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consequently to the compressor and fan motors
and 30" later, to the water pump motors.
Then, as the ice thickness reaches the value that
corresponds to the full cube size, the film of water
that constantly cascades over the slab of ice
formed on the evaporator, arrives to establish a
contact between the two fingers (energised at
low voltage) of the ice sensor control, located on
the front upper right side of the evaporator. If the
contact between the two fingers of the ice sensor
remains established - by the film of water - for
more than 10 seconds, a small relay of the
electronic board, get energized, controlling -
simultaneously the hot gas valve, the water drain
valve and the harvest assist solenoid.
NOTE: in case of failure of ice level sensor,
the P.C. Board turns - on automatically the
unit into the defrost cycle when the freezing
cycle reaches 30 or 40 minutes according to
the operation of the fan motor during the
freezing cycle.
At this point, the unit initiates the defrost cycle.
The hot gas circulating into the evaporator
serpentine causes a slight melting of ice cubes
which get released from their molds. In the mean
time the harvest assist solenoid is also energized
pushing out the ice plate.
Once entirely released the ice cubes drop
simultaneously into the ice storage bin below; by
doing so they move apart from the evaporator
bottom end the plastic deflector.
This plastic deflector has on its side a magnetic
switch that on account of the deflector swinging
motion, caused by the ice while dropping in the
bin, opens and closes their contacts.
This will, in turn, disactivate the relay contacts
that controls the hot gas, harvest assist solenoid
and water drain valve which get deenergized
allowing the unit to start a new freezing cycle.
When the ice bin is full of ice, the last batch of ice
cubes released from the evaporator accumulates
to keep the bottom end of the plastic deflector in
open position; with the magnetic switch contacts
open for longer than 30'’ the entire unit stops with
the glowing of the corresponding LED.
The machine will restart when the ice deflector will
be back in its normal vertical position provided
that 3' are elapsed from unit stop. If not the
machine will delay its restart till 3' are elapsed with
the blinking of the green LED.
ALARM CONDITIONS
Both the last two Red LED are ON STEADY:
Condenser Sensor OUT OF ORDER.
Both the last two Red LED are BLINKING SLOW:
WATER ERROR
Water level inside the water sump too low after 3'
from the activation of the Water Inlet Valve.
Both the last two Red LED are BLINKING FAST:
RESET MODE: Charging water through the Water
inlet Solenoid Valve after the tripping OFF on
WATER ERROR
The fourth Red LED is ON STEADY: Harvest
Cycle longer then 3' 30"
The fourth Red LED is BLINKING SLOW: TOO HI
CONDENSING TEMPERATURE. The condenser
sensor detected a temperature > 65
°
C
The fourth Red LED is BLINKING FAST:
RESET MODE: Condenser Sensor < 50
°
C Fan
motor in operation for 3' then back on Start Up
Cycle Mode
The fifth Red LED is ON STEADY: TOO HI
DISCHARGE PRESSURE > 33 bar (460 PSI)
The fifth Red LED is BLINKING FAST:
RESET MODE: After pushing the Reset
Button of the Pressure Control the fan motor
starts up first for 3' then the machine enters
on the Start Up Cycle Mode.
The PC Board is also checking the maximum
time of the freezing cycle that changes according
to the operation of the fan motor during the
freezing cycle (room temperature):
• Fan motor in
Max. freezing cycle length
ON-OFF mode:
equal to 30'
• Fan motor ON
Max. freezing cycle length
All the time:
equal to 40'
Whenever the machine remains in the Freezing
Cycle for the Maximum time (30 or 40 minutes),
the PC Board moves the unit directly into the
Harvest Cycle.
POWER
OPER.
BIN
FULL
ALARM
ALARM
HI
PRESS.
RE-SET
POWER
OPER.
BIN
FULL
ALARM
ALARM
HI
PRESS.
RE-SET
POWER
OPER.
BIN
FULL
ALARM
ALARM
HI
PRESS.
RE-SET
