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3 - How it Works
We feel that before you begin using your new Vibiemme Domobar Super espresso machine that it would
be a good idea to give you a basic understanding on its inner workings. This knowledge will give you a better
understanding of the rest of this guide.
NOTE: This is a diagrammatic representation of the major components of your Domobar Super. It does
not accurately represent the physical layout or actual locations of the various parts of a Domobar Super. It is
designed to only illustrate the workings of the machine.
The large rectangle represents the case of the Domobar Super. It houses all the working elements of the ma-
chine as shown above. The E-61 grouphead, as shown, is on the outside of the case.
When you turn the power switch to Position I, the electronics check to see if the boiler is filled to the proper
level. The water level sensor is a special wire that is passed through the outside of the boiler. It sends a small
electrical current through the water to the boilers inside surface. If the sensing wire is not touching the water it
cannot send the electricity through the water. An electrical wire is connected to the end of the sensor to the control
unit. If the water level is too low the control circuit turns the pump on and at the same time a valve opens to direct
the water into the boiler. How far this sensor is pushed into the boiler determines the level of water in the boiler.
Pushing it in further maintains a lower water level. Pulling it out creates a higher water level in the boiler. Among
other things, the water level determines the amount of steam stored in the boiler and insures that there is enough
water to cover the heating element as well as immersing the Heat Exchanger.
Inside the case the boiler is the largest single component. In normal operation the boiler will be about one-
half to two-thirds filled with water. Immersed near the bottom of the boiler is the heating element. When you turn
the power switch to Position II, the heating element is energized and the water begins to heat, some of the water
turns to steam, and the pressure inside this closed vessel begins to increase.
To control the temperature of that water there is a device called a pressurestat- a pressure-controlled switch.
When the pressure in the boiler reaches a certain level the pressurestat turns off the element. This cycling can be
seen through the activity of the Heating Element Indicator Lamp on the front panel.
7


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