NECTA SPA TECHNICAL MANUAL
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SFERA
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Manual
“ SFERA”
13 /
19
5- COOLING UNIT
The internal temperature controlled by means of an
NTC
type electronic, controlling a traditional type cooling unit,
but with design features that will bring it to the top of
what is currently available on the market.
Yje NTC probe has an internal resistance that varies
according to the ambient temperature change.
At the temperature of 0° C it is 2612 Ohm
At the temperature of 3° C it is 2267 Ohm
At the temperature of 30°C it is 733 Ohm
This way the software controls the unit switching on and
off with extreme accuracy.
The unit is controlled by means of a relay card located in
the power supply unit (SOR card).
When the machine is switched on, the software reads the
value (in Ohm) from the NTC probe and, according to that
value, sends a signal to the relay card that activates or
deactivates the cooling unit operation.
The cooling unit is very compact, with the air intake for the
condenser cooling from the lower part of the base through
a filter that removes the dust; such filter is accessible and
easy to remove for cleaning FIG. 2. The cooling air is
expelled from the front side through the lower grille,
allowing installation in a bank of machines or in a small
space without causing problems to the cooling unit.
In order to completely remove the cooling unit the
dispensing compartment assembly has to be removed
(quick and simple operation), therefore remove the
fastening screws from the unit and support the evaporator
during the extraction operation, ensuring that the power
cable and the power supply unit connector are
disconnected. FIG 3
The control software has the option of setting switching on
time periods, or the safety temperature. See specific
programming manual for further details. It is possible to
set the first two trays with a temperature suitable for
perishable food products.
FIG. 2
Condensation dust
removing filter
Removable
external grille
FIG. 3
Perspective view of cooling unit
Evaporator
Condenser
Compressor
Evaporator
Condenser
FIG. 1
Compressor
Fan
Liquid waste container
NTC Probe
Evaporator fan
