Distribution Machine Boiler And Exchangers; Electric Heating; Gas Heating; Combined Gas + Electric Heating - Wega Espresso Coffee Machine Use And Maintenance Manual

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4. Distribution machine BOILER and EXCHANGERS

The boiler is constructed in copper sheet metal (1), to which the heat exchangers are assembled which in turn are connected to the delivery
group. Water for coffee delivery is taken directly from the heat exchanger. During delivery cold water is sent to the inside of the exchanger
by means of the motor pump. Inside the heat exchanger, cold water and the pre-existing hot water are mixed, thus obtaining optimal water
temperature for coffee infusion. The ALE does not have a heat exchanger, therefore water is taken directly from the boiler.

4.1 ELECTRIC HEATING

The water is heated in the boiler by means of an electrical heating element that is immerged in the
water(2).

4.2 GAS HEATING

Gas heating is obtained by supplying the flame of the burner located under the boiler.

4.3 COMBINED GAS + ELECTRIC HEATING

In machines equipped with both systems, it is possible to combine the heating types.

5. COFFEE DELIVERY GROUPS

The delivery group and the heat exchanger are the fundamental components in obtaining
espresso coffee. Specifically, the purpose of the group is to dispense the coffee.

5.1 LEVER GROUP

The lever group uses the boiler pressure and water. This system does not require heat
exchangers.
When the lever (1) is lowered, the spring (2) inside the group is compressed: the piston
(3) raises, allowing water to enter the pre-infusion jacket. When the lever is released,
the piston compresses the water to 8-10 bar, allowing delivery of espresso coffee. The
non-return ball valve (4) keeps water from flowing back into the boiler (5).
Phase 1
Lowering the lever.
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English
espresso coffee machine - instructions for technician
Phase 2
Pre-infusion for
3÷5 seconds.
1
4
5
Phase 3
Release of lever
and delivery
of the coffee.
2
1
2
3