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Page 16
How it works
In the SCOTSMAN cube ice makers the water
used to make the ice is kept constantly in
circulation by an electric water pump which primes
it to the spray system nozzles from where it is
diverted into the inverted mold cups of the
evaporator (Fig. A).
A small quantity of the sprayed water freezes
into ice; the rest of it cascades by gravity into the
sump assembly below for recirculation.
FREEZING CYCLE
The hot gas refrigerant discharged out from the
compressor (Fig. B) reaches the condenser
where, being cooled down, condenses into liquid.
Flowing into the liquid line it passes through the
drier filter, then it goes all the way through the
capillary tube where, due to the heat exchanging
action, it looses some of its heat content so that
its pressure and temperature are lowered as
well. Next the refrigerant enters into the
evaporator serpentine (which has a larger I.D.
then the capillary) and starts to boil off; this
reaction is emphasized by the heat transferred
by the sprayed water.
The refrigerant then increases in volume and
changes entirely into vapor.
The vapor refrigerant then passes through the
suction accumulator (used to prevent that any
small amount of liquid refrigerant may reach the
compressor) and through the suction line. In
both the accumulator and the suction line it
FIG. 7
TEMPERATURE
SENSORI
SENSORS
EVAPORATORE
EVAPORATOR
CONTENITORE
BIN
L
1
N
2
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
PRINCIPLE OF OPERATION
SELECTOR
SELETTORE
TIMER
ELECTR.
ELETTR.
TIMER
FUSE
FUSIBILE
TRASFOR-
TRANSF.
MATORE
FUSE
FUSIBILE
FUSIBILE
FUSE
exchanges heat with the refrigerant flowing into
the capillary tube (warmer), before to be sucked
in the compressor and to be recirculated as hot
compressed refrigerant gas.
The freezing cycle is controlled by the evaporator
temperature sensor (which has its probe in contact
with the evaporator serpentine) that determines
the length of the first and second portion of it; the
starts up of the freezing cycle is signalled by the
glowing of the 6th RED LED.
The first portion length or time T1 (Not adjustable)
is equal to the time required by the temperature
sensor to fall to 0°C (32°F). When reached, it is
signalled by the glowing of the 5th RED LED.
NOTE. If, after 15 minutes, the evaporator
temperature has not yet reached the value of
°
°
0
C (32
F) ( due to a partially or total shortage
of refrigerant or to a too high condensing
temperature, etc.) the sensor, through the
P.C. BOARD, causes the unit to stop the
operation with the simoultaneous glowing of
the 2nd RED WARNING LED (Fig. 7).
After having eliminated the source of the unit
trip off, to restart the machine operation it is
necessary first to rotate the program selector
on RE-SET position, then put it again on to
OPERATION position or, alternatively, switch
OFF and ON the hand disconnect Main
Switch.
The ice machine resumes its normal operation
by going through the 5 minutes water filling
phase.
DIP
SWITCH
RELAY
RELÈ
3
4
RELÈ
RELAY
5
6
RELÈ
RELAY
7
8
Page 16
VALVOLA SCARICO ACQUA
WATER DRAIN VALVE
VALVOLA INGR. ACQUA
WATER IN VALVE
HOT GAS VALVE
VALVOLA GAS CALDO
WATER PUMP
POMPA
FAN MOTOR
VENTILATORE
COMPRESSOR
COMPRESSORE
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