La Marzocco FB 70 Operating Manual - page 4
General description
The model EE machine is built in the 1, 2, 3, and 4 group
versions and is essentially composed of the following
parts:
1. Water boiler (produces steam and hot water);
2. Coffee (“saturation”) boiler;
3. Brewing groups;
4. Cover;
5. Motor pump;
6. Water purifier.
Description of the various parts
1. Water Boiler
It consists of a cylindrical tank, of varying length accord-
ing to the number of coffee groups, which is made of Aisi
304 stainless steel. Each unit is subjected to a hydraulic
test, at a pressure of 3 bar, and has an operating pressure
of 1.5 bar. In the following, you will find a list of effective
volumes and power ratings according to the number of
groups installed:
1 group
3,5 litres
1300 Watts
2 groups
7 litres
2000 Watts
3 groups
11 litres
3000 Watts
4 groups
15 litres
3800 Watts
Covers are installed at either end of the cylindrical tank
and on one of them there is a housing for the water heat-
ing and vapourizing electrical elements, which allow
reaching operating pressure within 25’ approximately.
Operating pressure is maintained by a manostat. The
water boiler has various fittings used for safety devices,
for supplying hot water and steam, and for the power
supply.
2. Coffee Boiler
Each unit is subjected to a hydraulic test, at a pressure of
16 bar, and has an operating pressure of 9 bar. In the fol-
lowing, you will find a list of effective volumes and power
ratings according to the number of groups installed:
1 group
1.8 litres
1000 Watts
2 groups
3.4 litres
1400 Watts
3 groups
5.0 litres
1600 Watts
4 groups
3.4 + 3.4 litres 1400 + 1400 Watts
(2 boilers installed)
It consists of a cylindrical tank, of varying length accord-
ing to the number of coffee groups, which is made of Aisi
304 stainless steel.
Covers are installed at either end of the cylindrical tank
and on one of them there is a housing for the water heat-
ing and vapourizing electrical elements, regulated by a
precision thermostat with a dT of ± 1°C wich keeps the
water temperature constant. This temperature can be
adjusted to reach optimal temperature according to the
type of coffee blend being used. The groups are installed
on the boiler.
3. Brewing Groups
They consist of a die-cast block made of nickel-plated
brass, on which to install the filter-holder handle used to
hold the ground coffee; the espresso flows from the
block, through a spout, into the cup(s) after the brewing
button has been pressed.
4. Cover
It consists of a painted and stainless sheet steel body. The
structure has been the object of specific studies to pro-
vide good aesthetics, to lower ergonometric costs for the
operator and to reduce the chance of damage to a min-
imum.
5. Motor Pump
The pump, which is of the “positive-displacement” type,
is installed on the water supply tubing and is set-up to
operate anytime the coffee groups are activated, and
through an electric level gauge whenever the water boil-
er needs to be replenished.
6. Water Purifier
It is of the “ion exchange” resin type, for water softening
purposes. Resins must be regenerated weekly according
to the instructions and the diagrams shown on the labels
affixed to the purifiers themselves. See Chapter 6.
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