La Marzocco Linea AV Operating Manual

English
®
Operating Manual
MODEL. “LINEA” - “FB 70” / VERSION. “EE” - “AV”
Chapters
1. General warnings and safety specifications
pag. 3
2. Definition of available models
pag. 4
3. Installation
pag. 7
4. Operating the machine and preparing coffee
pag. 9
5. Preparing other hot drinks
pag. 12
6. Maintenance and weekly cleaning operations
pag. 13
7. De-commissioning and demolition
pag.14
8. History and use of the La Marzocco
coffee machines
pag. 15
La Marzocco
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s.r.l.
Via Bolognese 68 Pian Di San Bartolo 50010 Firenze, Italy
t: +39. 055.401.390 f: +39.055.401.349
e-mail: [email protected] - www.lamarzocco.com
1) This operating manual is an integral and essential part of the product and must be supplied to
users. Users are asked to read the enclosed warnings
carefully, as they provide valuable information concerning safety during installation, operation and
maintenance.
This manual must be kept in a safe place and be available for consultation to new and experienced users
alike.
2) Make sure of the product’s integrity by inspecting
the packaging, making sure it presents no signs of damage which might have affected the enclosed machine.
3) Check the machine’s integrity after having carefully removed the packaging.
Notes 2 and 3:
in case of doubt, do not go on any further and contact
your dealer or retailer immediately. They will send out
specialized personnel authorized to do work on the
machine.
4) Packaging (boxes, plastic bags, foam parts and
whatever else) must not be left around within easy reach
of children, due to the potential danger it represents, nor
be discarded in the environment.
5) Check to see that data on the rating plate correspond to those of the mains electrical supply which the
machine will be hooked up to.
The installation must be done according to current
regulations and to the manufacturer’s instructions, and
must be performed by qualified and authorized personnel.
Incorrect installation may be cause for injury/damages to people, animals or objects, for which the manufacturer shall not be held responsible.
Safe electrical operation of this device will be
achieved only when the connection to the power outlet
has been completed correctly and in observance of current safety regulations, and particularly by grounding the
unit very carefully. Make sure grounding has been done
correctly as it represents a fundamental safety requirement and, in case of doubt, do not hesitate to have qualified personnel check such connection.
Furthermore, you must ensure that the capacity of
the available electrical system is suitable for the maximum power consumption indicated on the rating plate;
make sure also that electrical cables are of a suitable size.
We do not recommend using adapters, multiple
plugs and/or extension cords. If you cannot avoid using
them, make sure that they are exclusively of the kind
which conforms to current safety regulations, being
careful not to exceed the power and current ratings indicated on such adapters and extension cords.
6) This device must be used exclusively for the functions it has been designed and built for. Any other application is inappropriate and dangerous. The manufacturer shall not be held responsible for any damages
caused by improper and irrational use.
7) Using any electrical device requires that certain
fundamental rules be observed.
In particular:
- do not touch the device while having wet or humid
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hands and feet;
- do not use the device while having no shoes on your
feet;
- do not use extension cords in bath or shower rooms;
- do not unplug the device from the power outlet by
pulling on the power supply cable;
- do not expose the device to atmospheric agents (rain,
sun, etc.);
- do not allow children or untrained people to use this
device;
- do not clean the control panel with a wet cloth since it
is not watertight.
8) Before carrying out any maintenance and/or cleaning operations, turn the main switch, which is located on
the machine, to the “0” position, and disconnect the
machine from the electrical network by unplugging the
cord or by switching off the relative circuit breaker. For
any cleaning operation, follow exclusively the instructions contained in this manual.
9) In case the machine is operating in a faulty manner or breaks down, disconnect it from the electrical network (as described in the preceding point) and close the
water supply tap. Do not attempt to repair it, and contact qualified and authorized professionals. Any repairs
must be performed exclusively by the manufacturer or
by an authorized centre using only original parts. Non
compliance with the above forfeits the warranty and
could compromise the safe operation of the machine.
10) You should plan to make use of an omnipolar
connector during installation, as required by current
safety regulations, complete with fuses suitable to bear
the power of the machine being connected.
11) In order to avoid dangerous overheating problems, it is recommended that the power supply cable be
fully unfurled.
12) Do not obstruct air intake and exhaust grilles and,
in particular, do not cover the cup warmer tray with
cloths or other items.
13) The machine’s power supply cable must not be
replaced by users, as also specified on the rating plate
located near the outlet of such cable, on the body. In
case the cable gets damaged, shut off the machine (as
described in point 8) and close off the water supply; to
replace it, contact qualified professionals exclusively.
CAUTION:
As already mentioned in the preceding notes, the
manufacturer shall not be held responsible for damages to objects, animals and/or people whenever the
machine has not been installed according to the
instructions contained in this manual, and is not used
to do what it was designed for (i.e. preparing coffee
and hot drinks).
3
English
1. General Warnings and Safety Specifications
2. Definition of Available Models
This operating manual refers exclusively to the following
models, of our own manufacture:
Mod. EE - Mod. AV with 1, 2, 3 e 4 groups
English
Everything set out in this operating manual is also valid
for the “FB70” series. The only differences are the external dimension of the machine.
COMMON DIMENSIONS AND WEIGHTS FOR THE
LINEA SERIES
COMMON DIMENSIONS AND WEIGHTS FOR
THE FB70 SERIES
2 gr.
3 gr.
4 gr.
A [mm]
450
450
450
520
B [mm]
610
610
610
930
1170
C [mm]
840
1080
1330
74
92
WEIGHT [kg]
58
74
92
1 gr.
2 gr.
3 gr.
4 gr.
A [mm]
420
420
420
420
B [mm]
520
520
520
C [mm]
490
690
WEIGHT [kg]
44
58
fig. 1 - Model EE with 1, 2, 3 and 4 groups
Legend
1) Main switch
2) Water level sight glass
3) Pressure gauge
4) Coffee groups
5) Coffee brewing control panel
6) Cup warmer switch
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7) Hot water switch
8) Emergency button for loading water
9) Steam nozzle
10) Steam knob
11) Hot water nozzle
General description
1.
2.
3.
4.
5.
6.
Water boiler (produces steam and hot water);
Coffee (“saturation”) boiler;
Brewing groups;
Cover;
Motor pump;
Water purifier.
Description of the various parts
1. Water Boiler
It consists of a cylindrical tank, of varying length according 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
2
3
4
group
groups
groups
groups
3,5 litres
7 litres
11 litres
15 litres
1300
2000
3000
3800
Watts
Watts
Watts
Watts
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 provide good aesthetics, to lower ergonometric costs for the
operator and to reduce the chance of damage to a minimum.
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 boiler 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.
Covers are installed at either end of the cylindrical tank
and on one of them there is a housing for the water heating 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 following, you will find a list of effective volumes and power
ratings according to the number of groups installed:
1
2
3
4
group
groups
groups
groups
1.8 litres
1000
3.4 litres
1400
5.0 litres
1600
3.4 + 3.4 litres 1400
(2 boilers installed)
Watts
Watts
Watts
+ 1400 Watts
It consists of a cylindrical tank, of varying length according 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 heating 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.
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5
English
The model EE machine is built in the 1, 2, 3, and 4 group
versions and is essentially composed of the following
parts:
English
fig. 2 - MODEL AV with 1, 2, 3 and 4 groups
Legend
1. Main switch
2. Water level sight glass
3. Pressure gauge
4. Coffee groups
5. Coffee dispensing control panel
6. Cup warmer switch
7. Hot water switch
8. Emergency button for loading water
9. Steam nozzle
10. Steam knob
11. Hot water nozzle
12. Key operated switch to enable dosage programming
Not available in Version 3D5
13. Manual brew switch
General Description
The model AV machine is built in the 1, 2, 3, and 4 group
versions and is essentially composed of the same parts as
model EE.
This model differs from model EE in that it allows the operator to choose four different quantities of water for brewing coffee. Each group, therefore, is provided with a 5
button control panel, allowing a combination of:
- a quantity of water for one normal (short) coffee;
- a quantity of water for one tall coffee;
- a quantity of water for two normal coffees;
- a quantity of water for two tall coffees.
The fifth button is used to program the other ones, as we
shall see later, and as an on-off switch for continuous brewing.
Coffee brewing control panel for the AV model
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English
3. Installation
WATER PURIFIER
MOTOR PUMP
fig. 3
Legend
380 Volt cable
220 Volt cable
Water tubing
Water supply tubing
Drain tubing
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7
MODELS “EE” and “AV”
1, 2, 3 and 4 groups
English
Check the package to make sure that the following parts
are included, further to the machine complete with all its
groups:
- a number of 1-dose and 2-dose portafilters corresponding to the number of groups;
- replacement 1-dose and 2-dose filters, one of each;
- 1 tamper;
- 1 blind filter;
- 2 packets of detergent, for the groups;
- 3 flexible metal tubes for water connections;
- 1,5 mt of reinforced plastic tubing for drainage;
- 1 hose clamp.
In order to proceed with installation, it is necessary that
the following be available:
1. Pipes carrying drinking water with a 3/8” gas-type
end tap;
2. Three-phase, 380V - 50 Hz electrical connection with
neutral + ground, near the bench on which the machine
is installed and terminating in a suitable protected fivepole socket equipped with an approved interlock switch;
or a single phase 220V - 50 Hz electrical connection with
ground, protected socket and approved interlock switch
(according to which machine has been purchased);
3. Drain tubing.
N.B.
The drinking water stopcock and the terminal switches
for the electrical system will need to be located in the
most convenient position for the operator to be able to
get to them easily and quickly.
INSTALLATION - see fig. 3 (pag.7)
CONNECTION TO THE WATER SYSTEM
Connect the terminal, part 14 of the machine, with a
high pressure rubber tube (in order to eliminate vibrations) to the motor pump’s water supply fitting (part 15)
and then connect the motor pump inlet to the purifier’s
outlet (part 16) and lastly the water purifier inlet (part
17) to the drinking water tubing by means of the tap
(part 18). If, in order to complete the above connections,
you need to cut (with a hacksaw), file, or weld the pipes,
it is necessary to run some water through the piping
before connecting the motor pump and the machine, in
order to eliminate any residual particles which could otherwise get stuck in taps or valves thus preventing them
from working properly.
N.B. The pump is volumetric and has been designed to
be used exclusively with cold water. Make sure that
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water is always present while the pump is operating,
otherwise its reliability may be compromised.
ELECTRICAL CONNECTIONS
Two synthetic rubber cables protrude from the machine:
1) 5-core cable with 2.5 mm2 cross section for all 380V
versions
or
3-core cable with 2.5 mm2 or 4 mm2 or 10 mm2 cross
section for 220V machines,
according to the power of the machine;
2) 3-core cable with 1.5 mm2 cross section for all versions.
The first cable, with larger diameter, is required for connecting to mains power through a five-pole or 220V single phase plug. The second cable is required for the
motor pump, running at 220 V and 50 Hz, connected via
male-female connectors (part 25).
Before making any connections make sure that the 2
cable grommets are firmly secured to the body of the
machine in order to prevent people from inadvertently
tugging away the cable.
The first cable must be connected to mains power downstream of a magneto-thermal switch and by means of a
protected plug for omnipolar switches equipped with
20A fuses suitable to bear the power of the coffee machine.
DRAIN CONNECTION
The drain wells of the machine (part 19), are to be connected by means of the special plastic tube to the café’s
drain piping (part 13). In case such piping is not available, drained liquids may be collected in a suitable bucket and any necessary drain pipe extensions shall be made
using steel-lined PVC tubing and suitable hose clamps.
WARNING
The manufacturer declines any responsibility for any
event leading to liability suits whenever GROUNDING has
NOT BEEN COMPLETED according to current regulations,
or other electrical parts have been connected improperly.
4. Operating the Machine and Preparing Coffee
English
FILTER
FILTER HOLDER
fig. 4 - Filter Holder (see part. 4, fig. 1 or 2)
Once installation has been completed, you can proceed
to hook up the filter holders (Fig. 4), together with their
filters, to the bottom of the groups by rotating them
from left to right; before operating the various switches
and thus powering up the heater elements, fill up the
boiler tanks with water, as follows:
1. COFFEE BOILER
The water flows inside the coffee boiler directly, as soon
as the water system and purifier taps are opened. Since
the inflowing water will compress the air in the boiler, it
will be necessary, in order to completely “saturate” the
boiler-groups assembly, to remove the group cover plate
(part 20 Fig. 3) and unscrew the small bolt (part 21) a little way so as to allow air to escape until a few drops of
water leak out, at which point you should repeat such
operation for each group and then tighten the small
bolts again and reinstall the cover plate.
2) WATER BOILER
By turning the main switch (part 1) to position “1”, the
automatic level gauge will be switched on which, by
activating the solenoid valve and the motor pump (part
15), will fill the water boiler up to a predetermined level
selected by adjusting the probe inside the boiler itself.
N.B.
It may happen that the air inside the boiler builds up
pressure (which may be detected through the pressure
gauge - part 3, Fig 1 or 2) when the water is allowed to
flow in; this “false” pressure must be eliminated by opening the vapourizing tap (part 10, Fig. 1 or 2).
Once you have completed these operations, turn the
main switch (part 1) to position “2” and wait for the boilers to reach operating temperature and pressure (which
takes from 20 to 35 minutes, depending on the type of
machine), which will be subsequently maintained at a
constant value automatically.
During this time, it may happen that the pointer of the
lower scale on the pressure gauge (part 3, Fig. 1 or 2)
reach as high as 14-15 bar; this may occur any time that,
while activating the groups, the motor pump forces cold
water into the coffee boiler at a pressure of 8-9 bar and,
simultaneously, the thermostat regulating the temperature of the boiler itself switches on the heating elements
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in order to bring the water contained in such boiler up
to operating temperature. However, in this case it is necessary to adjust the 19A expansion valve (Fig. 3) in such
a way that the pressure may never exceed 11 bar.
For model EE - fig. 1
Once you have ensured that the filter holders (Fig. 4) are
properly tightened, you should press the brewing buttons (part 5) 2 or 3 times and hold them pressed a few
seconds each time, in order to pre-heat the holders. You
may then remove the one that you want to make coffee
with (1 or 2 cups), together with its own filter, and proceed to place some ground coffee in the filter itself: 1
dose (approximately 6 g) for the small filter, 2 doses (2
coffees) for the larger filter. Press down on the ground
coffee with the supplied tamper and hook the filter holder up again to the bottom of the group and then press
the switch (part 5) thus allowing coffee to be brewed;
COFFEE BREWING BUTTON (part 5)
when you have obtained the right amount of coffee,
press the switch again (part 5), at which point the
machine discharges the pressure built up in the filter
holder. The holder may then be removed to proceed
with making the next cup of coffee, if so desired.
CAUTION:
Do not remove the filter holder when its relative group is
brewing hot liquids. Such action may be cause for severe
burns.
9
For model AV - fig. 2
It is essential to program the quantity of water delivered
by performing the following operations with the utmost
care. In case of doubt or difficulties, please contact our
technical service.
English
COFFEE BREWING CONTROL PANEL part. 5 fig 2
Introduction
The coffee metering system is based on the amount of
water which will be delivered onto the ground coffee,
already set in the filter and the filter holder, which is
measured through a water volume control system, which
is located above the group assembly flange, which connects the group itself to the boiler. Inside each counter
there is a paddle wheel (which we shall call wheel for
simplicity) which rotates as water flows by.
The sequence of the water cycle is as follows:
group - counter
counter - solenoid valve
solenoid valve - diffuser
diffuser - coffee brewing spout
The wheel is designed in such a way as to rotate freely
when water is flowing by; it sends 2 signals, every complete rotation, to the electronic module which processes
them and activates the solenoid valve relay of the corresponding group, as well as the motor pump relay.
Such electronic module also processes the signal sent by
the boiler’s level gauge and consequently activates the
relative solenoid valve relay of the same motor pump.
PROCEDURE FOR PROGRAMMING DOSES - fig. 2
1. activate the DAN3 switch (part 12) by using the special key supplied with the standard version;
2. press the 5th button (the one with the spiral symbol,
also used for continuous brewing) of the first control
panel from the left; at this point, the LEDs of all the buttons will light up which means that they are ready to be
programmed;
Variation in programming for the 3D/5 version
The DAN3 key (part 12) is not required for this version,
and in order to program the doses it is sufficient to press
the button with the spiral symbol for more than 4 seconds. You can then follow the same operations as for the
standard version, which are described in the following.
N.B.
The LEDs stay on for 5 seconds after which, if no button
has been pressed, they turn off; you must then repeat
the above-mentioned procedure to turn them on again
and to prepare the electronic module for programming;
10
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3. press the first button within 5 seconds and press it
again once you have obtained the desired amount of
coffee; at this point, the LEDs will turn off and this button will remain programmed as for the dose brewed previously;
4. repeat steps 2, 3 and 4 for the other three buttons;
any time a button has been programmed, by pressing
the button with the spiral again, the LED of the programmed button(s) will remain switched off.
5. once you have programmed the first 4 buttons of the
first control panel from the left, turn the DAN3 switch
(part 12) off; the dosage programs set according to the
above will be stored in memory and the 5th button (the
one with the spiral) will return to its function as a continuous brewing on/off button.
N.B.
The programs for the first group from the left will
become the default programs for the remaining groups,
although you may wish to program these groups differently in which case you need to follow steps 1 to 5 for
the remaining control panels. The leftmost control panel
must be programmed first; indeed, if you were to program this last, all its settings would be automatically
transferred to the other groups.
If you decide to change any programs, you will have to
wait for a few minutes. In fact, you will not be able to set
any new program until the LEDs have turned on again,
after having activated the DAN3 switch (part 12) and
pressed the 5th button with the spiral symbol.
Each button also works as a switch and, therefore, you
may stop coffee brewing at any time, whenever you
have obtained the desired quantity, by pressing again
the same button you used to start such action.
Fault warnings
If the wheel does not send any signals to the electronic
module for more than 3-4 seconds, the LED of the button which has been pressed will start flashing. This
means that:
A) water is not flowing over the wheel and is therefore
not reaching the coffee groups, which may be due to:
1. the ground coffee being too fine meaning that the
coffee gets brewed too slowly (drop by drop or almost
so) and therefore the wheel cannot measure the water
flow within the factory-set time of the electronic module.
2. insufficient water flow past the groups (i.e. onto the
coffee powder) probably due to a combination of one or
more of the following occurrences:
- partial blockage in one of the pipes;
- a malfunctioning motor pump;
- a malfunctioning solenoid valve;
- partial blockage of the filter of the diffuser.
B) there are calcium deposits inside the water flow
counter which prevent the wheel from turning properly.
C) the wheel itself and the header (top part) of the
counter, which contains said wheel in the bottom part,
may be faulty.
You may press the same button again in order to terminate coffee brewing before its programmed stop. If you
need an unusual amount of coffee, you may press the
button with the spiral symbol and press it again once
you have obtained the desired quantity.
new dose of ground coffee in the filter.
The size of the coffee granules is extremely important in
preparing a good cup of coffee, other than the type of
coffee mix used, quite obviously. The ideal grinding can
be determined by making various coffees using the
amount of ground coffee that you would normally use
for each cup (we recommend at least 6 g).
The best grinding is that which allows coffee to flow out
from the filter holder spouts neither too slowly, drop by
drop, nor too quickly.
IMPORTANT
The temperature of the water in the coffee boiler, and
therefore of the groups, may eventually be raised or
decreased by means of its own thermostat (part 22,
Fig.3); by turning the adjusting screw a full 360° clockwise, the temperature will increase by approx. 8°C, and
vice versa. The final adjustment should be made during
tuning-up, once the machine has been permanently
installed, and should not exceed a quarter of a turn (90°)
of the screw clockwise or counter-clockwise, which corresponds to a change in temperature of approximately
2°C. The pressure of the water on the coffee during the
brewing is very important. For this reason it is important
to set the by-pass on the pump at 9 bar. This value
changes if there are variations on the incoming pressure
from your local water system. If there are variations,
make the necessary technical adjustments on the system
in order to eliminate them.
Once the coffee has been completely brewed, the pressure in the filter holder is discharged automatically, and
the latter may then be removed in order to repeat the
operation, as requested.
GENERAL NOTIONS FOR PREPARING COFFEE
When the machine has reached its operating pressure,
1.5 bar which may be checked by looking at the upper
scale in the pressure gauge (part 3 Fig. 1 or 2), and its
operating temperature at the same time, with the
body/group already at infusion temperature, the filter
holder and filter must be heated more since they are at
the lowest position of the group itself, and they are partially isolated from the same due to the rubber gasket
between them. This operation may be carried out by
activating the switches (part 5, Fig. 1 or 2) and keeping
them in the brewing position for 10-15 seconds, at
which point they must be turned off and you must wait
for 2-3 more minutes.
During this time, it may happen that the pointer of the
lower scale of the pressure gauge (part 3, Fig. 1 or 2)
reach as high as 14-15 bar; this may occur any time that,
while activating the groups, the motor pump forces cold
water into the coffee boiler at a pressure of 8-9 bar and,
simultaneously, the thermostat regulating the temperature of the boiler itself switches on the heating elements
in order to bring the water contained in such boiler up
to operating temperature. However, in this case it is necessary to adjust the 19A expansion valve (Fig. 3) in such
a way that the pressure may never exceed 11 bar.
It is important to remember that coffee left over in the
filters must be removed only when you need to prepare
another cup, and only at that time should you place a
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11
English
Coffee brewing
Once you have made sure that the filter holders (Fig. 4
and part 4) have been properly tightened, you should
press the brewing buttons (part 5) 2 or 3 times and hold
them pressed a few seconds each time, in order to preheat the holders. You may then remove the one that you
want to make coffee with (1 or 2 cups), together with its
own filter, and proceed to place some ground coffee in
the filter itself: 1 dose (approximately 6 g) for the small
filter, 2 doses (2 coffees) for the larger filter. Press down
on the ground coffee with the supplied tamper and
tighten the filter holder again onto the bottom of the
group and then press one of the buttons with the symbols for 1 or 2 cups, strong (short) or long.
5. Preparing other hot drinks
HOT DRINKS
English
Dip one of the 2 nozzles (part 9, Fig. 1 or 2) which are
connected to the steam tap, into the liquid to be heated, turn the knob (part 10, Fig. 1 or 2) gradually until
steam comes out at the end of the nozzle (1).
The steam will transfer heat to the liquid raising its temperature up to boiling point.
Be careful not to allow liquid to overflow in order to
avoid severe burns.
In order to prepare milk for making cappuccino with the
right amount of foam, go through the following steps:
- Place the container half-full of milk under the steam
nozzle, open the tap and bring the temperature of the
milk almost up to boiling point.
- Lower the container so as to bring the nozzle end to a
point just below the surface of the milk; at this point,
move the container up and down just enough to dip the
nozzle end in and out of the milk until you get the right
amount of foam.
You can then pour this milk into a cup containing warm
espresso and you will end up with a fresh cup of cappuccino.
PREPARING TEA - CHAMOMILE
AND OTHER DRINKS
You can get hot water by using the fixed nozzle (part 11),
located between the group furthest to the right and the steam
nozzle (part 9), and pressing the button (part 7, Fig. 1 or 2)
which commands hot water delivery; you can then add
the bag containing tea, chamomile, etc. The purified
water delivered by the nozzle will usually make the drink
darker in colour.
If you wish to have a drink with a lighter colour, just take
some cold water from an ordinary water tap and heat it
up by using the steam nozzle (part 9) and then add the
tea bag or other bag.
N.B.
In order to prevent part of the liquid to be heated from being sucked back into the boiler (due to a possible temporary decompression inside the boiler tank) which would cause, after a few days, both the steam and the liquid delivered by nozzle part 9 and nozzle part 11 respectively to smell bad, we recommend that you de-vapourize the machine
once or twice for just a few seconds, which consists of quickly opening and closing the tap (part 10) with the nozzle
(part 9) not dipped in the liquid before starting such operation.
Furthermore, once you have immersed the steam wand into the liquid to be steamed in the pitcher, open the steam
tap immediately. Once the liquid has been heated, follow this procedure:
- lower the steam pressure
- remove the pitcher
- close the steam tap
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6. Maintenance and weekly cleaning operations
Cleaning groups and drain wells
- Put a tablespoon of detergent powder for coffee
machines into the blind filter, supplied with the machine,
and tighten it onto the group you want to clean by using
a normal filter holder.
- Press the brewing button for said group, as if you were
making a regular cup of coffee.
- Stop the water after about 15-20 seconds.
- Start and stop the group several times until you notice
clear water coming down, instead of soapy water, when
you remove the filter holder.
- Rinse the group using a normal filter, by running hot
water through it several times.
Caution:
Never remove the filter holder when water is being delivered. This operation can be extremely dangerous since
the high pressure built-up inside the blind filter would
spray out hot and slightly caustic water, which may
cause severe burns.
Cleaning filters and filter holders
- Put 2 or 3 teaspoons of detergent powder for coffee
machines in about 1/2 a litre of water inside a heat-resistant container and boil.
- Dip filters and metallic part of portafilters in the boiled
solution and leave them fully submerged for about 30
minutes.
- Rinse thoroughly with clean water and run hot water
through one group several times with the filters in place.
- Make one cup of coffee in order to remove any
unpleasant savour.
Cleaning the drain collector
Remove the drain tray grill every night, pull out the
water drain collector and clean it thoroughly. Also
inspect and clean the drain well (part 19) at least twice a
week, and remove any leftover grounds with a tablespoon.
Cleaning the body
Wipe the stainless steel surfaces with a soft cloth in the
direction of the glazing marks, if any. Do not use any
alcohol or solvents whatsoever on painted or imprinted
parts in order not to damage them.
Cleaning the hot water and steam nozzles
Steam nozzles must be cleaned immediately after use
with a damp cloth and by producing a short burst of
steam so as to prevent the formation of deposits inside
the nozzles themselves, which may alter the savour of
other drinks to be heated.
Cleaning the diffusion screens (infusion filter)
Due to filter holder discharge operations (subsequent to
coffee brewing), a certain amount of coffee grounds may
slowly build-up on and obstruct, even partially, the infusion filter. To clean it up, you must first remove it by
unscrewing the retainer screw, then proceed to hold said
filter with a pair of pliers and burn off the wood particles
contained in the coffee grounds by using a gas stove or
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the flame from a cotton ball soaked in ethyl alcohol. In
the latter case, keep well clear of the alcohol container when lighting the cotton ball and do not add any
alcohol at all while the cotton is burning.
English
The machine must not be dipped in, nor splashed
with, water in order to clean it. For cleaning operations, please follow the instructions listed below very
carefully.
SCREW
DIFFUSER
DIFFUSER - fig. 5
Motor Pump
It is of the positive-displacement type and can develop a
pressure of 14 bar. The operating pressure is 8-9 bar and
is preset in-factory during testing; however, such pressure may vary from place to place since the pump
“absorbs” the pressure in the service water pipes to
which it must be connected. You can always check the
pressure itself by looking at the lower scale on the pressure gauge (part 3, Fig. 1 or 2) whenever you are brewing coffee, and you can increase such pressure, as
required, by turning the by-pass screw (below the plug
located on the side to which the pump power supply is
connected) clockwise, or reduce it by turning the screw
counter-clockwise. Adjust pressure only when at least
one group is brewing coffee.
IMPORTANT
When you activate the motor
pump by pressing the specific
button (part 8, Fig. 1 or 2)
you also give power directly to
the coffee boiler. If you activate the motor pump when the machine is cold, a start-up
pressure of 8-9 bar will develop; thus, once the heating elements start working and the water temperature increases,
the liquid will expand increasing the start-up pressure by
about 3 bar, for a total pressure of 11 bar. Once operating
pressure is reached, the expansion (safety) valve (part 19A)
should start working by discharging a few drops of water, in
order to prevent such pressure from exceeding 11 bar.
In case the pressure exceeds 11 bar, you must proceed to
adjust the valve by unscrewing the cap slightly. If this is not
sufficient, remove the valve and clear away any calcium
deposits. This remedy is valid also in case the valve remains
open in the drain position (i.e. the pressure cannot increase
to 8 bar approx.).
Purifier
It is of the “ion exchange” resin type. Such resins must
be regenerated weekly with ordinary table salt, as indicated on the label affixed to the purifier. An efficient purifier results in the machine working properly.
Using the machine without having adequately regenerated the purifier (at least once a week for supply water
having a hardness of between 9 and 13 French degrees)
may cause the machine to work improperly. The manufacturer declines any responsibility in this case.
13
7. De-commissioning and demolition
Start by setting the main switch (part 1) to the “0” position.
English
Disconnecting from the power outlet
In case the machine is connected through the plug (part
24), make sure that the switch (part 23) is also in the Off
position before disconnecting. Disconnect the motor
pump (part 15) by pulling out its special plug (part 25).
Disconnecting from the water system
Shut off the water supply by closing the specific tap
located upstream of the purifier inlet. Disconnect the
water pipe at the purifier (part 17) inlet, which is located just downstream of the special tap (part 18), which
has been closed in advance.
WATER PURIFIER
Proceed to remove the drain well piping (part 19, Fig.
1).
MOTOR PUMP
fig. 3 (see also pag. 7)
At this point, the machine may be removed from the
bar, being very careful not to drop it or squash your fingers.
The machine is made out of various materials and therefore, if you do not intend to put it back in service, it must
be taken to a special disposal company which will select
the materials which can be recycled and discard the others.
Current regulations make it illegal to discard such
machine by leaving it on public grounds or on any private property.
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La Marzocco has been producing espresso coffee
machines for use in cafés since 1927.
In February of 1939, when machines being manufactured were exclusively of the vertical boiler type, “La
Marzocco” designed and built the first horizontal boiler
machines, for which it obtained a “patent”.
Second World War brought an end to production of coffee machines, and it prevented the Bambi brothers from
maintaining the patent obtained and therefore, at the
end of the war, all the coffee machine producers began
manufacturing again and they adopted the “horizontal”
boiler, which was more practical and suitable for new
demands and which is still in use now.
Throughout time, various machines have been designed
and built: of the type operating on “Water/Steam” and
on the principle of “Hydrocompression”, and of the lever
operated, air and steam type; semi-automatic and automatic, with mechanical and electrical actuators, up until
current production which consists of machines allowing
continuous “brewing” operation.
CHARACTERISTICS PARTICULAR
TO THE LA MARZOCCO MACHINES
The great majority of the espresso coffee machines being
built today, of almost any brand, are of the “continuous
brewing” type, whose basic concept is to use the same
water in the tubing, directly to brew coffee by increasing
its pressure mechanically and heating it in advance.
In any case, a good cup of coffee is the result of 4 highly
interdependent components, to such extent that if only
one of them is not quite in perfect harmony with the
others, the resulting cup of coffee will turn out not quite
as pleasant in taste.
The 4 basic components are:
1) coffee bean mix;
2) water;
3) coffee grinder;
4) espresso machine.
1) Coffee Mix
Independently of the various qualities of coffee that
make it up, the type of toasting, etc., the freshness of the
coffee beans and the way they are preserved is very
important.
For coffee beans to be used on espresso machines, it’s a
good rule of thumb to wait at least 8-10 days after toasting, so that the beans may re-absorb part of the humidity they lost during the toasting process itself, and to
use coffee beans within 3-4 days of opening their container.
2) Water
Within the limits imposed by the type supplied locally,
water should be free of bad savours and “softened”
using a suitable water softener in order to avoid calcium
build-up; in any case, hardness should not exceed 9°F. If
water tastes like chlorine it is recommended that you use
an active carbon filter.
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3) Coffee Grinder
It must allow you to grind coffee beans in a wide variety
of granule sizes, in the most uniform manner possible
and, once you have established the amount of ground
coffee required for each cup, the grinder must guarantee
a constant amount from dose to dose. It is best to grind
coffee from time to time, trying not to leave any ground
coffee in the grinder overnight and during days off.
4) Espresso machine
Among other things, the espresso machine must guarantee the following qualities:
A) the most appropriate water temperature for the type
of coffee mix used, constant in time so as to ensure that
a good cup of coffee may be prepared any time, whether
you have to make several, one after the other, or one
from time to time.
B) a constant water pressure through the brewing group
and the coffee mix.
As far as the “B quality” is concerned, it is usually obtained by means of the same system in all the “continuous
brewing” type machines, that is by using a positive-displacement motor pump, while “quality A” can be obtained with various systems.
The great majority of manufacturers uses systems which
are very similar to one another. The underlying principle
is to heat up the water used for brewing coffee, which
comes directly from the pipes and is pushed by the
motor pump, by running it through coils or cartridges
(small containers) which are located in the boiler. It follows that the latter must be quite large, which entails a
noticeable power consumption, and the temperature
may be controlled exclusively through a manostat, a
device which is specifically designed for controlling pressure and not temperature; indeed, the temperature
changes every time the water/steam ratio in the boiler
changes, and even more so when the latter is replenished with cold water.
It is quite obvious that the coils or cartridges which
supply water to the brewing groups are very sensitive to
the above changes. Furthermore, the heat exchange between the main boiler and the coil varies greatly when, as
time goes on, conduction of heat is reduced due to calcium deposits forming on the inside and outside of coils
or cartridges. In light of the above, and to avoid wastage of electric energy required to keep large quantities of
water at operating temperature/pressure, when only a
small part is utilized, our machines have been designed
with 2 small boilers, of the size which is most suited to
the kind of services they have to offer.
One of them, a “STEAM GENERATOR”, is used to deliver
steam and hot water for various drinks while the other, a
“HOT WATER GENERATOR”, is used for the coffee. The
latter, therefore, produces hot water used exclusively for
brewing coffee, which will flow out, every time the specific group is activated, thanks to the force of the cold
water (actually produced by the positive-displacement
pump). The temperature of such water is controlled by a
THERMOSTAT-like device which is extremely sensitive
and has a differential of ±1° C, adjustable to 1/10 of a
15
English
8. History and use of the “La Marzocco” Coffee Machines
English
degree in order to adapt it to the optimal temperature,
depending on the type of coffee mix being used.
The brewing groups, cast in brass and weighing 3 Kg
each approximately, work like thermal “flywheels”. They
are connected directly to the boiler by means of a large
manifold and are thus an integral part of the boiler itself.
The manifold is shaped in such a way that each group is
located at a greater height than the boiler, so that, just
like in the elements of a thermosiphon, a natural circulation of hot water takes place within each group, at the
same temperature of the boiler and kept constant by the
thermostatic system described previously. The use of
these small boilers, completely independent from one
another, the special manifold and fastening system of the
groups to the boiler as well as the “thermostatic” temperature control, have allowed us to:
1) achieve an excellent thermal equilibrium between the
brewing groups, both at times of discontinuous operation and during peak times;
2) be able to control the temperature of the water running through the brewing groups, independently of the
“pressure” and the level in the small steam boiler, and
therefore to optimize the water temperature itself in
order to obtain the best possible coffee with whatever
coffee mixes are available commercially;
3) save on electrical energy by more than 30%, in many
cases, when compared to other machines.
The “LINEA” series machines are produced in the 1, 2, 3
and 4 group versions, the model “EE” having continuous
brewing operation and the “AV” model positive-displacement automatic brewing.
CONTROL SYSTEMS AND SAFETY DEVICES BUILT INTO
“LA MARZOCCO” COFFEE MACHINES
All models are equipped with:
- automatic level regulator;
- automatic pressure regulator;
- automatic temperature regulator;
- safety devices
Spring operated safety valve;
Manual thermostats.
In both models, coffee is brewed by opening a solenoid
valve, one for each group. For the “EE” model, the quantity of coffee brewed is regulated manually by the operator through a switch, while in the “AV” model the
quantity is regulated automatically in 4 different doses,
which may be programmed at will for each brewing
group. This last model is equipped with control panels,
one located above each group, with 4 buttons which
may be programmed in such a way that by pressing the
1st button you get 1 regular coffee, pressing the 2nd one
you get one tall coffee, pressing the 3rd you get 2 regular coffees and by pressing the 4th one you get 2 tall coffees. The fifth button, which has a spiral sign, allows continuous brewing operation which can be interrupted by
pressing the very same button again.
CONSTRUCTION DETAILS
They consist essentially of 2 small boilers, of which:
1. “C.C.” hot water generator for brewing coffee.
2. “C.V.” steam generator for producing steam and hot
water for making tea and other hot drinks.
16
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1. Description of the Coffee Boiler (C.C.)
Composed of an ASTM A 312 TP 304 ECS stainless steel
tube, with an ext. dia. of 101.6 mm and a thickness of 3 mm.
Heating is accomplished through an immersion-type plated heating element.
Operating temperature 95° C, controlled automatically
by a thermostatic switch, adjusted to 95° C with a differential of ±1° C.
Operating pressure of 9 bar, developed mechanically by
a special positive-displacement pump which is activated
automatically every time coffee is brewed.
Pressure is controlled through a pressure gauge with a
scale from 0 to 15 bar.
Safety device, based on an expansion type mechanical
valve, with counter-acting spring adjusted to 11 bar.
Testing:
a. hydraulic test at 16 bar performed on the ready-to-use
small boilers, at our factory;
b. hot water test at 11-12 bar performed on the readyto-use small boilers, at our factory.
2. Description of the Hot Water Boiler (C.V.)
Composed of an ASTM A 312 TP 304 ECS stainless steel
tube, with an ext. dia. of 154 mm and a thickness of 2
mm.
Heating is accomplished through an immersion-type plated heating element.
-Operating pressure of 1.5 bar, controlled automatically
through a manostat, adjusted so as to open the heating
element supply circuit at 1.5 bar and close it at 1.3 bar.
-The pressure is regulated 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-acting spring adjusted to 1.7 bar.
Testing:
a. hydraulic test at 3 bar performed on the ready-to-use
small boilers, at our factory;
b. hot water test at 1,5 bar performed on the ready-touse small boilers, at our factory.
Capacity and Power Ratings
1. C.C.
- 1 group
- 2 groups
- 3 groups
- 4 groups
1,8 litres
3,4 litres
5,0 litres
2x3,4 litres
1.000 Watt
1.400 Watt
1.600 Watt
2x1.400 Watt
2. C.V.
- 1 group
- 2 groups
- 3 groups
- 4 groups
3,5 litres
7 litres
11 litres
15 litres
1.300
2.000
3.000
3.800
Watt
Watt
Watt
Watt
®
Maintenance log
This maintenance log is an integral part of the OPERATING MANUAL and must be kept together with it. Every operation, with the
exception of small routine operations such as those described in point 6 of the Operating Manual as well as replacing gaskets, filters
and diffusers, shall be carried out by highly qualified technicians who, at the end of any maintenance or repair operation, must fill
in the following log with the date, a short description, stamp and signature.
Whenever the product has not been installed according to the instructions included in the Operating Manual and has not been
subjected to mandatory maintenance operations, or in case such operations have been carried out by unqualified personnel, the
MANUFACTURER shall not be held responsible for damages to things, animals and/or people.
(see reverse for mandatory maintenance operations)
Date
Description of work done
Machine installation including connection to the
water and electrical system
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Stamp and signature
MANDATORY MAINTENANCE AND CHECK-UP OPERATIONS
(These operations are in addition to the Maintenance and Weekly Cleaning Operations as specified in Chapter 6)
The following mainenance and check-up operations should be carried out periodically by a qualified technician.
DESCRIPTION OF OPERATION
Check pressure safety valve
Replace pressure safety valve
Check pressure gauge
Check thermostatic switch
Check for calcareous build-up
Check electrical system
Replace portafilter gaskets
Replace diffusion screens
Replace filters
Check the check-valve
Replace the check-valve
Check steam valve
Rebuild steam valve (with steam valve rebuild kit)
Check pressure switch
Check coffee boiler expansion valve
Replace coffee boiler expansion valve
6 months
1 year
2 years
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
N.B.: THE PERIODIC MAINTENANCE OPERATIONS SPECIFIED ABOVE ARE NOT COVERED BY WARRANTY
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