Simag SD 22 Bedienungsanleitung Seite 14

The incoming water, passing through the water
inlet valve and in its incorporated flow controE
(outlet), runs overtheeva
flow s by gravit y throug h tRe d ribbler
into the sump/reservoir.
The water fj Illngthe 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 hotgas, 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
starts again a new freezing cycle.
OPERATION - CONTROL
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,
takesoverthecontrol o f thefreezing cycle.
This second part of the cycle has a pre-flxed time
duration which is relied to the setting extension of
the cam high profile.
NOTE. The evaporator thermostatis factory
set to the number 4 of its setting dial.
In case it is required the. setting of the
evaporator thermostatcan be made by turning
its adjusting screw located on front side.
With a clockwise rotation ofthe 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 automaticaFIyinto the defrost
cycle which has a pre-fixed length as well.
Atcompletionofthé defrostperiodtheunitstarts
again a new freezing cycle.
OPERATION - ELECTRICAL
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 unitas
it is in the Evaporator Thermostat mode of
the Freezing Cycle.
oratorplaten and then
holes down
close and the machine
SEQUENCE
SEQUENCE
BEGINNING FREEZE
Electrical components (Loads).
Compressor .
Fan
Hot gas valve
Water inlet valve
Water pump
Relay coil
Timer
Electric Controls „
Conctats 34 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) ......„
Compressor
Fan motor.....
Hot gas valve
Water inlet valve .....................
Water pump ...
Relay coil
Timer motor .
Electric Controls ............„.......
Conctats 3-4 evaporator thermostat ...
Conctats 3-2 evaporator thermostat .
Bin thermostat ..... .................
Conctats COM-NO timer microswitch
Conctats COM-NC timer microswitch
Pressure control ......................
PORTION HARVEST CYCLE
Electrical components (Loads) ..„....
Compressor ................................„......
Fan motor
Hot gas valve
Water intet valve ..... ..... ..... ...
Water pump .
Relay coil
Timer motor
Electric Controls
Conctats 3-4 evaporator thermostat ...
Conctats 3-2 evaporator thermostat .
Bin thermostat ...
Conctats COM-NO timer microswitch
Conctats COM-NC timer microswitch
Pressure control
Page 7
ON OFF
ON OFF
.
ON OFF
..
•
. ON OFF
... .....
ON
OFF
.
ON OFF
.
.