D. ICE BIN LEVEL LIGHT CONTROL
The electronic ice bin level control, located into
the storage bin, has the function to stop the
operation of the ice machine when the light beam
between the light source and the sensor is
interrupted by the ice cubes stored into the bin.
When the light beam is interrupted the RED LED
located in the front of the P.C. BOARD goes off;
in case the light beam is constantly interrupted
for more than 60 seconds, the ice machine stops
with the glowing-up of the 2nd YELLOW LED to
monitor the situation of ice bin full.
The 60 seconds of delay prevent that an ice
scoop movement or the ice dropping through the
ice chute (interrupting for a while the light beam)
can stop the operation of the unit.
As soon as the ice is scooped out (with the
resumption of the light beam between the two
infrared sensor of ice level control) the RED LED
is lighted up and after 6 seconds the ice machine
restarts again with the extinguishing the 2nd
YELLOW LED.
E. P.C. BOARD (Data processor)
The P.C. BOARD, fitted in its plastic box located
in the front of the unit, consists of two separated
printed circuits one at high and the other at low
voltage integrated with a program selector, of
two fuses one on power in (100mA) and one on
power out (16 A), of five aligned LEDS monitoring
the operation of the machine, of two extra
monitoring RED LEDS, of one DIP SWITCH with
ten keys, of one small jumper located on its back
side, of input terminals for the leads of the sensor
probes and input and output terminals for the
leads of the ice maker electrical wires.
The P.C. BOARD is the brain of the system and
it elaborates, through its micro processor, the
signals received from the four sensors in order to
control the operation of the different electrical
components of the ice maker (compressor, water
pump, solenoid valves, etc.).
By turning the program selector it is possible to
put the unit in the following different situations:
CLEANING/RINSING. The water pump is the
only electrical component in operation and it
must be used during the cleaning or the rinsing
procedure of the water system of ice machine.
STAND BY. The unit remain under electrical
power but OUT of operation. It can be used by the
service engineer in order to stop the unit during
the service and inspection operations.
IN OPERATION. The unit is running through the
freezing and defrost cycles stopping automatically
only at full bin situation.
RE-SET/HI TEMPERATURE. To be selected to
resume the unit operation when the ice maker
shuts off due to the intervention of the condenser
temperature sensor (too high condensing tem-
perature) or evaporator temperature sensor (too
high after 15 minutes from the beginning of the
freezing cycle).
The five LEDS, placed in a row in the front of the
P.C. BOARD, monitor the following situations:
GREEN LIGHT
Unit under electrical
power
YELLOW LIGHT
Unit shut-off at full storage
bin
RED LIGHT
Unit shut-off due to hi
condensing temperature
RED LIGHT BLINKING
Unit shut-off due to hi
evaporating temperature
YELLOW LIGHT
Unit in freezing cycle
mode
YELLOW LIGHT
Unit in cleaning/rinsing
mode (not appearing in
the front panel)
By means of one small jumper, located on the
back side of the P.C. Board, can be modified
the cut-OUT condensing temperature (safety
temperature) from 70°C (160 °F) - for air cooled
versions to 62° (145 °F) - for water cooled
versions.
F. DIP SWITCH
The P.C.BOARD which controls the entire
operation of the ice maker, has a DIP SWITCH
with ten switching keys which allow to set up
the micro processor program in order to extend
or to shorten the length of freezing and defrost
cycles in relation to the different model and
versions of ice machines.
Page 24
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