A.
EVAPORATOR TEMPERATURE
SENSOR - BLACK 2 POLES CONNECTOR
-
MANUAL RESET
(see **NOTE)
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 suppying a low voltage current
flow to the P.C. Board Micro-Processor.
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 signal reaching the microprocessor is
such to stop immediately the unit operation, with
the 3rd Warning YELLOW LED that blinks.
B.
WATER LEVEL SENSOR - RED TWO
POLES CONNECTOR - AUTOMATIC
RESET
This sensor system consist 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
and detects and signals its presence by supply
power back to the P.C. Board.
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 (conductivity
lower than 30
µ
S) this sensor system causes
the shutoff of the machine, to protect it from
running with an interrupted or inadequate
water supply.
In this situation the 5th YELLOW LED will
glow to warn of the machine shutoff and the
reason why.
C.
CONDENSER TEMPERATURE SENSOR
-
WHITE TWO POLES CONNECTOR
-MANUAL RESET
(see **NOTE)
The condenser temperature sensor probe,
located within the condenser fins detects the
condenser temperature variations and signals
them by supplying current, at low voltage, to the
P.C. BOARD.
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 that it can cool the condenser and
reduce its temperature.
In the event the condenser temperature rises
and reaches 70
°
C
/158
°F
the current arriving
to the
micro processor is such to cause an
immediate
and total stop of the machine
operation with the
glowing of the 2nd RED
WARNING LED.
**
NOTE. To restart the unit after the
shutoff
it
is necessary to push the RE-
SET button
(after having remedied to the
causes of unit
stoppage) or to switch OFF
and ON the
power line main disconnect Switch.
D.
GEAR MOTOR ROTATION AND SPEED
SENSOR - RED FOUR POLES
CONNECTOR
- MANUAL RESET
(see **NOTE)
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 3rd YELLOW LED.
The same reaction occures when the drive motor
will tend to rotate in the wrong direction
or it doesn't rotate at all.
NOTE. 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 press
the RE-SET push button or switch OFF and
ON the power line main disconnect switch.
FIG. 8
BLINKING - FLASHING TOGETHER
EVAPORATOR SENSOR OUT OF ORDER
FIG. 9
STEADY TOGETHER
CONDENSER SENSOR OUT OF ORDER
GEMD270A
Page
13
COMPONENT DESCRIPTION