If after attempts to resolve a pressure related problem by adjusting the above factors have failed it is time

to try adjustment of the pressure regulator. Do not attempt to adjust the valve by means other than described as

above.

Pressurestat Adjustment

The pressurestat controls the brewing temperature by sensing the pressure in the boiler. If the pressure is too

high the brewing temperature will be too high and the coffee can taste burnt or bit-

ter. It can also cause excessive steam in the heat exchanger which contributes to the

over-extraction and can create so much force that the steam can blast through the

puck and cause a fast ﬂow. On the other hand, if the pressure is too low, the brew

temperature will be too low. The coffee will taste sour, under-extracted, and thin.

Of course, these can be experienced through a whole range of tastes, and incorrect

brewing temperature may not always be the cause of bad taste, bitter or sour.

Accessing the pressurestat adjustment is simple. Simply remove the cup warm-

ing tray and beneath that you will see a perforated panel with a black plug. Remove

the plug and the adjustment screw will be seen underneath as shown here. Turn the screw to adjust the boiler

temperature:

CLOCKWISE LOWERS the TEMPERATURE

COUNTERCLOCKWISE RAISES the TEMPERATURE

This adjustment is not very sensitive, so even a full turn of the screw is a ﬁne adjustment, and that’s a good

thing because the generally accepted range is between .9 and 1.1 BAR. Still, it is important to make changes

slowly and in small increments. Temperature of the brew water is a critical component of good espresso, and a

change of one degree in the brewing temperature can make a big difference in the taste of the coffee.

In actual operation the function of pressurestat will create what is referred to as a “deadband.” That is the

range of temperature ﬂuctuation caused the lag in time between when the heating element is energized to the time

it turns it off. The deadband of the Vibiemme Domobars is about .15 BAR. So if you set the pressurestat for about

1 BAR, the gauge indicating boiler pressure might range from about .9 to 1.1. This is normal operation for all

machines with pressurestats and is a function of the pressurestat design. To hold a smaller range of temperature

the pressurestat would be clicking on and off every two or three seconds and would rapidly burn its contacts.

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