Operating Principle - Ugolini MINIGEL PLUS 1 Manual De Servicio

(T) Alarm Icon: icon ON => an alarm is active
(U) Defrost timer Icon: icon ON => Defrost timer active, the switching between conservation and ice cream mode is operated
automatically following the timer settings and can't be performed manually.
(V) Locked Keyboard Icon: icon ON => keyboard is locked and it is impossible to adjust the machine unless the keyboard is un-
locked (key E + key H pressed for 2 seconds)
(W) Cup sensor: the cup sensor detects the presence of a cup up to a distance of approx 15 cm and increases the rotation speed
of the mixer to the value of the parameter PA03
On dispensers with more than one tank, the ON/OFF key (A) and related indica-
tor light (B) are only present on the control panel of the right-hand tank but their
operation affects the entire appliance. Therefore pressing key (A) will turn all the
tanks on or off and, where featured, it will also turn all the lights on or off.
On dispensers with more than one tank, should you wish to turn off a single
tank, you will have to press the key for the operating mode currently in use on
the related control panel. Both the cooling and the mixer will stop and the corre-
sponding display will show the message: OFF.

2 OPERATING PRINCIPLE

The operating principle of this dispenser is based on cooling and concurrently mixing the product inside the transparent tank. When
the product reaches negative temperatures, it begins to freeze, thereby increasing in density and therefore the effort required by the
geared motor to mix it. Using the electricity consumption value, the electronic control system is able to determine this effort and when
it reaches a set level, the solenoid valve is closed, thereby shutting off the supply of refrigerant gas to the evaporator cylinder. Since
the product is no longer cooled, it tends to melt, thereby decreasing in density and therefore the effort required by the geared motor
to mix it. When the effort drops below a set level, the solenoid valve re-opens, the refrigerant gas resumes its passage through the
evaporator cylinder and the product cools down and increases in density again. This regulation system ensures the density of the
product is kept at a set level.
Setting the density of the product to between 1 and 10 makes it possible to obtain a product with the required level of density. By
default, the maximum setting, i.e. when the density is set to 10, corresponds to consumption of electrical power of 65 watts, which
can be increased to 100 watts by starting up the machine in Service Mode and adjusting the PA02 parameter (see relative para-
graph). Each density setting value corresponds to 1/10 of the value of the PA02 parameter. In addition to this, the machine checks
that the product temperature does not drop below a minimum operating temperature defined by the PA03 parameter, whose default
setting is -14 °C. This setting is useful to prevent the remaining product gradually reaching ever lower temperatures as the container
is progressively drained.
Again starting up the machine in Service Mode, it is also possible to set the rotation speed of the mixer when the product is being
prepared (PA03 parameter), when the product is ready (PA04 parameter) and when the machine is in product storage mode (PA05
parameter).
When the ice cream production operating mode is selected, the compressor is
always on. When the dispenser is turned on, after the 120-second safety delay,
the compressor starts up and always stays on.
When the product conservation operating mode is selected, the compressor is
only on if at least one of the solenoid valves is open and therefore if at least one
of the tanks requires cooling. Every time the compressor is turned off, a safety
time lapse of 120 seconds must pass before it can be restarted.
As well as the operating modes described in the Instruction Manual, the dispenser may be started up in other modes which can be
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