Scotsman MF 47 User manual

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SCOTSMAN EUROPE - FRIMONT SPA
Via Puccini, 22 - 20010 Pogliano M.se - Milano - Italy
Tel. [phone] (Aut. Sel.)- Telefax [phone]
Direct Line to Service & Parts:
Phone [phone] - Fax [phone]
Website: www.scotsman-ice.com
E-Mail: [email protected]
ISO 9001 - Cert. n. 0080
MF 47
MF 57
R 290 VERSION
NEW PC BOARD
Electronic modular
superflakers
REV. 06/2014
SERVICE MANUAL

LED STATUS REASON WHY – SIGNIFICATION – SIGNIFICATO – Beschreibung
ON STEADY
FIXE
FISSO
Ständig an
UNIT OFF AT BIN FULL
CABINE PLAINE
CONTENITORE PIENO
Maschine AUS, Speicher voll!
BLINKING SLOW
CLIGNOTANT LENT
LAMPEGG. LENTO
Blinkt langsam
I/R BEAM CUTTED
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE INTERROMPU
RAGGIO INFRAROSSO INTERROTTO
Lichtschranke unterbrochen!
BLINKING FAST
CLIGNOTANT RAPIDE
LAMPEGG. VELOCE
Blinkt schnell
I/R ON AFTER TRIP OFF AT BIN FULL
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE ETABLI
RAGGIO INFRAROSSO RIPRISTINATO INTERROTTO
Speicher entleert, Maschine startet gleich!
ON STEADY
FIXE
FISSO
Ständig an
NO WATER
MANQUE D’EAU
MANCANZA ACQUA
Kein Wasser!
ON STEADY
FIXE
FISSO
Ständig an
TOO HI DISCHARGE PRESSURE/TEMPERATURE
COUPURE HP
FERMATA ALTA TEMP. CONDENSAZIONE
Zu hoher Kondensationsdruck
BLINKING
CLIGNOTANT
LAMPEGGIANTE
Blinkt
DELAY AT START UP (3 min. or 60 min. according to the Jumper setting)
TEMPORISATION AU DEMARRAGE (3 min ou 60 min. selon le reglage du chavalier)
RITARDO PARTENZA (3' o 60’ in funzione della regolazione del ponticello)
3 min. oder 60 min. Startverzögerung je nach Jumper Konfig.!
BLINKING 3 TIMES AND REPEAT
CLIGNOTANT 3 FOIS ET NOUVEAU
LAMPEGGIANTE 3 VOLTE
BLINKT 3 MAL und wiederholen
TOO LOW ROOM TEMP (< +3°C)
COUPURE TRES BASSE TEMP. AMBIANTE (< +3°C)
FERMATA TEMP. AMBIENTE BASSA (< +3°C)
Zu hoher Raumtemp. < +3°C!
ON STEADY
FIXE
FISSO
Ständig an
NO, SLOW OR WRONG ROTATION OF DRIVE MOTOR
MOTOREDUCTEUR TOURNE A L'ENVERS, NE TOURNE PAS, OU TROP LENTEMENT
MOTORE RIDUTTORE GIRA AL CONTRARIO, NON GIRA O GIRA LENTAMENTE
Keine, zu langsame oder schwere Getriebrotation!
BLINKING
CLIGNOTANT
LAMPEGGIANTE
Blinkt
TOO HI EVAP. TEMP. (> 0C°) AFTER 10' FROM START UP OR TOO LOW EVAP. TEMP. (< -25°C)
COUPURE TEMP. EVAP. >0°C APRES 10' DE FONCTIONNEMENT OU TEMP. EVAP. <-25°C
TEMP. EVAP >0 °C DOPO 10' DA INIZIO FUNZIONAMENTO O INFERIORE A -25°C
Zu hohe Verd.temp. > 0°C 10 min. nach dem Start oder zu niedrige Verd.temp. < -25°C
ON STEADY
FIXE
FISSO
Ständig an
BLINKING
CLIGNOTANT
LAMPEGGIANTE
Blinkt
CONDENSER SENSOR OUT OF ORDER
SONDE CONDENSEUR HS
SONDA CONDENSATORE MALFUNZIONANTE
Kondensatorfühler defekt!
EVAPORATOR SENSOR OUT OF ORDER
SONDE EVAPORATEUR HS
SONDA EVAPORATORE MALFUNZIONANTE
Verdampferfühler defekt!
BLINKING ALTERNATE
CLIGNOTANT ALTERNE’
LAMPEGGIANTE ALTERNATO
Blinkt im Wechsel!
OPTICAL ICE LEVEL CONTROL OUT OF ORDER
CELLULE INFRAROUGE NIVEAU GLACE HS
SONDA ALL’INFRAROSSO LIVELLO GHIACCIO MALFUNZIONANTE
Lichtschranke defekt!
BLINKING
CLIGNOTANT
LAMPEGGIANTE
Blinkt
6 OR 12 MONTHS WATER SYSTEM CLEANING REMIND (according to the Jumper setting)
RAPPEL NETTOYAGE SYSTÉME HYDAULIQUE APRÉS 6 OU 2 MOIS (selon reglage. chavalier)
RICHIAMO PULIZIA CIRCUITO IDRICO DOPO 6 O 12 MESI (In funzione regolazione ponticello)
6 oder 12 Monate Reinigungshinweis für Wassersystem je nach Jumper Konfig.!
BLINKING IN SEQUENCE
CLIGNOTTANT EN SEQUENCE
LAMPEGGIANTE IN SEQUENZA
Blinken nacheinander!
PURGE CYCLE IN OPERATION (Only on units equipped with purge valve)
CYCLE D’ÉVACUATION EAU EN FONCTION (Seulement dans les machine equipées avec vanne de vidange
eau)
SISTEMA SCARICO ACQUA IN FUNZIONE (Solo negli apparecchi dotati di valvola di scarico)
Spülzyklus läuft, bei Maschinen mit Ablaßventil!
BLINKING
CLIGNOTANT
LAMPEGGIANTE
Blinken
UNIT OFF DUE TO THE JUMPER ON TEST CONTACTS
MACHINE A L’ÂRRET – CONTACTS TEST FERMÉES
MACCHINA FERMA – CONTATTI TEST CHIUSI
Jumper Konfig. Im Testmodus!
PUSH AND HOLD THE RED LIGHTED SWITCH OR THE PC BOARD BUTTON FOR MORE OF 5 SECONDS WITH MACHINE IN OPERATION
TILL THE SWITCHING OFF OF THE TWO YELLOW LEDS TO RESTART THE CLEANING REMIND COUNTDOWN
APPUYER SUR LE BOUTON ROUGE OU SUR LE BOUTON DE LA CARTE POUR 5 SECONDES AVEC LA MACHINE EN FONCTIONNEMENT
JUSQU’A L’ETEINTE DE LES DEUX LEDS JAUNE POUR REINITIALISER L'ALARME JUSQU'AU PROCHAIN DETARTRAGE
PREMERE IL PULSANTE ROSSO O IL PULSANTE DELLA SCHEDA PER PIU' DI 5" CON LA MACCHINA IN FUNZIONE FINO ALLO
SPEGNIMENTO DEI DUE LED GIALLI PER FAR RIPARTIRE IL CONTEGGIO PER LA PROSSIMA DISINCROSTAZIONE
Drücken und halten Sie den roten Schalter oder den push button auf der Elektronik, für mehr als 5 Sekunden wenn die Maschine in Betrieb ist, bis
die 2 gelben LED´s auf der Elektronik nicht mehr leuchten!
Der Erinnerungszyklus für die Reinigung ist somit zurückgesetzt und startet neu!

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TABLE OF
CONTENTS
Table of contents page 2
Warning 3
Specifications MF 47 4
Specifications MF 57 6
GENERAL INFORMATION AND INSTALLATION
Introduction 8
Unpacking and Inspection - Ice maker 8
Unpacking and Inspection - Storage bin 8
Location and levelling 9
Electrical connections 9
Water supply and drain connections 10
Final check list 10
Installation practice 11
OPERATING INSTRUCTIONS
Start up 12
Operational checks 14
PRINCIPLE OF OPERATION (How it works)
Water circuit 17
Refrigerant circuit 17
Mechanical system 19
Operating pressures 20
Components description 21
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the evaporator water level 25
Replacement of the Gear Motor Magnetic Sensor 25
Replacement of the auger, water seal, bearings and coupling 25
Replacement of the gear motor assy 26
Replacement of the freezing cylinder 27
Wiring diagram MF 47 - MF 57 single phase 28
Service diagnosis 29
MAINTENANCE AND CLEANING INSTRUCTIONS
General 31
Icemaker 31
Cleaning instructions of water system 31

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SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR SUPERFLAKER
MODEL MF 47
Important operating requirements:
MIN MAX
• Air temperature 10°C (50°F) 40°C (100°F)
• Water temperature 5°C (40°F) 35°C (90°F)
• Water pressure 1 bar (14 psi) 5 bars (70 psi)
• Electr. voltage
• variations from voltage
• rating specified
• on nameplate -10% +10%
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
To keep your SCOTSMAN FLAKER at peak performance levels, periodic maintenance checks
must be carried out as indicated on maintenance section of this manual.
300
290
280
270
260
250
240
230
220
210
200
190
180
170
160
150
Kg. °C
10
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
38
32 27 21 15 10 °C
21

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SPECIFICATIONS
Start Electric power cons.
Amps Kwh per 24 HR
Water req.
lt/24 HR
MF 47 - MACHINE SPECIFICATIONS
Dimensions:
HEIGHT (less legs) 645 mm.
HEIGHT (with legs) 650 mm.
WIDTH 535 mm.
DEPTH 660 mm.
WEIGHT 77 Kg.
Model Finish
Cond. unit Comp. HP
MF 47 AS Air 300
S. Steel 1
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 2.9 1000 22.7 3 x 1.5 mm 16
2
* A 21°C water temperature

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SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR SUPERFLAKER
MODEL MF 57
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
To keep your SCOTSMAN FLAKER at peak performance levels, periodic maintenance checks
must be carried out as indicated on maintenance section of this manual.
Important operating requirements:
MIN MAX
• Air temperature 10°C (50°F) 40°C (100°F)
• Water temperature 5°C (40°F) 35°C (90°F)
• Water pressure 1 bar (14 psi) 5 bars (70 psi)
• Electr. voltage
• variations from voltage
• rating specified
• on nameplate -10% +10%

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Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1
400/50/3+N
SPECIFICATIONS
Start Electric power cons.
Amps Kwh per 24 HR
Water req.
lt/24 HR
MF 57 - MACHINE SPECIFICATIONS
Dimensions:
HEIGHT (less legs) 785 mm.
HEIGHT (with legs) 790 mm.
WIDTH 535 mm.
DEPTH 660 mm.
WEIGHT 93 Kg.
Model Finish
Cond. unit Comp. HP
* A 15°C water temperature
MF 57 AS

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GENERAL INFORMATION AND INSTALLATION
A. INTRODUCTION
This manual provides the specifications and the
step-by-step procedures for the installation,
start-upandoperation,maintenanceandcleaning
for the SCOTSMAN MF 47, MF 57 Modular
Icemakers.
TheElectronic Superflakersarequalitydesigned,
engineered and manufactured.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
4. Remove the top and front panel 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.
5. Remove all internal support packing and
masking tape.
6. Check that refrigerant lines do not rub
againstortouchother linesorsurfaces,andthat
the fan blades move freely.
7. Checkthat thecompressor fitssnuglyonto
all its mounting pads.
8. 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.
9. 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.
Forwardthe completedself-addressed registra-
tion card to SCOTSMAN EUROPE/Frimont
factory.
Storage bin (SB Series)
1. Follow the steps 1, 2 and 3 above to
unpack the storage bin.
2. Unloose the two bolts and remove the
protec tion plate from the drain fitting on model
SB 530 S.
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
deflectorwhichisnotusedwiththeSCOTSMAN
Modular Flakers.
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.
Forwardthe completedself-addressed registra-
tion card to SCOTSMAN EUROPE/Frimont
factory.
Storage bin (UBH Series)
1. Follow the steps 1, 2 and 3 above to
unpack the storage bin.
NOTE.Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
Storage Bin
SincetheMFseriesModularFlakersdonothave
theirownattachedicestoragebins,itisnecessary
to use an auxiliary bin as detailed here below:
SB 393 S or SB 530 S with its companion
CBT 30 EFSD Top Cover in combination with
MF 47 and MF 57
SB550SwithitscompanionCBT42EFSD
TopCoverincombinationwithMF47andMF57
SB948SwithitscompanionCBT48FMCD
TopCoverincombinationwithMF47andMF57
SB1025SwithitscompanionCBT52FMCD
in combination with MF 47 and MF 57
UBH 1100 or UBH 1600 in combination
with MF 47, MF 57.
B. UNPACKING AND INSPECTION
Icemaker
1. CallyourauthorizedSCOTSMANDistributor
or Dealer for proper installation.
2. Visually inspect the exterior of the packing
and skid. Any severe damage noted should be
reportedtothedeliveringcarrierandaconcealed
damageclaimformfilledinsubjettoinspectionof
the contents with the carrier’s representative
present.
3. a)Cutandremovetheplasticstripsecuring
the carton box to the skid.
b)Cut openthetop of thecarton and removethe
polystyre protection sheet.
c) Pull out the polystyre posts from the corners
and then remove the carton.

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3. On SB Series Storage Bin inspect its top
mounting gasket which should be flat with no
wrinkles, to provide a good sealing when the
CBT Top Cover is installed on top of it.
4. PlacetheCBTTopCoverontopofStorage
bin using care not to wrinkle or tear the gasket.
5. On the UBH Series Storage Bin unloose
the screws securing the S.S. Top Cover to the
storage bin and remove it.
6. Lay out on the bin top the plan of the ice
machineasitwillbelocatedonthebinandcutan
openinginthebintopfortheicedroparea;cover
the edges of the opening with vinyl tape.
7. Install the gasket-on the bin top-around ice
drop opening of the bin top; apply sealant along
the inside of the gasket.
8. Positionandinstallthefouraluminiumfront
to rear stiffeners (U shaped) paying attention to
the guideline shown on the drawing.
NOTE. Bin wall gasket must be cut to clear
the stiffener ends as shown on drawing.
Do not put any stiffeners crossing the ice
drop opening.
9. Install the bin top in its position onto the bin
top by:
-placetherearsideoftopagainstrearedge
of the bin
-lowerthefrontofthetopontothestiffeners
- re-fit the screws previously removed as
per step 5
10. Install the Modular Flaker or Superflaker
onto the Top Cover of storage bin pay attention
to match the ice chute with the Bin Top opening.
D. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.AllSCOTSMAN icemakersrequire
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.
2. Lay carefully down the bin on its back to
protect the finish and remove the bolts holding
the shipping skid to the bin.
3. Screw-in the legs into the corresponding
tappedholesinthebinbottomandtightentoseat
the legs well against the bin bottom.
4. Connect the water drain line to the male
drain fitting located in the bottom of the bin.
CAUTIONS. Avoid excessive tightening
force when connecting to this fitting.
Do not apply excessive heat if any
sweatingofthefittingsisnecessary.Heat
conduction through the metal may melt
the threads in the plastic drain.
5. Insert the longer side of each plastic
inspection window in the upper track of the
corresponding opening and push it to force the
window to enter into its seat.
CBT Top Covers
1. Follow the steps 1 and 2 above to unpack
the top cover.
2. Cut open the carton box and pull out the
CBT Top Cover.
3. On CBT 48/52 FMCD Top Covers, the ice
drop area must be cutted on the plastic cover in
the same position of the ice machine ice chute
opening.
C. LOCATION AND LEVELLING
WARNING. This Modular Flaker and
Superflaker is designed for indoor
installation only. Extended periods of
operation at temperature exceeding the
following limitations will constitute
misuseunderthetermsoftheSCOTSMAN
Manufacturer’sLimitedWarrantyresulting
in LOSS of warranty coverage.
1. Position the storage 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 (clean the air cooled condenser at
frequent intervals).
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.
STIFFENER
CUT GASKET HERE
BIN WALL GAKET
TOP SHELL

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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
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
producescalebuild-upontheinteriorpartsofthe
water system while too soft water (with too lo
contents of mineral salts), will produce a very
hard flaker ice.
WATER SUPPLY
Connect the 3/4" GAS male of the water inlet
fitting,usingthefoodgradeflexiblehosesupplied
tothecoldwatersupplylinewithregularplumbing
fitting and a shut-off valve installed in an
accessible position between the water supply
line and the unit.
If water contains a high level of impurities, it is
advisable to consider the installation of an
appropriate water filter or conditioner.
WATER DRAIN
The recommended drain tube is a plastic or
flexiblehosewith18mm (3/4")I.D.whichrunsto
an open trapped and vented drain. When the
drain is a long run, allow 3 cm pitch per meter
(1/4" pitch per foot).
Installaverticalopenventondrainlinehighpoint
at the unit drain connection to ensure good
draining.
The ideal drain receptacle is a trapped and
vented floor 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)
4. Have all the electrical and plumbing
connectionsbeen made,and isthe 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. Checkallrefrigerantlinesand conduitlines
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
Manualandbeeninstructedontheimportanceof
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?

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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. Drain fitting
8. Vented drain
9. Vented drain
10. 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).

Page 12
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OPERATING INSTRUCTIONS
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections, perform the following “Start-up”
procedure.
A. Open the water supply line shutoff valve
andputtheunitunderelectricalpowerbymoving
themain switch, on the power supply line, to the
ON position.
The first LED - GREEN - will glow to signal that
unit is under power.
NOTE. Every time the unit is put under
power,afterbeingkeptforsometimeinshut-
offconditions(electrically disconnected)the
RED LED willblinkfor 3 minutes after which
the unit will start up with the immediate
operation of the gear motor assembly and,
after few seconds, of the compressor
(Fig.1).
B. Elapsed the stand by period the unit starts
operating with the activation in sequence of the
following assemblies:
GEAR MOTOR/S
COMPRESSOR
FAN MOTOR
kept under control by the condenser temperatu-
resensorwhichhasitsprobewithinthecondenser
fins (Fig.2).
C. After 2 or 3 minutes from the compressor
start up, observe that flaker ice begins dropping
off the ice spout to fall through the ice chute into
the storage bin.
NOTE.The first ice bits that dropintotheice
storagebinarenotsohardastheevaporating
temperaturehas not yet reached the correct
operating value. It is necessary to allow the
ice - just made - to cure itself and wait for
about ten minutes for the evaporating tem-
perature to reach the correct value so to
make more hard bits of ice.
FIG. 1
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
DATA PROCESSOR
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
T>1°C
11
10
9
1
2
L
N
8
7
6
5
4
3
13
12

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FIG. 3
FIG. 2
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
T 40÷50°C
DATA PROCESSOR
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
DATA PROCESSOR
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
T>-1°C
11
10
9
1
2
L
N
8
7
6
5
4
3
10
9
1
2
L
N
8
7
6
5
4
3
12
11
13
13
12

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NOTE. If, after ten minutes from the
compressor start-up, the evaporating tem-
perature has not dropped down to a value
lower than -1 ° C (30 ° F) theevaporatingtem-
perature sensor detects such an abnormal
situation and stops consequently the unit
operation (first the compressor and 3' later
the gear reducer).
Inthiscircustance,the5thwarningYELLOW
LED will blink.
The machine will remain in OFF mode for
one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3timesin3hours,themachineSHUTSOFF
DEFINITIVELY.
After having diagnosed and eliminated the
cause of the too hi evaporating temperature
(insufficient refrigerant in the system or
compressor not running) it is necessary to
unplug and plug in again to restart the
machine. The unit, before resuming the
normal operation, will go through the usual
3 minutes STAND-BY period.
OPERATION CHECKS UPON THE UNIT
START UP
D. Remove front service panel and, if
necessary,installtherefrigerantservicegauges
on the corresponding service valves to check
both the HI and LO refrigerant pressures.
NOTE.Onaircooledmodels,thecondenser
temperature sensor, which is located within
the condenser fins, keeps the head
(condensing) pressure between preset
values.
In the event of condenser clogged - such to
preventtheproperflow ofthecoolingair- or,
in case the fan motor is out of operation, the
condenser temperature rises and when it
reaches70 ° C (160 ° F) thecondensertempe-
rature sensor shuts-off the ice maker (first
thecompressorand3'laterthegearreducer)
with the consequent light-up of the RED
WARNING LIGHT (Fig.3).
The machine will remain in OFF mode for
one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3timesin3hours,themachineSHUTS OFF
DEFINITIVELY.
After having diagnosed the reason of the
temperaturerise and removed itscause,it is
necessary to proceed as per the previous
“NOTE”to startupagain theoperationof the
ice maker.
E. Check for the correct CUT-OUT and
CUT-INofthewaterlevelsensorbyfirstshutting
closed the water shutoff valve on the water
supply line.
FIG. 4
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
T>75°C
DATA PROCESSOR
11
10
9
1
2
L
N
8
7
6
5
4
3
13
12

Page 15
Page 15
After3minutestheunitresumesitstotaloperation
with the immediate start-up of the gear motor
and, few seconds later, of the compressor.
F. Check for the correct operation of the
electronic eye of the optical ice level control, by
closing the bottom opening of the vertical ice
chute.
Wait the built up of the ice into the ice chute till it
cuts the light beam of the sensing "eyes".
Thisinterruptionwillcauseanimmediateblinking
oftheBinFullYELLOWLEDlocatedonthefront
of the P.C. Board and after about 6 seconds
causes the shutoff of the unit (compressor first
and 3' later the gear reducer) with the
simultaneouslighting (steady) of theSame LED
signalling the full bin situation (Fig.5).
Dischargetheicefromtheicechutesotoresume
the light beam previously interrupted (YELLOW
LEDblinkingfast)andafterabout 6 seconds the
flakerwillre-start-throughthe3minutesSTAND-
BYperiod-withtheextinguishingoftheYELLOW
LED.
This will cause a gradual decrease of the water
level in the float reservoir and as soon as the
level gets below the two vertical metal pins, the
flaker stops to operate (compressor first and 3'
laterthegearreducer)andtheYELLOWwarning
LED will glow to signal the shortage of water
(Fig. 4)
NOTE. The water level sensor detects the
presence of water in the float reservoir and
confirms it to the micro processor by
maintaining a low voltage current flow
between the two metal pins using the water
as conductor.
WARNING. The use of de-mineralized
water (water with no salt content) having
an electrical conductivity lower than 30
µS, will cause break with the consequent
CUT-OUTof the flaker andthe glowing of
theYELLOWLEDofwatershortage,even
with water in the reservoir.
Openingthewater supply line shutoff valve to fill
up again the float reservoir, the YELLOW LED
goes off while the RED LED starts blinking.
FIG. 5
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
DATA PROCESSOR
L
N
11
10
9
1
2
7
8
6
5
4
3
12
13

Page 16
Page 16
NOTE. The ICE LEVEL CONTROL
(INFRAREDSYSTEM) isindependentofthe
temperature however, the reliability of its
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, it is advisable to locate the unit
where it can't be reached by any direct light
beam or light radiation and to follow the
instructions for the periodical cleaning of the
light sensor elements as detailed in the
MAINTENANCE AND CLEANING PROCE-
DURES.
NOTE. During the life of the machine the Ice
Level Control may require a recalibration
mainlywhentheglassofthetwoopticaleyes
are covered by a thin lay of scale.
To do it just follow the following procedure:
• With unit OFF push and old the Button
of the PC Board
• Give power to the machine through the
external Master Switch
• Hold the PC Board Button till the leds
are ON (more or less 10 seconds)
• Release the PC Board Button
The Optical Ice Level Control is now
recalibrated.
CheckforthecorrectoperationoftheOptical
Ice Level Control by plasing a handfull of ice
in between the two eyes.
The Bin Full yellow led must start to blink/
flash immediately and, 6 seconds later, the
machine must trip OFF.
M. Ifpreviouslyinstalled,removetherefrigerant
service gauges and re-fit the unit service panels
previously removed.
N. Instruct the owner/user on the general
operation of the ice machine and about the
cleaning and care it requires.

Page 17
Page 17
WATER CIRCUIT
The water enter in the machine through the
water inlet fitting which incorporates a strainer -
located at the rear side of the cabinet - then it
goes to the water reservoir flowing through a
float valve.
NOTE.Thepresenceofthewaterinthefloat
reservoir is detected by a system of two
sensors which operates in conjunction with
the P.C. Board. The two sensors use the
water as a conductor to maintain a low
voltage current flow between them. In case
the water used is very soft (de-mineralized)
or the float reservoir gets empty the current
flow between the sensors become so weak
or is no longer maintained that, as
consequence, the P.C. Board shutoff the
flaker operation with the simultaneous
glowing of the YELLOW LED signalling
“Shortage of water”.
Thefloatreservoirispositionedatthesideofthe
freezing at such an height to be able to maintain
a constant water level. The water flows from the
reservoir into the bottom inlet of the freezer to
sorround the stainless steel auger which is
vertically fitted in the center of the freezer.
Inthefreezertheincomingwatergetschilledinto
soft (slush) ice which is moved upward by the
rotating action of the auger. The auger rotates
counter-clockwisewithinthefreezerpoweredby
a direct drive gear motor and carries the ice
upwardalongtherefrigeratedfreezerinnerwalls
andbydoingsotheicegetsprogressivelythicker
and harder.
Theice, being costantly lifted up, meet the teeth
oftheicebreakerwhichisfittedonthetopendof
theauger,whereitgetscompacted,crackedand
forced to change from vertical into horizontal
motion to be discharged out, through the ice
spout and chute, into the storage bin.
PRINCIPLE OF OPERATION
FREEZER
FLOAT TANK
FLOAT VALVE
MF 47-57
WATER INLET LINE
ICE SPOUT
FREEZER
WATER
FEED LINE
By running the ice maker, i.e. by putting the unit
underpower,startstheautomaticandcontinuous
icemakingprocesswhichwouldnotstopuntilthe
ice storage bin gets filled-up to the level of the
control“eyes”locatedontheicechute. Astheice
level raises to interrupt the light beam running
betweenthetwoinfraredleds,theunitstopsafter
six seconds (compressor first and 3' later the
gear reducer), with the simulteneous glowing of
theYELLOWLEDsignallingthe“FullBin”situation.
NOTE. The interruption of the light beam
betweenthetwolightsensorsisimmediately
signalled by the blinking of the BIN FULL
YELLOW LED located on the front of the
P.C. Board.
After about 6" of steady interruption of the
light beam the unit stops and the “Full Bin”
YELLOW LED glows steady.
The six seconds of delay prevent the unit
from stopping for any undue reason like the
momentarily interruption of the light beam
causedby the flakes thatslidesalongtheice
spout before dropping into the bin.
As some ice gets scooped out from the storage
bin, the light beam between the two sensors
resumes (fast blinking of YELLOW LED) and six
seconds later the ice machine restarts the ice
making process - going always through the 3'
stand by - and the YELLOW LED goes off.
REFRIGERANT CIRCUIT
The hot gas refrigerant discharged out from the
compressorreachesthecondenserwhere,being
cooled down, condenses into liquid.
Flowing into the liquid line it passes through the
drier filter, then it goes all the way through the
capillarytubewhereitloosessomeofitspressure
sothatitspressureandtemperaturearelowered.
Next, the refrigerant enters into the evaporator
coil wrapped around the freezer inner tube.
The water being constantly fed at the interior of
the freezer inner tube, exchan-ge heat with the
refrigerant circulating into the evaporator coil,
thiscausetherefrigeranttoboil-offandevapora-
te, thereby it changes from liquid into vapor.
The vapor refrigerant then passes through the
suctionaccumulatorandthroughthe suctionline
where the refrigerant exchanges heat with the
oneflowingintothecapillarytube(warmer)before
being sucked into the compressor to be
recirculated.
At 21°C ambient temperature refrigerant head
pressure is kept at the valve approx. 14.5 bar
(210psig)bythecondensertemperaturesensor
whichhasits probelocatedwithinthecondenser
fins - in air cooled versions.
Thiscondensertemperaturesensor,whensenses
arisingofthecondensertemperaturebeyondthe
pre-fixed limit, changes its electrical resistance

Page 18
Page 18
andsendalowvoltagepowerflowtotheMICRO-
PROCESSORoftheP.C.Boardwhichenergizes,
through a TRIAC, the Fan Motor in ON-OFF
mode.
NOTE. In case the condenser temperature
probe senses that the condenser tempera-
turehasrisedto70 ° C foroneofthefollowing
abnormal reasons:
CLOGGEDCONDENSER(Aircooledversion)
INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
FAN MOTOR OUT OF OPERATION (Air
cooled version)
AMBIENTTEMPERATUREHIGHERTHEN
43 ° C (110 ° F)
itcausesthetotalandimmediateSHUT-OFF
of the machine (compressor first and gear
motor3'later)inordertopreventtheunitfrom
operating in abnormal and dangerous
conditions.
Whenthe ice maker stops onaccount ofthis
protective device, there is a simultaneous
glowingoftheREDLED,warningtheuserof
the Hi Temperature situation.
The machine will remain in OFF mode for
one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3timesin3hours,themachineSHUTS OFF
DEFINITIVELY.
After having eliminated the source of the
excessivecondensertemperature,torestart
theicemachineitisnecessarytounplugand
plug in again.
The RED LED starts blinking and three
minuteslatertheflakerunitresumeitsnormal
operating mode. The condenser temperatu-
resensor has a further safety function which
consist in preventing the unit from operating
in Lo-ambient conditions i.e. when the
condenser temperature - equivalent to the
ambient temperature - is lower then 1 ° C
34 ° F(Fig.6).
Assoonastheambienttemperaturerisesup
to5 ° CtheP.C. Board restarts automatically
the machine on the three minutes starting
time.
The refrigerant suction or Lo-pressure sets - at
21°C ambient conditions - on the value of
1.8bar(26psig) after few minutesfromtheunit
start-up.
MF 47 - 57
ACCUMULATOR
CAPILLARY TUBE
DISCHARGE LINE
EVAPORATOR
FAN MOTOR
COMPRESSOR
CONDENSER
SUCTION LINE
FIG. 6
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
T<1°C
DATA PROCESSOR
11
10
9
1
2
L
N
8
7
6
5
4
3
13
12

Page 19
Page 19
NOTE.If,aftertenminutesfromtheunitstart
up, no ice is made and the evaporating
temperature detected by the evaporator
sensor results to be higher than -1 ° C (30 ° F)
the ice maker stops (compressor first and
gear motor 3' later) and the 5th WARNING
YELLOW LED blinks.
The machine will remain in OFF mode for
one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3timesin3hours,themachineSHUTS OFF
DEFINITIVELY.
MECHANICAL SYSTEM
The mechanical system of the SCOTSMAN
Flaker machines consists basically of a gear
motor assembly which drives, through a ratched
coupling, a worn shaft or auger placed on its
vertical axis within the freezing cylinder.
Thegearmotorismadeofasinglephaseelectric
motor with a permanent capacitor. This motor is
directly fitted in the gear case through which it
drives - in counter clockwise rotation at a speed
of 9.5 r.p.m. - the freezer auger being linked to it
by the ratched coupling.
NOTE. In the event the gear motor will
tend to rotate in the wrong direction
(counterclockwise) or not rotating at all or
rotating at lower speed the unit will stop
immediately (compressor and gear motor)
withthe glowing oftheWARNING YELLOW
LED on account of the intervention of the
ElectromagneticSafety Device-basedon
Hall Effect principle.
The machine will remain in OFF mode for
one hour then it will restart automatically.
In case the unit trips OFF again in alarm for
3timesin3hours,themachineSHUTS OFF
DEFINITIVELY.
After having diagnosed and eliminated the
source of the gear motor wrong rotation, to
restart the unit it is necessary switch OFF
and ON the power line main disconnnect
switch (Fig. 7).
The RED LED will start blinking and after 3
minutes the ice maker will resume its total
operations by running first the gear motor
and then the compressor.
Too low ambient and water temperature (well
below the limitations of respectively 10°C and
5°C- 50°Fand 40°F) or frequent interruptions of
thewatersupplytothefreezingcylinder(clogging
ofthewaterhoseconnectingthefloatreservoirto
the water inlet at the bottom of the freezer) may
causetheicetogettoohardandcompactloosing
fluidity and thereby seizing the auger.
This situation will put under excessive strain
and load the entire drive system and freezer
bearings.
FIG. 7
2
1
L
N
COMPRESSOR
9
10
11
12
13
3
4
5
6
7
8
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD
RELAYS
TRIAC
RESET
S E N S O R S
WATER
LEVEL
GEAR MOTOR ROTATION
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
TRANSF.
DATA PROCESSOR
11
10
9
1
2
L
N
8
7
6
5
4
3
13
12