Scotsman MC 45 User manual

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SERVICE MANUAL
MC 15
MC 45
R 404 AVERSION
Electronic
modular cubers
MS 1000.10 REV. 06/2003

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TABLE OF
CONTENTS Table of contents
Specifications MC 15
Specifications MC 45
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection - Ice maker
Unpacking and Inspection - Storage bin
Location and levelling
Stacking installation
Stacking installation - Mixed units
Stacking installation - Electronic units
Electrical connections
Water supply and drain connections
Final check list
Installation practice
OPERATING INSTRUCTIONS
Start up
Operatiobnal checks
OPERATING PRINCIPLES (How it works)
Freezing cycle
Harvest cycle
Control sequence
Component description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the cube size
Remplacement of evaporator temperature sensor
Remplacement of condenser temperature sensor
Remplacement of ice level light control
Remplacement of P.C. Board
Remplacement of the water pump
Remplacement of water inlet solenoid valve
Removal of the flow control
Remplacement of hot gas valve coil
Remplacement of water drain solenoid valve (Optional)
Remplacement of fan motor
Remplacement of spray bar
Remplacement of drier
Remplacement of hot gas valve body
Remplacement of evaporator platen
Remplacement of air cooled condenser
Remplacement of water cooled condenser
Replacement of water regulating valve (water cooled models)
Replacement of compressor
Wiring diagram
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Cleaning instructions of water system
2
3
5
18
20
21
22
26
27
27
27
27
27
27
27
27
28
28
28
28
28
29
29
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29
30
31
35
37
37
38
13
14
7
7
7
8
8
8
10
11
11
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12

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SPECIFICATIONS
ELECTRONIC MODULAR CUBER MODEL MC 15
I mportant operating requirements:
MIN.
Air temperature 10°C (50°F)
Water temperature 5°C (40°C)
Water pressure 1 bar (14 psi)
Electr. voltage variations
from voltage rating
specified on nameplate -10%
180
170
160
150
140
130
120
110
100
90
80
Kg.
32 10 °C27 21 15
MODÈLES REFROIDIS PAR AIR
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
32
38
10
21
°C180
170
160
150
140
130
120
110
100
90
80
Kg.
32 10 °C27 21 15
MODÈLES REFROIDIS PAR EAU
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
10
21
32
38
°C
ice making capacity
MAX.
40°C (100°F)
35°C (90°F)
5 bars (70 psi)
+10%
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
Tokeepyour SCOTSMAN MODULARCUBER atpeakperformance levels,periodicmaintenance
checks must be carried out as indicated on page 37 of this manual.
Productionchartsshownareindicatingthe production of MCM and MCL models. For MCS models
ice production is approx. 10% lower.
AIR COOLED MODELS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
AIR COOLED MODELS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
WATER COOLED MODELS

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1.5
MC 15 AS 6B Air Stainless steel
MC 15 WS 6B Water Stainless steel
Model Cond. unit Finish Comp. HP Water req. - lt/24 HR
SPECIFICATIONS
300
1700*
MC 15 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 499 mm.
WIDTH 1073 mm.
DEPTH 534 mm.
WEIGHT 117 Kgs.
ACCESSORIES
KSC 11: Cube stacking kit
220-230/50/1 7 1250 25.7 3 x
Starts Electric power cons.
amps. Kwh x 24 HR
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N5.5 32 3 x 1.5 m/m220
400/50/3N5 x 1.5 m/m210
Cubes per harvest: MCL-15 72 large - MCM-15 102 medium - MCS 15 198 small
* At 15°C (60°F) water temperature

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310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32 10 °C27 21 15
MODÈLES REFROIDIS PAR AIR
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
32
38
10
21
°C
MODÈLES REFROIDIS PAR EAU
310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32 10 °C27 21 15
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
10
21
32
38
°C
ice making capacity
AIR COOLED MODELS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
WATER COOLED MODELS
SPECIFICATIONS
ELECTRONIC CUBER MODEL MC 45
I mportant operating requirements:
MIN.
Air temperature 10°C (50°F)
Water temperature 5°C (40°C)
Water pressure 1 bar (14 psi)
Electr. voltage variations
from voltage rating
specified on nameplate -10%
MAX.
40°C (100°F)
35°C (90°F)
5 bars (70 psi)
+10%
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
Tokeepyour SCOTSMAN MODULAR CUBER atpeakperformancelevels,periodic maintenance
checks must be carried out as indicated on page 37 of this manual.
Production charts shown are indicating the production of MCM and MCL models. For MCS models
ice production is approx. 10% lower.

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MC 45 AS 6B Air Stainless steel
MC 45 WS 6B Water Stainless steel 2.5
Model Cond. unit Finish Comp. HP Water req. - lt/24 HR
SPECIFICATIONS
660
2800*
MC 45 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 860 mm.
WIDTH 1073 mm.
DEPTH 554 mm.
WEIGHT 185 Kgs.
ACCESSORIES
KSC 11: Cube stacking kit
220-230/50/1 7 2400 50 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N10 66 3 x 1.5 m/m220
400/50/3N5.5 14 5 x 1.5 m/m210
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: MCL-45 144 large - MCM-45 204 medium - MCS 45 396 small
* At 15°C (60°F) water temperature

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A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
up and operation, maintenance and cleaning for
the SCOTSMAN MODULAR CUBERS.
The Electronic Modular Cubers are quality
designed, engineered and manufactured.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
These icemakers have been engineered to our
own rigid safety and performence standards.
NOTE.Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
Storage Bin
Since the MC series Modular Cubers do not
have their own attached ice storage bins, it is
necessaryto usean auxiliarybin suchas theBin
B 350 or B 550.
B. UNPACKING AND INSPECTION
Modular Cuber
1. CallyourauthorizedSCOTSMANDistributor
or Dealer for proper installation.
2. Visually inspect the exterior of the packing
and skid. Any severe damage noted should be
reportedtothedeliveringcarrierandaconcealed
damage claim form filled in subjet to inspection
of the contents with the carrier’s representative
present.
3. a)Cutandremovetheplasticstripsecuring
the carton box to the skid.
b) Remove the packing nails securing the
carton box to the skid.
c)Cutopenthetopofthecartonandremove
the polystyre protection sheet.
d) Pull out the polystyre posts from the
corners and then remove the carton.
4. Remove top and sides panels of the unit
and inspect for any concealed damage. Notify
carrier of your claim for the concealed damage
as stated in step 2 above.
GENERAL INFORMATION AND INSTALLATION
5. Loosetwonutsonleftandrightssideofthe
unit base and remove it from the skid. Save the
two bolts and nuts to mount the machine on
storage bin or on top of another Modular Cuber.
6. Remove all internal support packing and
masking tape and the hardware package.
7. Check that refrigerant lines do not rub
againstortouchotherlinesorsurfaces,andthat
the fan blade moveS freely.
8. Checkthatthecompressorfitssnuglyonto
all its mounting pads.
9. See data plate on the rear side of the unit
and check that local main voltage corresponds
with the voltage specified on it.
CAUTION. Incorrect voltage supplied to
the icemaker will void your parts
replacement program.
10. Remove the manufacturer’s registration
card from the inside of the User Manual and fill-
in all parts including: Model and Serial Number
taken from the data plate.
Forward the completed self-addressed
registration card to Frimont/Scotsman Europe
factory.
Storage bin
1. Followthesteps1,2and 3abovetounpack
the storage bin.
2. Unloose the two bolts and remove the
protec tion plate from the drain fitting.
3. Carefully lay it down on its rear side and fit
the four legs into their sockets.
4. Remove all internal support packing and
masking tape as well as the plastic ice cube
deflector.
5. Remove the manufacturer’s registration
card from the inside of the User Manual and fill-
in all parts including: Model and Serial Number
taken from the data plate.
Forward the completed self-addressed
registration card to Frimont/Scotsman Europe
factory.

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C. LOCATION AND LEVELLING
WARNING.ThisIceCuber isdesignedfor
indoorinstallationonly.Extendedperiods
of operation at temperature exceeding
the following limitations will constitute
misuseunderthetermsoftheSCOTSMAN
Manufacturer’sLimitedWarrantyresulting
in LOSS of warranty coverage.
1. Position the Bin in the selected permanent
location.
Criteria for selection of location include:
a)Minimumroomtemperature10°C(50°F)
and maximum room temperature 40°C (100°F).
b) Water inlet temperatures: minimum 5°C
(40°F) and maximum 35°C (90°F).
c) Well ventilated location for air cooled
models.
d)Serviceaccess:adequatespacemustbe
leftforallserviceconnectionsthroughtherearof
the ice maker. A minimum clearance of 15 cm
(6")mustbeleftatthesidesoftheunitforrouting
cooling air drawn into and exhausted out of the
compartment to maintain proper condensing
operation of air cooled models.
2. Level the Storage Bin Assy in both the left
to right and front to rear directions by means of
the adjustable legs.
3. InspecttheStorageBintopmountinggasket
which should be flat with no wrinkles, to provide
a good sealing when the Modular Cuber is
installed on top of it.
4. Place the Modular Cuber on top of Storage
bin using care not to wrinkle or tear the gasket.
5. LiftalittlebittheModularCuberrightsidein
order to be able to mount the ice level control
bracket taking care to align the hole located on
unit base to mate with the one on the top of the
Bin.
6. Remove the PVC plastic plug closing the
round hole located on the right side of the ice
chute opening.
7. Tracetheicelevelcontrolassy,securedfor
the transport on top of the evaporator of the
Modular Cuber, and direct it down through the
round hole into the Storage Bin.
8. Fasten the ice level control assy on its
bracket by means of the two screws found in the
hardware package supplied with the unit.
9. Make a cut (shear) in the PVC plastic plug
that goes from its edge to the center; insert the
ice level control cable in the center of the plastic
plugsotopreventitfromanysortofcontactwith
the unit frame, then place again the PVC plug in
the round hole keeping the cable exceeding
portion inside the unit.
10. Install the plastic ice cube deflector by
hooking it on the flange of the ice chute opening
in unit base (see illustration).
11. SecuretheModularCuberonthetopofthe
StorageBinusingthetwoboltsanddiberwasher
foundinthehardwarepackagesuppliedwiththe
unit.
D. ISTACKING INSTALLATION
A Stacking Kit KSC 11 is available as an
accessory on request to allow the installation of
two Modular Cubers one on top of the other.
The Stacking Kit is consisting of:
a)aplasticreinforcedIceChuteConnection
b) an Interface P.C. Board
c) an Extension Cable
d) an adhesive Rubber Stripe
enabling to cover any stacking installation
combination as:
a) When stacking an Electronic Modular
Cuber on an Electromechanical type (Earlier
series).
b) When stacking two Electronic Modular
Cubers.
Mixed units installation
1. Unloose the four screws and remove the
top panel.
2. Remove the two plastic plugs from the
upperedgesofthetwosideframesofthebottom
unit.
3. Trace and remove from the top of the
evaporatorofElectronicCuberthemetalbracket
used to secure the ice level control assy inside
the storage bin.
4. Lift a little bit the Modular Cuber right side
in order to be able to mount the ice level control
bracket taking care to align the hole located on
unit base to mate with the one on the top of the
Bin.

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thentopassthroughtheroundholeprovidedinto
thebaseoftheElectronicModularCuber(Upper
unit).
10. Connect the electric plug of the ice level
control cable to the Cable Extension, then plug-
in this one into its P.C. BOARD socket.
11. RotatetheTRIMMERsettingscrewlocated
in the front of P.C. BOARD clockwise, to its
maximum power, so to compensate the greater
resistence caused by the addition of the Cable
Extension.
12. Stick,withaccuracy,therubberstripeonto
theupperedgeofthefrontpanelofthelowerunit
in order to fill the air gap between the two
machines.
13. Place again in their position the two ice
chutes and finally re-fit all the service panels
previously removed.
5. Put the Electronic Modular cuber on top of
the Electromechanical unit securing them by
meansoftheboltsandnutsfoundinthehardware
package supplied with the machine.
6. Removetheicechutefromboththeunitand
insert, through the ice discharge opening of the
upper unit, the plastic reinforced Ice Chute
Connection.
7. Disconnect the ice level control terminal
plugfromtheP.C.BOARDofElectronicModular
Cuber.
8. Install and fasten the ice level control assy
on its bracket by means of the two screws found
in the hardware package supplied with the unit.
9. Direct ice level control cable first to pass
through the ice discharge opening of the bottom
machine with the protective sheath correctly
located in correspondance of this opening and

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5. Disconnect the ice level control terminal
plug from the P.C. Board of the upper Electronic
Modular Cuber (now colled secondary).
6. Secure the interface P.C. Board to the
contactor metal bracket of the lower unit (now
calledprimary) bymeansofthesuppliedplastic
clamp.
7. Disconnect the ice level control terminal
plugfrom theP.C. Boardof theprimary unitand
connect it to the INLET socket of the interface
P.C. Board (shorter wire).
8. Connect the primary OUTLET terminal
plugofthe Interface P.C.Board(wire of medium
lenght) to the P.C. Board socket of the primary
unit.
9. Connect the secondary OUTLET plug
(longer wire) of the interface P.C. Board to the
P.C. Board socket of the secondary unit (see
drawing).
10. Turn the TRIMMER setting screw (located
on the front center of P.C. Board) of the ice level
control of the secondary unit clockwise to its
maximum power (Only on Syen type).
Electronic units installation
1. Unloose the four screws and remove the
top panel.
2. Remove the two plastic plugs from the
upperedgesofthetwosideframesofthebottom
unit.
3. Put the second Electronic Modular Cuber
onto the bottom one and after having alignet the
two cabinets secure them by means of the bolts
and nuts founded in the hardware package
supplied with the machine.
4. Remove the ice chute from both the unit
and insert, through the ice discharge opening of
the upper unit, the plastic reinforced Ice Chute
Connection.
ATTENTION. All the two PC Boards
installed on the two machines as well as
the interface PC Board supplied in the
KSC 11 Kit must be of the same supplier
(Syen or Pro.EI.Ind.).
Ifnottheunitwiththedifferentoneremains
OFF at storage bin full.

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Sincewateristhemostimportantsingleingredient
in producting ice you cannot emphasize too
much the three items listed above.
Low water pressure, below 1 bar may cause
malfunction of the ice maker unit.
Water containing excessive minerals will tend to
produce cloudy coloured ice cubes, plus scale
build-up on parts of the water system.
Water supply
Connectthe3/4"GASmale fittingofthesolenoid
water inlet valve, using flexible tubing or a 3/8"
O.D. copper pipe, to the cold water supply line
with regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water supply - Water cooled models
The water cooled versions of SCOTSMAN Ice
Makersrequiretwoseparateinletwatersupplies,
one for the water sprayed for making the ice
cubes and the other for the water cooled
condenser.
Connect the 3/4" GAS male fitting of the water
inlet, using the flexible tubing or a 3/8" O.D.
copper pipe, to the cold water supply line with
regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water drain
The recommended drain tube is a plastic or
flexible tube with 18 mm (3/4") I.D. which runs to
an open trapped and vented drain. When the
drain is a long run, allow 3 cm pitch per meter
(1/4" pitch per foot).
Aventattheunitdrainconnectionisalsorequired
for proper sump drainage;
Water drain - Water cooled models
Connect the 3/4" GAS male fitting of the
condenserwaterdrain,utilizingasecondflexible
tubing or a 3/8" O.D. copper tubing, to the open
trapped and vented drain.
NOTE.Thewatersupplyandthewaterdrain
must be installed to conform with the local
code. In some case a licensed plumber and/
or a plumbing permit is required.
F. FINAL CHECK LIST
1. Is the unit in a room where ambient
temperatures are within a minimum of 10°C
(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearance
around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
11. The interface P.C. Board is now ready to
stop simultaneously the operation of the two
units when the infrared beam of the ice level
control is interrupted by the stored ice cubes.
ATTENTION. After removal of the ice
cubes both units resume their operation
starting from the beginning of freezing
cycle.
During the first freezing cycle it could be
posible that the ice cubes produced by
oneofthetwoicemakersbenotofcorrect
shape (cloudy and shallow) due to an
insufficient water level in its sump tank.
This minor problem will desappear in the
next batch because in the harvest cycle
the sump tank will be properly filled-up.
12. Stick, with accuracy, the rubber stripe onto
theupperedgeofthefrontpanelofthelowerunit
in order to fill the air gap between the two
machines.
13. Place again in their position the two ice
chutes and finally re-fit the service panels
previously removed.
E. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.All SCOTSMANicemakersrequire
a solid earth wire.
All SCOTSMAN ice machines are supplied from
thefactorycompletelypre-wiredandrequireonly
electrical power connections to the wire cord
provided at the rear of the unit.
Make sure that the ice machine is connected to
its own circuit and individually fused (see data
plate for fuse size).
Themaximumallowablevoltagevariationshould
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.
NOTE. All external wiring should conform to
national, state and local standards and
regulations.
Check voltage on the line and the ice maker’s
data plate before connecting the unit.
E. WATER SUPPLY AND DRAIN
CONNECTIONS
General
Whenchoosingthewatersupplyfortheiceflaker
consideration should be given to:
a) Length of run
b) Water clarity and purity
c) Adequate water supply pressure

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4. Have all the electrical and plumbing
connectionsbeenmade, andisthe watersupply
shut-off valve open?
5. Has the voltage been tested and checked
against the data plate rating?
6. Has the water supply pressure been
checked to ensure a water pressure of at least 1
bar (14 psi).
7. Havetheboltsholdingthecompressordown
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
8. Checkallrefrigerantlinesandconduitlines
to guard against vibrations and possible failure.
9. Have the bin liner and cabinet been wiped
clean?
10. Has the owner/user been given the User
Manual and been instructed on the importance
of periodic maintenance checks?
11. Has the Manufacturer’s registration card
been filled in properly? Check for correct model
and serial number against the serial plate and
mail the registration card to the factory.
12. Has the owner been given the name and
thephonenumberoftheauthorizedSCOTSMAN
Service Agency serving him?
G. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" gas male fitting
5. Power line
6. Main switch
7/9. Drain fitting
8/10. Vented drain line
11. Open trapped vented drain
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 35°C
(90°F).

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OPERATING INSTRUCTIONS
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections,performthefollowing“Start-up”pro-
cedure.
A. Give power to the unit to start it up by
switching "ON" the power line main disconnect
switch.
NOTE. Every time the unit returns under
power, after having been switched off, the
water inlet valve, the hot gas valve and the
water drain valve get energized for a period
of 5 minutes, thus to admit new water to the
machine sump reservoir to fill it up and,
eventually,towash-offanydirtthatcanhave
depositedinitduringtheunitoffperiod(Fig.1).
B. During the water filling operation, check to
seethattheincomingwaterdribbles,throughthe
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:
THE WATER INLET SOLENOID VALVE
THE HOT GAS SOLENOID VALVE
THE WATER DRAIN SOLENOID VALVE/S
for the first 15 ÷20 seconds
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.Thewaterpressureofthewatersupplyline
thatmustbeatleast1bar(14psig)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.
C. At completion of the water filling phase(5
minutes) the unit passes automatically into the
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 1

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freezing cycle with the start up of:
COMPRESSOR
WATER PUMP
FANMOTOR/S(inaircooledversion)controlled
by the condensing temperature sensor located
within the condenser fins (Fig.2).
OPERATIONAL CHECKS
D. If necessary install the refrigerant service
gauges on both the high side and low side
Schräder valves to check the compressor head
and suction pressures.
NOTE. On air cooled models the condenser
temperature sensor, which is located within
the condenser fins, keep the head
(condensing) pressure between 16 and 18
bars (225-250 psig).
In the water cooled models the discharge
pressure is kept constant at the value of 17
bars(240psig)bymeansofawaterregulating
valve located on the water supply line to the
condenser.
Incaseofcondensercloggingsuchtoprevent
the proper flow of the cooling air or, in case
the fan motor is out of operation or shortage
of water in the water cooled condenser, the
condenser temperature rises and when it
reaches70 ° C(160 ° F)-foraircooledversion
-or 60 ° C(140 ° F)- for water cooled version -
the condenser temperature sensor shuts-off
theicemakerwiththeconsequentlight-upof
the RED WARNING LED (Fig.3).
Afterhavingdiagnosedthereasonoftherise
of temperature and removed its cause, it is
necessarytounplug (waitfewseconds)and
pluginagaintheunit,thustoputthemachine
in condition to initiate a new freezing cycle.
Themachinerestartswiththeusual5minutes
waterfillingphaseinordertoprovideenough
water into the sump tank.
E. Check to see through the ice discharge
openingthattheselfpropellerspraybariscorrectly
rotating and that the water jets uniformely reach
theinterioroftheinvertedmoldcupsandthereis
not excessive water spilling through it.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 2

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F. Theicemakingprocesstakesplacethereby,
with the water sprayed into the molds that gets
graduallyrefrigeratedbytheheatexchangewith
the refrigerant flowing into the evaporator
serpentine.
Duringthefreezingprocess,whentheevaporator
temperaturefallsbelowanestablishedvalue,to
the evaporator temperature sensor supplies a
lowvoltagepower signal totheelectroniccontrol
device (P.C.BOARD) in order to activate an
electronic timer.
This one takes over the control of the freezing
cycle up to the complete formation of the ice
cubes (Fig.4).
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 4
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 3

Page 16
Page 16
NOTE. Thelengthoftheentirefreezingcycle
is governed by the evaporator temperature
sensorwhich has its brobe placed in contact
with the evaporator serpentine (Non
adjustable)incombinationwiththeelectronic
timer (Adjustable) incorporated in the P.C.
BOARD).
The timer adjustment is factory set in
considerationoftheicemakermodel,cooling
version and ice cube size (Small, Medium,
Large).
It is possible, however, to modify the timed
length of the freezing cycle, by changing the
DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION
areshownthevarioustimeextensionsofthe
freezingcyclesecondphase,inrelation with
the different DIP SWITCH keys settings.
G. After about 17-20 minutes from the
beginning of the freezing cycle, in an hypothetic
ambient temperature of 21°C , the defrost cycle
takes place with the hot gas and the water inlet
valves being simoultaneously activated (Fig.5).
The electrical components in operation are:
COMPRESSOR
WATER PUMP
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/S
for the first 15 ÷20 seconds.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0 ° C (32 ° F) -
small Red LED blinking-to-15 ° C (5 ° F) small
Red LED ON steady.
Itispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 24.
H. Check, during the defrost cycle, that the
incomingwaterflowscorrectlyintosumpreservoir
in order to refill it and that the surplus overflows
through the overflow drain tube.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 5

Page 17
Page 17
I. Checkthetextureoficecubesjustreleased.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
Ifnot,waitforthecompletionofthesecondcycle
before performing any adjustment.
Ifrequired,thelength of the timed freezing cycle
can be modified by changing the DIP SWITCH
keys setting as illustrated in OPERATING
PRINCIPLE.
If the ice cubes are shallow and cloudy, it is
possible that the ice maker runs short of water
during the freezing cycle second phase or, the
quality of the supplied water requires the use of
an appropriate water filter or conditioner.
J. To be sure of the correct operation of ice
level control device, place one hand between its
sensing “eyes” to interrupt the light beam.
The Bin Full YELLOW LED starts to blink, and
after 60 seconds, the unit stops with the
simultaneousglowingof the same LED to moni-
tor the BIN FULL situation (Fig.6).
Take the hand out from the ice level control
sensors to allow the resumption of the light
beam.
After approximately 6 seconds the ice maker
resumeitsoperationwiththeimmediateglowing
of the FIRST YELLOW LED indicating UNIT IN
OPERATION and the extinguishing of the “BIN
FULL” YELLOW LED.
NOTE. The ICE LEVEL CONTROL
(INFRARED SYSTEM) is independent of
thetemperaturehowever, the reliabilityofits
detection can be affected by external light
radiations or by any sort of dirt and scale
sediment which may deposit directly on the
light source and on the receiver.
To prevent any possible ice maker
malfunction, due to negative affection of the
lightdetertor,itisadvisabletolocatetheunit
where it is not reached by any direct light
beamorlightradiation,alsoitisrecommended
tokeep thebindoorconstantlyclosed andto
follow the instructions for the periodical
cleaning of the light sensor elements as
detailed in the MAINTENANCE AND
CLEANING PROCEDURES.
K. Remove, if previously installed, the
refrigerant service gauges and re-fit the unit
service panels previously removed.
L. Instruct the owner/user on the general
operation of the ice machine and about the
cleaning and care it requires.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 6

Page 18
Page 18
When the temperature of the evaporator
serpentinedropstoapre-setvalue,theevaporator
sensor probe changes its electrical resistance
allowingalowvoltagecurrent(8-10volts)toflow
to the P.C. BOARD which in turn activates an
electronic timer.
The timer, which is built-in the P.C. BOARD,
takes over from the evaporator temperature
sensor, the control of the freezing cycle up to its
completion.
NOTE. Thechangeoftheelectricpotentialof
the evaporator sensor with the consequent
activationofthetimer(Timemode)issignalled
by the glowing-up of the RED LED located
besidetheFREEZINGyellowoneinthefront
of the P.C. BOARD.
ATTENTION. In case, after 15 minutes
from the beginning of the freezing cycle,
thetemperature of theevaporator sensor
probe is higher then 0°C (32°F) (shortage
of refrigerant, inoperative hot gas valve,
etc.) the P.C. BOARD switch OFF
immediately the unit with the
simultaneous blinking of the WARNING
RED LED.
The length of this second portion of the freezing
cycle ispre-fixedandrelatedtothesettingofthe
first four DIP SWITCH keys.
The DIP SWITCH keys setting is made in
consideration of the type of condenser used.
InTableBareindicatedthevariouslengthsofthe
second portion of freezing cycle (Time mode) in
relation to the different combinations of the DIP
SWITCH KEYS.
In Table A herebelow are illustrated the DIP
SWITCHkeycombinationsforthethreedifferent
factory.
PRINCIPLE OF OPERATION
How it works
In the SCOTSMAN Modular Cubers the water
used to make the ice is kept constantly in
circulationbyanelectricwaterpumpwhichprimes
it to the self propeller spray bar nozzles from
whereitisdivertedintotheinvertedmoldcupsof
the evaporator (Fig. B).
Asmallquantityofthesprayedwaterfreezesinto
ice; the rest of it cascades by gravity into the
sump assembly below for recirculation.
FREEZING CYCLE (Fig. A)
The hot gas refrigerant discharged out from the
compressorreachesthecondenserwhere,being
cooleddown,condensesintoliquid.Flowinginto
the liquid line it passes through the drier filter,
thenitgoesallthewaythroughthecapillarytube
where, due to the heat exchanging action, it
loosessomeofitsheatcontentsothatitspressure
and temperature are lowered as well.
Next the refrigerant enters into the evaporator
serpentine (which has a larger I.D. then the
capillary) and starts to boil off; this reaction is
emphasized by the heat transferred by the
sprayed water.
The refrigerant then increases in volume and
changes entirely into vapor.
The vapor refrigerant then passes through the
suction accumulator (used to prevent that any
small amount of liquid refrigerant may reach the
compressor)andthroughthesuctionline.Inboth
theaccumulatorandthesuctionlineitexchanges
heatwiththe refrigerantflowinginto thecapillary
tube (warmer), before to be sucked in the
compressor and to be recirculated as hot
compressed refrigerant gas.
Thefreezingcycleiscontrolledbytheevaporator
temperaturesensor(whichhasitsprobeincontact
with the evaporator serpentine) that determines
the length of its first portion of the cycle.
TAB. A
DIP SWITCH FACTORY SETTING COMBINATIONS PER MODEL AND VERSION
DIP SWITCH 1234
MCS 15-45 A
MCS 15-45 W
MCM 15 A
MCM 15 W
MCM 45-1210 A
MCM 45-1210 W
MCL 15-45-1210 A
MCL 15-45-1210 W
MCXL 45 W
5678910
FREEZING CYCLE DEFROST CYCLE DEFR. CYCLE
ADD. TIME 15/30°
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
AIR
WATER
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF

Page 19
Page 19

Page 20
Page 20
The electrical components in operation during
the freezing cycle are:
COMPRESSOR
FAN MOTOR (in air cooled version)
WATER PUMP
CONTACTOR COIL
and during the second phase of freezing cycle
(Time mode) they are joined by the
ELECTRONIC TIMER
The refrigerant head pressure, in the course of
the freezing cycle, ranges between 18 and 16
bars (250-225 psig) being controlled by the tem-
perature sensor probe located within the
condenser fins (air cooled version) or, on the
condenser tube coil (water cooled version).
Ontheair cooled version,thecondensertempe-
rature sensor, when senses a rising of the
condenser temperature beyond the pre-fixed
limit,changesitselectricalresistanceandsenda
lowvoltagepowerflow to the Micro Processorof
P.C. BOARD which in turn energizes, through a
TRIAC, the FAN MOTOR.
When the opposite situation occures, i.e. the
condensertemperaturegetsbelowthe pre-fixed
limit, the temperature sensor changes again its
electricalresistancereducingthereforethecurrent
flow to the P.C. BOARD to cause the fan motor
temporary cut-off.
NOTE.Onthismodelthecondensersensors
areusedjustto switch offtheunitincasethe
condensingtemperatureriseuptomorethen
70 ° C (for air cooled version) or more then
62 ° C(forwatercooledversion)foroneofthe
following abnormal reasons:
CLOGGED CONDENSER (Air cooled
version)
FAN MOTOR OUT OF OPERATION (Air
cooled version)
INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
AMBIENTTEMPERATUREHIGHERTHEN
40 ° C (100 ° F)
itcausesthetotalandimmediateSHUT-OFF
of the machine in order to prevent the unit
from operating in abnormal and dangerous
conditions.
When the ice maker stops on account of this
protective device, there is a simultaneous
glowingoftheRED LED,warningtheuserof
the Hi Temperature situation.
After having efiminated the source of the
condenser hi-temperature, to restart the
machine justswitchingOFFandONthe unit
at main line switch.
Theicemachineresumesitsnormaloperation
by going through the 5 minutes water filling
phase.
At the start of the freezing cycle the refrigerant
suctionorlo-pressurelowersrapidlyto2.5 bars-
35psigthenitdeclinesgradually-inrelationwith
thegrowing ofthe icethickness-to reach,atthe
end of the cycle, approx. 1.6 ÷1.7 bar - 22 ÷24
psigwiththecubesfullyformedinthecupmolds.
Thetotallengthofthefreezingcyclerangesfrom
20 to 25 minutes.
DEFROST OR HARVEST CYCLE (Fig. D)
As the electronic timer has carried the system
throughout the second phase of freezing cycle,
the defrost cycle starts.
ATTENTION. In case the unit be able to
reach0°C(32°F)evaporatingtemperature
within 15 minutes, but after 45 minutes
fromthebeginningofthefreezingcycleit
has not yet reached the evaporator tem-
perature of -15°C (5°F) the machine goes
straight into the defrost cycle omitting
the timed portion of the freezing cycle
relied to the setting of the first four DIP
SWITCHES.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0 ° C (32 ° F) -
small Red LED blinking-to-15 ° C (5 ° F) small
Red LED ON steady.
Itispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 24.
The electrical components in operation during
this phase are:
COMPRESSOR
CONTACTOR COIL
WATER INLET VALVE
HOT GAS VALVE
WATER DRAIN VALVE
and the
WATER PUMP
on the first 30 seconds.
The incoming water, passing through the water
inlet valve and the flow control, runs over the
evaporator platen and then flows by gravity
through the dribbler holes down into the sump/
reservoir (Fig. D).
Thewaterfillingthesump/reservoirforcespartof
the surplus water from the previous freezing
cycletogoouttothewastethroughtheoverflow
pipe. This overflow limits the level of the sump
water which will be used to produce the next
batch of ice cubes.
Meanwhile,therefrigerantashot gas,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 causing
the defrost of the ice cubes. The ice cubes,
released from the cups, drop by gravity onto a
slanted cube chute, then through a curtained
opening they fall into the storage bin.