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COMPONENTS DESCRIPTION
A. EVAPORATOR TEMPERATURE
SENSOR
The evaporator temperature sensor probe,
located in contact with the evaporator serpentine,
detects the dropping of the evaporator tempera-
ture during the freezing cycle and signals it by
supplying a current flow to the micro processor of
P.C. BOARD.
According to the current received is energized
the small Red LED of the PC Board (blink or
steady).
When steady, the micro processor supplies power
to the electronic timer built into the P.C. BOARD
so that it takes control of the last portion of
freezing cycle.
The length of the timed phase is pre-fixed by the
setting of the keys 1, 2, 3 and 4 of the DIP
SWITCH.
NOTE. Whenever, after 15 minutes from the
beginning of the freezing cycle, the
evaporating temperature have not yet reached
the value of 0
°
C (32
°
F) - small Red LED OFF
- the P.C.Board switches OFF the machine
with the BLINKING of WARNING RED LED.
B. CONDENSER TEMPERATURE
SENSOR
The condenser temperature sensor probe,
located within the condenser fins (air cooled
version) or in contact with the tube coil
(water cooled version) detects the condenser
temperature variations and signals them by
supplying current, at low voltage, to the P.C.
BOARD.
In the air cooled versions, in relation to the
different current received, the micro processor
of the P.C. BOARD supplies, through a TRIAC,
the power at high voltage to the fan motor so to
cool the condenser and to reduce its tempera-
ture.
In case the condenser temperature rises and
reaches 70°C (160°F) - on air cooled models - or
60°C (140°F) - on water cooled models - the
current arriving to the micro processor is such to
cause an immediate and total stop of the machine
operation.
C. ICE LEVEL THERMAL PROBE
It operayes in detecting both the low tempera-
ture of the ice and the mass near the bin
sensing bulb.
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 only at the end of
the harvest cycle 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 Bin Full
YELLOW LED starts to blink; the ice machine
stops with the glowing-up of the Bin Full YELLOW
LED to monitor the situation of ice bin full at the
end of the harvest cycle.
Six seconds after the scoop out of the ice (with
the resumption of the light beam between the two
infrared sensor of ice level control) the ice machine
restarts again with the extinguishing of the
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 fuse on power out
(6.3 A), of four aligned LEDS monitoring the
operation of the machine, of one extra
monitoring RED LED (blink 0°C - steady -
15°C), of one DIP SWITCH with ten keys, of
one push button, of input terminals for the
leads of the sensor probes and input and
output terminals for the leads of the ice maker
electrical wires.
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