Scotsman TC 180 User manual

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SERVICE MANUAL
TC 180
Electronic
counter nugget
ice dispenser
MS 1000.59 REV. 09/2001

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TABLE OF
CONTENTS
2
3
Table of contents page
Specifications
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection
Location and levelling
Electrical connections
Water supply and drain connections
Final check list
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
Wiring diagram
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Cleaning instructions of water system
5
5
5
5
6
6
7
8
17
18
11
11
12
13
14
20
20
20

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SPECIFICATIONS
ice making capacity
ELECTRONIC COUNTER NUGGET DISPENSER TC 180
Important operating requirements:
MIN MAX
- Air temperature 10°C (50°F) 40°C (100°F)
- Water temperature 5°C (40°F) 35°C (100°F)
- Water pressure 1 bar (14 psi) 5 bars (70 psi)
- Electr. voltage
variations fromvoltage
rating specified
on nameplate -10% +10%
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMANNUGGETDISPENSER atpeakperformancelevels,periodicmaintenance
checks must be carried out as indicated on page 21 of this manual.
32
38
10
21
150
140
130
120
110
100
90
80
70
Kg.
32 10 °C
27 21 15
°C
o
o
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.

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Start Electric power cons.
Amps Kwh per 24 HR
Basic electr. Amps Watts Nr. of wires Amps fuse
SPECIFICATIONS
Model Cond. unit Finish Comp. HP Ice bin
cap Water req. lt/24 HR
TC 180 - MACHINE SPECIFICATIONS
230/50/1 3.2 17 550 13 3 x 1.5 mm210
TC 180 AS Air S. Steel 3/8 5 Kg. 150

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GENERAL INFORMATION AND INSTALLATION
A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
up and operation, maintenance and cleaning for
the SCOTSMAN TC 180 counter nugget ice
dispenser.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
NOTE.Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
B. UNPACKING AND INSPECTION
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) Cut and remove the plastic strip securing
the carton box to the skid.
b)Cutopenthetopofthecartonandremove
the polystyre protection sheet.
c) Pull out the polystyre posts from the
corners and then remove the carton.
4. Removethe topandsidespanels oftheunit
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. Checkthatrefrigerantlinesdonotrubagainst
or touch other lines or surfaces, and that the fan
blades move freely.
7. Check that the compressor fits snugly onto
all its mounting pads.
8. Use clean damp cloth to wipe the surfaces
outside of the cabinet.
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. Removethemanufacturer’sregistrationcard
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 SCOTSMAN EUROPE
factory.
C. LOCATION AND LEVELLING
WARNING.ThisIceDispenserisdesigned
for indoor installation only. Extended
periods of operation at temperature
exceeding the following limitations will
constitute misuse under the terms of the
SCOTSMAN Manufacturer’s Limited
Warranty resulting in LOSS of warranty
coverage.
1. Position the unit in the selected permanent
location.
Criteria for selection of location include:
Min Max
Air Temperature 10°C40°C
Water Temperature 5°C35°C
Water pressure 1 bar 5 bar
Voltage -10% +10%
(Compared to the nameplate)
Serviceaccess: adequate spacemustbeleft for
allserviceconnectionsthroughtherearoftheice
maker.
Thismachine isaircooled andsucksairthrough
theleft side panel andblowsairoutthe rear side
ofthetoppanel.Donotinstallthemachinewhere
theleftsideairflowmightbeblocked.Aminimum
clearance of 15 cm is required.
It is important that the machine be installed in a
location where it has enough space around it to
be accessible for service, and minimum of 150
mm be allowed at the left and upper side for air
circulation. Try to avoid hot, dirty and crowded
locations.
NOTE. It is imperativeto do not placeon top
of the machine any sort of goods and leave
theupperlowersopenforproperairexhaust.
D. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.AllSCOTSMANicemakersrequire
a solid earth wire.
AllSCOTSMANicemachinesaresupplied from
the factory completely pre-wired and require
only 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).

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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.
PLUMBING CONNECTIONS MUST
CONFORM TO ALL APPLICABLE CODES
CONNECT TO POTABLE WATER ONLY
ThemodelTC180hasthepossibilitytohavethe
water connections through the bottom base or
through the rear bottom side of the machine. In
this second case it is necessary to remove the
rear bottom small panel.
WATER SUPPLY
Connect the 3/4" GAS male of the water inlet
fitting,using theflexibletube suppliedtothecold
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.
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
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).
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?
4. Have all the electrical and plumbing
connectionsbeen made, andisthewater supply
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).
7. Check all refrigerant lines and conduit lines
to guard against vibrations and possible failure.
8. Has the owner/user been given the User
Manualandbeeninstructedontheimportanceof
periodic maintenance checks?
9. 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.
10. Hastheownerbeengiventhenameandthe
phone number of the authorized SCOTSMAN
Service Agency serving him?

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OPERATING INSTRUCTIONS
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical connec-
tions,performthefollowing“Start-up”procedure.
A. Openthewatersupplylineshutoffvalveand
give power by moving the main switch, on the
power supply line, to the ON position.
The GREEN LED will glow to signal that unit is
under power.
NOTE.Everytimetheunitisputunderpower,
after being kept for sometime in shut-off
conditions(electricallydisconnected)the 2nd
RED LED will blink for 3 minutes (Fig.1).
FIG. 2
FIG. 1
B. Elapsedthe3minutes-standbyperiod-the
unit starts operating with the activation in
sequence of the following assemblies:
GEAR MOTOR
COMPRESSOR
FANMOTOR keptundercontrolbythecondenser
temperature sensor which has its probe within
the condenser fins
with the switching off of the 2nd RED LED
(Fig. 2).
C. Elapsed2or3minutesfromthecompressor
start up, observe that flaker ice begins dropping
off the ice spout to fall into the storage bin.

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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) the evaporating tem-
perature sensor detects such an abnormal
situation and stops consequently the unit
operation.
Inthiscircustance,the3rdwarningYELLOW
LED will blink (Fig.3).
After having diagnosed and eliminated the
cause of the poor evaporating temperature
(insufficient refrigerant in the system or
inoperativecompressororevaporatorsensor)
itisnecessarytopushtheRE-SETBUTTON
thatprotrudesthroughtheholeofthe control
box cover.
Theunit,beforeresumingthetotaloperation,
willgothroughtheusual3minutesSTAND-
BY period.
OPERATION CHECKS UPON THE UNIT
START UP
D. Remove service panels and if necessary
install the refrigerant service gauges on the
corresponding Service valves to check both the
HI and LO refrigerant pressures.
NOTE. The condenser temperature sensor,
which is located within the condenser fins,
keeps the head (condensing) pressure
between two preset valves.
Incaseofcondensercloggingsuchtoprevent
the proper flow of the cooling air or, in case
the fan motor is out of operation, the
condenser temperature rises and when it
reaches70 ° C(160 ° F)thecondensertempe-
raturesensorshuts-offtheicemakerwiththe
consequent light-up of the 2nd RED
WARNING LIGHT (Fig.4).
After having diagnosed the reason of the
temperatureriseandremoveditscause,itis
necessary to proceed as per the previous
“NOTE”tostart up again theoperationofthe
ice maker.
FIG. 4
FIG. 3

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After this, open the water supply line shutoff
valve to fill up again the float reservoir, the 5th
YELLOW LED goes off while the 2nd RED LED
starts blinking.
After3minutestheunitresumesitstotaloperation
with the immediate start-up of the gear motor
and, 2 seconds later, of the compressor.
F. Check for the correct operation of the
electronic eye for the ice bin level control, by
placing one hand between the sensing “eyes”
located in the ice spout, to interrupt the light
beam.
This interruption will cause an immediate
extinguishing of the 1st RED LED and after
about 6 seconds causes the shutoff of the unit
withthesimultaneouslightingofthe6thYELLOW
LED signalling the full bin situation (Fig.6).
Allowtheresumptionofthelightbeampreviously
interrupted and after about 6 seconds the flaker
will resume - through the 3 minutes STAND-BY
period - the ice making process with the
extinguishing of the YELLOW LED.
E. Check for the correct CUT-OUT and
CUT-IN of the float reservoir water level sen-
sorsbyshutoffthevalveonthewatersupplyline.
This will cause a gradual decrease of the water
levelinthefloatreservoirandassoonasthelevel
gets below the sensors, the flaker stops to ope-
rateandthe5thYELLOWwarningLEDwillglow
to signal the shortage of water (Fig.5).
NOTE. The water level sensor detects the
presence of sufficient water in the float
reservoir and confirms it to the micro
processor by maintaining a low voltage
current flow between the two sensors 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 the ability of the water
sensors to vanish with the consequent
CUT-OUTof theflaker operationsand the
glowing of the YELLOW LED of shortage
ofwater,eventhoughthatwaterisindeed
in the reservoir.
FIG. 6
FIG. 5

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H. CHECK OF THE DISPENSING
OPERATING MECHANISM
There are two different versions of dispensing
label;onewithjustICEandCONTINUOUSpush
buttons and a second with ICE/WATER + ICE/
WATER and CONTINUOUS push buttons.
To check for the correct operation of the
dispensing mechanism:
a) Select first the Dispensing Mode by
pushing the proper switch;
b)Placeaglassoracarafeinfrontofthetwo
Optical Dispensing Devices.
c) The dispensing drive motor and/or the
water solenoid valve starts to operate with ice
and/or water discharged through the bottom
plastic spout.
The drive motor and/or the water solenoid valve
remains in operation as per setting dispensing
time unless the glass or carafe is removed.
PushtheCONTINUOUSswitchandcheckagain
for the dispensing mechanism operation as per
steps above.
The drive motor and/or the water solenoid valve
now remains in operation till the glass or carafe
is removed.
I. Ifpreviouslyinstalled,removetherefrigerant
service gauges and re-fit the unit service panels
previously removed.
J. Instruct the owner/user on the general
operation of the ice machine and about the
cleaning and care it requires.
NOTE.TheICELEVELCONTROL(INFRA-
REDSYSTEM)isindependentofthetempe-
raturehowever, the reliability of its detection
canbeaffectedbydirtandscalesediment
whichmaydepositdirectlyonthelightsource
and on the receiver.
To prevent any possible ice maker
malfunction, due to negative affection of the
light detector, it is advisable to follow the
instructions for the periodical cleaning of
the light sensor elementsasdetailed in the
MAINTENANCE AND CLEANING PRO-
CEDURES.
G. SETTING OF THE DISPENSING
SELECTOR
Setting of the dispensing time
It'spossibletomodifythedispensingtimeto5,10
or 15 seconds.
To modify the original setting time (5 seconds):
a) Push and old the 4th switch "CONTI-
NUOUS" for 10 seconds till the first 3 lights start
to blink
b) Push the 1st switch (ICE) for 5 seconds
Push the 2
nd
switch (ICE+WATER) for 10 seconds
Push the 3st switch (WATER) for 15 seconds
Setting of resume mode (default)
To modify the original resume mode (ICE) push
for 5 seconds the desired switch ICE,
ICE+WATER or WATER.

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PRINCIPLE OF OPERATION
WATER CIRCUIT
Thewaterenterinthemachinethroughthewater
inletfitting(whichincorporatesastraineranditis
located at the rear side of the cabinet) and 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
waterasaconductortomaintainalowvoltage
currentflowbetweenthem.Incasethewater
usedis verysoft(de-mineralized)orthe float
reservoirgetsemptythecurrentflowbetween
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”.
Thefloat reservoir ispositionedatthe side ofthe
freezing cylinder at such an height to be able to
maintainaconstantwaterlevelaroundthefreezer
auger. In fact, the water flows from the reservoir
into the bottom inlet of the freezing cylinder 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 stainless steel
auger that rotates counter-clockwise within the
freezer, is powered by a direct drive gear motor
andcarriestheiceupwardalongtherefrigerated
freezer inner walls and by doing so the ice gets
progressively thicker and harder.
The ice, being costantly lifted up, meet the tooth
oftheicebreakerwhichis fittedonthetopendof
theauger,whereitgetscompacted,crackedand
forced to change from vertical into horizontal
motion to be discharged out, through the ice
spout, into the storage bin.
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” located on the sides of the ice
spout.Astheicelevelraisestointerruptthelight
beam running between the two infrared lamps,
the unit stops after six seconds, with the
simulteneous glowing of the YELLOW LED
signalling the “Full Bin” situation.
NOTE. The interruption of the light beam
betweenthetwolightsensorsisimmediately
signalledbytheextinguishingofthe1stRED
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.
The six seconds of delay prevent the unit
from stopping for any undue reason like the
momentarily interruption of the light beam
causedbytheflakesthatslidesalongtheice
spout before dropping into the bin.
As some ice gets scooped out from the storage
bin, the light beam between the two sensors
resumes and immediately the 1st RED LED
lights-up; six seconds later the ice machine
restartstheicemakingprocessandtheYELLOW
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, exchange 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
suctionaccumulatorandthroughthesuctionline
where the refrigerant exchanges heat with the
oneflowingintothecapillarytube(warmer)before
being sucked into the compressor to be
recirculated.
The refrigerant heat pressure is kept between
two pre-set values 9÷10 bar -125÷140 psig by
thecondensertemperaturesensor which has its
probe located within the condenser fins - in air
cooled versions.
This condenser temperature sensor, when
senses a rising of the condenser temperature
beyond the pre-fixed limit, changes its electrical
resistance and send a low voltage power flow to
the MICRO-PROCESSOR of the P.C. Board
which energizes, through a TRIAC, the Fan
Motor in ON-OFF mode.
FREEZER
FLOAT TANK
FLOAT VALVE
WATER INLET LINE
ICE SPOUT
FREEZER
WATER
FEED LINE

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When the opposite situation occures, i.e. the
condensertemperaturegetsbelowthe pre-fixed
limit, the temperature sensor changes again its
electrical resistance reducing therefore the
currentflow to the P.C. Board tocause a tempo-
rary stop of the Fan Motor.
NOTE. In case the condenser temperature
probesensesthatthecondensertemperatu-
re has rised to 70 ° C (160 ° F) for one of the
following abnormal reasons:
CLOGGED CONDENSER
FAN MOTOR OUT OF OPERATION
AMBIENTTEMPERATUREHIGHERTHEN
43 ° C (110 ° F)
it causes the total and immediate SHUT-
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 glowing of the 2nd
RED LED, warning the user of the Hi Tem-
perature situation. After having eliminated
the source of the excessive condenser tem-
perature, to restart the ice machine it is
necessary to push the RE-SET button that
protrudes through the control box cover.
The 2nd RED LED starts blinking and
three minutes later the flaker unit resume its
normal operating mode.
ACCUMULATOR
CAPILLARY TUBE
COMPRESSOR
DISCHARGE LINE
CONDENSER
SUCTION LINE
FAN MOTOR
EVAPORATOR
FIG. 7
The refrigerant suction or Lo-pressure sets - in
normalambient conditions (21 °C) - onthevalue
of1 bar (14 psig) afterfewminutes from the unit
start-up.
This value can vary of 0.1 or 0.2 bar (1.5 ÷ 3 psig)
in relation to the water temperture variations
influencing the freezer cylinder.
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)
theice makerstopsandthe 3RD WARNING
YELLOW LED blinks.
MECHANICAL SYSTEM
The mechanical system of the SCOTSMAN
Nugget Ice Dispenser 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 (counter-
clockwise) or not rotating at all the unit will
stop immediately with the glowing of the
3RD WARNING YELLOW LED on account
of the intervention of the Electromagnetic
SafetyDevice-basedonHallEffectprinciple.
After having diagnosed and eliminated the
source of the failure, to restart the unit it is
necessary to press the RE-SET push button
or 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.

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When the gear motor rotating speed is slowed
below 1300 r.p.m. from the normal speed of
1400 r.p.m. the Electromagnetic Safety Device
transmits an electrical signal to the
MICROPROCESSOR to stop immediately the
unit operations like it occures for the wrong
rotation,withthelighting-upofthe3RDYELLOW
WARNING LED. This to relieve from the
excessive load all the electrical and mechanical
components of the entire Drive System and
extend their durability.
NOTE.Afterhavingdiagnosedandeliminated
the source of the gear motor slow rotation to
restart the unit it is necessary to press the
RE-SET push button or switch OFF and ON
the power line main switch.
NOTE. Any time the machine stops in alarm
the front four LED's start to blink.
REFRIGERANT METERING DEVICE:
capillary tube
OPERATING PRESSURES
(With 21°C ambient temperature)
D ischarge pressure: 9 ÷10 bar (125 ÷140 psig)
Suction pressure: 1 bar (14 psig)
REFRIGERANT CHARGE (R 134 A): 370 gr
NOTE.Beforechargingtherefrigerantsystem
always check the type of refrigerant and
quantity as specified on the individual ice
machine dataplate.
Therefrigerantchargesindicatedarerelatives
to averages operating conditions.

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COMPONENT DESCRIPTION
A. EVAPORATOR TEMPERATURE
SENSOR - BLUE 2 POLES CONNECTOR
- MANUAL RESET
The evaporator sensor probe is inserted into its
tube well, which is welded on the evaporator
outlet line. It detects the temperature of the
refrigerant on the way out from the evaporator
and signals it by suppying a low voltage current
flow to the P.C. Board Micro-Processor.
According to the current received, the micro-
processor let the ice maker to continue its
operations or not. In case the evaporating tem-
perature,after 10 minutes from theunit start-up,
does not go below -1°C (30°F) the evaporator
sensor signal reaching the microprocessor is
suchto stopimmediatelythe unitoperation,with
the 3rd Warning YELLOW LED that blinks.
B. WATER LEVEL SENSOR - RED TWO
POLES CONNECTOR - AUTOMATIC
RESET
Thissensorsystemconsistoftwosmallstainless
steelrodsvertically fitted on the innerfaceofthe
reservoircoverand electrically connected to the
low voltage circuit of the P.C. Board. When the
coverofthereservoirispositionedinitsplacethe
tips of both the rods dip into the reservoir water
and detects and signals its presence by supply
power back to the P.C. Board.
NOTE. In the event of shortage of water in
thereservoiror,incasethewaterusedistoo
soft (de-mineralized) to cause greater
resistence to the current flow (conductivity
lowerthan30 µ S)thissensorsystemcauses
the shutoff of the machine, to protect it
fromrunningwithaninterruptedorinadequate
water supply.
In this situation the 5th YELLOW LED will
glow to warn of the machine shutoff and the
reason why.
C. CONDENSER TEMPERATURE SENSOR
- BLACK TWO POLES CONNECTOR -
MANUAL RESET
The condenser temperature sensor probe,
located within the condenser fins detects the
condenser temperature variations and signals
them by supplying current, at low voltage, to the
P.C. BOARD.
In relation to the different current received, the
micro processor of the P.C. BOARD supplies,
through a TRIAC, the power at high voltage to
the fan motor so that it can cool the condenser
and reduce its temperature.
In the event the condenser temperature rises
and reaches 70°C the current arriving to the
micro processor is such to cause an immediate
and total stop of the machine operation with the
glowing of the 2nd RED WARNING LED.
NOTE. To restart the unit after the shutoff
caused by the hi condenser temperature, it
is necessary to push the RE-SET button
(after having remedied to the causes of unit
stoppage) or to switch OFF and ON the
power line main disconnect Switch.
D. GEAR MOTOR ROTATION AND SPEED
SENSOR - RED FOUR POLES
CONNECTOR - MANUAL RESET
This safety device is housed on top of the Drive
Motoranddetects-basedonHallEffectprinciple
- the rotating speed and rotating direction of the
drive Motor.
Should the rotating speed drop below
1300 r.p.m. the magnitude measured by this
device is such to signal to the microprocessor to
stop the unit and light-up the 3rd YELLOW LED.
Thesamereactionoccureswhenthedrivemotor
will tend to rotate in the wrong direction
(counterclockwise) or it doesn't rotate at all.
NOTE. To restart the unit after the shutoff
caused by this safety device, it is necessary
firsttoeliminatethecausethathasgenerated
theinterventionofthedeviceandthenpress
the RE-SET push button or switch OFF and
ON the power line main disconnect switch.
E. ICEBINLEVELLIGHTCONTROL-BLACK
FOUR POLES CONNECTOR -
AUTOMATIC RESET
The electronic ice bin level control, located into
theicespout,hasthefunctiontostoptheoperation
oftheicemachine when the light beam between
the light source and the sensor gets interrupted
by the flake ice which accumulates in the spout.
When the light beam is interrupted the 1st RED
LEDlocatedinthefrontoftheP.C.BOARDgoes
off; in case the light beam gets interrupted for as
longas6seconds,theicemachinestopswiththe
glowing-up of the 6th YELLOW LED to monitor
the full ice bin situation.
The 6 seconds of delay prevents that any
minimuminterruptionofthelightbeamduetothe
regular ice chuting through the ice spout may
stop the operation of the unit.
As soon as the ice is scooped out (with the
resumption of the light beam between the two
infraredsensoroficelevel control)theREDLED
lights up and after 6 seconds the ice machine
resume its operation with the simultaneous
extinguishing the 6th YELLOW LED.
F. ICE/WATER OPTICAL DISPENSING
DEVICE - BLUE FOUR POLES CONNECTOR
Located on the front of the dispensing area it
consists of the combination of an infrared
Transmitter and Receiver.
When a glass or a carafe is placed in front of the
Infrared sources, the optical device transmits a
signal to the PC Board that is equivalent to
activate the dispensing drive motor which, in

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turn,putinrotationadispensingvanethatpushes
the ice towards a rectangular opening located in
the bottom of the storage bin.
Elapsedthedispensingtime(5,10or15seconds
according to the setting) or after have removed
the glass/carafe, the infrared resume its original
conditionswitchingoffthedispensingdrivemotor.
G. FRONT DISPENSING SELECTOR/
DISPLAY - BLACK SIX POLES CONNECTOR
Placed in the upper front part of the dispensing
area it is used to select, according to the version
of the machine:
a) Ice (first switch)
or a) Ice (first switch)
b) Ice and water (second switch)
c) Water - not chilled - (third switch)
It is also possible to set up for "continuous"
dispensingoperationjustpushingthefourthswitch
before or after the selection of the dispensed
product.
Once completed the dispensing selector/display
resumes its original dispensing setting mode.
NOTE. It is possible to modify the original
resume mode (default) by pushing for 5
seconds the corresponding switch (all
machinesaresuppliedfromthefactoryinthe
ICE dispensing mode).
It is also possible to modify the dispensing
timecontrolledbythePCBoardto5,10or15
seconds by:
a)Push and olt the 4
th
switch "continuous"
for approximately 10 seconds till the first 3
lights start to blink
b) Pushingthe1
st
switch(ICE)isequivalent
to 5 seconds
Pushing the 2
nd
switch (ICE+WATER) is
equivalent to 10 seconds
Pushingthe3
rd
switch(WATER)isequiva-
lent to 15 seconds.
H. P.C. BOARD (Data processor)
The P.C. BOARD, fitted in its plastic box located
intherightsideoftheunit,consistsoftwoseparated
printed circuits one at high and the other at low
voltage,protected by three fuses, integrated with
a RE-SET button. Also it consists of six aligned
LEDS monitoring the operation of the machine
and of input terminals for the leads of the sensor
probes as well as input and output terminals for
the leads of the ice maker electrical wires.
The P.C. BOARD is the brain of the system and
it elaborates, through its micro processor, the
signals received from the sensors in order to
control the operation of the different electrical
componentsof the icemaker(compressor,gear
motor, etc.) as well as the dispensing of the ice
and water.
The six LEDS, placed in a row in the front of the
P.C. BOARD, monitor from right to left the
following situations:
RED LIGHT
Empty storage bin
RED LIGHT
ON all the time
- Unit shut-off due to a too hi-condensing
temperature > 70°C
Blinking
- 3 minutes start up delay time
YELLOW LIGHT
ON all the time
- Unit shut-off due to the wrong rotation
direction of gear motor
- Unit shut-off due to the too lo speed
of gear motor
Blinking
- Unit shut-off due to a
too hi-evaporating temp.
>-1°C after 10 min of operation
GREEN LIGHT
- Unit under electrical power
YELLOW LIGHT
- Unit shut-off due to a too lo-water level into
float tank
YELLOW LIGHT
- Unit shut-off at full storage bin

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I. FLOAT RESERVOIR
Thefloatreservoirconsistsofaplasticwaterpan
on which is fitted a float valve with its setting
screw. The float valve modulate the incoming
water flow to maintain a constant water level in
thereservoir,levelthatcorrespondstotheonein
the freezing cylinder to ensure proper ice
formation and fluidity.
Onthe inner side of thereservoir cover are fitted
the two water level sensors which detects the
presenceortheshortageofwaterinthereservoir.
NOTE.Itisveryimportanttomakesureofthe
correct fitting of the cover on the reservoir in
ordertoenablethesensortoefficientlycontrol
the water situation avoiding undue shutoff
interventions.
J. FREEZING CYLINDER (EVAPORATOR)
Thefreezingcylinderismade ofastainlesssteel
verticaltubeonwhichexterioriswrappedaround
the cooling coil with the evaporating chamber
and in its interior is located the auger which
rotates on its vertical axis and it is maintained
aligned by the top and bottom bearings. A water
seal system is located in the bottom part of the
freezer while at the top end is fitted the ice
breaker.
The water constantly flowing into the cylinder
bottompart,freezesintoicewhenincontactwith
the cylinder inner walls. The ice is then lifted up
by the rotating auger and compacted and forced
out by the ice breaker.
K. ICE BREAKER
The ice breaker is made by several rectangular
openingswheretheiceisforcedtopassthrough.
By undergoing this, the ice looses its excess of
water content so it drops into the bin in hard dry
bits of ice.
In the ice breaker it is housed the top bearing
whichismade of two rolls bearingspositionedto
withstand the auger axial and radial loads. This
bearing is lubricated with a food grade - water
resistant grease.
NOTE.Itisadvisabletochecktheconditions
ofboththelubricantgreaseandthebearings
every six months.
L. DRIVE GEAR MOTOR
This motoreducer is made of a single phase
electric motor with permanent capacitor directly
fitted on a gear box.
The drive motor rotor is kept aligned on its
vertical axis by two ball bearings permanently
lubricated. The gear case contains a train of
three spur gears the first one of which is in fiber
to limit the noise level. All the three gears are
encased in case bearings and are covered by
lubricant grease (MOBILPLEX IP 44).
Two seal rings, one fitted on the rotor shaft and
the other on the output shaft keep the gear case
sealed.
Hovewer, the interior can be inspected and
serviced by unbolting the two halves of the
aluminium gear case housing.
Thegearreduceroutputshaftisconnectedtothe
freezer auger by a ratched coupling which is
made of two toothed halves that engages
themselves only if turned in the correct direction
namely, conterclockwise.
M. FAN MOTOR (Air cooled version)
The fan motor is controlled through the P.C.
BOARDandtheTRIACbythecondensertempe-
raturesensor.Normallyitoperatestodrawcooling
air through the condenser fins.
In cold ambient situation, the fan motor can run
atintermittanceasthecondenserpressuremust
be kept between two corresponding head
pressure values.
N. COMPRESSOR
The hermetic compressor is the heart of the
refrigerant system and it is used to circulate and
retrieve the refrigerant throughout the entire
system. It compresses the low pressure
refrigerant vapor causing its temperature to rise
and become high pressure hot vapor which is
then released through the discharge valve.
O. ICE DISPENSER DRIVE MOTOR
Located on the upper side of the storage bin, it
turnbyamilledshaftthedispensingvaneplaced
inside the round storage bin.
By rotating, the dispensing vane pushes the ice
towards the bottom rectangular opening so to
force the nugget ice to go through the bottom
outlet spout.
P. STORAGE BIN
Round shaped it is located in the front of the ice
machine and has the main reason to store the
nugget ice produced by the evaporator till it
reaches its maximum level controlled by an
infraredopticalsystem.Initsbottomisplacedthe
ice spout as well as the water drain hole.
Inside the ice spout opening is also located the
water outlet tube connected to the solenoid val-
ve.
Q. DISPENSINGWATERSOLENOIDVALVE
Energized and controlled by the PC Board, it
allows a metered quantity of not chilled water to
be dispensed through the same opening of the
ice.

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Page 17
WIRING DIAGRAM
AIR AND WATER COOLED
230/50/1 B - WHITE
G - GREY
N - BLACK
A - BLUE
M - BROWN
GV - YELLOW GREEN

Page 18
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SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Unit will not run Blown fuse in P.C.Board Replace fuse & check for cause of
No LED lighted-up blown fuse
Master switch in OFF position Turn switch to ON position
Inoperative P.C.Board Replace P.C.Board
Loose electrical connections Check wiring
6th Yellow LED glows Inoperative or dirty ice level control Replace or clean ice level control
5th Yellow LED Shortage or too soft water See remedies for shortage of water
glows or install a mineral salt metering
device
2nd LED glows High head pressure Dirty condenser. Clean
Inoperative fan motor. Replace
3rd Yellow LED blinks Too hi evap. temperature Checkandchargerefrigerantsystem
Shortage or lack of refrigerant
3rd Yellow LED glows Gear motor tends to run on reverse Check gear motor capacitor
Too low gear motor rotating speed Check rotor bearings, freezer
bearings and interior of freezer for
scores. Replace whatever worn or
damaged.
No rotation of gear motor Check for power to drive motor
(16 A fuses)
Check for stator winding
Gear motor starts and stop Check for correct operation of drive
after a while motor magnetic sensor
Check for correct magnetic capacity
of magnetic cylinder
Compressor cycles intermittently Low voltage Check circuit for overloading
Check voltage at the supply to the
building. If low, contact the power
company
Non-condensable gas in system Purge the system
Compressor starting device with Check for loose wires in starting
loose wires device
Low ice production Capillary tube partially restricted Blow charge, add new gas & drier,
afterevacuatingsystemwithvacuum
pump
Moisture in the system Same as above
Low water level in the freezer Adjust to approx 20 mm below ice
spout
Shortage of refrigerant Check for leaks & recharge
Pitted or stained auger surface Clean or replace auger
SERVICE DIAGNOSIS

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Page 19
SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Wet ice Ambinet temperature too high Move unit to cooler location
High water level in the freezer Lower to approx. 20 mm below
ice spout
Faulty compressor Replace
Machine runs but makes no ice Water not entering in the freezer Air look in feed line to freezer.
Clogged feed line to freezer. Clean it
Gear stripped Check and repair
Moisture in the system Purge, replace drier and re-charge
Water leaks Water seal leaking Replace water seal
Water feed line to freezer leaking Check and fasten hose clamp
Float valve not closing Check and adjust float valve
setting screw
Excessive noise or chattering Mineral or scale deposit on auger Remove and manually polish auger
and inner freezer walls and inner walls of freezer barrel
using emery paper
Low suction pressure
Add refrigerant to rise suction pressure
Water feed line to freezer clogged Vent and clean it
Low water level into freezer Adjust to approx. 20 mm below
ice spout
Gear motor noise Worn rotor bearings Check and replace
Shortage or poor lubricant in gear Check for proper lubricant opening
case gear case.
Top of gears must be covered
with lubricant
Gear case bearings and gear Check and replace worn parts
racers worn out
Shortage of water
Strainer at water inlet fitting clogged Remove strainer and clean
Float reservoir water nozzle Remove float valve and clean
clogged-up nozzle
SERVICE DIAGNOSIS

Page 20
Page 20
MAINTENANCE AND CLEANING INSTRUCTION
A. GENERAL
Theperiodsandtheproceduresformaintenance
and cleaning are given as guides and are not to
be construed as absolute or invariable.
Cleaning, especially, will vary depending upon
local water and ambient conditions and the ice
volume produced; and, each icemaker must be
maintened individually, in accordance with its
particular location requirements.
B. ICEMAKER
Thefollowingmaintenanceshouldbescheduled
at least two times per year on these icemakers.
1. Check and clean the water line strainer.
2. Remove the cover from the float reservoir -
care to do not damage the two water sensors -
and depress the float to make sure that a full
stream of water enters into the reservoir.
3. Checkthattheicemakerislevelledinsideto
side and in front to rear directions.
4. Check that the water level in the water
reservoir is below the overflow but high enough
that it does not run out of the spout opening.
NOTE. The float must close positively the
incomingwaterflowwhentherubberhoused
in the setting screw, is perpendicular to the
water nozzle.
5. Clean the water system, water reservoir
and the interior of freezing cylinder using a
solution of SCOTSMAN Ice Machine Cleaner.
Refer to procedure C cleaning instructions and
aftercleaningwill indicate frequency and proce-
dure to be followed in local areas.
NOTE. Cleaning requirements vary
according to the local water conditions and
individual user operation.
6. If required, polish the two sensor rods
securedtothe float reservoir cover, heavy scale
sedimentonthemcanberemovedwiththehelp
of a bit of SCOTSMAN Cleaner plain.
7. With the ice machine and fan motor OFF
clean condenser using vacuum cleaner, whisk
broomornonmetallicbrushtakingcaretodonot
damage the condenser temperature sensor.
8. Checkfor water leaks and tighten drain line
connections. Pour water into the sink to be sure
that drain line is open and clear.
9. Check the ice level control sensor to test
shut-off. Put your hand between the light source
andthe receiverontheupper side ofthestorage
bin so to cut off the light beam for at least 6
seconds.
This should cause the immediate extinguishing
of the 1st RED LED located in the front face of
P.C.Boardand,6secondslater,thetotalstopping
oftheicemakerwiththe simultaneouslightupof
the 6th Yellow LED.
Withinfewsecondsfromtheremovalofthehand
from between the sensor lights the ice maker
resume its operation.
NOTE. The ice level control uses devices
that sense light, therefore they must be kept
clean enough so they can “see”.
Every month clean/wipe the sensing “eyes”
with a clean soft cloth.
10. Check for refrigerant leaks and for proper
frostline, which should frost as faras approx. 20
cm (8") from the compressor.
When doubtful about refrigerant charge, install
refrigerant gauges on corresponding Schräder
valvesandcheckforcorrectrefrigerantpressures.
(See Operating pressure at page 19 of this
manual).
11. Check that fan blades move freely and are
not touching any surfaces.
12. Remove the ice spout cover, unloose the
bolt securing the casting ice sweep and remove
it; then inspect the top bearing, wipe clean of all
grease and apply a coating of food grade water
proof grease P/N 263612.00.
NOTE. It is recommended to use only food
gradeandwaterproofgreasetolubricatethe
freezer top bearing.
13. Turntheicedispensingspoutandremoveit.
Wash and sanitise it.
14. Remove the sink grill for washing and
sanitising.
C. CLEANING INSTRUCTIONS OF WATER
SYSTEM
1. Switch OFF the Master disconnect switch
on the power line.
2. Remove the top panel and later the top
cover of storage bin with the dispensing drive
motor.
3. Removeall ice stored in the bin to prevent it
from getting contaminated with the cleaning
solution.