Page 1 Page 1

SERVICE MANUAL

ACM 45
ACM 55
R 134 A VERSION
Electronic cubers
with storage

MS 1000.04 REV. 06/2000

Page 2 Page 2

Table of contents page 2

INDICE Specifications ACM 45 3
Specifications ACM 55 5

GENERAL INFORMATION AND INSTALLATION

Introduction 7
Unpacking and Inspection 7
Location and levelling 7
Electrical connections 8
Water supply and drain connections 8
Final check list 8
Installation practice 9

OPERATING INSTRUCTIONS
Start up 10
Operational checks 11

OPERATING PRINCIPLES (How it works)

Freezing cycle 16
Harvest cycle 19
Control sequence 19
Component description 21

ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES

Adjustment of the cube size 25
Replacement of evaporator temperature sensor 26
Replacement of ice level control sensor 26
Replacement of P.C. BOARD 26
Replacement of the water pump 26
Replacement of water inlet solenoid valve 26
Replacement of water drain valve 27
Replacement of condenser water inlet solenoid valve (Water cooled models) 27
Replacement of hot gas valve coil 27
Replacement of fan motor 27
Replacement of plastic curtain 27
Replacement of spray platform and chute 28
Replacement of drier 28
Replacement of hot gas valve body 28
Replacement of evaporator platen 28
Replacement of air cooled condenser 28
Replacement of hi pressure control (Water cooled models) 29
Replacement of water cooled condenser 29
Replacement of compressor 29
Wiring diagram 30
Service diagnosis 31

MAINTENANCE AND CLEANING INSTRUCTIONS

General 33
Icemaker 33
Cleaning instructions of water system
Page 3 Page 3

SPECIFICATIONS

ELECTRONIC CUBER MODEL ACM 45

Important operating requirements:

MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 40°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%

ice making capacity

AIR COOLED MODELS WATER COOLED MODELS
Kg. °C
o Kg. °C
o

24 10 24 10
21
ICE PRODUCED PER 24 HRS.

23
ICE PRODUCED PER 24 HRS.

21 23
AMBIENT TEMPERATURE

AMBIENT TEMPERATURE

32
22 22 38

21 21

20 32 20

19 38 19

18 18

17 17

16 16

15 15
32 27 21 15 10 o°C 32 27 21 15 10 o°C
°C
°F
WATER TEMPERATURE WATER TEMPERATURE

NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature and age of the machine.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on page 33 of this manual.
Page 4 Page 4

SPECIFICATIONS

Dimensions:
HEIGHT 725 mm.
WIDTH 457 mm.
DEPTH 480 mm.
WEIGHT 39 Kgs.

ACM 45 - CUBER
machine specifications
Capacity Water req.
Model Cond. unit Finish Comp. HP the cold store lt/24 HR

ACM 45 AS 6 Air 100*

Stainless steel 1/4 14 Kg.
ACM 45 WS 6 Water 270*

Basic electr. Amps Start .

Watts Electric power cons. Nr. of wires Amps fuse
Amps Kwh per 24 Hr

230/50/1 2.2 11 340 6.5 3 x 1.5 mm2 10

Cubes per harvest: 18 medium

* A 15°C water temperature
Page 5 Page 5

SPECIFICATIONS

ELECTRONIC CUBER MODEL ACM 55

Important operating requirements:

MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 40°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%

ice making capacity

AIR COOLED MODELS WATER COOLED MODELS
Kg. °C
o Kg. °C
o
ICE PRODUCED PER 24 HRS.

ICE PRODUCED PER 24 HRS.

32 32
AMBIENT TEMPERATURE

AMBIENT TEMPERATURE

10 10
30 30 21
21
32
28 28 38

26 26
32
24 38 24

22 22

20 20

18 18
32 27 21 15 10 o°C 32 27 21 15 10 o°C

WATER TEMPERATURE WATER TEMPERATURE

°C
°F

NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature and age of the machine.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on page 33 of this manual.
Page 6 Page 6

SPECIFICATIONS

Dimensions:
HEIGHT 738 mm.
WIDTH 457 mm.
DEPTH 522 mm.
WEIGHT 44 Kgs.

ACM 55 - CUBER
machine specifications
Capacity Water req.
Model Cond. unit Finish Comp. HP the cold store lt/24 HR

ACM 55 AS 6 Air 0110 **

Stainless steel 1/4 14 Kg.
ACM 55 WS 6 Water 290*

Basic electr. Amps Start .

Watts Electric power cons. Nr. of wires Amps fuse
Amps Kwh per 24 Hr

230/50/1 2.2 11 390 7 3 x 1.5 mm2 10

Cubes per harvest: 24 medium

* A 15°C water temperature
Page 7 Page 7

GENERAL INFORMATION AND INSTALLATION

A. INTRODUCTION 9. See data plate on the rear side of the unit

and check that local main voltage corresponds
This manual provides the specifications and the with the voltage specified on it.
step-by-step procedures for the installation, start-
up and operation, maintenance and cleaning for
the SCOTSMAN ACM 45 and ACM 55 icemakers. CAUTION. Incorrect voltage supplied to
The Electronic Cubers are quality designed, the icemaker will void your parts
engineered and manufactured. replacement program.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user. 10. Remove the manufacturer’s registration
This product qualifies for the following listings: card from the inside of the User Manual and fill-
These icemakers have been engineered to our in all parts including: Model and Serial Number
own rigid safety and performance standards. taken from the data plate.
Forward the completed self-addressed
registration card to Frimont factory.
NOTE. To retain the safety and performance
built into this icemaker, it is important that 11. On ACM 55, if necessary, fit the four legs
installation and maintenance be conducted into their seats on the machine base and adjust
in the manner outlined in this manual. them to the desired level.

C. LOCATION AND LEVELLING

B. UNPACKING AND INSPECTION

1. Call your authorized SCOTSMAN Distributor WARNING. This Ice Cuber is designed for
or Dealer for proper installation. indoor installation only. Extended periods
of operation at temperatures exceeding
2. Visually inspect the exterior of the packing the following limitations will constitute
and skid. Any severe damage noted should be misuse under the terms of the SCOTSMAN
reported to the delivering carrier and a concealed Manufacturer’s Limited Warranty resulting
damage claim form filled in subjet to inspection of in LOSS of warranty coverage.
the contents with the carrier’s representative
present.
1. Position the unit in the selected permanent
3. a) Cut and remove the plastic strip securing location.
the carton box to the skid. Criteria for selection of location include:
a) Minimum room temperature 10°C (50°F)
b) Remove the packing nails securing the and maximum room temperature 40°C (100°F).
carton box to the skid. b) Water inlet temperatures: minimum 5°C
(40°F) and maximum 40°C (100°F).
c) Cut open the top of the carton and remove c) Well ventilated location for air cooled
the polystyre protection sheet. models.
d) Pull out the polystyre posts from the d) Service access: adequate space must
corners and then remove the carton. be left for all service connections through the rear
of the ice maker. A minimum clearance of 15 cm
4. Remove the rear panel of the unit and (6") must be left at the sides of the unit for routing
inspect for any concealed damage. Notify carrier cooling air drawn into and exhausted out of the
of your claim for the concealed damage as steted compartment to maintain proper condensing
in step 2 above. operation of air cooled models.

5. Remove all internal support packing and 2. Level the unit in both the left to right and
masking tape. front to rear directions.
6. Check that refrigerant lines do not rub
against or touch other lines or surfaces, and that
the fan blade moves freely.
7. Check that the compressor fits snugly onto D. ELECTRICAL CONNECTIONS
all its mounting pads.
See data plate for current requirements to
8. Use clean damp cloth to wipe the surfaces determine wire size to be used for electrical
inside the storage bin and the outside of the connections. All SCOTSMAN icemakers require
cabinet. a solid earth wire.
Page 8 Page 8

All SCOTSMAN ice machines are supplied from WATER DRAIN

the factory completely pre-wired and require only
electrical power connections to the wire cord The recommended drain tube is a plastic or
provided at rear of the unit. flexible tube with 18 mm (3/4") I.D. which runs to
Make sure that the ice machine is connected to an open trapped and vented drain. When the
its own circuit and individually fused (see data drain is a long run, allow 3 cm pitch per meter
plate for fuse size). (1/4" pitch per foot).
A vent at the unit drain connection is also required
The maximum allowable voltage variation should
for proper sump drainage.
not exceed -10% and + 10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to
the overload switch and motor windings. WATER DRAIN - WATER COLLED MODELS

Connect the 3/4" male fitting of the condenser

NOTE. All external wiring should conform to water drain, utilizing a second flexible tubing or a
national, state and local standards and 3/8" O.D. copper tubing, to the open trapped and
regulations. vented drain.

Check voltage on the line and the ice maker’s NOTE. The water supply and the water drain
data plate before connecting the unit. must be installed to conform with the local
code. In some case a licensed plumber and/
or a plumbing permit is required.

E. WATER SUPPLY AND DRAIN

CONNECTIONS
F. FINAL CHECK LIST
GENERAL
1. Is the unit in a room where ambient
When choosing the water supply for the ice cuber temperatures are within a minimum of 10°C
consideration should be given to: (50°F) even in winter months?
a) Length of run
b) Water clarity and purity 2. Is there at least a 15 cm (6") clearance
c) Adequate water supply pressure around the unit for proper air circulation?
Since water is the most important single ingredient
in producting ice you cannot emphasize too 3. Is the unit level? (IMPORTANT)
much the three items listed above.
Low water pressure, below 1 bar may cause 4. Have all the electrical and plumbing
malfunction of the ice maker unit. connections been made, and is the water supply
Water containing excessive minerals will tend to shut-off valve open?
produce cloudy coloured ice cubes, plus scale
build-up on parts of the water system. 5. Has the voltage been tested and checked
against the data plate rating?

6. Has the water supply pressure been

WATER SUPPLY checked to ensure a water pressure of at least
1 bar (14 psi).
Connect the 3/4" male fitting of the solenoid
water inlet valve, using a food grade flexible tube 7. Check all refrigerant lines and conduit lines
or a 3/8" O.D. copper pipe, to the cold water to guard against vibrations and possible failure.
supply line with regular plumbing fitting and a
shut-off valve installed in an accessible position 8. Have the bolts holding the compressor down
between the water supply line and the unit. been checked to ensure that the compressor is
If water contains a high level of impurities, it is snugly fitted onto the mounting pads?
advisable to consider the use of the Water Drain
Valve - or the installation of an appropriate water
filter or conditioner. 9. Have the bin liner and cabinet been wiped
clean?
On Water Cooled version the water inlet solenoid
valve has two separate outhets one for the 10. Has the owner/user been given the User
condenser and the second for the production of Manual and been instructed on the importance of
ice. periodic maintenance checks?
Page 9 Page 9

11. Has the Manufacturer’s registration card 12. Has the owner been given the name and
been filled in properly? Check for correct model the phone number of the authorized SCOTSMAN
and serial number against the serial plate and Service Agency serving him?
mail the registration card to the factory.

G. INSTALLATION PRACTICE

1. Hand shut-off valve

2. Water filter
3. Water supply line (flexible hose)
4. 3/4" male fitting
5. Vented drain
6. Open trapped vented drain
7. Drain fitting
8. Main switch
9. Power line

WARNING. This icemaker is not designed for outdoor installation and will not function in
ambient temperatures below 10°C (50°F) or above 40°C (100°F).
This icemaker will malfunction with water temperatures below 5°C (40°F) or above 40°C
(100°F).
Page 10 Page 10

OPERATING INSTRUCTIONS

Start up
NOTE. Every time the unit returns under
After having correctly installed the ice maker and power, after having been switched off, the
completed the plumbing and electrical water inlet valve, the hot gas valve and the
connections, perform the following “Start-up” water drain valve get energized for a period
procedure. of 5 minutes, thus to admit new water to the
machine sump reservoir to fill it up and,
A. Remove the rear panel, locate the control eventually, to wash-off any dirt that can have
box and remove its cover. deposited in it during the unit off period
(Fig.1).
B. Locate the grooved head (similar to a fillister
screw head) of the electronic program selector
and with the help of a regular screwdriver turn the D. During the water filling operation, check to
selector head in the OPERATION position. see that the incoming water dribbles, through the
evaporator platen dribbler holes, down into the
sump reservoir to fill it up and also that the
incoming surplus of water flows out through the
overflow pipe into the drain line.
During the water filling phase the components
energized are:
C. Give power to the unit to start it up by THE WATER INLET SOLENOID VALVE
switching “ON” the power line main disconnect
switch. THE HOT GAS SOLENOID VALVE
The 1st GREEN LED will glow. THE WATER DRAIN SOLENOID VALVE

FIG. 1

WATER SCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
SWITCH VALVOLA
WATERINGR. ACQUA
IN VALVE

EVAPORATORE
EVAPORATOR SELECTOR
SELETTORE
ELECTR.
TIMER RELÈ
RELAY
TIMER
ELETTR. HOT GAS
VALVOLA GASVALVE
CALDO
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

POMPA
WATER PUMP

RELAY
RELÈ
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSOR
COMPRESSORE
FUSIBILE
FUSE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 11 Page 11

NOTE. If in the 5 minutes length of the water NOTE. On air cooled models the head
filling phase the machine sump reservoir (condensing) pressure is kept between 11
does not get filled with water up to the rim of and 7 bars (155 and 100 psig) with ice
the overflow pipe, it is advisable to check: machine at 21°C (70°F) ambient temperatu-
1.The water pressure of the water supply line re. The above mentioned head pressure
that must be at least 1 bar (14 psig) Minimum values change accordingly to the ambient
(Max 5 bar-70 psig). temperature (rising with the rise of the tem-
2.The filtering device installed in the water perature) and to the ventilation of the unit.
line that may reduce the water pressure In the water cooled models, the head pressure
below the Minimum value of 1 bar (14 psig). is kept between 8.5 and 10 bars (120-140
psig) by the operation of an automatic hi-
3. Any clogging situation in the water circuit pressure control that energizes a second
like the inlet water strainer and/or the flow outlet of the water inlet solenoid valve.
control.

E. At completion of the water filling phase G. Check to see through the curtained ice
(5 minutes) the unit passes automatically into the discharge opening that the spray system is
freezing cycle with the start up of: correctly seated and that the water jets uniformely
COMPRESSOR reach the interior of the inverted mold cups; also
make sure that the plastic curtain is hanging
WATER PUMP freely and there is not excessive water spilling
FAN MOTOR (in air cooled version) through it.
and the glowing of the 6th RED LED (Fig.2).

OPERATIONAL CHECKS H. The ice making process takes place thereby,

with the water sprayed into the molds that gets
F. Install, if necessary, the refrigerant service gradually refrigerated by the heat exchange
gauges on both the high side and low side occuring with the refrigerant flowing into the
Schräder valves to check the compressor head evaporator serpentine.
and suction pressures.

FIG. 2

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
WATERINGR.
VALVOLA IN VALVE
ACQUA
SWITCH
EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE
TIMER
ELECTR. RELÈ
RELAY
TIMER
ELETTR. HOT GAS
VALVOLA GASVALVE
CALDO
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

POMPA
WATER PUMP

RELÈ
RELAY
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELÈ
RELAY
COMPRESSORE
COMPRESSOR
FUSE
FUSIBILE 7
FUSE
FUSIBILE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 12 Page 12

During the freezing process, when the evaporator power signal to the electronic control device
temperature falls to reach 0°C (32°F) the evaporator (P.C.BOARD) which in first instance generates
temperature sensor, located in contact with the the glowing of the 5th RED LED located in the
evaporator serpentine, supplies a low voltage front of the printed circuit board (Fig.3).

FIG. 3

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
SWITCH WATERINGR.
VALVOLA IN VALVE
ACQUA
EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE RELAY
RELÈ
ELECTR.
TIMER
TIMER
ELETTR. HOT GAS
VALVOLA GASVALVE
CALDO
–2° C 3
CONTENITORE
BIN PROCESSOR
PROCESSORE 4
DATA
MICRO-

WATER PUMP
POMPA

RELAY
RELÈ
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSOR
COMPRESSORE
FUSIBILE
FUSE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD

FIG. 4

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
SWITCH WATERINGR.
VALVOLA IN VALVE
ACQUA
EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE RELAY
RELÈ
TIMER
ELECTR.
ELETTR.
TIMER HOT GAS
VALVOLA GASVALVE
CALDO
–13° C 3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

WATER PUMP
POMPA

RELAY
RELÈ
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSOR
COMPRESSORE
FUSIBILE
FUSE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 13 Page 13

I. The unit remains however in its normal

freezing cycle mode untill the evaporator tempe- The third time Ta - Time added - is in relation
rature detected by the sensor reaches the tem- to one of the different combinations of the five
perature of -13°C (8.5°F). keys 3, 4, 5, 6 AND 7 of the DIP SWITCH
When the evaporator temperature falls below located in the front of the P.C.BOARD. The
the above value, the evaporator temperature combination is factory set in consideration of
sensor supplies a low voltage power signal to the the ice maker type and of its cooling version.
P.C.BOARD in order to activate the electronic It is possible, however, to vary the timed
timer. This one takes over the control of the length of the freezing cycle, by changing the
freezing cycle up to the complete formation of the DIP SWITCH keys settings.
ice cubes (Fig.4) with the lighting up of the 4th In Table C of PRINCIPLE OF OPERATION
RED LED located just above the previous lighted are shown the various time extensions of the
one. freezing cycle third phase Ta, in relation with
the different DIP SWITCH keys settings.

NOTE. The length of the entire freezing cycle J. After about 20-22 minutes from the
is the sum of the lengths of three phases, beginning of the freezing cycle, in an hypothetic
two of which, (T1+T2) controlled by the ambient temperature of 21°C (70°F), the defrost
evaporator temperature sensor, which has cycle takes place with the hot gas and the water
its probe placed in contact with the evaporator inlet valves being simoultaneously activated
serpentine (Non adjustable), and one (Ta) (Fig.5).
by the electronic timer (Adjustable) The electrical components in operation in this
incorporated in the P.C.BOARD. new situation are:
The lengths of the first two phases, related to COMPRESSOR
the evaporator temperature and controlled WATER INLET SOLENOID VALVE
by its sensor, are:
T1 - The time elapsed since the beginning of HOT GAS VALVE
freezing cycle up to when the evaporator WATER DRAIN SOLENOID VALVE
reaches the temperature of 0°C (32¯F).
T2 - The time required for the evaporator to and the
fall from 0°C (32°F) to -13°C (8.5°F). WATER PUMP and FAN MOTOR for the first
15 - 20 seconds

FIG. 5

VALVOLA
WATER SCARICO ACQUA
DRAIN VALVE

SENSORI
TEMPERATURE
SENSORS DIP
SWITCH VALVOLA
WATERINGR. ACQUA
IN VALVE

EVAPORATORE
EVAPORATOR SELETTORE
SELECTOR RELÈ
TIMER RELAY
ELECTR.
ELETTR.
TIMER VALVOLA GAS
HOT GAS CALDO
VALVE
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

WATER PUMP
POMPA

RELÈ
RELAY
VENTILATORE
FAN MOTOR
L 1 FUSIBILE
FUSE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSORE
COMPRESSOR
FUSIBILE
FUSE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 14 Page 14

If the ice cubes require a correction of their

NOTE. The length of the defrost cycle (not
shape, it is possible to modify the length of the
adjustable) is automatically determinated by
timed freezing cycle by changing the DIP
the micro processor of P.C.BOARD in relation
of the time T2 necessary for the unit to SWITCH keys setting as illustrated on table C
reduce the evaporator temperature from 0°C shown in OPERATING PRINCIPLE.
(32°F) to -13°C (8.5°F) and of the ambient If the ice cubes are shallow and cloudy, it is
temperature, as illustrated in Table B of possible that the ice maker runs short of water
PRINCIPLE OF OPERATION. during the freezing cycle second phase or, the
As shown it is possible to have a different quality of the supplied water requires the use of
length of the defrost cycle in connection with an appropriate water filter or conditioner.
the different length of the second phase of
the freezing cycle T2 related to the ambient
temperature situations; shorter when the
ambient temperature is high and longer in M. To be sure of the correct operation of ice
colder ambients so to partially compensate level temperature sensor located in one side of
the length of the freezing cycle, which is storage bin liner, place one shovel of ice cubes
longer in high ambient temperatures and in contact with its probe for approx. 30 sec.
shorter in low ones. 1 minute.
As the temperature of storage bin sensor reaches
the value of +2°C (35°F), the ice level control
transmits a signal to the micro processor of the
K. Check, during the defrost cycle, that the P.C. BOARD in order to stop the ice maker
incoming water flows correctly into the sump operation with the simultaneous glowing of the
reservoir in order to refill it and that its surplus 3rd RED LIGHT, to monitor the BIN FULL
overflows through the overflow drain tube. situation (Fig.6).
With no more ice cubes in touch with the ice level
L. Check the texture of ice cubes just released. control the temperature of its probe progressively
They have to be in the right shape with a small rises to reach +4.5°C (40°F) and at this point the
depression of about 5-6 mm in their crown. ice machine restarts to initiate a new freezing
If not, wait for the completion of the second cycle cycle with the simultaneous extinguishing of the
before performing any adjustment. 3rd RED LIGHT.

FIG. 6

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP WATERINGR.
IN VALVE
SWITCH VALVOLA ACQUA

EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE RELAY
RELÈ
TIMER
ELECTR.
TIMER
ELETTR. HOT GAS
VALVOLA VALVE
GAS CALDO
3
CONTENITORE
BIN
4
PROCESSOR
PROCESSORE
DATA
MICRO-

WATER PUMP
POMPA

RELAY
RELÈ
FAN MOTOR
VENTILATORE
FUSE
FUSIBILE
L 1 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSOR
COMPRESSORE
FUSE
FUSIBILE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 15 Page 15

N. Remove the refrigerant service gauges and

NOTE. The CUT-IN RANGE OF THE ICE re-fit the control box cover and the unit service
LEVEL CONTROL SENSOR can be adjusted panels previously removed.
by means of the DIP SWITCH keys 8 and 9
as shown on table D of PRINCIPLE OF
OPERATION; its cut out setting remains O. Instruct the owner/user on the general
however at +2°C (35°F). operation of the ice machine and about the
cleaning and care it requires.
Page 16 Page 16

PRINCIPLE OF OPERATION

How it works exchanges heat with the refrigerant flowing into

In the SCOTSMAN cube ice makers the water the capillary tube (warmer), before to be sucked
used to make the ice is kept constantly in in the compressor and to be recirculated as hot
circulation by an electric water pump which primes compressed refrigerant gas.
it to the spray system nozzles from where it is The freezing cycle is controlled by the evaporator
diverted into the inverted mold cups of the temperature sensor (which has its probe in contact
evaporator (Fig. A). with the evaporator serpentine) that determines
A small quantity of the sprayed water freezes the length of the first and second portion of it; the
into ice; the rest of it cascades by gravity into the starts up of the freezing cycle is signalled by the
sump assembly below for recirculation. glowing of the 6th RED LED.
The first portion length or time T1 (Not adjustable)
is equal to the time required by the temperature
FREEZING CYCLE sensor to fall to 0°C (32°F). When reached, it is
signalled by the glowing of the 5th RED LED.
The hot gas refrigerant discharged out from the
compressor (Fig. B) reaches the condenser
where, being cooled down, condenses into liquid. NOTE. If, after 15 minutes, the evaporator
Flowing into the liquid line it passes through the temperature has not yet reached the value of
drier filter, then it goes all the way through the 0°C (32°F) ( due to a partially or total shortage
capillary tube where, due to the heat exchanging of refrigerant or to a too high condensing
action, it looses some of its heat content so that temperature, etc.) the sensor, through the
its pressure and temperature are lowered as P.C. BOARD, causes the unit to stop the
well. Next the refrigerant enters into the operation with the simoultaneous glowing of
evaporator serpentine (which has a larger I.D. the 2nd RED WARNING LED (Fig. 7).
then the capillary) and starts to boil off; this After having eliminated the source of the unit
reaction is emphasized by the heat transferred trip off, to restart the machine operation it is
by the sprayed water. necessary first to rotate the program selector
The refrigerant then increases in volume and on RE-SET position, then put it again on to
changes entirely into vapor. OPERATION position or, alternatively, switch
The vapor refrigerant then passes through the OFF and ON the hand disconnect Main
suction accumulator (used to prevent that any Switch.
small amount of liquid refrigerant may reach the The ice machine resumes its normal operation
compressor) and through the suction line. In by going through the 5 minutes water filling
both the accumulator and the suction line it phase.

FIG. 7

WATER DRAIN
VALVOLA VALVE
SCARICO ACQUA

SENSORI
TEMPERATURE
SENSORS DIP
SWITCH VALVOLA
WATERINGR. ACQUA
IN VALVE

EVAPORATORE
EVAPORATOR SELECTOR
SELETTORE
TIMER
ELECTR. RELÈ
RELAY
ELETTR.
TIMER HOT GAS
VALVOLA VALVE
GAS CALDO
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

POMPA
WATER PUMP

RELÈ
RELAY
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELÈ
RELAY
COMPRESSOR
COMPRESSORE
FUSE
FUSIBILE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
 Page 17 Page 17

FIG. A FIG. B

FIG. C FIG.D
Page 18 Page 18

The second portion length of freezing cycle or On the air cooled versions the refrigerant head
time T2 (Not adjustable) is equal to the time pressure is gradually reduced from a value of
required by the evaporator temperature to go approx. 11 bars (155 psig), generally recorded
from 0°C (32°F) to -13°C (8.5°F). The sensor will at the beginning of the freezing cycle with the unit
light-up the 4th RED LED. at 21°C (70°F) ambient temperature, to a minimun
value of approx. 7 bars (100 psig) just at the end
of the freezing cycle few seconds before the
NOTE. In case the time T2 gets longer than starting of the defrost cycle.
45 minutes, the unit stops with the glowing of The declining of the pressure is subordinated to
the 2nd RED WARNING LED. the reduction of the evaporating pressure, caused
by the progressive growth of the ice thickness
The third portion or time Ta (Added time) of the into the inverted cup molds and to the flow of air
freezing cycle is controlled by the electronic timer drown through the air cooled condenser by the
of P.C. BOARD. As the evaporator temperature fan motor.
reaches the value of -13°C (8.5°F); the sensing The above values are in relation as well to the
probe of the evaporator sensor (in contact with ambient temperature of the ice maker site and
the serpentine) changhes its electrical resistance they are subject to rise with the increase of this
causing a low voltage current to flow to the P.C. temperature.
BOARD which, thereby, activates an electronic On the water cooled versions the refrigerant
timer. head pressure ranges between 8.5 and 10.5
bars (120÷140 psig) being controlled by the
NOTE. The activation of the timer (Time automatic hi pressure control that energizes a
mode) of P.C. BOARD is signalled by the water solenoid valve located on the inlet water
glowing of 4th RED LED located in the front line to the condenser, which modulates the cooling
of the P.C. BOARD. water rate to the condenser.

NOTE. In case the length of the first portion

ATTENTION. In case the length of the of freezing cycle T1 or of the second portion
second portion of freezing cycle or time T2 gets longer respectively than 15 and 45
T2, lasts as long as between 35 and 45 minutes for one of the following abnormal
minutes, the third portion or time Ta gets reasons:
skipped by the P.C. BOARD which puts CLOGGED CONDENSER (Air cooled
the unit directly in the defrost or harvest version)
cycle. INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
FAN MOTOR OUT OF OPERATION (Air
The length of the third portion of the freezing cooled version)
cycle (adjustable) is pre-fixed and related to the AMBIENT TEMPERATURE HIGHER THAN
setting of the DIP SWITCH keys 3, 4, 5, 6 and 7. 40°C (100°F)
In Table C are indicated the various lengths of the the Micro Processor of the P.C. BOARD
third portion of freezing cycle (Time mode) in causes the total and immediate SHUT-OFF of
accordance with the different combinations of the machine in order to prevent the unit from
the DIP SWITCH KEYS. In Table A, herebelow operating in abnormal and dangerous
illustrated, are indicated the DIP SWITCH keys conditions. When the ice maker stops on
combinations for the ACM 45 and ACM 55 at account of this protective device, there is a
different versions as they are set in the factory. simultaneous glowing of the 2nd RED LED,
The electrical components in operation during warning the user of the abnormal situation.
the freezing cycle are: Once eliminated the source of the condenser
COMPRESSOR hi-temperature, to restart the machine first, it
FAN MOTOR (in air cooled version) is necessary to rotate for a while the program
selector on RE-SET position then, rotate it
WATER PUMP again on OPERATION position or alternatively
and during the timed phase of freezing cycle switch OFF and ON the unit power line Main
(Time mode) they are joined by the Switch. The ice machine resumes its normal
ELECTRONIC TIMER operation by going through the usual 5 minutes
water filling phase.

TAB. A DIP SWITCH KEYS FACTORY SETTING COMBINATIONS

PER MODEL AND VERSION
DIP SWITCH 1 2 3 4 5 6 7 8 9 10
ACM 45 A & W ON OFF OFF OFF OFF ON ON OFF OFF ON
ACM 55 A & W ON OFF OFF ON ON OFF ON OFF OFF OFF
Page 19 Page 19

With the unit installed in a normal location (21°C

ambient temperature) at the start of the freezing NOTE. The length of the defrost cycle (not
cycle the refrigerant suction or lo-pressure lowers adjustable) changes in accordance with the
rapidly to 1.0÷0.9 bars (14÷12 psig) then it duration of the second portion of the freezing
declines gradually - in relation with the growing of cycle T2 and is related as well to the ambient
the ice thickness - to reach, at the end of the temperature (as shown on Table B). Infact in
cycle, approx. 0÷0.1 bars (0÷1.5 psig) with the high ambient temperature situation the defrost
cubes fully formed in the cup molds. cycle is abbreviated so to recover some of
The total length of the freezing cycle ranges from the time used for the longer freezing cycle.
20 to 22 minutes.

At the end of the defrost cycle, both the hot gas

and the water inlet valves close and the machine
starts again a new freezing cycle.
DEFROST OR HARVEST CYCLE
As the electronic timer has carried the system
throughout the third phase of freezing cycle or as
soon as the second phase T2 is over (when its
length has been as long as 35 to 45 minutes) the OPERATION - CONTROL SEQUENCE
defrost cycle starts.
At the start of freezing cycle the evaporator
temperature sensor controls the length of the
NOTE. The length of the defrost cycle (not first T1 and second T2 portion of the freezing
adjustable) is related to the length of the cycle. As it senses the predetermined evaporating
second phase of freezing cycle T2 as detailed temperature of -13°C (8.5°F) it supplies a low
in Table B. voltage current to the P.C. BOARD in order to
activate the electronic timer which takes over
the control of the remaining portion of the freezing
cycle for a pre-fixed time Ta subordinated to the
The electrical components in operation during DIP SWITCH keys setting (see Tab. C).
this phase are:
COMPRESSOR
WATER INLET SOLENOID VALVE NOTE. The evaporator temperature
HOT GAS SOLENOID VALVE sensor,factory pre-set, is the same for all the
models and is not adjustable in the field.
WATER DRAIN SOLENOID VALVE
WATER PUMP and FAN MOTOR for the first
15-20 seconds During the normal operation mode the length or
the total time of the freezing cycle ie equal to the
The incoming water, passing through the water sum of the three partial times i.e.:
inlet valve and its flow control (Fig. C) runs over Tc = T1 + T2 + Ta
the evaporator platen and then flows by gravity
through the dribbler holes down into the sump/ In case the length of the second portion of the
reservoir. freezing cycle or time T2 gets long as to be
The water filling the sump/reservoir forces part of between 35 and 45 minutes, the total length of
the surplus water from the previous freezing the freezing cycle will be limited to:
cycle to go out to the waste through the overflow Tc = T1 + T2
pipe. This overflow limits the level of the sump
water which will be used to produce the next skipping the added time Ta, controlled by the
batch of ice cubes. electronic timer.
Meanwhile, the refrigerant as hot gas, discharged If instead the time T2 gets longer than 45 minutes
from the compressor (Fig. D) flows through the the unit stops immediately with the lighting up of
hot gas valve directly into the evaporator the warning 2nd RED LIGHT.
serpentine by-passing the condenser. The same could happen in case the time T1
The hot gas circulating into the serpentine of the (1st portion of freezing cycle) gets longer than
evaporator warms up the copper molds causing 15 minutes.
the defrost of the ice cubes. The ice cubes, Once completed the freezing cycle 2nd or 3rd
released from the cups, drop by gravity onto a phase (this last one is dependent of the length of
slanted cube chute, then through a curtained the second phase of freezing cycle - T2) the
opening they fall into the storage bin. system goes automatically into the defrost cycle
On the versions equipped with the water drain Ts.
valve, the water pump remains in operation, The defrost cycle also has a pre-fixed length that
during the first 15-20 seconds of the defrost can vary in relation to the time T2, as shown in
cycle, to pump out, trough the opened water Table B.
drain valve, the remaining water (reach of minerals At completion of the defrost cycle the P.C. BOARD
and deposits) of the previous freezing cycle. put the unit into a new freezing cycle.
Page 20 Page 20

OPERATION - ELECTRICAL SEQUENCE HARVEST (Time Ts)

The following charts illustrate which switches Water Drain Phase (15-20 sec.)
and which components are ON or OFF during a
particular phase of the icemaking cycle.
Refer to the wiring diagram for a reference.
Electrical components (Loads) .... ON OFF
Compressor ..................................... •
Water Pump .................................... •
Fan Motor (Air cooled only) ............. •
BEGINNING FREEZE (Time T1 and T2) Hot Gas Valve ................................. •
Water Inlet Valve ............................. •
Electrical components (Loads) .... ON OFF Water Drain Valve ........................... •
Compressor ..................................... • P.C.Board Relay 1 & 3 Coil ............. •
Water Pump .................................... • P.C.Board Relay 2 Coil ................... •
Fan Motor (Air cooled only) ............. • Electronic Timer .............................. •
Hot Gas Valve ................................. •
Water Inlet Valve ............................. •
Water Drain Valve ........................... •
P.C.Board Relay 1 Coil ................... • Electronic Controls & Sensors .... ON OFF

P.C.Board Relay 2 & 3 Coil ............. • Evaporator Sensor .......................... •

Electronic Timer .............................. • Ice Level Sensor ............................. •

Electronic Controls & Sensors .... ON OFF

Evaporator Sensor .......................... •

Ice Level Sensor ............................. •
HARVEST (Time Ts)
Water Filling Phase

TIMED FREEZE (Time Ta) Electrical components (Loads) .... ON OFF

Compressor ..................................... •
Electrical components (Loads) .... ON OFF
Water Pump .................................... •
Compressor ..................................... •
Water Pump .................................... • Fan Motor (Air cooled only) ............. •
Fan Motor (Air cooled only) ............. • Hot Gas Valve ................................. •
Hot Gas Valve ................................. • Water Inlet Valve ............................. •
Water Inlet Valve ............................. • Water Drain Valve ........................... •
Water Drain Valve ........................... • P.C.Board Relay 1 & 3 Coil ............. •
P.C.Board Relay 1 Coil ................... • P.C.Board Relay 2 Coil ................... •
P.C.Board Relay 2 & 3 Coil ............. •
Electronic Timer .............................. •
Electronic Timer .............................. •

Electronic Controls & Sensors .... ON OFF Electronic Controls & Sensors .... ON OFF
Evaporator Sensor .......................... • Evaporator Sensor .......................... •
Ice Level Sensor ............................. • Ice Level Sensor ............................. •
Page 21 Page 21

OPERATING CHARACTERISTICS COMPONENTS DESCRIPTION

On air cooled models, during the freezing cycle, A. EVAPORATOR TEMPERATURE

the discharge pressure will slowly decline as the SENSOR
unit freezes ice and at the same time the suction
pressure will also decline, reaching its lowest The evaporator temperature sensor probe,
point just before harvest. Compressor amps located in contact with the evaporator serpentine,
experience a similar drop. detects the dropping of the evaporator tempera-
On water cooled models, the discharge pressure ture during the freezing cycle and signals it by
is maintened during the freeze cycle between 8.5 supplying a current flow to the Micro Processor of
and 10 bars (120÷140 psig) by the combination P.C. BOARD.
of a pressure control and a water inlet solenoid According to the current signal and to after how
long this is received, the Micro Processor may or
valve. However, suction pressure and compressor not give the consent to the ice maker to complete
amps will still decline as the machine freezes ice. the freezing cycle.
The low voltage current transmitted, from the
evaporator temperature sensor to the P.C.
BOARD, is signalled by the lighting up of the
Freeze Cycle fourth (Time T1) and fifth (Time T2) RED LED
placed in the front of the P.C. BOARD to inform
Average Discharge Pressure the service engineer, of the normal (regular)
A/C: 7÷11 bars (100÷155 psig) progressing of the freezing cycle.

Average Discharge Pressure

W/C: 8.5÷10 bars (120÷140 psig) B. ICE BIN LEVEL SENSOR

The ice bin level temperature sensor, secured to

one of the storage bin walls, stops the operation
Suction Pressure of the entire ice maker only at the end of the
End Freeze Cycle: 0÷0.1 bar (0÷1.5 psig) defrost cycle when its sensing probe (in contact
with the stored ice) reaches the temperature of
+2°C (35°F) lighting up, in the meantime, the
third RED LED.
Once the ice is removed from the sensing probe,
REFRIGERANT METERING DEVICE: its temperature progressively rise up and as it
capillary tube reaches the value of +4.5°C (40°F) the ice bin
level temperature sensor transmits a low voltage
current flow to the P.C. BOARD so to restart the
operation of the unit.

REFRIGERANT CHARGE (R 134 A)

Model Air Cooled Water Cooled NOTE. The ice maker, after the interruption
of its operation due to the ice level control
ACM 45 250 gr (9.0 oz) 250 gr (9.0 oz) cut-out always restarts from the beginnig of
ACM 55 260 gr (9.3 oz) 250 gr (9.0 oz) the freezing cycle.

By changing the combination of the DIP SWITCH

Keys number 8 and 9 it is possible to change the
range of the ice level control temperature sensor.
This is shown on table D, keeping its cut out
temperature always at +2°C (35°F).

C. P.C. BOARD (Data processor)

The P.C. BOARD, fitted in its plastic box located

in the front of the unit, consists of two separated
printed circuits one at high and the other at low
voltage integrated with a program selector; of six
aligned LEDS monitoring to the service engineer
the operation of the machine; of one DIP SWITCH
with ten keys; of input terminals for the leads of
the two sensor probes and of input and output
terminals for the leads of the ice maker electrical
wires.
Page 22 Page 22

The P.C. BOARD is the brain of the system and The Micro Processor of the P.C. BOARD has
it elaborates, through its Micro Processor, the also the important function to establish the length
signals received from the two sensors in order to of the defrost cycle Ts in relation with the duration
control the operation of the different electrical of the second phase of the freezing cycle or time
components of the ice maker (compressor, water T2 as shown on table B.
pump, solenoid valves, etc.).
By turning the program selector it is possible to
put the unit in the following different situations:

CLEANING/RINSING. The water pump is the D. DIP SWITCH

only electrical component in operation and it
must be used during the cleaning or the rinsing The P.C.BOARD which controls the entire
procedure of the water system of ice machine. operation of the ice maker, has a DIP SWITCH
STAND BY. The unit remain under electrical with ten switching keys which allow to set up
power but OUT of operation. It can be used by the the micro processor program in order to extend
service engineer in order to stop the unit during or to shorten the length of freezing cycle in
the service and inspection operations. relation to the different models and versions of
ice machines and to modify the sensing range of
the ice bin level temperature sensor.
IN OPERATION. The unit is running through the
freezing and defrost cycles stopping automatically
only at full bin situation. The 1st DIP SWITCH key is used to supply
power to the water pump during the first 15-20
seconds of the defrost cycle to pump out all
RE-SET. To be selected to resume the unit remaining water from the sump tank when is set
operation when the ice maker shuts off due to the to ON position.
intervention of the security of the P.C. BOARD in
relation to the exceeding time of freezing cycle
portion T1 and T2. The 2nd DIP SWITCH key allows to make a
rapid check up (auto-diagnosis) of the P.C.
BOARD output connections (compressor, water
The six LEDS (not visibles trough the panel) pump, fan motor, water inlet and hot gas solenoid
placed in a vertical row in the front of the P.C. valves) energizing them in rapid sequence (2
BOARD, monitor, from the top to the bottom, the seconds) one by one.
following situations:
DURING THE AUTOMATIC OPERATION OF
GREEN LIGHT Unit under electrical power THE ICE MAKER THIS KEY MUST BE SET IN
OFF POSITION.
RED LIGHT Unit shut-off due to P.C. BOARD
security (T1 > 15' o T2 > 45')
RED LIGHT Unit shut-off at full storage bin ATTENTION. The check up of the
P.C.BOARD output must be performed in
RED LIGHT Evaporator sensor at -13°C a very short time in order to avoid frequent
(8.5°F) start and stop (every few seconds) of the
electrical components which may damage
RED LIGHT Evaporator sensor at 0°C (32°F) them especially the compressor.
RED LIGHT Compressor under power

TAB. B
LENGTH OF THE DEFROST CYCLE Ts ACCORDING TO THE LENGTH OF T2

T2 Ts

T2 < 5' 210"

5' < T2 < 6' 195"
6' < T2 < 6' 30" 180"
6' 30" < T2 <7' 165"
7' < T2 < 8' 150"
8' < T2 < 9' 135"
9' < T2 < 10' 30" 120"
10' 30" < T2 < 12' 105"
12' < T2 90"
Page 23 Page 23

The setting of the DIP SWITCH keys 3, 4, 5, 6 sump to the spray system and through the spray
and 7 determines the length of the 3rd phase of nozzles sprays it into the inverted cup molds to
freezing cycle (controlled by the electronic timer) be frozen into crystal clear ice cubes.
as detailed in table C. On machines equipped with the water drain
valve, the water pump remains in operation for
15-20 seconds at the beginning of the defrost
The DIP SWITCH keys 8 and 9 setting cycle, in order to pump out to the drain all the
determines the range between cut in and cut out remaining water which is generally rich of minerals
temperature of the ice bin level temperature and sediments deposited into the sump tank
sensor as specified in table D. during the previous freezing cycle.
It is recommended that the pump motor bearings
The 10th DIP SWITCH key is used to change be checked at least every six months.
the setting of the evaporator temperature sensor
from -13°C (8.5°F) - OFF position (ACM 55) to
-16°C (3°F) - ON position on model ACM 45. G. WATER INLET SOLENOID VALVE - 3/4
MALE FITTING

E. WATER SPRAY SYSTEM The water inlet solenoid valve is activated by the
Micro Processor of the P.C. BOARD during the
Through its nozzles, the water pumped, is sprayed first 5 minutes of water filling phase and as well
in each individual cup to be frozen into ice. during the defrost cycle.
It consists of one spray platform which has six When energized it allows a metered amount of
spray nozzles each. incoming water to flow over the evaporator cavity
to assist the hot gas in defrosting the ice cubes.
The water running over the evaporator cavity
F. WATER PUMP drops by gravity, through the dribbler holes of the
platen, into the sump reservoir where it will be
The water pump operates continually throughout sucked by the water pump and primed to the
the freezing cycle priming the water from the spray system.

TAB. C LENGHTS OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO

THE DIP SWITCH SETTING COMBINATIONS

3 4 5 6 7 Ta 3 4 5 6 7 Ta
min. min.

ON ON ON ON ON 0 OFF ON OFF OFF ON 13

OFF ON ON ON ON 1 ON OFF OFF OFF ON 14
ON OFF ON ON ON 2 OFF OFF OFF OFF ON 15
OFF OFF ON ON ON 3 ON ON ON ON OFF 16
ON ON OFF ON ON 4 OFF ON ON ON OFF 17
OFF ON OFF ON ON 5 ON OFF ON ON OFF 18
ON OFF OFF ON ON 6 OFF OFF ON ON OFF 19
OFF OFF OFF ON ON 7 ON ON OFF ON OFF 20
ON ON ON OFF ON 8 OFF ON OFF ON OFF 21
OFF ON ON OFF ON 9 ON OFF OFF ON OFF 22
ON OFF ON OFF ON 10 OFF OFF OFF ON OFF 23
OFF OFF ON OFF ON 11 ON ON ON OFF OFF 24
ON ON OFF OFF ON 12 OFF ON ON OFF OFF 25

TAB. D ICE LEVEL SENSOR CONTROL TEMPERATURE RANGE ACCORDING TO

THE DIP SWITCH SETTING COMBINATIONS

8 9 DELTA T (°C)

ON ON 1
OFF ON 1,5
ON OFF 2
OFF OFF 2,5
Page 24 Page 24

H. WATER INLET SOLENOID VALVE - 3/4 By doing so it allows to the ice maker to make
MALE FITTING (Water cooled version) every new freezing cycle with new fresh water,
avoiding thereby the accumulation of sediments
A second water inlet solenoid valve, operating and scales, which soon or later will cause the
trough an automatic hi pressure control, is used partial or total clogging of the water system of the
on water cooled versions to supply water to the unit.
condenser.
When activated it supplies a metered amount of
water to the condenser in order to limit its tempe- K. FAN MOTOR (Air cooled version)
rature and the refrigerant operating high pressure.
The fan motor, connected in parallel with the
water pump, operates only during the freezing
cycle to draw cooling air through the condenser
I. HOT GAS SOLENOID VALVE fins keeping the the condensing temperature
and the condensing pressure between the
The hot gas solenoid valve consists basically of operating values according to the ambient tem-
two parts: the valve body and the valve coil.
Located on the hot gas line, this valve is energized perature.
through the Micro Processor of P.C. BOARD
during the defrost cycle and during the water
filling phase. L. COMPRESSOR
During the defrost cycle the hot gas valve coil is
activated so to attract the hot gas valve stem in The hermetic compressor is the heart of the
order to give way to the hot gas discharged from refrigerant system and it is used to circulate and
the compressor to flow directly into the evaporator retrieve the refrigerant throughout the entire
serpentine to defrost the formed ice cubes. system. It compresses the low pressure
refrigerant vapor causing its temperature to rise
and become high pressure hot vapor which is
then released through the discharge valve.
J. WATER DRAIN SOLENOID VALVE

The water drain solenoid valve, electrically M. HI PRESSURE CONTROL (Water cooled
connected in parallel to the water inlet and to the version)
hot gas solenoid valves, is energized for all the
length of the defrost cycle. Used only on the water cooled versions it operates
By means of the water pump, that remains to keep between 8.5 and 10 bars (120 ÷ 140 psig)
energized for 15-20 seconds at the beginning of the hi-side or discharge pressure of the refrigerant
the defrost cycle, it allows the drain out of all system by energizing the coil of the water inlet
remaining water (rich of minerals deposited during solenoid valve that control the cooling water flow
the previous freezing cycle) from the sump tank. to the condenser.
Page 25 Page 25

ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES

A. ADJUSTMENT OF THE CUBE SIZE

CAUTION. Before performing actual

adjustment of the cube size, check other
possible causes for cube size problems,
refer to the Service Diagnosis Section for
problem review and analysis.
Do not perform any adjustment till the
icemaking system has progressed
through several complete freezing and
harvest cycle, to observe size and quality SMALL
IDENTATION
of ice cubes and whether or not the cube
size problem exists.

I. If the cubes are shallow size (Indentation is

too deep) probably the length of the third phase
of the freezing cycle is too short so, to extend NORMAL SIZE-AHAPE
such length you have to:

1. Locate the DIP SWITCH on the front of the

P.C.Board.

2. Take note of the combination of the DIP

SWITCH KEYS 3, 4, 5, 6 and 7 and check the
corrisponding length of freezing cycle 3rd phase
as shown on Table C.

3. Change the same DIP SWITCH KEYS

setting so that it will correspond to the combination LITTLE OR NO
on table C coming next to the one remarked at ICE IN CENTER
OF CUBE
step 2.
This will allow an extension of the freezing cycle
of one more minute.
SHALLOW SIZE
4. Observe the ice cubes in the next two
harvests and eventually repeat steps 2 and 3
above until proper ice cubes size is achieved.
See figure.

II. If the cubes are oversize size (Indentation

is too full) probably the length of the second
phase of the freezing cycle is too long.
To shorten such length you have to:

1. Locate the DIP SWITCH on the front of the THICK BULGE

P.C.Board. SOLID ICE

2. Take note of the combination of the DIP

SWITCH KEYS 3, 4, 5, 6 and 7 and check the
corrisponding length of freezing cycle 3rd phase
as shown on Table C. OVER SIZE

3. Change the same DIP SWITCH KEYS

setting so that it will correspond to the combination
on table C pre-ceding the one remarked at 4. Observe the ice cubes in the next two
step 2. harvests and repeat eventually steps 2 and 3
This will reduce an the freezing cycle length of above until proper ice cubes size is achieved.
one minute. See figure.
Page 26 Page 26

B. REPLACEMENT OF EVAPORATOR 3. Unloose the screws securing the pump

TEMPERATURE SENSOR bracket to the unit frame.
1. Remove front and top panel. 4. Locate the plastic hose on the pump
discharge port of the pump and disconnect it.
2. Remove the evaporator cover and snap off
the two metal clip securing the sensor probe to 5. Unloose the nut and the jellow/green ground
the serpentine. wire. Cut the pump electrical wires.
3. Trace the evaporator sensor terminal plug 6. Unloose screw, washer and lockwasher
on the rear side of the control box and remove it and take the water pump off the bracket.
from its socket by carefully pulling out the terminal
plug securing clip. 7. To install the replacement pump follow
previous steps in reverse.
4. To install the replacement evaporator sensor
follow the above steps in reverse.

F. REPLACEMENT OF THE WATER INLET

SOLENOID VALVE
C. REPLACEMENT OF ICE LEVEL
CONTROL SENSOR 1. Remove the rear panel.
1. Remove rear and front panel. 2. Close the hand shut-off valve on the water
supply line and disconnect it from the water inlet
2. Remove the sensor probe of the ice level
control from its holder located on the left side wall fitting at the rear of the cuber.
of storage bin.
3. Disconnect the electrical leads from the
3. Trace the ice level control terminal plug on solenoid valve.
the rear side of control box and remove it from its
socket by carefully pulling out the terminal plug 4. Unscrew the two screws securing the inlet
securing clip. solenoid valve to the cabinet.

4. Withtraw the ice level sensor probe through 5. Remove the corbin clamps and water hose;
the hole located on the rear side of storage bin. the valve is now free.

5. To install the replacement ice level control 6. To install the replacement water inlet
follow the above steps in reverse. solenoid valve follow the above steps in reverse.

D. REPLACEMENT OF P.C. BOARD G. REPLACEMENT OF THE WATER DRAIN

SOLENOID VALVE
1. Remove front and top panel.
1. Remove the rear panel.
2. Trace the evaporator and the ice level sensor
terminal plugs on the rear side of the control box 2. Unloose the two screws securing the water
and remove them from their sockets by carefully drain solenoid valve and its metal bracket to the
pulling out the terminal plug securing clips. unit frame.

3. Disconnect the terminal board connection 3. Trace and disconnect the electrical leads
plug from the rear side of P.C. BOARD then from the water drain solenoid valve coil.
unloose the four screws holding the same to the
plastic control box and remove it. 4. Remove the corbin clamps and the plastic
hoses from the valve.
4. To install the replacement P.C. BOARD
follow the above steps on reverse. 5. Unloose the screws securing the valve to its
metal bracket.

6. To install the replacement water drain

E. REPLACEMENT OF THE WATER PUMP solenoid valve follow the above steps in reverse.

1. Remove top panel.

2. Open the sliding bin door. Water pump is NOTE. When installing the new valve pay
located in small compartment at the right side of attention to the water flow direction.
curtained ice discharge opening.
Page 27 Page 27

H. REPLACEMENT OF THE CONDENSER K. REPLACEMENT OF PLASTIC CURTAIN

WATER INLET SOLENOID VALVE
(Water cooled models) 1. Open the storage bin door to gain access to
the curtain.
1. Remove the rear panel.
2. Remove the plastic curtain from the clips
2. Close the shut-off valve on the water supply holding it, and take out.
line and disconnect it from the water inlet fitting at
the rear of the cuber. 3. To install the replacement plastic curtain
follow the above steps in reverse.
3. Disconnect the electrical leads from the
solenoid valve.

4. Unscrew the two screws securing the inlet

solenoid valve to the cabinet.
L. REPLACEMENT OF SPRAY PLATFORM
5. Remove the corbin clamps and water hose; AND CHUTE
the valve is now free. 1. Follow the steps in procedure L to remove
the plastic curtain.
6. To install the replacement water inlet
solenoid valve follow the above steps in reverse. 2. Lift the plastic spray system from the
evaporator housing and remove the corbin clamp
fastening the plastic hose to the port at the
NOTE. Pay attention of the two different bottom of the spray platform.
typesd of flow controls (located into the outlet
ports of the valve) so to connect each one to 3. Disconnect the plastic hose from the spray
the correct use (production or condenser). platform inlet port and remove it.

4. To install the replacement spray platform

follow above steps in reverse.

I. REPLACEMENT OF HOT GAS VALVE

COIL

1. Remove rear panel. M. REPLACEMENT OF DRIER

2. Remove the hardware securing the hot gas 1. Remove front and back panels .
valve coil to its body.
2. Recover the refrigerant from the system
3. Trace the electric wires belonging to the hot and transfer it in a container so to reclaim or
gas valve coil and disconnect them; then lift the recycle it.
valve coil from the valve body.
3. Unsolder the refrigerant line and the capillary
4. To install the replacement hot gas valve coil tube from the two sides of the drier.
follow previous steps in reverse.
4. To install the replacement drier remove
factory seals and solder the refrigerant line and
the capillary tube taking precautions to NOT
J. REPLACEMENT OF FAN MOTOR OVERHEAT the drier body.

1. Remove back panel. 5. Thoroughly evacuate the system to remove

moisture and non condensable after drier
2. Remove screws and yellow green ground replacement.
wire. Trace the electrical leads of fan motor and
disconnect them. 6. Charge the system with refrigerant 22 by
weight (see data plate of machine) and check for
3. Remove the bolts securing the fan motor leaks.
bracket to the cabinet base and then remove the
assembly. 7. Replace panels previously removed.
4. To install the replacement fan motor follow
the above steps in reverse.

N. REPLACEMENT OF HOT GAS VALVE

NOTE. When installing a new fan motor BODY
check that the fan blades do not touch any
surfaces and move freely. 1. Follow the steps in procedures J to remove
the hot gas valve coil.
Page 28 Page 28

2. Recover the refrigerant from the system P. REPLACEMENT OF AIR COOLED

and transfer it in a container so to reclaim or CONDENSER
recycle it.
1. Remove front and rear panels.
3. Unsolder the refrigerant lines from the hot
gas valve body and remove it from the unit. 2. Remove the two bolts attaching the
condenser to the base.

NOTE. Always install a replacement drier 3. Recover the refrigerant from the system
whenever the sealed refrigeration system is and transfer it in a container so to reclaim or
open. recycle it.
Do not replace the drier until all other repairs
or replacements have been completed. 4. Unsolder the refrigerant lines from the
condenser and remove it from the unit.

4. To install the replacement hot gas valve NOTE. Always install a replacement drier
body follow the above steps in reverse. whenever the sealed refrigeration system is
open.
Do not replace the drier until all other repairs
NOTE. Thoroughly evacuate the system to or replacements have been completed.
remove moisture and non condensables after
hot gas valve replacement.
5. To install the replacement condenser follow
the above steps in reverse.
O. REPLACEMENT OF EVAPORATOR
PLATEN NOTE. Thoroughly evacuate the system to
remove moisture and non condensables after
1. Remove front top and rear panels. condenser replacement.

2. Remove the plastic cover from the upper

part of the evaporator platen.

3. Remove the evaporator sensor probe taking

off the two metal clips securing it to the evaporator Q. REPLACEMENT OF HI PRESSURE
serpentine. CONTROL (Water cooled models)

4. Recover the refrigerant from the system 1. Remove front and rear panels.
and transfer it in a container so to reclaim or
recycle it. 2. Remove screws which secure the hi
pressure control to the unit frame.
5. Remove the water inlet copper tube from
the evaporator chamber after unloosing the 3. Disconnect the terminal wires from the hi
appropriate screws. pressure control.

6. Unsolder and disconnect the capillary tube 4. Recover the refrigerant from the system
and hot gas line from one serpentine of evaporator and transfer it in a container so to reclaim or
and the suction discharge line from the other recycle it.
serpentine.
5. Trace the hi pressure control capillary tube
7. Lift the evaporator platen assembly out of and unsolder and disconnect it from the refrigerant
its seat. system.

NOTE. Always install a replacement drier

NOTE. Always install a replacement drier whenever the sealed refrigeration system is
whenever the sealed refrigeration system is open.
open. Do not replace the drier until all other repairs
Do not replace the drier until all other repairs or replacements have been completed.
or replacements have been completed.

6. To install the replacement hi pressure control

8. To install the replacement evaporator follow follow the above steps in reverse.
the above steps in reverse.

NOTE. Thoroughly evacuate the system to NOTE. Thoroughly evacuate the system to
remove moisture and non condensables after remove moisture and non condensables after
evaporator replacement. hi pressure control replacement.
Page 29 Page 29

R. REPLACEMENT OF WATER COOLED S. REPLACEMENT OF COMPRESSOR

CONDENSER
1. Remove front and rear panels.
1. Remove front and rear panels.
2. Remove the cover and disconnect the
2. Remove bolts which secure the condenser electrical leads from the compressor junction
to the unit base. box.
3. Remove the corbin clamps and disconnect 3. Recover the refrigerant from the system
the plastic hoses from the water cooled and transfer it in a container so to reclaim or
condenser. recycle it.
4. Recover the refrigerant from the system 4. Unsolder and disconnect both the suction
and transfer it in a container so to reclaim or line and the discharge line from the compressor.
recycle it.
5. Remove the four compressor mounting bolts
5. Unsolder the refrigerant lines from the and the compressor from the unit base.
condenser and remove it from the unit.

NOTE. Always install a replacement drier NOTE. Always install a replacement drier
whenever the sealed refrigeration system is whenever the sealed refrigeration system is
open. open.
Do not replace the drier until all other repairs Do not replace the drier until all other repairs
or replacements have been completed. or replacements have been completed.

6. To install the replacement condenser follow 6. To install the replacement compressor follow
the above steps in reverse. the above steps in reverse.

NOTE. Thoroughly evacuate the system to NOTE. Thoroughly evacuate the system to
remove moisture and non condensables after remove moisture and non condensables after
condenser replacement. compressor replacement.
Page 30 Page 30

WIRING DIAGRAM
ACM 45-55 -AIR AND WATER COOLED - 220-240/50/1
The unit is shown on freezing cycle
B - WHITE
G - GREY
N - BLACK
A - BLUE
M - BROWN
GV - YELLOW GREEN
Page 31 Page 31

SERVICE DIAGNOSIS

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

Unit will not run Blown fuse in P.C.Board Replace fuse & check for cause of
(No warning LEDS glows) blown fuse

Main switch in OFF position Turn switch to ON position

Burn-out transformer Replace P.C. Board

Inoperative P.C.Board Replace P.C.Board

Loose electrical connections Check wiring

(Green LED-Power ON glows) P.C.Board selector in STAND BY Move to OPERATING position

Blow 16 A fuse in P.C. Board Replace fuse

(Bin full LED glows) Inoperative ice level control Replace ice level control

(Red-alarm LED glows) Evaporator sensor unplugged Check for properly plug

Evaporator sensor out of order Check with an ohmmeter for

electrical conductivity. If zero or
infinitive replace it

Evaporator sensor probe loose Replace it

on its cable

Compressor doesn't run Check for power on compressor

PC Board outlet. If so replace
compressor.
If not replace PC Board.
Fan motor doesn't run during freezing Replace fan motor
Hot gas valve open during freezing Replace hot gas valve
Water inlet valve open during freezing Replace water inlet valve

No water to the water cooled Check for correct operation of

condenser water solenoid valve
Check for cleannes of water inlet
valve strainer
Check for cleannes of water inlet
valve flow control
Check for shortage of water
Check for correct operation of
pressure control
(Cut in at 10 bar - 140 psi)

Compressor cycles intermittently Low voltage Check circuit for overloading

Check voltage at the supply to the
building. If low, contact the power
company

Non-condensable gas in system Purge the system

Compressor starting device with Check for loose wires in starting

loose wires device

Cubes too small Freezing cycle too short Review setting of DIP SWITCH keys

Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with
vacuum pump

Moisture in the system Same as above

Shortage of water See remedies for shortage of water

Shortage of refrigerant Check for leaks & recharge

Inoperative evaporator sensor Replace sensor

Page 32 Page 32

SERVICE DIAGNOSIS

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

Cloudy cubes Shortage of water See remedies for shortage of water
Dirty water supply Use water softner or water filter
Accumulated impurities Use SCOTSMAN Ice Machine cleaner

Shortage of water Water spilling out through curtain Check or replace curtain
Water solenoid valve not opening Replace valve
Water leak in sump area Locate and repair
Water flow control plugged Remove and clean

Irregular cubes size & some cloudy Some jets plugged Remove jet cover and clean
Shortage of water See shortage of water
Unit not levelled Level as required

Cubes too large Freezing cycle too long Review setting of DIP SWITCH keys
Inoperative evaporator sensor Replace sensor

Decreased ice capacity Inefficient compressor Replace

Leaky water valve Repair or replace
Non-condensable gas in system Purge the system
Poor air circulation or excessive Relocate the unit or provide for
hot location (Red-alarm LED glows) more ventilation

Overcharge of refrigerant Correct the charge. Purge off slowly

Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with
vacuum pump

Undercharge of refrigerant Charge to data plate indication

Discharge head pressure too high See incorrect discharge pressure

Poor harvest Restriction in incoming water line Check water valve strainer and flow
control. If necessary enlarge the
flow control orifice

Water inlet valve not opening Valve coil with open winding
Replace valve

Hot gas valve orifice restricted Replace hot gas valve assy

Air vented holes in mold cups plugged Clean out holes

Discharge head pressure too low See incorrect discharge pressure

Unit won’t harvest Inoperative P.C.Board Replace P.C.Board

Hot gas valve not opening Valve coil with open winding
Replace valve
Water solenoid valve not opening Valve coil with open winding
Replace valve
Incorrect discharge pressure Inoperative fan motor (Air cooled) Replace
Inoperative hi press control (Water cooled) Replace

Water inlet valve to condenser Clean or replace

clogged or inoperative

Excessive water in unit base Water tubing leaking Check. Tighten or replace
Page 33 Page 33

MAINTENANCE AND CLEANING INSTRUCTIONS

A. GENERAL 4. With the ice machine and fan motor OFF on

air cooled models, clean condenser using vacuum
The periods and the procedures for maintenance cleaner, whisk broom or non metallic brush.
and cleaning are given as guides and are not to
be construed as absolute or invariable. 5. Check for water leaks and tighten drain line
Cleaning, especially, will vary depending upon connections. Pour water down bin drain line to be
local water and ambient conditions and the ice sure that drain line is open and clear.
volume produced; and, each icemaker must be
maintened individually, in accordance with its 6. Check size, condition and texture of ice
particular location requirements. cubes. Perform adjustment of DIP SWITCH keys
as required.

B. ICEMAKER 7. Check the ice level control sensor to test

shut-off.
The following maintenance should be scheduled Put a showelfull of ice cubes in contact with the
at least two times per year on these icemakers. control sensor for at least one minute.
This should cause the ice maker to shut off and
1. Check and clean the water line strainer. the light up of the 3rd RED LED.

2. Check that the icemaker is levelled in side

to side and in front to rear directions.
IMPORTANT. Perform the above check
3. Clean the water system, the evaporator, the only at the end of harvest cycle or at the
bin and spray platen using a solution of beginning of freezing cycle in order to do
SCOTSMAN Ice Machine Cleaner. not cause to the unit to make a double
Refer to procedure C cleaning instructions and freezing cycle.
after cleaning will indicate frequency and proce-
dure to be followed in local areas.
Within few seconds after the removal of the
showelfull of ice from the sensing probe, the
icemaker restarts in freezing cycle.

NOTE. The RANGE OF THE ICE LEVEL

CONTROL SENSOR can be adjusted as
shown on table D of PRINCIPLE OF
OPERATION; its cut out setting remains
however at +2°C (35°F).

8. Check for refrigerant leaks.

C. CLEANING INSTRUCTIONS OF WATER

SYSTEM

1. Remove the front and top panels to gain

access either to the control box and to the
evaporator.

NOTE. Cleaning requirements vary according 2. Wait till the end of defrost cycle then, with
to the local water conditions and individual the help of a normal screwdriver, turn the program
user operation. Continuous check of the clarity selector head on STAND BY position to temporaly
of ice cubes and visual inspection of the stop the operation (Fig.8).
water spraying parts before and after cleaning
will indicate frequency and procedure to be 3. Prepare the cleaning solution by diluting in
followed in local areas. a plastic container one or two liters of warm water
(45°-50°C) with a 0,1-0,2 liters of SCOTSMAN
Ice Machine Cleaner.
Page 34 Page 34

7. Let the unit to remain in the CLEANING/

WARNING. The SCOTSMAN Ice Machine RINSING mode for about 20 minutes then turn
Cleaner contains Phosphoric and the program selector on STAND BY again.
Hydroxyacetic acids.
These compounds are corrosive and may 8. Flush out the cleaning solution from the
cause burns if swallowed, DO NOT indu- sump reservoir then pour onto the evaporator
ce vomiting. Give large amounts of water cavity two or three liters of clean potable water to
or milk. Call Physician immediately. rinse the mold cups and the platen.
In case of external contact flush with If necessary remove the water spray platen to
water. KEEP OUT OF THE REACH OF clean it separately as per step 3 of paragraph B.
CHILDREN
9. Turn again the program selector on
CLEANING/RINSING. The water pump is again
in operation to circulate the water in order to rinse
4. Scoop out all the ice cubes stored into the the entire water system.
bin in order to prevent them from being
contaminated with the cleaning solution then 10. Do it twice so to be sure no more traces of
flush out the water from the sump reservoir by descaling solution remains into the sump.
removing the overflow stand-pipe.
11. Pour on the upper side of the evaporator
5. Remove the evaporator cover then slowly platen fresh water with a capfull of disinfectant
pour onto the evaporator platen the cleaning solution then turn again the machine in cleaning
solution. With the help of a brush dissolve the mode so to sanitize all the water system for
most resistant and remote scale deposits in the approx. 10 minutes.
platen.

6. Set the program selector head on NOTE. Do not mix descaling with sisinfectant
CLEANING/RINSING (Fig. 9). solution to avoid the generation of a very
aggressive acid.
NOTE. With the system in CLEANING/
RINSING mode the water pump is the only
component in operation to circulate the 12. Flush out the disinfectant solution from the
cleaning solution in the entire water system. sump reservoir then turn the program selector

FIG. 8

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
SWITCH WATER
VALVOLA IN VALVE
INGR. ACQUA

EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE RELAY
RELÈ
TIMER
ELECTR.
TIMER
ELETTR. HOT GAS
VALVOLA GASVALVE
CALDO
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

POMPA
WATER PUMP

RELAY
RELÈ
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELAY
RELÈ
COMPRESSORE
COMPRESSOR
FUSIBILE
FUSE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD
Page 35 Page 35

on RESET/HI TEMPERATURE position and of the ice cubes and that, they do not have any
immediately afterward to FREEZING acid taste.
OPERATION.
ATTENTION. In case the ice cubes are
NOTE. By setting the selector on RE-SET cloudy-white and have an acid taste, melt
first and then to FREEZING OPERATION them immediately by pouring on them
the ice maker will perform the 5 minutes some warm water. This to prevent that
WATER FILLING phase i.e. the water inlet somebody could use them.
solenoid valve opens to allow the incoming
water to rinse again the water system and to
properly fill-up the sump reservoir for the 15. Wipe clean and rinse the inner surfaces of
next freezing cycle. the storage bin.

13. Place again the evaporator cover and the REMEMBER. To prevent the accumulation
unit service panels. of undesirable bacteria it is necessary to
sanitize the interior of the storage bin with an
14. At completion of the freezing and harvest anti-algae disinfectant solution every week.
cycle make sure of proper texture and clearness

FIG. 9

WATERSCARICO
VALVOLA DRAIN VALVE
ACQUA

TEMPERATURE
SENSORI
SENSORS DIP
SWITCH WATERINGR.
VALVOLA IN VALVE
ACQUA

EVAPORATOR
EVAPORATORE SELECTOR
SELETTORE RELAY
RELÈ
TIMER
ELECTR.
TIMER
ELETTR. HOT GAS
VALVOLA VALVE
GAS CALDO
3
CONTENITORE
BIN 4
PROCESSOR
PROCESSORE
DATA
MICRO-

WATER PUMP
POMPA

RELÈ
RELAY
FAN MOTOR
VENTILATORE
L 1 FUSE
FUSIBILE 5
TRASFOR-
TRANSF.
N 2 MATORE 6
RELÈ
RELAY
COMPRESSOR
COMPRESSORE
FUSE
FUSIBILE 7
FUSIBILE
FUSE 8
SCHEDA
ELECTRONIC
ELETTRONICA
CARD