Icematic N21, Руководство по обслуживанию

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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
thesump 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 bypassing the condenser.
The hot gas circulating into the serpentine of the evapo-
rator warms up the ice cubes. The ice cubes, released
from the molds, drop by garvity onto a slanted grid chute,
then through a curtained opening they fall into the storage
bin.
At the end of the defrost cycle, bith 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 firts part of predetermined tem-
perature, it closes its contacts to supply power to the
timer motor which, in turn, takes over the control of the
setting extension of the cam high profile.
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 ther-
mostat 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 OFF
Compressor ........................................
■
Fan motor ...........................................
■
Hot gas valve......................................
■
Water inlet valve .................................
■
Water pump ........................................
■
Relay coil ............................................
■
Timer motor ........................................
■
Electric Controls............................... ON OFF
Conctats 3-4 evaporator thermostat...
■
Conctats 3-2 evaporator thermostat...
■
Bin thermostat ....................................
■
Conctats COM-NO timer microswitch
■
Conctats COM-NC timer microswitch.
■
Pressure control .................................
■
TIMED FREEZE
Electrical components (Loads) ....... ON OFF
Compressor ........................................
■
Fan motor ...........................................
■ ■
Hot gas valve......................................
■
Water inlet valve .................................
■
Water pump ........................................
■
Relay coil ............................................
■
Timer motor ........................................
■
Electric Controls............................... ON OFF
Conctats 3-4 evaporator thermostat...
■
Conctats 3-2 evaporator thermostat...
Bin thermostat ....................................
■
Conctats COM-NO timer microswitch
■
Conctats COM-NC timer microswitch.
■
Pressure control .................................
■ ■
I° PORTION HARVEST CYCLE
Electrical components (Loads) ....... ON OFF
Compressor ........................................
■
Fan motor ...........................................
■
Hot gas valve......................................
■
Waetr inlet valve .................................
■
Water pump ........................................
■
Relay coil ............................................
■
Timer motor ........................................
■