Icematic N25S, Service Manual

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GB
6
The tilting pan automatically returns to its horizontal posi-
tion after a minute about and then it fills of water until the
selected level is reached.
In the meantime the hot gas valve il closes and the ice
formingcycle starts again; the time of a complete cycle
can vary from about 15’ to about 25’ according to water
and ambient temperature.
The ice quantity inside the bin is controlled through a ter-
mostat bulb fixed on one inside of the storage bin, when
the cubes of ice come in contact with the bulb, the pro-
duction of ice is automatically discontinued. Only after
enough ice has been removed from the storage bin so as
to free the bulb from the cubes, will the production
resume.
ELECTRICAL AND REFRIGERATION
SYSTEMS
The “N” series machines operate on standard electrical
supply 220 volts, 50 Hz, single phase. (The tolerance limit
is ± 6 % of the rated base). Special voltages are eventu-
ally on specific request.
Therefore, almways check nameplate for electrical infor-
mation before proceeding with electrical wiring connec-
tions to the ice-cubers.
The rifregerant expansion system on the cube machines
is the capillary. On N25S-N25L model the condensing unit
electric fan operates continuously during the ice forming
cycle and stops during the defrosting cycle, therefore the
head pressure change on different ambient temperatures.
While on N35S, N55S, N55L, N50BI, N70S, N90S, N90L,
N140 there is a pressure switch that starts and stops the
electric fan so to keep the head pressure constant. On
water-cooled versions the head pressure is kept constant
by means of an automatic valve that regulates the quanti-
ty of water cooling the condenser. (N45SW, N55SW,
M50BIW, N70SW, N90SW, 140W models)
On the smallest models instead, the head pressure is kept
constant by a pressure switch that opens and closes a
water inlet solenoid valve which supplies a metered
amdint of water to the condenser in order to limit its tem-
perature.
REFRIGERATING SYSTEM
A) Compressor
B) Eletric fan
C) Condenser
D) Drier
F) Hot gas valve
G) Evaporator
H) Heat exchanger