Werbung
Verfügbare Sprachen
Verfügbare Sprachen
CONTACTOR COIL (SMN 75-125)
FAN MOTOR (only SMN 35) air cooled
WATER INLET SOLENOID VALVE
HOT GAS SOLENOID VALVE
TIMER MOTOR
The incoming water, passing through the water
inlet valve and in its incorporated flow control
(outlet), runs over the evaporator platen and then
flows by gravity through the dribbler holes down
into the sump/reservoir.
The water filling the sump/reservoir forces part of
the left-over water from the previous batch to run
out to the waste through the overflow pipe. This
overflow limits the level of the sump water which
will be used to produce the next batch of ice
cubes.
Meanwhile, the refrigerant as hot gas, discharged
from the compressor, flows through the hot gas
valve directly into the evaporator serpentine by-
passing the condenser.
The hot gas circulating into the serpentine of the
evaporator warms up the copper molds or the
tips causing the defrost of the ice cubes. The ice
cubes, released from the molds, drop by gravity
onto a slanted grid chute, then through a curtained
opening they fall into the storage bin.
At the end of the defrost cycle, both the hot gas
and the water inlet valves close and the machine
starts again a new freezing cycle.
OPERATION - CONTROL SEQUENCE
At the start of freezing cycle, the evaporator
thermostat controls the length of the first part of
the freezing cycle. As its bulb senses a
predetermined temperature, it closes its contacts
to supply power to the timer motor which, in turn,
takes over the control of the freezing cycle.
This second part of the cycle has a pre-fixed time
duration of 12 minutes.
.
NOTE. The evaporator thermostat is factory
set to the number 4 of its setting dial.
In case it is required the setting of the
evaporator thermostat can be made by turning
its adjusting screw located on front side.
With a clockwise rotation of the setting screw
the thermostat cut IN temperature will be
lowered (longer freezing cycle - thicker ice
cube) while, with a counterclockwise rotation
of the screw, the Cut IN temperature rises
(shorter freezing cycle - thiner ice cube).
Once completed the freezing cycle 2nd phase
the system switches automatically into the defrost
cycle which has a pre-fixed length as well.
At completion of the defrost period the unit starts
again a new freezing cycle.
OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches
and which components are ON or OFF during a
particular phase of the icemaking cycle.
Refer to the wiring diagram for a reference.
NOTE. The wiring diagram shows the unit as
it is in the Evaporator Thermostat mode of the
Freezing Cycle.
BEGINNING FREEZE
Electrical components (Loads) ....... ON
Compressor ........................................
Fan motor ...........................................
Hot gas valve .....................................
Water inlet valve .................................
Water pump ........................................
Contactor coil .....................................
Timer motor ........................................
Electric Controls .............................. ON
Conctats 3-4 evaporator thermostat ..
Conctats 3-2 evaporator thermostat ..
Bin thermostat ....................................
Conctats timer
Conctats timer
Pressure control (SMN35÷45W) (SMN45÷SM125A)
TIMED FREEZE
Electrical components (Loads) ....... ON
Compressor ........................................
Fan motor ...........................................
Hot gas valve .....................................
Water inlet valve .................................
Water pump ........................................
Contactor coil .....................................
Timer motor ........................................
Electric Controls .............................. ON
Conctats 3-4 evaporator thermostat ..
Conctats 3-2 evaporator thermostat ..
Bin thermostat ....................................
Conctats timer
Conctats timer
Pressure control (SMN35÷45W) (SMN45÷SMN125A)
°
I
PORTION HARVEST CYCLE
Electrical components (Loads) ....... ON
Compressor ........................................
Fan motor (SMN 35 ON) ..............
Hot gas valve .....................................
Water inlet valve .................................
Water pump ........................................
Contactor coil .....................................
Timer motor ........................................
Electric Controls .............................. ON
Conctats 3-4 evaporator thermostat ..
Conctats 3-2 evaporator thermostat ..
Bin thermostat ....................................
Conctats timer
Conctats timer
Pressure control (SMN35÷45W) (SMN45÷SM125A)
15
OFF
•
•
•
•
•
•
•
OFF
•
•
•
•
•
•
OFF
•
•
•
•
•
•
•
•
OFF
•
•
•
•
•
•
•
OFF
•
•
•
•
•
•
•
OFF
•
•
•
•
•
•
Werbung
