Operational Checks - Scotsman ACM 45 Service Manual

Page 11
NOTE . If in the 5 minutes length of the water
filling phase the machine sump reservoir
does not get filled with water up to the rim of
the overflow pipe, it is advisable to check:
1.The water pressure of the water supply line
that must be at least 1 bar (14 psig) Minimum
(Max 5 bar-70 psig).
2.The filtering device installed in the water
line that may reduce the water pressure
below the Minimum value of 1 bar (14 psig).
3. Any clogging situation in the water circuit
like the inlet water strainer and/or the flow
control.
E. At completion of the water filling phase
(5 minutes) the unit passes automatically into the
freezing cycle with the start up of:
COMPRESSOR
WATER PUMP
FAN MOTOR (in air cooled version)
and the glowing of the 6th RED LED (Fig.2).

OPERATIONAL CHECKS

F. Install, if necessary, the refrigerant service
gauges on both the high side and low side
Schräder valves to check the compressor head
and suction pressures.
FIG. 2
TEMPERATURE
SENSORI
SENSORS
EVAPORATOR
EVAPORATORE
CONTENITORE
BIN
L
N
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
SELECTOR
SELETTORE
TIMER
ELECTR.
TIMER
ELETTR.
FUSE
FUSIBILE
1
TRASFOR-
TRANSF.
2
MATORE
FUSE
FUSIBILE
FUSIBILE FUSE
NOTE. On air cooled models the head
(condensing) pressure is kept between 11
and 7 bars (155 and 100 psig) with ice
machine at 21 ° C (70 ° F) ambient temperatu-
re. The above mentioned head pressure
values change accordingly to the ambient
temperature (rising with the rise of the tem-
perature) and to the ventilation of the unit.
In the water cooled models, the head pressure
is kept between 8.5 and 10 bars (120-140
psig) by the operation of an automatic hi-
pressure control that energizes a second
outlet of the water inlet solenoid valve.
G. Check to see through the curtained ice
discharge opening that the spray system is
correctly seated and that the water jets uniformely
reach the interior of the inverted mold cups; also
make sure that the plastic curtain is hanging
freely and there is not excessive water spilling
through it.
H. The ice making process takes place thereby,
with the water sprayed into the molds that gets
gradually refrigerated by the heat exchange
occuring with the refrigerant flowing into the
evaporator serpentine.
VALVOLA SCARICO ACQUA
DIP
SWITCH
RELÈ
RELAY
3
4
RELAY RELÈ
5
6
RELÈ
RELAY
7
8
Page 11
WATER DRAIN VALVE
WATER IN VALVE
VALVOLA INGR. ACQUA
HOT GAS VALVE
VALVOLA GAS CALDO
WATER PUMP POMPA
VENTILATORE FAN MOTOR
COMPRESSORE COMPRESSOR