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COMPONENTS DESCRIPTION
A.
EVAPORATOR TEMPERATURE
SENSOR
The evaporator sensor probe is inserted into its
tube well, which is welded on the evaporator
outlet line, it detects the temperature of the
refrigerant on the way out from the evaporator
and signals it by suppling a low voltage current
flow to the P.C. Board.
According to the current received, the micro-
processor let the ice maker to continue its
operations or not. In case the evaporating tem-
perature, after 10 minutes from the unit start-up,
does not go below -1°C (30°F) the evaporator
sensor signals to stop immediately the unit
operation, with the blinking of the 5th Warning
YELLOW LED.
NOTE. The machine will remain in OFF mode
for one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3 times in 3 hours, the machine SHUTS OFF
DEFINITIVELY.
To restart the unit after the shutoff caused by
the hi evaporating temperature, it is neces-
sary to switch OFF and ON the power line
main disconnect Switch.
B.
WATER LEVEL SENSOR
This sensor consists of two small stainless steel
rods vertically fitted on the inner face of the
reservoir cover and electrically connected to the
low voltage circuit of the P.C. Board.
When the cover of the reservoir is positioned in
its place the tips of both the rods dip into the
reservoir water transmitting a low power current
throu the same.
NOTE. In the event of shortage of water in
the reservoir or, in case the water used is too
soft (de-mineralized) to cause greater
resistence to the current flow (electrical
conductivity lower than 30 µ S) this sensor
system causes the shutoff of the machine,
to protect it from running without water or
with an inadequate water quality. In this
situation the YELLOW LED will glow to warn
of the machine shutoff and the reason why.
C.
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 tempera-
ture variations and signals them by supplying
current, at low voltage, to the P.C. BOARD.
In case the condenser temperature sensor detects
a temperature at the condenser lower than +3
°
(37
F) that means ambient temperature too low
for the correct unit operation, the sensor signals
to the P.C. BOARD to do not start up the unit till
the ambient temperature rises to 10°C.
In the air cooled versions, in relation to the
different current transmitted, the micro processor
of the P.C. BOARD supplies, through a TRIAC,
the power at high voltage to the fan motor.
In the event the condenser temperature rises
°
and reaches 60
C or 70
setting of DIP SWITCH number 8 the current
arriving to the micro processor is such to cause an
immediate and total stop of the machine operation.
NOTE. The machine will remain in OFF mode
for one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3 times in 3 hours, the machine SHUTS OFF
DEFINITIVELY.
To restart the unit after the shutoff caused by
the hi condenser temperature, it is neces-
sary to switch OFF and ON the power line
main disconnect Switch.
D.
ELECTROMAGNETIC SENSOR
This safety device is housed on top of the Drive
Motor and detects - based on Hall Effect principle
- the rotating speed and rotating direction of the
drive Motor.
Should the rotating speed drop below 1300 r.p.m.
the magnitude measured by this device is such to
signal to the microprocessor to stop the unit and
light-up the YELLOW LED. The same reaction
occures when the drive motor will tend to rotate
in the wrong direction (counterclockwise) or when
it doesn't rotate at all.
NOTE. The machine will remain in OFF mode
for one hour then it will restart automa-tically.
In case the unit trips OFF again in alarm for
3 times in 3 hours, the machine SHUTS OFF
DEFINITIVELY. To restart the unit after the
shutoff caused by this safety device, it is
necessary first to eliminate the cause that
has generated the intervention of the device
and then switch OFF and ON the power line
main disconnect switch.
E.
OPTICAL ICE LEVEL CONTROL
The electronic optical ice level control, located
at the ice chute, has the function to stop the
operation of the ice machine when the light beam
between the light source and the receiver gets
interrupted by the flake ice which accumulates
in the chute.
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°
C
°
C according to the
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