22
CONTROL SEQUENCE
At the start of the freezing cycle, the contacts of
the magnetic switch mechanically operated
bythe actuator plate of the deflector cover are
closed, thereby - via PC board - closing the
circuit to the main contactor coil and
consequently to the compressor and fan motors
and 40" 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
(energized 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 6 seconds,
a small relay of the PC board, get energized,
controlling -simultaneously both the harvest
valve and the water drain valve.
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. 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, deactivates the relay contacts that
controls the hot gas and water drain valve
which get de-energized 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
BIN FULL 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 BIN FULL 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 slow after 3' or 6' from the
activation of the Water Inlet Valve,
according DIP Switch #4..
Both the last two red LED are
blinking fast:
Water error recovery
.
Every 30 minutes, Water inlet
Solenoid Valve will open 180
seconds for recharge water after
the tripping OFF on water error, If
water full, the machine automatic
reset.
Reset mode
:
Open the front panel, And press
MODE button can go to start up
cycle.
The fourth red LED is on steady:
3 times too long Harvest Cycle
time
(according DIP Switch #3
setup),
The fourth red LED is blinking slow:
Too Hi condensing temperature
error.
The condenser sensor detected a
temperature >70
℃.
For the first 2 times, machine will
automatic reset when temperature
drop down. and the machine will
stop when high temperature occurs
the third time, ice machine will stop,
Reset mode:
Open the front panel, And press
MODE button that can go to start up
cycle.
NOTE:
in case of failure of ice level sensor,
the PC 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.
