Bedienungsanleitung Vibiemme domobar (Seite 7 von 15) (Englisch)

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4.3. Start Up: grouphead

The Vibiemme Domobar is manual in its function with only one switch controlled by a lever on the

grouphead itself. Grouphead. It is shown in its at-rest position. This is where the lever should be

whenever the machine is not brewing espresso.

When the lever is lifted just past the ﬁrst click stop, the passive pre-infusion begins. This allows a slight

ﬂow of water onto the coffee. This gentle ﬂow of water wets the puck slightly, which helps with extraction

and can also help eliminate channeling (disruption of the coffee causing a fast ﬂow). It is not necessary to

use this position, but leaving it in this mode for about two or three seconds can be useful.

Lifting the Manual Control Lever to its full up position opens the brewing path between the boiler and

the coffee. At the same time, the cam to which the lever is attached depresses the switch on the front of

the Vibiemme (just to the right of the E-61 grouphead, behind the cam). This switch activates the pump.

When you choose to end the brewing cycle, return the Manual Control Lever to its at-rest, fully down

position. Moving the Manual Control Lever to this position turns off the pump closing the brewing

path opening discharge valve which is built into the grouphead.

This is a path from the grouphead down through the lower portion of the casting, and into the drip tray.

When opened, it allows the pressure remaining in the brewing path to ﬂow into the drip tray. This allows

you to immediately remove the Portaﬁlter without worrying about the “portaﬁlter sneeze”- a spurt of

coffee or hot water from conﬁned pressure as can happen on lesser machines without a 3-way valve.

4.4. Start up: brew pressure gauge

The Brew gauge (scale 0 to 16 bar) displays the pressure in the brewing path during an espresso pull.

This gives a general indication as to what is happening during the brewing cycle. The only time when the

gauge will display any useful information is when the brewing process is underway. At all other times,

even when the pump is reﬁlling the boiler, this gauge is not displaying any useful information and should

be ignored. About 9 BAR is a good place to be brewing as you get started. Each division is .5 BAR.

Important: the brew pressure gauge displays useful details only during the brew cycle, giving no further

information about brewing temperature. The only way to know brewing temperature is to measure water

coming our of the group through a thermometer ( even a digital one) sold by your retailer.

5. First use of machine

For this ﬁrst use of the Vibiemme Domobar, once the pressure is above about 0.5 you should ﬂush the

boiler to be sure that the machine is working properly. Place a suitable container (like a heat-resistant

glass measuring cup or stainless steel steaming pitcher) under the hot water spout and carefully open

the hot water valve. Water should pour out and the pump should start. Pump out about 6 ounces and

then close the hot water valve. Repeat this two or three times over the next ﬁve or ten minutes, and then

check the reservoir level.

WARNING: The water dispensed as described above is hot enough to cause serious burns. Use

caution whenever dispensing or disposing water.

After an additional ﬁve or ten minutes of warm-up time, test the steam function. Place a vessel under the

steam wand and slowly open the Steam Valve. Steam should come from the Steam Wand and the

boiler pressure should drop slightly. After a few seconds, close the Steam Valve. It is normal for some

water to spurt out of the Steam/Water Wand when the Steam Valve is ﬁrst opened after it has been

closed for some time.

WARNING: Steam can easily cause deep and nasty burns. The metal Steam Wand gets very hot.

Always move the Steam Wand by holding the rubber sleeve and take great care whenever using

the steam function.

When using the Steam Wand, the pump may occasionally operate on its own. The steam comes off the

top of the main boiler where it is “stored” all the time, and the pump will only run when the water level

drops to a point determined by the depth of the water-level sensing wire.

Now it’s time to wait!

We mentioned in the other manual that patience is a virtue when it comes to making espresso and here

is our ﬁrst example. The boiler, that huge brass grouphead, the portaﬁlter, and all the related metal parts

need to come up to temperature. As the boiler comes up to temperature, hot water will circulate through

the system, helping to speed things up, but plan on waiting about twenty or thirty minutes before the

machine is ready for use.

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