Scotsman MF 26 User manual

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 26
MF 36
MF 46
MF 56
MF 66
R 134 A / R 404 AVERSION
Electronic modular
flakers and
superflakers
MS 1000.20 REV. 10/2008
SERVICE MANUAL

TABLE OF
CONTENTS
1
2
4
6
8
10
Page 1
Table of contents page
Specifications MF 26
Specifications MF 36
Specifications MF 46
Specifications MF 56
Specifications MF 66
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection - Ice maker
Unpacking and Inspection - Storage bin
Location and levelling
Electrical connections
Water supply and drain connections
Final check list
Installation practice
OPERATING INSTRUCTIONS
Start up
Operational checks
PRINCIPLE OF OPERATION (How it works)
Water circuit
Refrigerant circuit
Mechanical system
Operating pressures
Components description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the evaporator water level
Replacement of the Gear Motor Magnetic Sensor
Replacement of the auger, water seal, bearings and coupling
Replacement of the gear motor assy
Replacement of the freezing cylinder
Wiring diagram
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Cleaning instructions of water system
12
12
12
13
14
14
14
15
16
18
21
22
24
25
26
30
30
30
30
32
36
39
41
41
41

SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR FLAKER MODEL MF 26
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.
Page 2
Kg.
32 °C27 21 15 10
°C
10
21
o
o
32
38
120
115
110
105
100
95
90
85
80
Kg.
32 °C27 21 15 10
°C
10
21
o
o
32
38
120
115
110
105
100
95
90
85
80
ICE PRODUCED PER 24 HRS.
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE

MF 26 AS Air 120*
MF 26 WS Water 480*
Start Electric power cons.
Amps Kwh per 24 HR
SPECIFICATIONS
Water req.
lt/24 HR
Model Finish
Cond. unit Comp. HP
* A 15°C water temperature
S. Steel 3/8
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 3.2 17 500 11 3 x 1.5 mm210
MF 26 - MACHINE SPECIFICATIONS
Page 3
Dimensions:
HEIGHT (less legs) 525 mm.
HEIGHT (with legs) 542 mm.
WIDTH 563 mm.
DEPTH 536 mm.
WEIGHT 49 Kg.

SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR FLAKER MODEL MF 36
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.
200
180
160
140
120
Kg.
32 °C27 21 15 10
°C
10
21
o
o
32
38
190
180
170
160
150
Kg.
32 °C27 21 15 10
DE 10 A 38°C
o
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
Page 4

MF 36 AS Air 200*
MF 36 WS Water 850*
Start Electric power cons.
Amps Kwh per 24 HR
SPECIFICATIONS
Water req.
lt/24 HR
Dimensions:
HEIGHT (less legs) 525 mm.
HEIGHT (with legs) 542 mm.
WIDTH 563 mm.
DEPTH 536 mm.
WEIGHT 49 Kg.
Model Finish
Cond. unit Comp. HP
* A 15°C water temperature
S. Steel 5/8
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 4 20 760 17 3 x 1.5 mm210
MF 36 - MACHINE SPECIFICATIONS
Page 5

SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR SUPERFLAKER
MODEL MF 46
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.
Page 6
310
330
310
290
270
250
230
210
190
Kg.
°C27 21 15 10
°C
10
21
o
o
32
38
360
340
320
300
280
260
240
220
200
Kg.
32 °C27 21 15 10
°C
10
21
32
38
o
o
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32

SPECIFICATIONS
Start Electric power cons.
Amps Kwh per 24 HR
Water req.
lt/24 HR
MF 46 - 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
* A 15°C water temperature
MF 46 AS Air 320*
MF 46 WS Water 1800*
S. Steel 1
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 5.2 29 1200 26 3 x 1.5 mm 16
2
Page 7

SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR SUPERFLAKER
MODEL MF 56
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.
Page 8
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%
700
650
600
550
500
450
400
350
300
Kg.
32 °C27 21 15 10
°C
10
21
o
o
32
38
600
575
550
525
500
475
450
425
400
Kg.
°C
°C
10
21
32
38
o
o
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32 27 21 15 10

Basic electr. Amps Watts Nr. of wires Amps fuse
2000
230/50/1 10 34 45 3 x 1.5 mm216
400/50/3+N 4 22 40 5 x 1.5 mm216
SPECIFICATIONS
Start Electric power cons.
Amps Kwh per 24 HR
Water req.
lt/24 HR
MF 56 - 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
S. Steel
MF 56 AS Air 600*
MF 56 WS Water 3000*
Page 9
1.5

SPECIFICATIONS
ice making capacity
ELECTRONIC MODULAR SUPERFLAKER
MODEL MF 66
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.
Page 10
1150
1100
1050
1000
950
900
850
800
750
700
Kg.
32 °C21 15 10
°C
10
21
o
32
38
1400
1300
1200
1100
1000
900
800
700
600
500
Kg.
°C
°C
DE 10 A 38°C
o
32
38
AIR COOLED MODEL
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
27 32 21 15 1027

MF 66 AS Air 1150*
MF 66 WS Water 8000*
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/3 7,1 56 4 x 2.5 mm 25
400/50/3 + N 3,4 28 5 x 2.5 mm 16
3600 80
SPECIFICATIONS
Start Electric power cons.
Amps Kwh per 24 HR
Water req.
lt/24 HR
MF 66 - MACHINE SPECIFICATIONS
Dimensions:
HEIGHT 850 mm.
WIDTH 1065 mm.
DEPTH 698 mm.
WEIGHT 179 Kg.
Model Finish
Cond. unit Comp. HP
* A 15°C water temperature
S. Steel 2.5
2
2
Page 11

GENERAL INFORMATION AND INSTALLATION
A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
upand operation,maintenance andcleaning for
the SCOTSMAN MF 26, MF 36, MF 46, MF 56
and MF 66 Modular Icemakers.
The Electronic Flakers and Superflakers are
qualitydesigned,engineeredandmanufactured.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
4. OnmodelsMF26,MF36,MF46andMF56
remove the top and front panel while on model
MF 66 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.
5. Remove all internal support packing and
masking tape.
6. Check that refrigerant lines do not rub
againstortouchotherlinesorsurfaces,andthat
the fan blades move freely.
7. Checkthatthecompressorfitssnuglyonto
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.
Forwardthecompletedself-addressedregistra-
tion card to SCOTSMAN EUROPE/Frimont
factory.
Storage bin (B 193 S - B 393 S - B 550 S)
1. Follow the steps 1, 2 and 3 above to
unpack the storage bin.
2. Unloosethetwoboltsandremovetheprotec-
tionplatefromthedrainfittingonmodelB550S.
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.
Forwardthecompletedself-addressedregistra-
tion card to SCOTSMAN EUROPE/Frimont
factory.
Storage bin (B 1025 S - B 1350 S)
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:
B 193 S in combination with MF 26 and
MF 36
B 393 S with its companion KBT 103 Top
Cover in combination with MF 26, MF 36, MF 46
and MF 56
B 550 S with its companion KBT 1 Top
Cover in combination with MF 46 and MF 56
B 1025 S in combination with MF 46 and
MF 56
B1350SincombinationwithMF46, MF56
and MF 66.
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)Cutopenthetop ofthe cartonandremove the
polystyre protection sheet.
c) Pull out the polystyre posts from the corners
and then remove the carton.
Page 12

3. On B 393 S and B 550 S Storage Bin
inspect its top mounting gasket which should be
flat with no wrinkles, to provide a good sealing
whentheKBT1/103TopCoverisinstalledontop
of it.
4. Place the KBT 1/103 Top Cover on top of
Storage bin using care not to wrinkle or tear the
gasket.
5. On the B 1025 S and B 1350 S 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.
Installation of lift door catch (B 1025 S)
OntheStorageBinB1025Swhentheicemaker
isinstalledflushwith the binfrontit is requiredto
mount the lift door catch as detailed herebelow.
1. Open all the way the lift door in the upright
position then place the door catch on the front
face of the ice maker and tape it in place.
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. Connectthewaterdrainlinetothe1"female
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. On model B 1350 S only 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.
KBT 1/103 Top Cover
1. Follow the steps 1 and 2 above to unpack
the top cover.
2. Cut open the carton box and pull out the
KBT 1/103 Top Cover.
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) Service access: adequate space must
beleftforallserviceconnectionsthroughtherear
of 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
Page 13

2. Drill two 3 mm holes in correspondance of
the catch mounting holes.
3. Remove the tape and fasten the catch
using the two self-tapping screws supplied.
D. 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
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.
WATERSUPPLY-WATERCOOLEDMODELS
The water cooled versions of SCOTSMAN Ice
Makersrequiretwoseparateinletwatersupplies,
one for the water making the flaker ice and the
other for the water cooled condenser.
Connect the 3/4" GAS male fitting of the water
inlet, using the flexible hose supplied to the cold
watersupplylinewithregularplumbingfittingand
ashut-offvalveinstalledinanaccessibleposition
between the water supply line and the unit.
WATER DRAIN
The recommended drain tube is a plastic or
flexiblehose with18mm(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.
Theidealdrainreceptacleisatrappedandvented
floor drain.
WATER DRAIN - WATER COOLED MODELS
Connectthe3/4"GASmalefittingofthecondenser
waterdrain,utilizingasecondflexiblehosetothe
open trapped and vented drain.
Thisadditionaldrainlinemustnotinterconnectto
any other of the units drains.
NOTE.Thewater supplyandthewaterdrain
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
temperaturesarewithinaminimumof10°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
connectionsbeenmade, and isthewatersupply
shut-off valve open?
5. Has the voltage been tested and checked
against the data plate rating?
6. Hasthewatersupplypressurebeenchecked
to ensure a water pressure of at least 1 bar (14
psi).
Page 14

7. Havetheboltsholdingthecompressordown
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
8. Checkall refrigerantlines andconduitlines
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?
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 15

OPERATING INSTRUCTIONS
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections,performthefollowing“Start-up”pro-
cedure.
A. Open the water supply line shutoff valve
andputtheunitunderelectricalpowerbymoving
the main switch, on the power supply line, to the
ON position.
The first LED - GREEN - will glow to signal that
unit is under power.
NOTE.Everytimetheunitisputunderpower,
after being kept for sometime in shut-off
conditions (electrically disconnected) the
RED LED will blink for 3 minutes (60' on MF
66 only) 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/S (if unit is an air cooled version)
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.Thefirst icebitsthat drop intotheice
storagebinarenotsohardastheevaporating
temperaturehasnot yetreachedthe 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.
Page 16
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

Page 17
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

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
preventthe properflowofthecoolingair-or,
in case the fan motor is out of operation, the
condenser temperature rises and when it
reaches 70 ° C (160 ° F) for air cooled version -
and 60 ° C (140 ° F) - for water cooled version -
the condenser temperature sensor shuts-off
the ice maker (first the compressor and 3'
later the gear reducer) with the consequent
light-upoftheREDWARNINGLIGHT(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,themachine SHUTSOFF
DEFINITIVELY.
After having diagnosed the reason of the
temperatureriseand removeditscause, itis
necessary to proceed as per the previous
“NOTE”tostartupagaintheoperation ofthe
ice maker.
E. Check for the correct CUT-OUT and
CUT-INofthewaterlevelsensorbyfirstshutting
closed the water shutoff valve on the water
supply line.
Page 18
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

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 (one per each ice chute on model
MF 66) 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) oftheSame LED
signalling the full bin situation (Fig.5).
Dischargetheicefromtheicechutesotoresume
the light beam previously interrupted (YELLOW
LEDblinkingfast) and afterabout6seconds 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 theflaker andthe glowingof
theYELLOWLEDofwatershortage,even
with water in the reservoir.
Openingthewater supply lineshutoffvalve tofill
up again the float reservoir, the YELLOW LED
goes off while the RED LED starts blinking.
Page 19
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