Wega EVD Use And Maintenance Manual

TECHNICIANS' manual 17 of 100
2.8.9 DISPENSING group
In this system, the dispensing group (1) is heated by a ther-
mosiphonic circuit (2) connected to the heat exchanger (3).
The same water is used for the coffee dispensing, thus ensur-
ing the same temperature for all coffee servings:
• The solenoid valve and the pump are activated in order to
send cold water to the exchanger (3) through the injector
(4).
• The heating unit water is carried from the exchanger (3)
to the group (4) for dispensing.
• the pump allows the increase of the pressure of the water
owupto8-9barfordispensing.
The injector (4)andowreducer(5) are important compo-
nents for the dispensing group’s operation.
To increase the coffee extraction temperature, remove the
owreducer(5) or replace it with one that has a bigger di-
ameter. To decrease the temperature, replace it with one that
has a smaller diameter.
Water
inlet
Dispensing
coee
DISPENSING IN PROGRESS
5
3
4
2
1
3
IDLE
2.8.10 Safety thermostat
The thermostat prevents any damage occurring to the elec-
trical heating element if there is no water in the heating unit.
The thermostat bulb (7) is located inside a sheath (8) in the
middle of the heating elements. The thermostat contacts (9)
are connected to the electric heating element (10). If the
electricheatingelementisexposedduetoafailuretollthe
heating unit with water, the temperature of the heating el-
ement increases dramatically. At this point, the thermostat
cuts the power supply to the heating element in order to pre-
vent damage occurring.
10
911
7
8
To reset the thermostat, press the centre button
(11). However, before starting the machine up
again, identify what prevented the water from
being fed into the heating unit.
2.8.11 Motor pump
This component feeds the machine
by increasing the water pressure to
0.8-0.9 MPa (8-9 bar) in order to dis-
pense coffee and automatically ll
the heating unit.
2.8.12 Electronic control unit
The electronic control unit is installed on the EVD versions.
Its purpose is to electronically control the cof-
fee dose via the water owing through the
dosing device and to check that the heating
unitisbeinglledwithwater.
Some versions of the control unit are set up
to be connected to the dispensing account-
ingsystemsbymeansofaspecicinterface
device.

Wega EVD Specifications

General

Brand	Wega
Model	EVD
Category	Coffee Maker
Language	English