Conti TWIN STAR 2 Guide

TECHNICAL DOCUMENTATION
- 01/2005 - V1.11
SACOME, CONFIDENTIAL Document, it is forbidden to duplicate or communicate this document without previous authorization.

1INTRODUCTION : INSTRUCTIONS AND RECOMMENDATIONS ......................... 2
1.1 Installation instructions........................................................................................ 2
1.2 Warranty ............................................................................................................. 2
1.3 Safety instructions............................................................................................... 2
1.4 Power supply instructions ................................................................................... 2
2TECHNICAL FEATURES......................................................................................... 3
3INSTALLATION........................................................................................................ 4
4ACCESSORIES........................................................................................................ 4
5STARTING OPERATION ......................................................................................... 5
5.1 Bleeding of the coffee boilers.............................................................................. 5
5.2 Filling of the hot water & steam boiler ................................................................. 5
5.3 Next filling ........................................................................................................... 5
6DESCRIPTION OF OPERATING DEVICES............................................................. 6
6.1 Steam tap............................................................................................................ 6
6.2 Hot water tap....................................................................................................... 6
6.3 Filters .................................................................................................................. 6
6.4 Dummy filter........................................................................................................ 6
6.5 Filter- holders ...................................................................................................... 6
6.6 Cappuccinatore (option)...................................................................................... 6
6.7 Steam jet (option)................................................................................................ 6
6.8 Espresso tray ...................................................................................................... 6
6.9 Grinder fork ......................................................................................................... 6
6.10 Water hardness tester...................................................................................... 6
7FUNCTIONING & PROGRAMMING ........................................................................ 7
7.1 Automatic switching ON & OFF .......................................................................... 7
7.2 Programming ...................................................................................................... 8
7.3 Beverage preparation ......................................................................................... 9
7.4 Others functions................................................................................................ 12
7.5 Alarms............................................................................................................... 15
7.6 Heating of the boilers ........................................................................................ 18
7.7 Programming .................................................................................................... 18
8HOW TO MAKE A PEFECT ESPRESSO .............................................................. 29
9MAINTENANCE /SETTINGS.................................................................................. 29
9.1 Daily Maintenance ............................................................................................ 29
9.2 Weekly Maintenance......................................................................................... 29
9.3 Maintenance every 3 month.............................................................................. 29
9.4 Electronic pressure switch ................................................................................ 30
9.5 12 bar Security valve ........................................................................................ 30
9.6 Recommendation.............................................................................................. 30
9.7 Cleaning procedure for the decanteur............................................................... 31
10 DIMENSIONS ...................................................................................................... 33
11 ELECTRIC DESIGNATIONS............................................................................... 34
12 ELECTRIC DRAWING ........................................................................................ 35
12.1 CPU board ..................................................................................................... 35
12.2 Power circuit for “400 V 3NAC” & “230 V 1NAC” ........................................... 38
12.3 Power circuit for “230 V 3AC”........................................................................ 39
12.4 Relays box for “400 V 3NAC” & “230 V 1NAC” .............................................. 40
12.5 Relays box for “230 V 3AC” .......................................................................... 41
13 HYDRAULIC DRAWING ..................................................................................... 42
14 DECLARATION OF COMPLIANCE WITH INTERNATIONAL COMMUNITY
DIRECTIVES ................................................................................................................ 43
1

1 INTRODUCTION : instructions and recommendations
1.1 Installation instructions
- The installation must be carried out by a technician specifically trained by CONTI. The
manufacturer is not responsible for any damages caused due to incorrect installation or
use. The coffee machine must be installed on a solid furniture, supporting its weight
under any circumstances.
- It is necessary to make the machine level to obtain equal coffee portions.
1.2 Warranty
- The life span of the TWIN STAR 2 depends on the correct utilisation of the machine, the
daily cleaning and preventive maintenance.
-The non-respect of the daily cleaning and preventive maintenance would cancel
the contractual warranty.
1.3 Safety instructions
- The machine should not operate without supervision.
- The machine should only be used for its intended purpose.
- Only switch the machine on when the water shut-off valve is open.
- Only place empty cups on the cup warmer.
- Attention: coffee, hot water and steam can cause injuries.
- Never clean the machine with a high-pressure water jet.
- The hot parts of the machine, in particular the group and the cup warmer, can cause
burns. Gloves or a protecting cloth must be used when cleaning the hot parts.
- Gloves should be worn when removing and cleaning the basin to avoid injuries -
- The safety devices must be regularly checked and maintained (service engineer).
- Do not remove the cover panels (risk of electric shock).
- Do not cover the machine in operation to allow air circulation.
A regular and professional maintenance of the machine, the regular regeneration/refill of the
water softener and maintenance of the safety devices are compulsory.
1.4 Power supply instructions
- Never unplug or plug in when the main socket switch is on!
- The machine must be connected to a circuit breaker.
- The customer must provide an electrical installation complying with the requested
standards of the country where the machine is installed.
- The power socket must be protected against current defects.
- The terminal plug must earth the machine.
2

2 TECHNICAL FEATURES
MAIN WATER SUPPLY DRAIN ELECTRICAL SUPPLY
*Minimum inlet pressure 2,5 Bar
*Water connection pin 3/8"
(t-piece supplied)
*The water supply pipes must
resist to a constant pressure of 10
Bars
*Water hardness <7°f (5°c or 4°d)
*If the pressure of the main water.
supply is superior to 5bars a
regulator must be installed
*Without pressure
*Drain connection pin 1/2"
(t-piece supplied)
*The drain pipe must be lower
than the machine
400Vac - 50Hz
3 phases
or
230Vac - 50/60Hz
Single phase
UL et ULC
Single phase
230V - 60Hz
TYPE HEATING POWER TOTAL POWER ELECTRICAL
CONSUMPTION
(Watt) (Watt) (Amps)
230Vac 400Vac
2 GROUPS 7700 8000 21 max 14
3 GROUPS 9300 9500 21 max 14
BOILER CAPACITY ( IN LITERS )
2 Groups 3 Groups
TOTAL Hot Water/steam boiler 20 20
Hot water volume 14 14
Steam volume 6 6
Coffee boiler volume 2 x 0.5 3 x 0.5
WEIGHT (kg)
EMPTY Weight
(Kg) In operation
2G 60 75
3G 70 85
3

3 INSTALLATION
- Check the installation parameters (see 2. TECHNICAL FEATURES):
. power supply,
. water supply
. water hardness,
. waste outlet,
. air ventilation
. leveling.
- If the pressure of the water supply is above 5 bars, a pressure reducer has to be installed to
adjust the pressure between 3 and 4 bars.
- If the level is not correct, adjust the leveling in turning the 4 screws of the aluminum feet:
remove the “CONTI” cover to access to the front feet and remove the side panels to access
to the rear feet. A perfect level is very important to obtain an equal volume in the cups.
- Carry out the electrical and hydraulic connections.
- Connect the water softener between the cut-off tap of main water supply and the machine.
- Connect the machine to the waste outlet.
- Make sure that the flexibles are not squeezed and that the radius of curvature is as large as
possible.
- The emptying must be slightly inclined, the emptying in a siphon is recommended to avoid
the ascent of bad smell.
Note:
Means for disconnection from the supply having a contact separation of at least 3 mm in all
poles shall be incorporated in the fixed wiring according to the wiring rules.
4 ACCESSORIES
- 1 filter holder 1-cup
- 1 filter holder 2-cups for each group
- 1 filter 1-cup
- 1 filter 2-cups for each group
- 1 cleaning filter
- 1 cleaning brush
- 1 water hardness tester
- 1 cup support (for MUG-version) for each group
- 1 filter holder fastening lug for MAZZER grinder
- 1 T-piece 3/8 for water supply.
4

Part to maintain
P
5 STARTING OPERATION
5.1 Bleeding of the coffee boilers
Before the startup and the electric connection, the
coffee groups boilers must be purged.
Unscrew the 2 higher screws of the control panel
and rock it forwards, remove the 4 screws located
above the cup warmer and remove this last one.
Open the general water supply’s tap then unscrew
slightly the screw “P”' located at the back of each
boiler coffee, screw up the screw “P” as soon as the
drip begins.
Maintain the rear part on the boiler in order to
avoid a rotation during this operation
Renew the operation on each coffee group.
As soon as the machine is operating, make a dozen
of coffees (empty, without coffee) on each group.
If the water does not come out from the group,
check the opening of the taps on the flowmeters.
5.2 Filling of the hot water & steam boiler
- Check if the steam levers “V” are closed (low position).
- Switch the machine on in pressing ON/OFF. The display lights up and the automatic filling
up of the steam boiler starts. The machine doesn't warm up.
- When water reaches the safety sensor, the automatic heating of the boilers (coffee and
steam boilers in same time) starts.
- The LEDs of the touch buttons will become lit when the required temperature is reached.
- Hot water and steam can be used when the steam gauge indicates 0.8 bar (the standard
functioning pressure is 1.5 bar).
On/off
Hot water
Hot water control tap "E"Steam lever "V" (2)
à levier
Steam wand (2)
Display
Filter holder
Manometer "M"
Cappuccinatore
5.3 Next filling
The TWIN STAR 2 will manage the automatic filling of the boilers as long hot water is drawn
(water level sensor maximum).
♦ STANDARD PRESSURE – PRESSURE GAUGE:
The steam boiler pressure has been adjusted in the factory between 1.3 and 1.5 bars in the red
area. An electronic pressure switch maintains the constant pressure and restricts the power
consumption to the minimum.
An overheating thermostat will interrupt the boiler heating as soon as the temperature is
increasing abnormally.
THE MACHINE IS READY FOR OPERATION.
5

6 DESCRIPTION OF OPERATING DEVICES
6.1 Steam tap
Two steam taps operating with levers “V” heat liquids or froth milk for cappuccino by injecting
steam.
The liquid container should be high enough. The steam wand nozzle should soak into the liquid
but not touch the bottom.
6.2 Hot water tap
The electric tap “E” is made to prepare hot water specialties (tea, grog...).
The hot water temperature can be adjusted thanks to a mixer system. The volume of hot water
can also be adjusted via the programming mode.
6.3 Filters
The machine is supplied with 1-cup and 2-cup filters. Always ensure that the filters are
unclogged and clean. To remove used coffee grounds from the filter, turn the filter holder
upside-down and lightly tap it on the edge of a wooden box.
6.4 Dummy filter
The machine is delivered with a dummy filter. This component is only used for the daily cleaning
of the coffee groups.
6.5 Filter- holders
Never take the filter-holder off when the unit is operating, firstly, ensure that the fluid has
stopped flowing from the filter-holder outlet.
Always leave the filter-holders on the machine with the filters filled with the coffee grounds of the
previous coffee in order to maintain the temperature of the filter-holders.
When the machine is not in use for an expended period of time, remove the filter-holders and
expel the used coffee grounds.
6.6 Cappuccinatore (option)
This device is equipped with a 2-position switch and allows to produce froth or hot milk
automatically in pushing the right button of the left group of the machine.
To maintain sanitation standards it is compulsory that the operator cleans this component every
2 hours to prevent the risk of stale milk clogging the tubes.
6.7 Steam jet (option)
This kit allows to heat a liquid automatically in programming the steam temperature. The
temperature sensor in the steam wand detects the temperature required and the steam stops
automatically.
6.8 Espresso tray
Supplied with all Mug versions, this device allows to place espresso cups in a higher position.
6.9 Grinder fork
This part is supplied with the machines to adapt the filter holders of the Twin Star 2 to the
Mazzer grinders.
6.10 Water hardness tester
Supplied with the machine to check the water hardness of the main water supply.
6

7 FUNCTIONING & PROGRAMMING
7.1 Automatic switching ON & OFF
7.1.1 The Twin Star is connected to the main electrical supply: :
When switching on, the machine is getting back to the same state when it was switched off.
During 5 seconds the display indicates:
Twin star 2
R
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v. 1.11
7.1.2 The machine is switched off:
When the machine is switched off
All the LED’s are off, all the outlets are off.
All the functions are off except the programming of the main board.
The display indicates “OFF” and the time is shown on the display of the left group.
OFF HH:mm OFF OFF
All the led are off, all the outlets are off, all the functions are off except the programming of the
main board. The displays indicate "Off" and the time appears on the first group display.
7.1.3 The machine is switched on:
The displays are lit and indicate: “CONTI”, the current time and the name of each group.
CONTI HH:mm
Roaster name
CONTI
Roaster name
CONTI
Roaster name
The water supply solenoid valve is activated.
The water level regulation of the steam boiler is activated.
When the safety sensor is reached (probe SS in contact with water):
The security relay is activated.
When the level sensor is reached (sensor SN in contact with water):
The heating elements of all the boilers (coffee & steam) are heating.
When the required temperature of the coffee boiler is reached:
All the LED’s of the group are lit,
All the functions of the group are operating.
7.1.4 Automatic Switching On & Off:
The automatic switching on & off of the machine could be programmed for every day of the
week:
The main electrical supply must be switched on.
The timetable is programmed in advance.
A day off could be set.
The automatic switching on & off could be deactivated (see programming)
7

7.2 Programming
1 Cup
espresso
2 Cups
espresso
1 Cup
regular
coffee 2 Cups
regular
coffee
Cappuccino
(on left group)
Continous flow
(on the other groups)
LED
Hot water
dose
7.2.1 Programming of coffee measures ::
To get into the programming mode:
 Insert and turn the programming key. The displays indicate
Water volume
Pro
g
rammin
g
Parameters
Pro
g
rammin
g
Parameters
Pro
g
rammin
g
Press the right push-button (CAPPU/CONT) of the group to program.
- Programming the left group will also program the other groups.
- Programming the other groups will program each group individually.
The LED of the selected push-button blinks: PROGRAMMING MODE
Start the programming within 5 seconds (otherwise the machine will get out of the
programming mode).
Select the measure to be programmed by pressing the relevant button:
- All the LEDs of the group will go off,
only the LED of the selected measure will remain alight.
- The LED of the button CONT/CAPPU blinks.
- The pump and the solenoid valve of the related group are activated.
- The water is flowing. Once the required measure is reached, press the button again to stop
the flow.
- The data is stored.
The PROGRAMMING MODE will remain for 5 seconds (the right LEDs are blinking).
Continue the same procedure for the other measures of the group.
NOTES:
 During the PROGRAMMING MODE the LEDs of the already programmed push-buttons go off.
 Each group could be programmed individually: press the continuous flow button on the right of
each group.
 Maximum flow time of the coffee measures: 3 minutes.
8