Table of Contents
Advertisement
Page 10
WATER CIRCUIT
The water enter in the machine through the
water inlet fitting (which incorporates a strainer
and it is located at the rear side of the cabinet)
and then it goes to the water reservoir flowing
through a float valve.
NOTE. The presence of the water in the float
reservoir is detected by a system of two
sensors which operates in conjunction with
the P.C. Board. The two sensors use the
water as a conductor to maintain a low voltage
current flow between them. In case the water
used is very soft (de-mineralized) or the float
reservoir gets empty the current flow between
the sensors become so weak or is no longer
maintained that, as consequence, the P.C.
Board shutoff the flaker operation with the
simultaneous glowing of the YELLOW LED
signalling "Shortage of water".
The float reservoir is positioned at the side of the
freezing cylinder at such an height to be able to
maintain a constant water level around the freezer
auger. In fact, the water flows from the reservoir
into the bottom inlet of the freezing cylinder to
sorround the stainless steel auger which is
vertically fitted in the center of the freezer.
In the freezer the incoming water gets chilled into
soft (slush) ice which is moved upward by the
rotating action of the auger. The stainless steel
auger that rotates counter-clockwise within the
freezer, is powered by a direct drive gear motor
and carries the ice upward along the refrigerated
freezer inner walls and by doing so the ice gets
progressively thicker and harder.
FLOAT TANK
ICE SPOUT
FLOAT VALVE
FREEZER
FREEZER
WATER
FEED LINE
The ice, being costantly lifted up, meet the tooth
of the ice breaker which is fitted on the top end of
the auger, where it gets compacted, cracked and
forced to change from vertical into horizontal
motion to be discharged out, through the ice
spout, into the storage bin.
By running the ice maker, i.e. by putting the unit
under power, starts the automatic and continuous
icemaking process which would not stop until the
PRINCIPLE OF OPERATION
ice storage bin gets filled-up to the level of the
control "eyes" located on the sides of the ice
spout. As the ice level raises to interrupt the light
beam running between the two infrared lamps,
the unit stops after six seconds, with the
simulteneous glowing of the YELLOW LED
signalling the "Full Bin" situation.
NOTE. The interruption of the light beam
between the two light sensors is immediately
signalled by the blinking of the 1st YELLOW
LED located on the front of the P.C. Board.
After about 6" of steady interruption of the
light beam the unit stops and the "Full Bin"
YELLOW LED glows.
The six seconds of delay prevent the unit
from stopping for any undue reason like the
momentarily interruption of the light beam
caused by the flakes that slides along the ice
spout before dropping into the bin.
As some ice is dispensed from the storage bin,
the light beam between the two sensors resumes
and immediately the 1st YELLOW LED blinks
fast; six seconds later the ice machine restarts
the ice making process and the YELLOW LED
goes off.
REFRIGERANT CIRCUIT
The hot gas refrigerant discharged out from the
compressor 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 it looses some of its pressure
so that its pressure and temperature are lowered.
Next, the refrigerant enters into the evaporator
coil wrapped around the freezer inner tube.
The water being constantly fed at the interior of
the freezer inner tube, exchange heat with the
refrigerant circulating into the evaporator coil,
this cause the refrigerant to boil-off and evapora-
te, thereby it changes from liquid into vapor.
The vapor refrigerant then passes through the
suction accumulator and through the suction line
where the refrigerant exchanges heat with the
one flowing into the capillary tube (warmer) before
being sucked into the compressor to be
recirculated.
The refrigerant heat pressure is kept between
two pre-set values 9
the condenser temperature sensor which has its
probe located within the condenser fins - in air
cooled versions.
This condenser temperature sensor, when
senses a rising of the condenser temperature
beyond the pre-fixed limit, changes its electrical
resistance and send a low voltage power flow to
the MICRO-PROCESSOR of the P.C. Board
which energizes, through a TRIAC, the Fan
Motor in ON-OFF mode.
Page 10
÷
÷
10 bar -125
140 psig by
Hide quick links:
Advertisement
Table of Contents
