La Marzocco STRADA EE - Page 6

EN
6
1) General Descripon
The machine is built in 2 and 3 coee
group versions and is essenally
composed of the following parts:
• Steam Boiler (produces steam and hot
water);
• Coee (“saturated”) boiler;
• Brewing groups;
• Exterior Cover;
• Water pump.
2) Descripon of the various parts
• Steam Boiler
The Steam Boiler consists of a cylindrical
tank, of varying length according to the
number of coee groups, which is made
of AISI 300 series stainless steel. Each
unit is subjected to a hydraulic test, at a
pressure of 6 bar, and has an operang
pressure of 1.3-1.5 bar. The following
is a list of eecve volumes and power
rangs according to the number of
groups installed:
2 groups 8,2 liters 3000 Was
3 groups 11,8 liters 4000 Was
Covers are welded at either end of the
cylindrical tank and on one of them
there is a housing for the water heang
element, which allows the steam boiler
to reach operang pressure within
approximately 25 minutes. Operang
pressure is maintained by temperature
probe. The steam boiler has various
ngs used for safety devices, for
supplying hot water and steam, and for
the heang element.
Composed of AISI 300 series stainless
steel tube. Heang is accomplished
through an immersion-type plated
heang element.
• Operang pressure of 1.3-1.5 bar,
controlled automacally through a
pressure switch or a temperature
probe, adjusted to open the heang
element supply circuit at 1.5 bar and
close it at 1.3 bar.
• The pressure is displayed by means of
a pressure gauge with a scale of 0 to 2
bar.
• Safety device, based on an expansion
type mechanical valve, with counter-
acng spring adjusted to 1.8 bar.
• Tesng: hydraulic test at 4.5 bar
performed on ready-to-use small
boilers, at our factory.
• Coee Boiler
The Coee Boiler consists of a cylindrical
tank made of AISI 300 series stainless
steel. One each group (hot water
generator for brewing coee).
Each unit is subject to a hydraulic test, at
a pressure of 18 bar, and has an operang
pressure of 9 bar. The following is a list
of eecve volume and power rangs
according to the number of groups
installed:
2 groups 2 x 1,3 liters 2 x 800 Was
3 groups 3 x 1,3 liters 3 x 800 Was
Covers are installed at either end of
the cylindrical tank and on one of them
there is housing for the water heang
elements. The temperature of the coee
boiler is maintained by an electronic
temperature controller (PID capable)
with an accuracy of 0.2°C. The brewing
groups are installed on the boiler.
Composed of an AISI 300 series stainless
steel tube. Heang is accomplished
through an immersion-type plated
heang element.
• Operang temperature 95°C
(adjustable), controlled automacally
by an electronic temperature
controller with an accuracy of 0.2
°C. Operang pressure of 9 bar,
developed mechanically by a special
posive-displacement pump which
is acvated automacally every me
coee is brewed.
• Pressure is displayed through a
pressure gauge with a scale from 0 to
15 bar.
• Safety device, based on an expansion
type mechanical valve, with
counteracng spring adjusted to 13.5
bar.