Conti TWIN STAR 2, Technical Documentation Manual

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7.6 Heating of the boilers
The heating of the boilers is managed by the main board when the machine is switched on.
A relay card located at the rear right side supplies the heating elements as follows:
Boilers Probes Resistances
Steam Pressure switch RC1 + RC2 + RC3
Coffee Group 1 Sensor ST1 RCC1
Coffee Group 2 Sensor ST2 RCC2
Coffee Group 3 Sensor ST3 RCC3
7.6.1 Regulation terms :
_ Coffee boilers:
The temperature is regulated with a probe (NTC) installed on each coffee boiler (hysteresis of 1
°C)
When the temperature reaches the programmed T° the supply of the relay will stop
When the temperature is 1° C above the programmed T°
the supply of the relay is going on
_ Steam boiler:
When the 2-bar pressure is detected by of the pressure switch, the contact of the pressure
switch will open and the relay will deactivate and stop heating. A time filter has been installed to
avoid constant backlashes of the relay which could damage its contact.
7.6.2 Management of the electrical consumption:
With voltage 400V 3NAC or 230V 3AC (power 0)
:
All heating elements can be heated in the same time.
The heating elements are supplied separately according to the above described temperature
regulation.
The maximum consumption of the machine can reach
14Amps per phase (3 group machine).
With voltage 230V 1NAC (power 1 or 2)
:
To reduce power consumption, the machine only heats 2 or 3 heating elements at the same time.
Priority is given to the coffee boilers but one of the three heating elements of the steam boiler can
be supplied continuously.
Order of priority:
RCC1 (heating element coffee boiler GR 1)
RCC2 (heating element coffee boiler GR 2)
RCC3 (heating element coffee boiler GR 3)
RC1 (heating element 1 for steam boiler)
RC2 (heating element 2 for steam boiler)
RC3 (heating element 3 for steam boiler) : desactived in position :
POWER 2
The steam boiler can be heated with 1, 2 or 3 heating elements depending on the heating of the
coffee boilers.
The power consumption is limited
to 21 Amp (power 1) or 16 Amp (power 2).
(These parameters have been adjusted in the factory).
7.6.3 Desactivation of coffee groups:
The user can deactivate temporarily one or several groups to reduce the power consumption
(see programming, Bar menu ) .
The LEDs of the deactivated group are OFF,
The heating is deactivated,
Remark : the programmed data of the group (measures, temperature, etc.) remain stored.
7.7 Programming
18