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Vibiemme Vibiemme Double Domobar version 3 Manual

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Steam Boiler
5
1
Steam And Hot Water Boiler Operation
NOTE: The diagram on this page is not to scale and is designed for general educational purposes
only to illustrate function in a simple-to-understand manner. It does not depict the exact design
features of the espresso machine. It is not be used for technical support nor repair purposes. It is
a diagrammatic illustration to help you gain a better understanding of the basic operation of the
major internal components of this system.
The Vibiemme DD has two boilers. The boiler we will examine here, as the name suggest, supplies steam
and hot water. Steam is dispensed through the steam valve and out the tip of the steam wand located on the
left front of the machine. Hot water is dispensed separately through the right-hand valve.
The numbers in the illustration refer to the numbers in the text below to make it easier to follow along:
1 When you select switch “Position II,” electricity is supplied to the steam boiler’s heating element.
2 The heating element begins to heat the water in the boiler. As the water expands so does the air in the boiler.
If this air was allowed to stay in the boiler it would give a false pressure and a low water level, so this false
pressure needs to be released.
3 The vacuum breaker allows that false pressure to be released early in the heating process. You may hear
a slight hissing sound upon initial warm up, and that sound is this initial steam and hot air being released
from the boiler (indicated by the green arrow). This is channeled through a hose into the drip tray though
the metal pipe on the left-rear wall of the drip tray. As the flow increases this valve snaps shut and pressure
begins to build.
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