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Scotsman Ice SrlVia Lainate, 31 - 20010 Pogliano M.se - Milano - ItalyTel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500Direct Line to Service & Parts:Phone +39-02-93960350 - Fax +39-02-93540449Website: www.scotsman-ice.itE-Mail: [email protected]
ISO 9001 - Cert. n. 0080
MC 46Electronic
modular cubersNew PC Board
From s.n. 28850
REV. 09/2015
SERVICE MANUAL
LED STATUS REASON WHY - SIGNIFICATION - SIGNIFICATO
ON STEADYFIXE
FISSO
FREEZING CYCLEEN RÉFRIGÉRATIONIN CONGELAMENTO
BLINKINGCLIGNOTANT
LAMPEGGIANTE
60 MINUTES DELAY AT START UP JUMPER J3 OUT60 MINUTES DE RETARD AU DEMARRAGE - CAVALIER J3 OUVERTE60 MINUTI RITARDO PARTENZA - CONTATTI J3 APERTI
ON STEADYFIXE
FISSO
TOO HI DISCHARGE PRESSURE/TEMP.COUPURE HPFERMATA ALTA TEMP. CONDENSAZIONE
BLINKINGCLIGNOTANT
LAMPEGGIANTE
TOO HI EVAP. TEMP. (> 0°C) AFTER 15’ FROM START UPCOUPURE BP ( > 0°C LU PAR LA SONDE EVAP. NON ATTEINTE APRES 15’ FONCT.)TEMP. EVAP. > 0°C DOPO 15’ DA INIZIO CONGELAMENTO
ON STEADYFIXE
FISSO
UNIT OFF AT BIN FULLCABINE PLEINECONTENITORE PIENO
BLINKING SLOWCLIGNOTANT LENTLAMPEGG. LENTO
I/R BEAM CUTTEDFAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE INTERROMPURAGGIO INFRAROSSO INTERROTTO
BLINKING FASTCLIGNOTANT RAPIDELAMPEGG. VELOCE
I/R ON AFTER TRIP OFF AT BIN FULLFAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE ETABLIRAGGIO INFRAROSSO RIPRISTINATO DOPO FERMATA A CONT. PIENO
ON STEADYFIXE
FISSO
I/R CALIBRATION DONECALIBRATION FAISCEAU INFRA ROUGE CELL. NIVEAU GLACE REALISÉCALIBRAZIONE RAGGIO INFRAROSSO EFFETTUATA
BLINKINGCLIGNOTANT
LAMPEGGIANTE
UNIT IN CLEANING MODE OR TRIPPING OFF AFTER TEST - JUMPER TEST INMACHINE EN MODE DETARTRAGE OU ARRÊTE APRES LE TEST - CAVALIER TEST FERMÉMACCHINA NELLA FASE LAVAGGIO O FERMA DOPO IL TEST - PONTICELLO TEST CHIUSO
ON STEADYFIXE
FISSO
CONDENSER SENSOR OUT OF ORDERSONDE CONDENSEUR HSSONDA CONDENSATORE MALFUNZIONANTE
BLINKINGCLIGNOTANT
LAMPEGGIANTE
EVAPORATOR SENSOR OUT OF ORDERSONDE EVAPORATEURS HSSONDA EVAPORATORE MALFUNZIONANTE
BLINKING ALTERNATIV.CLIGNOTANT ALTERNÉLAMPEGGIO ALTERN.
I/R SENSOR OUT OF ORDERSONDE INFRA ROUGE CELLULE NIVEAU GLACE HSSONDA ALL’INFRAROSSO LIVELLO GHIACCIO MALFUNZIONANTE
PUSH
PUSH > 5” DURING WATER FILLING TO MOVE THE UNIT INTO FREEZINGPUSH > 5” DURING FREEZING TO MOVE THE UNIT INTO DEFROSTPUSH > 5” DURING DEFROST TO MOVE THE UNIT INTO FREEZING
PUSH 2” ÷ 5” DURING WATER FILLING TO MOVE THE UNIT INTO CLEANINGPUSH DURING THE 60 MIN START UP DELAY TIME TO BY-PASS IT
STARTAMPS
MC 16 SHORT A - 230 VMC 16 SHORT W - 230 VMC 16 SHORT A - 400 VMC 16 SHORT W - 400 VMC 46 A - 230 VMC 46 W - 230 VMC 46 A - 400 VMC 46 W - 400 V
MC 1210 A - 400 V
MC 1210 W - 400 V
AMPS WATTS KWH/24HRSREFR. CHARGE
R404aSUCT. PRESS.END. FREEZE
DISCHARGEPRESSURE
7,1
3
10
5,5
11
32
18
66
14
28
1300
1400
2400
4800
580 gr450 gr580 gr450 gr
1300 gr700 gr
1300 gr700 gr
2 x 1300 gr
2 x 700 gr
1,6 ÷ 1,7 bar
1,6 ÷ 1,7 bar
2,5 bar
16 ÷ 18 bar17 bar
16 ÷ 18 bar17 bar
16 ÷ 18 bar17 bar
16 ÷ 18 bar17 bar
13 ÷ 14 bar13,5 ÷ 14,5 bar
14 bar
1 2 3 4
MCS 16 AMCS 16 WMCM 16 AMCM 16 WMCL 16 AMCL 16 WMCS 46 AMCS 46 WMCM 46-1210 AMCM 46-1210 WMCL 46-1210 AMCL 46-1210 WMCXL 46 W
5 6 7 8 9 10ONONOFFOFFOFFOFFONONONOFFONONOFF
OFFOFFOFFOFFOFFOFFOFFOFFONONONONON
ONONONONOFFOFFONONOFFOFFONONOFF
ONONONONONONONONONONOFFOFFOFF
OFFOFFOFFOFFOFFOFFONONONONONONOFF
ONONONONONONONONONONONONON
ONONONONONONOFFOFFOFFOFFOFFOFFON
ONONONONONONONONONONONONOFF
ONONONONONONONONONONONONON
ONOFFONOFFONOFFONOFFONOFFONOFFOFF
DIP SWITCH FACTORY SETTING COMBINATIONS (PER MODEL AND VERSION)COMBINAISON DES COMMUTATEURS NUMERIQUES DU DIP SWITCH POUR MODELES ET VERSIONS
REGOLAZIONE TASTI DIP SWITCH PER MODELLO E VERSIONE
DIP SWITCH
FREEZING CYCLECYCLE DE CONGÉLATIONCICLO CONGELAMENTO
DEFROST CYCLECYCLE DE DÉMOULAGECICLO SBRINAMENTO
15/30"
1 2 3 4
ON ON ON ON 1 min.
OFF ON ON ON 3 min.
ON OFF ON ON 5 min.
OFF OFF ON ON 7 min.
ON ON OFF ON 9 min.
OFF ON OFF ON 11 min.
ON OFF OFF ON 13 min.
OFF OFF OFF ON 15 min.
ON ON ON OFF 17 min.
OFF ON ON OFF 19 min.
ON OFF ON OFF 21 min.
OFF OFF ON OFF 23 min.
ON ON OFF OFF 25 min.
TIMED PORTION FREEZING CYCLETEMPS PHASE TEMPORISÉE CONGELATION
TEMPI FASE TEMPORIZZATA CONGELAMENTO
7 8
OFF OFFWATER PUMP OFF DURING DEFROSTPOMPE A L’ARRÊT PEND. DEGIVRAGE
POMPA ACQUA DURANTE SBRINAMENTO
7 8
ON ON 0
OFF ON 30 sec.
ON OFF 60 sec.
ADDITIONAL DEFROST TIMETEMPS AJOUTÉS
TEMPI AGG. SCONGELAMENTO
AIR/EAUARIA/ACQUA
27,6
28,0
50
105
Page 2Page 2
TABLE OFCONTENTS
Table of contentsSpecifications MC 46
GENERAL INFORMATION AND INSTALLATION
IntroductionUnpacking and Inspection - Ice makerUnpacking and Inspection - Storage binLocation and levellingStacking installationElectrical connectionsWater supply and drain connectionsFinal check listInstallation practice
OPERATING INSTRUCTIONS
Start upOperatiobnal checks
OPERATING PRINCIPLES (How it works)
Freezing cycleHarvest cycleControl sequenceComponent description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the cube sizeWiring diagramService diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
GeneralIcemakerCleaning instructions of water system
23
15171819
2425-26-27
28
303031
1011
555568889
Page 3Page 3
310
300
290
280
270
260
250
240
230
220
210
200
190
180
K g .
32 10 °C27 21 15
MODÈLES REFROIDIS PAR AIR
TEMPÉRATURE DE L'EAU
TE
MP
ÉR
AT
UR
E A
MB
IAN
TE
PR
OD
UC
TIO
N D
E G
LAC
E E
N 2
4 H
32
38
10
21
°C
MODÈLES REFROIDIS PAR EAU
310
300
290
280
270
260
250
240
230
220
210
200
190
180
K g .
32 10 °C27 21 15
TEMPÉRATURE DE L'EAU
TE
MP
ÉR
AT
UR
E A
MB
IAN
TE
PR
OD
UC
TIO
N D
E G
LAC
E E
N 2
4 H
10
21
32
38
°C
ice making capacityAIR COOLED MODELS
AM
BIE
NT
TE
MP
ER
AT
UR
E
WATER TEMPERATURE
ICE
PR
OD
UC
ED
PE
R 2
4 H
RS
AM
BIE
NT
TE
MP
ER
AT
UR
E
WATER TEMPERATURE
ICE
PR
OD
UC
ED
PE
R 2
4 H
RS
WATER COOLED MODELS
SPECIFICATIONS
ELECTRONIC CUBER MODEL MC 46
Important operating requirements:
MIN.Air temperature 10°C (50°F)Water temperature 5°C (40°C)Water pressure 1 bar (14 psi)Electr. voltage variationsfrom voltage ratingspecified on nameplate -10%
MAX.40°C (100°F)35°C (90°F)
5 bars (70 psi)
+10%
NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, watertemperature and age of the machine.To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenancechecks must be carried out as indicated on maintenance section of this manual.Production charts shown are indicating the production of MCM and MCL models. For MCS modelsice production is approx. 10% lower.
Page 4Page 4
MC 46 AS 6 Air Stainless steel MC 46 WS 6 Water Stainless steel
2.5
Model Cond. unit Finish Comp. HP Water req. - lt/24 HR
SPECIFICATIONS
6603700*
MC 46 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 874 mm.WIDTH 1074 mm.DEPTH 534 mm.WEIGHT 185 Kgs.
ACCESSORIES
KSC 11: Cube stacking kit
220-230/50/1 7 2400 50 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N 10 66 3 x 1.5 m/m2 20400/50/3N 5.5 14 5 x 1.5 m/m2 10
Starts Electric power cons.amps. Kwh x 24 HR
Cubes per harvest: MCL-46 144 large - MCM-46 204 medium - MCS 46 396 small* At 15°C (60°F) water temperature
Page 5Page 5
A. INTRODUCTION
This manual provides the specifications and thestep-by-step procedures for the installation, start-up and operation, maintenance and cleaning forthe SCOTSMAN MODULAR CUBERS .The Electronic Modular Cubers are qualitydesigned, engineered and manufactured.Their ice making systems are thoroughly testedproviding the utmost in flexibility to fit the needsof a particular user.These icemakers have been engineered to ourown rigid safety and performence standards.
NOTE. To retain the safety and performancebuilt into this icemaker, it is important thatinstallation and maintenance be conductedin the manner outlined in this manual.
Storage Bin
Since the MC series Modular Cubers do nothave their own attached ice storage bins, it isnecessary to use an auxiliary bin such as the BinSB 550.
B. UNPACKING AND INSPECTION
Modular Cuber
1. Call your authorized SCOTSMAN Distributoror Dealer for proper installation.
2. Visually inspect the exterior of the packingand skid. Any severe damage noted should bereported to the delivering carrier and a concealeddamage claim form filled in subjet to inspectionof the contents with the carrier’s representativepresent.
3. a) Cut and remove the plastic strip securingthe carton box to the skid.
b) Remove the packing nails securing thecarton box to the skid.
c) Cut open the top of the carton and removethe polystyre protection sheet.
d) Pull out the polystyre posts from thecorners and then remove the carton.
4. Remove top and sides panels of the unitand inspect for any concealed damage. Notifycarrier of your claim for the concealed damageas stated in step 2 above.
5. Loose two nuts on left and rights side of theunit base and remove it from the skid. Save thetwo bolts and nuts to mount the machine onstorage bin or on top of another Modular Cuber.
GENERAL INFORMATION AND INSTALLATION
6. Remove all internal support packing andmasking tape and the hardware package.
7. Check that refrigerant lines do not rubagainst or touch other lines or surfaces, and thatthe fan blade moveS freely.
8. Check that the compressor fits snugly ontoall its mounting pads.
9. See data plate on the rear side of the unitand check that local main voltage correspondswith the voltage specified on it.
CAUTION. Incorrect voltage supplied tothe icemaker will void your partsreplacement program.
10. Remove the manufacturer’s registrationcard from the inside of the User Manual and fill-in all parts including: Model and Serial Numbertaken from the data plate.Forward the completed self-addressedregistration card to Frimont/Scotsman Europefactory.
C. LOCATION AND LEVELLING
WARNING. This Ice Cuber is designedfor indoor installation only. Extendedperiods of operation at temperatureexceeding the following limitations willconstitute misuse under the terms ofthe SCOTSMAN Manufacturer’s LimitedWarranty resulting in LOSS of warrantycoverage.
1. Position the Bin in the selected permanentlocation. Criteria for selection of location include:
a) Minimum room temperature 10°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 cooledmodels.
d) Service access: adequate space mustbe left for all service connections through therear of the ice maker. A minimum clearance of 15cm (6") must be left at the sides of the unit forrouting cooling air drawn into and exhausted outof the compartment to maintain propercondensing operation of air cooled models.
Page 6Page 6
2. Level the Storage Bin Assy in both the leftto right and front to rear directions by means ofthe adjustable legs.
3. Inspect the Storage Bin top mounting gasketwhich should be flat with no wrinkles, to providea good sealing when the Modular Cuber isinstalled on top of it.
4. Place the Modular Cuber on top ofStorage bin using care not to wrinkle or tearthe gasket.
5. Lift a little bit the Modular Cuber right side inorder to be able to mount the ice level controlbracket taking care to align the hole located onunit base to mate with the one on the top of theBin.
6. Remove the PVC plastic plug closing theround hole located on the right side of the icechute opening.
7. Trace the ice level control assy, secured forthe transport on top of the evaporator of theModular Cuber, and direct it down through theround hole into the Storage Bin.
8. Fasten the ice level control assy on itsbracket by means of the two screws found in thehardware package supplied with the unit.
9. Make a cut (shear) in the PVC plastic plugthat goes from its edge to the center; insert theice level control cable in the center of the plasticplug so to prevent it from any sort of contact withthe unit frame, then place again the PVC plug inthe round hole keeping the cable exceedingportion inside the unit.
10. Install the plastic ice cube deflector byhooking it on the flange of the ice chute openingin unit base (see illustration).
11. Secure the Modular Cuber on the top of theStorage Bin using the two bolts and diber washerfound in the hardware package supplied with theunit.
D. STACKING INSTALLATION
A Stacking Kit KSC 11 is available as an accessoryon request to allow the installation of two ModularCubers one on top of the other.
The Stacking Kit is consisting of:a) unit base gasketb) plastic reinforced ice chute connections
Use the ice chute connections supplied in theKSC Kits..........
... to connect the ice chute of the bottom machinewith the one of the top machine
Page 7Page 7
Page 8Page 8
E. ELECTRICAL CONNECTIONS
See data plate for current requirements todetermine wire size to be used for electricalconnections. All SCOTSMAN icemakers requirea solid earth wire.All SCOTSMAN ice machines are supplied fromthe factory completely pre-wired and require onlyelectrical power connections to the wire cordprovided at the rear of the unit.Make sure that the ice machine is connected toits own circuit and individually fused (see dataplate for fuse size).The maximum allowable voltage variation shouldnot exceed -10% and +10% of the data platerating. Low voltage can cause faulty functioningand may be responsible for serious damage tothe overload switch and motor windings.
NOTE. All external wiring should conform tonational, state and local standards andregulations.
Check voltage on the line and the ice maker’sdata plate before connecting the unit.
F. WATER SUPPLY AND DRAINCONNECTIONS
General
When choosing the water supply for the ice flakerconsideration should be given to:a) Length of runb) Water clarity and purityc) Adequate water supply pressure
Since water is the most important single ingredientin producting ice you cannot emphasize toomuch the three items listed above.Low water pressure, below 1 bar may causemalfunction of the ice maker unit.Water containing excessive minerals will tend toproduce cloudy coloured ice cubes, plus scalebuild-up on parts of the water system.
Water supplyConnect the 3/4" GAS male fitting of the solenoidwater inlet valve, using flexible tubing or a 3/8"O.D. copper pipe, to the cold water supply linewith regular plumbing fitting and a shut-off valveinstalled in an accessible position between thewater supply line and the unit.
Water supply - Water cooled modelsThe water cooled versions of SCOTSMAN IceMakers require two separate inlet water supplies,one for the water sprayed for making the icecubes and the other for the water cooledcondenser.Connect the 3/4" GAS male fitting of the waterinlet, using the flexible tubing or a 3/8" O.D.copper pipe, to the cold water supply line withregular plumbing fitting and a shut-off valveinstalled in an accessible position between thewater supply line and the unit.
Water drainThe recommended drain tube is a plastic orflexible tube with 18 mm (3/4") I.D. which runs toan open trapped and vented drain. When thedrain is a long run, allow 3 cm pitch per meter(1/4" pitch per foot).A vent at the unit drain connection is also requiredfor proper sump drainage.
Water drain - Water cooled modelsConnect the 3/4" GAS male fitting of thecondenser water drain, utilizing a second flexibletubing or a 3/8" O.D. copper tubing, to the opentrapped and vented drain.
NOTE. The water supply and the water drainmust be installed to conform with the localcode. In some case a licensed plumber and/or a plumbing permit is required.
G. FINAL CHECK LIST
1. Is the unit in a room where ambienttemperatures are within a minimum of 10°C(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearancearound the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all the electrical and plumbingconnections been made, and is the water supplyshut-off valve open?
5. Has the voltage been tested and checkedagainst the data plate rating?
6. Has the water supply pressure beenchecked to ensure a water pressure of at least 1bar (14 psi).
7. Have the bolts holding the compressor downbeen checked to ensure that the compressor issnugly fitted onto the mounting pads?
8. Check all refrigerant lines and conduit linesto guard against vibrations and possible failure.
9. Have the bin liner and cabinet been wipedclean?
10. Has the owner/user been given the UserManual and been instructed on the importance ofperiodic maintenance checks?
11. Has the Manufacturer’s registration cardbeen filled in properly? Check for correct modeland serial number against the serial plate andmail the registration card to the factory.
Page 9Page 9
H. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" gas male fitting
5. Power line
6. Main switch
7/9. Drain fitting
8/10. Vented drain line
11. Open trapped vented drain
WARNING. This icemaker is not designed for outdoor installation and will not function inambient 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 10Page 10
OPERATING INSTRUCTIONS
NOTE. Ice maker pcb is equipped by jumpercleaning reminding setting (see pag. 20)suitable to alert users after certain time of unitoperation. This would advice for preventivemaintenance.This time can be adjusted for 6 or 12 monthsoperation (upon installer advice related toinstallation site water and ambient condition);once selected time is elapsed RED front panellamp blinks slowly and ice maker will keep onworking anyway.Pcb is also equipped by 3 (standard) or 60(machines operating at 400/50/3) minutesjumper setting start up delay (see pag. 20).In case of pcb setting to 60 minutes ice makerdoesn't start until this time is elapsed. Afterhaving correctly installed the ice maker andcompleted the plumbing and electricalconnections, perform the following “Start-up”procedure.
START UP
After having correctly installed the ice maker andcompleted the plumbing and electricalconnections, perform the following “Start-up” pro-cedure.
A. Give power to the unit to start it up byswitching "ON" the power line main disconnectswitch.
NOTE. Every time the unit returns underpower, after having been switched off, thewater inlet valve, the hot gas valve and thewater drain valve get energized for a periodof 5 minutes, thus to admit new water to themachine sump reservoir to fill it up and,eventually, to wash-off any dirt that can havedeposited in it during the unit off period(Fig.1).
B. During the water filling operation, check tosee that the incoming water dribbles, through theevaporator platen dribbler holes, down into thesump reservoir to fill it up and also that theincoming surplus of water flows out through theoverflow pipe into the drain line.During the water filling phase the componentsenergized are:
THE WATER INLET SOLENOID VALVETHE HOT GAS SOLENOID VALVETHE WATER DRAIN SOLENOID VALVE/Sfor the first 30 seconds.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 1
Page 11Page 11
NOTE. If in the 5 minutes length of the waterfilling phase the machine sump reservoirdoes not get filled with water up to the rim ofthe overflow pipe, it is advisable to check:1.The water pressure of the water supply linethat must be at least 1 bar (14 psig) Minimum(Max 5 bar-70 psig).2.The filtering device installed in the waterline that may reduce the water pressure belowthe Minimum value of 1 bar (14 psig).3. Any clogging situation in the water circuitlike the inlet water strainer and/or the flowcontrol.
C. At completion of the water filling phase (5minutes) the unit passes automatically into thefreezing cycle with the start up of:COMPRESSORWATER PUMPFAN MOTOR/S (in air cooled version) controlledby the condensing temperature sensor locatedwithin the condenser fins (Fig.2).
OPERATIONAL CHECKS
D. If necessary install the refrigerant servicegauges on both the high side and low sideSchräder valves to check the compressor headand suction pressures.
NOTE. On air cooled models the condensertemperature sensor, which is located withinthe condenser fins, keep the head(condensing) pressure between 16 and 18bars (225-250 psig).In the water cooled models the dischargepressure is kept constant at the value of 17bars (240 psig) by means of a water regulatingvalve located on the water supply line to thecondenser.In case of condenser clogging such to preventthe proper flow of the cooling air or, in casethe fan motor is out of operation or shortageof water in the water cooled condenser, thecondenser temperature rises and when itreaches 70°C (160°F) - for air cooled version- or 60°C (140°F) - for water cooled version -the condenser temperature sensor shuts-offthe ice maker with the consequent light-up ofthe RED WARNING LED (Fig.3).
After having diagnosed the reason of the riseof temperature and removed its cause, it isnecessary to unplug (wait few seconds) andplug in again the unit, thus to put the machinein condition to initiate a new freezing cycle.
The machine restarts with the usual 5 minuteswater filling phase in order to provide enoughwater into the sump tank.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 2
Page 12Page 12
E. Check to see through the ice dischargeopening that the self propeller spray bar iscorrectly rotating and that the water jets uniformelyreach the interior of the inverted mold cups andthere is not excessive water spilling through it.
F. The ice making process takes place thereby,with the water sprayed into the molds that getsgradually refrigerated by the heat exchange withthe refrigerant flowing into the evaporatorserpentine.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 4
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 3
Page 13Page 13
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 5
During the freezing process, when the evaporatortemperature falls below an established value, tothe evaporator temperature sensor supplies alow voltage power signal to the electronic controldevice (P.C.BOARD) in order to activate anelectronic timer.This one takes over the control of the freezingcycle up to the complete formation of the icecubes (Fig.4).
NOTE. The length of the entire freezing cycleis governed by the evaporator temperaturesensor which has its brobe placed in contactwith the evaporator serpentine (Nonadjustable) in combination with the electronictimer (Adjustable) incorporated in the P.C.BOARD).The timer adjustment is factory set inconsideration of the ice maker model, coolingversion and ice cube size (Small, Medium,Large).It is possible, however, to modify the timedlength of the freezing cycle, by changing theDIP SWITCH keys setting.In Table B of PRINCIPLE OF OPERATIONare shown the various time extensions of thefreezing cycle second phase, in relation withthe different DIP SWITCH keys settings.
G. After about 17-20 minutes from thebeginning of the freezing cycle, in an hypotheticambient temperature of 21°C , the defrost cycletakes place with the hot gas and the water inletvalves being simoultaneously activated (Fig.5).The electrical components in operation are:
COMPRESSOR
WATER PUMP
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/Sfor the first 30 seconds.
NOTE. The length of the defrost cycle isrelated to the length of the second phase offreezing cycle T2. (Time to drop theevaporating temperature from 0°C (32°F) -small Red LED blinking-to-15°C (5°F) smallRed LED ON steady.It is possible to extend the length of the defrostcycle by changing the setting of DIP SWITCH7 and 8 as shown on table at page 24.
H. Check, during the defrost cycle, that theincoming water flows correctly into sump reservoirin order to refill it and that the surplus overflowsthrough the overflow drain tube.
Page 14Page 14
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 6
I. Check the texture of ice cubes just released.They have to be in the right shape with a smalldepression of about 5-6 mm in their crown.If not, wait for the completion of the second cyclebefore performing any adjustment.If required, the length of the timed freezing cyclecan be modified by changing the DIP SWITCHkeys setting as illustrated in OPERATINGPRINCIPLE.If the ice cubes are shallow and cloudy, it ispossible that the ice maker runs short of waterduring the freezing cycle second phase or, thequality of the supplied water requires the use ofan appropriate water filter or conditioner.
J. To be sure of the correct operation of icelevel control device, place one hand between itssensing “eyes” to interrupt the light beam.The Bin Full YELLOW LED starts to blink, andafter 60 seconds, the unit stops with thesimultaneous glowing of the same LED to moni-tor the BIN FULL situation (Fig.6).
Take the hand out from the ice level controlsensors to allow the resumption of the lightbeam. The BIN FULL YELLOW LED blinks fastand after approximately 6 seconds the ice makerresume its operation with the immediate glowingof the FIRST YELLOW LED indicating UNIT INOPERATION and the extinguishing of the “BINFULL” YELLOW LED.
NOTE. The ICE LEVEL CONTROL(INFRARED SYSTEM) is independent of thetemperature however, the reliability of itsdetection can be affected by external lightradiations or by any sort of dirt and scalesediment which may deposit directly on thelight source and on the receiver.To preventany possible ice maker malfunction, due tonegative affection of the light detector, it isadvisable to locate the unit where it is notreached by any direct light beam or lightradiation, also it is recommended to keep thebin door constantly closed and to follow theinstructions for the periodical cleaning ofthe light sensor elements as detailed in theMAINTENANCE AND CLEANING PRO-CEDURES.At time of installation it's necessary to performthe calibration of the I/R Ice Level control.• Switch OFF the machine at Master Green
Push Button Switch• Push and hold the PC Board Push Button• Switch ON the machine at Master Green
Push Button Switch• Few seconds later the LEDs of the PC
Board starts to blink• Release the PC Board Push ButtonThe I/R Ice Level control is now calibrated.
K. Remove, if previously installed, therefrigerant service gauges and re-fit the unitservice panels previously removed.
L. Instruct the owner/user on the generaloperation of the ice machine and about thecleaning and care it requires.
Page 15Page 15
PRINCIPLE OF OPERATION
How it worksIn the SCOTSMAN Modular Cubers the waterused to make the ice is kept constantly incirculation by an electric water pump which primesit to the self propeller spray bar nozzles fromwhere it is diverted into the inverted mold cups ofthe evaporator (Fig. B).A small quantity of the sprayed water freezes intoice; the rest of it cascades by gravity into thesump assembly below for recirculation.
FREEZING CYCLE (Fig. A)
The hot gas refrigerant discharged out from thecompressor reaches the condenser where, beingcooled down, condenses into liquid. Flowing intothe liquid line it passes through the drier filter,then it goes all the way through the capillary tubewhere, due to the heat exchanging action, itlooses some of its heat content so that its pressureand temperature are lowered as well.Next the refrigerant enters into the evaporatorserpentine (which has a larger I.D. then thecapillary) and starts to boil off; this reaction isemphasized by the heat transferred by thesprayed water.The refrigerant then increases in volume andchanges entirely into vapor.The vapor refrigerant then passes through thesuction accumulator (used to prevent that anysmall amount of liquid refrigerant may reach thecompressor) and through the suction line. In boththe accumulator and the suction line it exchangesheat with the refrigerant flowing into the capillarytube (warmer), before to be sucked in thecompressor and to be recirculated as hotcompressed refrigerant gas.The freezing cycle is controlled by the evaporatortemperature sensor (which has its probe in contactwith the evaporator serpentine) that determinesthe length of its first portion of the cycle.
When the temperature of the evaporatorserpentine drops to a pre-set value, the evaporatorsensor probe changes its electrical resistanceallowing a low voltage current (12 volts) to flow tothe P.C. BOARD which in turn activates anelectronic timer.The timer, which is built-in the P.C. BOARD,takes over from the evaporator temperaturesensor, the control of the freezing cycle up to itscompletion.
NOTE. The change of the electric potential ofthe evaporator sensor with the consequentactivation of the timer (Time mode) is signalledby the glowing-up of the RED LED locatedbeside the FREEZING yellow one in the frontof the P.C. BOARD.
ATTENTION. In case, after 15 minutesfrom the beginning of the freezing cycle,the temperature of the evaporator sensorprobe is higher then 0 °C (32°F) (shortageof refrigerant, inoperative hot gas valve,etc.) the P.C. BOARD switch OFFimmediately the unit with thesimultaneous blinking of the WARNINGRED LED.
The length of this second portion of the freezingcycle is pre-fixed and related to the setting of thefirst four DIP SWITCH keys.The DIP SWITCH keys setting is made inconsideration of the type of condenser used.In Table B are indicated the various lengths of thesecond portion of freezing cycle (Time mode) inrelation to the different combinations of the DIPSWITCH KEYS.In Table A herebelow are illustrated the DIPSWITCH key combinations for the three differentfactory.
Page 16Page 16
Page 17Page 17
The electrical components in operation duringthe freezing cycle are:
COMPRESSOR
FAN MOTOR (in air cooled version)
WATER PUMP
CONTACTOR COILand during the second phase of freezing cycle(Time mode) they are joined by the
ELECTRONIC TIMER
The refrigerant head pressure, in the course ofthe freezing cycle, ranges between 18 and 16bars (250-225 psig) being controlled by the tem-perature sensor probe located within thecondenser fins (air cooled version) or, on thecondenser tube coil (water cooled version).On the air cooled version, the condenser tempe-rature sensor, when senses a rising of thecondenser temperature beyond the pre-fixedlimit, changes its electrical resistance and send alow voltage power flow to the Micro Processor ofP.C. BOARD which in turn energizes, through aTRIAC, the FAN MOTOR.When the opposite situation occures, i.e. thecondenser temperature gets below the pre-fixedlimit, the temperature sensor changes again itselectrical resistance reducing therefore the currentflow to the P.C. BOARD to cause the fan motortemporary cut-off.
NOTE. On this model the condenser sensorsare used just to switch off the unit in case thecondensing temperature rise up to more then70°C (for air cooled version) or more then62°C (for water cooled version) for one of thefollowing abnormal reasons:CLOGGED CONDENSER (Air cooledversion)FAN MOTOR OUT OF OPERATION (Aircooled version)INSUFFICIENT FLOW OF COOLINGWATER (Water cooled version)AMBIENT TEMPERATURE HIGHER THEN40°C (100°F)it causes the total and immediate SHUT-OFFof the machine in order to prevent the unitfrom operating in abnormal and dangerousconditions.When the ice maker stops on account of thisprotective device, there is a simultaneousglowing of the RED LED, warning the user ofthe Hi Temperature situation.After having efiminated the source of thecondenser hi-temperature, to restart themachine just switching OFF and ON the unitat main line switch.The ice machine resumes its normal operationby going through the 5 minutes water fillingphase.
At the start of the freezing cycle the refrigerantsuction or lo-pressure lowers rapidly to 2.5 bars-35 psig then it declines gradually - in relation withthe growing of the ice thickness - to reach, at theend of the cycle, approx. 1.6 ÷ 1.7 bar - 22 ÷ 24psig with the cubes fully formed in the cup molds.The total length of the freezing cycle ranges f rom20 to 25 minutes.
DEFROST OR HARVEST CYCLE (Fig. D)
As the electronic timer has carried the systemthroughout the second phase of freezing cycle,the defrost cycle starts.
ATTENTION. In case the unit be able toreach 0 °C (32°F) evaporating temperatu-re within 15 minutes, but after 45 minutesfrom the beginning of the freezing cycle ithas not yet reached the evaporator tem-perature of -15 °C (5°F) the machine goesstraight into the defrost cycle omittingthe timed portion of the freezing cyclerelied to the setting of the first four DIPSWITCHES.
NOTE. The length of the defrost cycle isrelated to the length of the second phase offreezing cycle T2. (Time to drop theevaporating temperature from 0°C (32°F) -small Red LED blinking-to-15°C (5°F) smallRed LED ON steady.It is possible to extend the length of the defrostcycle by changing the setting of DIP SWITCH7 and 8 as shown on table at page 24.
The electrical components in operation duringthis phase are:
COMPRESSORCONTACTOR COILWATER INLET VALVEHOT GAS VALVEWATER DRAIN VALVEand theWATER PUMPon the first 30 seconds.
The incoming water, passing through the waterinlet valve and the flow control, runs over theevaporator platen and then flows by gravitythrough the dribbler holes down into the sump/reservoir (Fig. D).The water filling the sump/reservoir forces part ofthe surplus water from the previous freezingcycle to go out to the waste through the overflowpipe. This overflow limits the level of the sumpwater which will be used to produce the nextbatch of ice cubes.
Page 18Page 18
Meanwhile, the refrigerant as hot gas, dischargedfrom the compressor, flows through the hot gasvalve directly into the evaporator serpentine by-passing the condenser.The hot gas circulating into the serpentine of theevaporator warms up the copper molds causingthe defrost of the ice cubes. The ice cubes,released from the cups, drop by gravity onto aslanted cube chute, then through a curtainedopening they fall into the storage bin.At the end of the defrost cycle, both the hot gasand the water inlet valves close and the machinestarts again a new freezing cycle.
OPERATION - CONTROL SEQUENCE
At the start of freezing cycle, the evaporatortemperature sensor controls the length of thefirst part of the freezing cycle. As it reaches apredetermined temperature, it supplies a lowvoltage current to the P.C. BOARD in order toactivate the electronic timer which, takes overthe control of the freezing cycle for a pre-fixedtime, according to the DIP SWITCH keys setting(see Tab. B).
NOTE. The evaporator temperature sensor,factory pre-set, is the same for all the modelsand is not adjustable.
Once completed the freezing cycle 2nd phasethe system goes automatically into the defrostcycle which also has a pre-fixed length. Atcompletion of the defrost cycle the P.C. BOARDcommands the unit to start again a new freezingcycle.
OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switchesand which components are ON or OFF during apartÌcular phase of the icemaking cycle.
BEGINNIING FREEZE
Electrical components (Loads) . ON OFFCompressor .................................. •Fan Motor (Air cooled only) and TRIAC •Hot Gas Valve .............................. •Inlet Water Valve .......................... •P.C. Board Relay 1 Coil ............... •P.C. Board Relay 2 & 3 Coil ......... •Water Pump ................................. •Contactor Coil .............................. •Electronic Timer ........................... •
Electronic Controls & Sensors .. ON OFFEvaporator Sensor ....................... •Condenser Sensor ....................... •Ice Level Control .......................... •
TIMED FREEZE
Electrical components (Loads) . ON OFFCompressor .................................. •Fan Motor (Air cooled only) and TRIAC • •Hot Gas Valve .............................. •Inlet Water Valve .......................... •P.C. Board Relay 1 Coil ............... •P.C. Board Relay 2 & 3 Coil ......... •Water Pump ................................. •Contactor Coil .............................. •Electronic Timer ........................... •
Electronic Controls & Sensors . ON OFFEvaporator Sensor ....................... •Condenser Sensor ....................... • •Ice Level Control .......................... •
HARVEST (Drain portion - first 30 sec.)
Electrical components (Loads) . ON OFFCompressor .................................. •Fan Motor (Air cooled only) and TRIAC . •Hot Gas Valve .............................. •Water Inlet Valve .......................... •Water Drain Valve ........................ •P.C. Board Relay 1 & 2 Coil ......... •P.C. Board Relay 3 Coil ............... •Water Pump ................................. •Contactor Coil .............................. •P.C.B. Timer................................. •
HARVEST (Water filling portion)
Electrical components (Loads) . ON OFFCompressor .................................. •Fan Motor (Air cooled only) and TRIAC . •Hot Gas Valve .............................. •Water Inlet Valve .......................... •Water Drain Valve ........................ •P.C. Board Relay 1 & 2 Coil ......... •P.C. Board Relay 3 Coil ............... •Water Pump ................................. •Contactor Coil .............................. •P.C. Board Timer ......................... •
Electronic Controls & Sensors . ON OFFEvaporator Sensor ....................... •Condenser Sensor ....................... •Ice Level Control .......................... •
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Freeze Cycle
Average DischargePressure A/C: 16÷18 bars (225÷250 psig)
Average DischargePressure W/C: 17 bars (240 psig)
Suction Pressure EndFreeze Cycle: 1.6÷1.7 bar (22÷24 psig)
REFRIGERANT CHARGE (R 404 A)
Air Cooled Water Cooled
MC 46 1300 gr 700 gr
MC 46 (60 Hz) 1040 gr 560 gr
NOTE. Before charging the refrigerant systemalways check the type of refrigerant andquantity as specified on the individual icemachine dataplate.The refrigerant charges indicated are relatedto average operating conditions.
WARNING. As R 404 a is a band of differenttypes of refrigerants it is imperative tocharge the system only in liquid phase inorder to avoid to alter their mix-uppercentage.
COMPONENTS DESCRIPTION
A. EVAPORATOR TEMPERATURESENSOR
The evaporator temperature sensor probe,located in contact with the evaporator serpentine,detects the dropping of the evaporator tempera-ture during the freezing cycle and signals it bysupplying a current flow to the micro processor ofP.C. BOARD.According to the current received, the evaporatorsensor supplies power to the P.C. BOARD first,when it reachs 0°C (32°F), second at -15°C (5°F);in this second case it supply power to the electronictimer built into the P.C. BOARD so that it maytake control of the fength of the 2nd phase offreezing cycle.The length of the timed phase is pre-f ixed by thesetting of the keys 1, 2, 3 and 4 of the DIPSWITCH.
The activation of the electronic timer (-15°C -5°F) is monitored by the lighting up of the REDLED placed in the front of the P.C. BOARD.This lighting up occures usually in the mid periodof the freezing cycle and signals the switchingfrom the first to the second phase of the freezingcycle.
NOTE. Whenever, after 15 minutes from thebeginning of the freezing cycle, theevaporating temperature have not yetreached the value of 0°C (32°F), the P.C.BOARD switches OFF the machine with theBLINKING of RED LED.
B. CONDENSER TEMPERATURE SENSOR
The condenser temperature sensor probe,located within the condenser fins (air cooledversion) or in contact with the tube coil (watercooled version) detects the condenser tempera-ture variations and signals them by supplyingcurrent, at low voltage, to the P.C. BOARD.In the air cooled versions, in relation to thedifferent current received, the micro processor ofthe P.C. BOARD supplies, through a TRIAC, thepower at high voltage to the fan motor so to coolthe condenser and to reduce its temperature.In case the condenser temperature rises andreaches 70°C (1 60°F) - on air cooled models - or62°C (145°F) - on water cooled models - thecurrent arriving to the micro processor is such tocause an immediate and total stop of the machineoperation.
C. ICE BIN LEVEL LIGHT CONTROL
The electronic ice bin level control, locatedinto the storage bin, has the function to stopthe operation of the ice machine ONLY ATTHE END OF THE HARVEST CYCLE whenthe light beam between the light source andthe sensor is interrupted by the ice cubesstored into the bin.When the light beam is interrupted the Bin FullYELLOW LED starts blinking.
SETTING OF THE ICE LEVELCONTROL SENSIVITY
In case of any need it's possible to up to date thesensivity of the optical ice level control as perhere below procedure:
a) Switch OFF the machine at Power Main Switchb)Push and hold the PC Board Push Buttonc) Switch ON the machine at Power Main Switchd) Keep pushed the PC Board Push Button
till the Leds of the PC Board are ONe) Release the PC Board Push Button.
NOTE. The setting of the Ice Level ControlSensivity must be done any time a new PCBoard or a new lce Level Control is installedin the machine.
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D. P.C. BOARD (Data processor)
The P.C. BOARD , fitted in its plastic box locatedin the front of the unit, consists of two separatedprinted circuits one at high and the other at lowvoltage integrated with two fuses one on power in(32mA) and one on power out (6.3 A), of fouraligned LEDS monitoring the operation of themachine, of one extra monitoring RED LED (blink0°C - steady - 15°C), of one DIP SWITCH with tenkeys, of one push button, of input terminals for the
leads of the sensor probes and input and outputterminals for the leads of the ice maker electricalwires.The P.C. BOARD is the brain of the system andit elaborates, through its micro processor, thesignals received from the three sensors in orderto control the operation of the different electricalcomponents of the ice maker (compressor, waterpump, solenoid valves, etc.).
At restart, from any tripping OFF at Bin Full, thenew PC Board assures 45 seconds water fillingphase so to refill the water sump up to the maximumlevel.
In case of malfunction of the Optical Ice LevelControl, thenew PC Board switch ON alternativeltthe Yellow and Red Led continuously.
On the PC Board there are four jumpers to select:• 6 or 12 months remind time for the water system
cleaning• Operation of the Purge Out Water Pump (Jump
IN on EC series)• 3 or 60 minutes delay time at first start up
(3 minutes in all new AC Series)• TEST
In case the TEST contacts are closed with theJumper, at the Start Up of the machine the PCBoard energizes all the electrical components formaximum 3 minutes time.
At the end of the 3 minutes the PC Board switchOFF the entire machine with the blinking of allthe LED's as shown on the bottom drawing.
6-12MONTHS
EC SERIES 0 OR 60 MINUTESDELAY
TEST
ON STEADY
BLINKING
Page 21Page 21
E. PUSH BUTTON OPERATION
DURING WATER FILLING PHASE• Push for more then 2” but less then 5” themachine enters in Cleaning Mode• Push for more then 5” the machine by-passthe Water Filling Phase
DURING FREEZING/HARVEST CYCLE• Push for more then 5” during the Freezingcycle the machine goes immediately into Harvest• Push for more then 5” during the Harvest cyclethe machine enters immediately in the Freezingcycle
The length of Harvest is equal to:• 35” if Push Button is activated before -15°Cevaporating temperature LED activation
• As per Harvest cycle chart, if Push Buttonis activated after -15°C evaporatingtemperature LED activation (Red LED insidePC Board ON steady)
F. LED MEANING
GREEN LED ONUnit under power
YELLOW BIN FULL LED ONUnit shut-OFF at storage bin fullYELLOW BIN FULL LED BLINKINGInfrared beam break out
RED ALARM LED ONToo hi condensing temperatureRED ALARM LED BLINKINGToo hi evaporating temperature
YELLOW FREEZING CYCLE ONUnit in freezing cycle mode
YELLOW FREEZING LED AND RED ALARMLED ONCondenser sensor out of orderYELLOW FREEZING LED AND RED ALARMLED BLINKINGEvaporator sensor out of order
FREEZING CYCLE
BIN FULL
POWER
TOO HI EVAP TEMP
TOO HI COND TEMP
PUSHBUTTON
PUSHBUTTON
LED STATUS REASON WHY
ON STEADY UNIT UNDER POWER
ON STEADY FREEZING CYCLE
BLINKING60 MINUTES DELAY AT START UPJUMPER J3 OUT
ON STEADYTOO HI DISCHARGEPRESSURE/TEMP
BLINKINGTOO HI EVAP. TEMP. (> 0C°)AFTER 15’ FROM START UP
ON STEADY UNIT OFF AT BIN FULL
BLINKINGSLOW I/R BEAM CUTTED
I/R ON AFTER TRIP OFF ATBIN FULL
BLINKINGFAST
ON STEADY I/R CALIBRATION DONE
BLINKINGUNIT IN CLEANING MODE OR TRIPPINGOFF AFTER TEST - JUMPER TEST IN
ON STEADYCONDENSER SENSOR OUTOF ORDER
BLINKINGEVAPORATOR SENSOR OUTOF ORDER
BLINKINGALTERNATIVELY I/R SENSOR OUT OF ORDER
PUSH
PUSH > 5” DURING WATER FILLING TOMOVE THE UNIT INTO FREEZING
PUSH > 5” DURING FREEZINGTO MOVE THE UNIT INTO DEFROST
PUSH > 5” DURING DEFROSTTO MOVE THE UNIT INTO FREEZING
PUSH 2” > 5” DURING WATER FILLINGTO MOVE THE UNIT INTO CLEANINGPUSH DURING THE 60 MIN START UP
DELAY TIME TO BY-PASS IT
G. DIP SWITCH
The P.C.BOARD which controls the entireoperation of the ice maker, has a DIP SWITCHwith ten switching keys which allow to set upthe micro processor program in order to extendor to shorten the length of freezing cycle in relationto the different model and versions of ice machines.
The DIP SWITCH first four keys settingdetermines the length of the 2nd phase offreezing cycle (controlled by the electronictimer) as detailed in the table B.
The DIP SWITCH keys 5 & 6 setting determinesthe length of the defrost cycle according to the
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H. WATER SPRAY SYSTEMThrough its nozzles, the water pumped, is sprayedin each individual cup to be frozen into ice.It consists of one spray tube wheve are locatedseveral spray nozzles.
I. WATER PUMPThe water pump operates continually throughoutthe freezing cycle and on the first 15 or 30seconds of the defrost cycle so to such theremaining water from the sump tank (reach inmineral salts) and drain it out.During the freezing cycle the pump primes thewater from the sump to the spray system andthrough the spray nozzles sprays it into theinverted cup molds to be frozen into crystal clearice cubes.It is recommended that the pump motor bearingsbe checked at least every six months.
J. WATER INLET SOLENOID VALVE -3/4 GAS MALE FITTING
The water inlet solenoid valve is activated by themicro processor of the P.C. BOARD during thefirst 5 minutes of water filling phase and as wellduring the defrost cycle.When energized it allows a metered amount ofincoming water to flow overt he evaporator cavityto assist the hot gas in defrosting the ice cubes.The water running over the evaporator cavitydrops by gravity, through the dribbler holes ofthe platen, into the sump reservoir where it will besucked by the water pump and primed to thespray system.
K. HOT GAS SOLENOID VALVE
The hot gas solenoid valve consists basically intwo parts: the valve body and the valve coil.Located on the hot gas line, this valve is energizedthrough the micro processor of P.C. BOARDduring the defrost cycle and as well during thewater filling phase.
LENGTH OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO THEDIP SWITCH SETTING COMBINATIONS
TAB. B
size of the cubes (Large or Medium) as per thefollowing setting:ON ON : PROGRAM AON OFF : PROGRAM BOFF OFF : PROGRAM COFF ON : PROGRAM D
LENGTH OF HARVEST CYCLEACCORDING TO THE TIME TO DROP THE
EVAP. TEMPERATURE FROM 0°C TO -15°C
LENGTH PROGRAMSHARVEST
CYCLE A B C D180” Up to 6’30” *** Up to 9’30” xxxx165” 6’30”-7’ Up to 3’ 9’30”-10’ xxxx150” 7’-8’ 3’-3’15’ 10’-11’ xxxx135” 8’-9’ 3’15”-3’30” 11’-12’ xxxx120” 9’-10’30” 3’30”-4’30” 12’-13’30” < 3'105” 10’30”-12’ 4’30”-6’ 13’30”-15’ 3' - 4'90” >12’ >6’ >15’ > 4'
The DIP SWITCH N° 7 and 8 allow the extentionof the length of the harvest/defrost cycle accordingto their combination as per following chart:
DIP SWITCH ADDITIONAL DEFROST TIME
7 8
ON ON 0
OFF ON 30"
ON OFF 60"
OFF OFF WATER PUMP OFF
The 9th key is used to supply power to the waterpump for the first 15 seconds of the defrost cycle- position OFF - or for the first 30 seconds -position ON .
The 10th key is used to modify the CUT-OUTcondensing temperature from 70 °C (160°F) forthe air cooled versions - ON position - to 60°C(140°F) - OFF position - for the water cooledversions.
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During the defrost cycle the hot gas valve coil isactivated so to attract the hot gas valve piston inorder to give way to the hot gas discharged fromthe compressor to flow directly into the evaporatorserpentine to defrost the formed ice cubes.
L. FAN MOTOR (Alir cooled version)
The fan motor is controlled through the P.C.BOARD and the TRIAC by the condenser tempe-rature sensor. Normally it operates only duringthe freezing cycle to draw cooling air through thecondenser fins.In the second part of the freezing cycle, the fanmotor can run at intermittance as the condenserpressure must be kept between twocorresponding head pressure values (16÷18 bars-225÷250 psig).
M. COMPRESSOR
The hermetic compressor is the heart of therefrigerant system and it is used to circulate andretrieve the refrigerant throughout the entiresystem.It compresses the low pressure refrigerant vaporcausing its temperature to rise and become highpressure hot vapor which is then released throughthe discharge valve.
N. WATER REGULATING VALVE(Water cooled version)
This valve controls the head pressure in therefrigerant system by regulating the flow of watergoing to the condenser.As pressure increases, the water regulating val-ve opens to increase the flow of cooling water.
O. CONTACTOR
Placed outside of the control box it is controlledby the P.C. BOARD in order to close or open theelectrical circuit to the compressor.
P. WATER DRAIN SOLENOID VALVEThe water drain solenoid valve, electricallyconnected in parallel to the water inlet and to thehot gas solenoid valves, is energized for all thelength of the defrost cycle.By means of the water pump, that remainsenergized for 30 seconds at the beginning of thedefrost cycle, it allows the drain out of all remainingwater (rich of minerals deposited during theprevious freezing cycle) from the sump tank.By doing so it allows to the ice maker to makeevery new freezing cycle with new fresh water,avoiding thereby the accumulation of sedimentsand scales, which soon or later will cause thepartial or total clogging of the water system on theunit.
Q. CURRENT RELAY(3 PHASE VERSION ONLY)
Connected in series to the 3 phase compressortrips off the compressor contactor when thecurrent of one of the three phases is more then:
Voltage Current
230/50/3 8 Amps
230/60/3 9 Amps
400/50/3 6 Amps
Page 24Page 24
ADJUSTMENT, REMOVAL AND REPLACEMENTPROCEDURES
SMALLIDENTATION
LITTLE OR NOICE IN CENTEROF CUBES
THICK BULGESOLID ICE
OVER SIZE
NORMAL SIZE-SHAPE
SHALLOW SIZE
A. ADJUSTMENT OF THE CUBE SIZE
CAUTION. Before performing actualadjustment of the cube size, check otherpossible causes for cube size problems,refer to the Service Diagnosis Section forproblem review and analysis.Do not perform any adjustment till theicemaking system has progressedthrough severaÏ complete freezing andharvest cycle, to observe size and qualityof ice cubes and whether or not the cubesize problem exists.
I. lf the cubes are shallow size (Indentation istoo deep) probably the length of the secondphase of the freezing cycle is too short so, toextend such length you have to:
1. Locate the DIP SWITCH on the front of theP.C. Board.
2. Take note of thecombination of the first fourDIP SWITCH KEYS and check the corrispondinglength of freezing cycle 2nd phase on Table B.
3. Change the same DIP SWITCH KEYSsetting so that it will correspond to the combinationon table B pre-ceding the one remarked atstep 2.This will allow an extension of the freezing cycleof two more minutes.
4. Observe the ice cubes in the next twoharvests and eventually repeat steps 2 and 3above until proper ice cubes size is achieved.See figure.
II. lf the cubes are oversize size (Indentation istoo full) probably the length of the second phaseof the freezing cycle is too long.To shorten such length you have to:
1 . Locate the DIP SWITCH on the front of theP.C. Board.
2. Take note of the combination of the first fourDIP SWITCH KEYS and check the corrispondinglength of freezing cycle 2nd phase on Table B.
3. Change the same DIP SWITCH KEYSsetting so that it will correspond to the combinationon table B coming next to the one remarked atstep 2.This will reduce an the freezing cycle length oftwo minutes.
4. Observe the ice cubes in the next twoharvests and eventually repeat steps 2 and 3above until proper ice cubes size is achieved.See figure.
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WIRING DIAGRAM
MC-46 A-W 230/50/1
Page 26Page 26
WIRING DIAGRAM
MC-46 A-W 230/60/1
Page 27Page 27
WIRING DIAGRAM
MC-46 A-W220/50-60/3 - 400/50/3 + N
Page 28Page 28
SERVICE DIAGNOSIS
SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION
Unit will not run Blown power in fuse in P.C.Board Replace fuse & check for cause of(No warning LEDS glows) blown fuse
Main switch in OFF position Turn switch to ON position
Inoperative P.C.Board Replace P.C.Board
Loose electrical connections Check wiring
(Green LED-Power ON glows) Blown power out fuse in P.C. Board Replace fuse & check for cause ofblown fuse
(Bin full LED glows) Inoperative ice level control Clean or replace ice level control
Inoperative P.C.Board Replace P.C.Board
(Red-alarm LED glows) High head pressure Dirty condenser. CleanInoperative fan motor. ReplaceShortage of water (WC)
(Red-alarm LED blinks) High evaporating temperature Hot gas valve leak - Replace it.after 15 mins. beginning freeze Water inlet valve leak - Replace it.
Short of refrigerant.Compressor cycles intermittently
(Freezing or Bin Full LED + Condenser sensor out of order Replace itRed-alarm LED glow)
(Freezing or Bin Full LED + Evaporator sensor out of order Replace itRed-alarm LED blink)
(Freezing or Bin Full LED + Ice Level Control out of order Replace itRed-alarm LED blink alternatively)
Compressor cycles intermittently Low voltage Check circuit for overloadingCheck voltage at the supply to thebuilding. If low, contact the power company
Contactor with burnt contacts Replace it
Non-condensable gas in system Purge the system
Compressor starting device with Check for loose wires in startingloose wires device
Mechanical problem Replace compressor
Cubes too small Freezing cycle too short Review setting of DIP SWITCH keys
Capillary tube partially restricted Blow charge, add new gas & drier, afterevacuating systemwithvacuum pump
Moisture in the system Same as above
Shortage of refrigerant Check for leaks & recharge
Cloudy cubes Shortage of water See remedies for shortage of water
Dirty water supply Use water softner or water filter
Accumulated impurities Use SCOTSMAN Ice Machine cleaner
Shortage of water Water spilling out through curtain Check or replace curtain
Water solenoid valve not opening Replace valve
Water leak in sump area Locate and repair
Water flow control plugged Replace water inlet valve
Leak of water drain valve Replace valve
Page 29Page 29
SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Irregular cubes size & some Some jets plugged Remove spray bar & jet bearingcloudy and clean them
Shortage of water See shortage of water
Unit not level Level as required
Spray bar not rotating Remove spray bar & jet bearingand clean them
Cubes too large Freezing cycle too long Review setting of DIP SWITCH keys
Inoperative evaporator sensor Replace sensor
Decreased ice capacity Inefficient compressor Replace
Leaky water valve Repair or replace
Non-condensable gas in system Purge the system
Poor air circulation or excessive Relocate the unit or provide forhot location (Red-alarm LED glows) more ventilation
Overcharge of refrigerant Correct the charge. Purge off slowly
Capillary tube partially restricted Blow charge, add new gas & drier,after evacuating system withvacuum pump
Hot gas solenoid valve leaking Replace valve
Short of refrigerant Charge to data plate indication
Discharge head pressure too high See incorrect discharge pressure
Poor harvest Restriction in incoming water line Check water valve strainer and flowcontrol. If necessary enlarge theflow control orifice
Water inlet valve not opening Valve coil with open windingReplace valve
Hot gas valve orifice restricted Replace hot gas valve assy
Clogged air vented holes in mold cups Clean out holes plugged
Discharge head pressure too low See incorrect discharge pressure
Unit won’t harvest Inoperative P.C.Board Replace P.C.Board
Hot gas valve not opening Valve coil with open windingReplace valve
Water solenoid valve not opening Valve coil with open windingReplace valve
Incorrect discharge pressure Inoperative condenser sensor Replace sensor
Inoperative P.C.Board Replace P.C.Board
Water regulating valve misadjusted Adjust its setting stem
Excessive water in unit base Water tubing leaking Check. Tighten or replace
SERVICE DIAGNOSIS
Page 30Page 30
MAINTENANCE AND CLEANING INSTRUCTIONS
A. GENERAL
The periods and the procedures for maintenanceand cleaning are given as guides and are not tobe construed as absolute or invariable.Cleaning, especially, will vary depending uponlocal water and ambient conditions and the icevolume produced; and, each icemaker must bemaintened individually, in accordance with itsparticular location requirements.
B. ICEMAKER
The following maintenance should be scheduledat least two times per year on these icemakers.
1 . Check and clean the water line strainer.
2. Check that the icemaker is levelled in sideto side and in front to rear directions.
3. Clean the water system, evaporators, binand spray bar/s using a solution of SCOTSMANIce Machine Cleaner.Refer to procedure C cleaning instructions andafter cleaning will indicate frequency and proce-dure to be followed in local areas.
4. Reach the water spray bar from the inside ofthe freezing chamber lifting it from its seat with itsbottom race washer.
Dip it into a tray filled with cleaning solution thenrinse it under a tap water stream.
With a pick clean the orifice of the water streamjet that propells the spray bar.
NOTE. Cleaning requirements vary accordingto the local water conditions and individualuser operation. Continuous check of the clarityof ice cubes and visual inspection of thewater spraying parts before and after cleaningwill indicate frequency and procedure to befollowed in local areas.
5. With the ice machine and fan motor OFF onair cooled models, clean condenser using vacuumcleaner, whisk broom or non metallic brush takingcare to do not damage both the condenser andambient temperature sensor probes.
6. Check for water leaks and tighten drain lineconnections. Pour water down through thestorage bin drain line to be sure that drain line isopen and clear.
7. Check size, condition and texture of icecubes. Perform adjustment of DIP SWITCH keysas required.
8. Check the ice level control sensor to testshut-off. Put some ice cubes between the lightsource and the receiver so to cut off the lightbeam for at least one minutes.This should cause the ice maker to shut off andthe light-up of the 2nd LED (yellow light).
IMPORTANT. Perform the above check onlyat the end of harvest cycle or at the beginningof freezing cycle in order to do not cause tothe unit to make a double freezing cycle.
NOTE. Within few seconds after the removalof the ice cubes from the Infrared sensinglight the icemaker restarts in freezing cycle.The ice level control uses devices that senselight, therefore they must be kept cleanenough so they can "see".Every month clean/wipe the sensing "eyes"with a clean soft cloth.
9. Check for refrigerant leaks.
Page 31Page 31
C. CLEANING INSTRUCTIONS OFWATER SYSTEM
1. Remove left, center and right front panels togain access either to the control box and to theevaporator.
2. Wait till the end of defrost cycle then turn theunit OFF by the main switch (disconnect powersupply).
3. Prepare for each freezing chamber thecleaning solution by diluting in a plastic containertwo or three liters of warm water (45°-50°C) witha 0,2-0,3 liters of SCOTSMAN Ice MachineCleaner.
WARNING. The SCOTSMAN Ice MachineCleaner contains Phosphoric andHydroxyacetic acids. These compoundsare corrosive and may cause burns ifswallowed, DO NOT induce vomiting.Give large amounts of water or milk. CallPhysician immediatelly. In case ofexternal contact flush with water. KEEPOUT OF THE REACH OF CHILDREN
4. Scoop out all the ice cubes stored into thebin in order to prevent them from beingcontaminated with the cleaning solution thenflush out the water from the sump reservoir bybending down the vertical sump drain hose.
5. Remove the evaporator cover then slowlypour onto the evaporator piaten the cleaningsolution- With the help of a brush dissolve themost resistant and remote scale deposits in theplaten.Perform the same for all the four evaporators.
6. Give power to the unit by the main switch.
7. During the Water Filling Phase push RESETBUTTON for more then 2” but less then 5” themachine enter in Cleaning Mode (Fig.7)
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 7
Page 32Page 32
FIG. 8
8. With the system in Cleaning mode thewater pump is the only component in operationto circulate the cleaning solution in the entirewater system
9. Let the unit remain in the cleaning mode forabout 20 minutes then turn the main switch toOFF (disconnect unit from POWER)
10. Flush out the cleaning solution from thesump reservoirs then pour onto each evaporatorcavity two or three liters of clean potable waterwith a capfull of antibacteria solution to rinse andsanitize the mold cups and the platen.If necessary remove the water spry bar to cleanit separately as per steps 3 and 4 of paragraph B.
11. Give power to the unit by the main switch
12. During the Water Filling Phase push RESETBUTTON for more then 2” but less then 5” themachine enter in Rinsing Mode (Fig.7)
13. Let the unit remain in the RINSING MODEmode for about 10 minutes then turn the mainswitch to OFF (disconnect unit from POWER)
14. Flush out the rinsing solution from the sumpreservoirs
15. Place again the evaporator cover and theunit service panels.
16. Give POWER to the unit.
17. At completion of the freezing and harvestcycle make sure of proper texture and clearnessof the ice cubes and that, they do not have anyacid taste.
ATTENTION. in case the ice cubes arecloudy, white and have an acid taste, meltthem immediatelly by pouring on themsome warm water. This to prevent thatsomebody could use them.
18. Wipe clean and rinse the inner surfaces ofthe storage bin.
REMEMBER. To prevent the accumulationof undesirable bacteria it is necessary tosanitize the interior of the storage bin with ananti-algae disinfectant solution every week.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
Rx Tx
WATER IN VALVE
HOT GAS VALVE
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEM
PERA
TURE
SEN
SORS
BIN
COM
PRES
SOR TRANSF.
DATA
PROC
ESSO
R
ELECTR.TIMER
DIPSWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
CONTACTOR COIL
12
FIG. 8
Page 33Page 33
Sanitation
NOTE. Sanitation of the water system isrecommended to be done once a month.
19. Prepare in a plastic container the sanitationsolution as per manufacturer dilution using warmwater (45-50 °C).
NOTE. Never mix the cleaning with thesanitising solution.
20. Follow the procedures as per cleaning (fromitem 10 to item 13) just shorting the operation ofthe water pump to 10 minutes.
21. Place again the evaporator cover and theunit service panels.
22. At completion of the freezing and harvestcycle make sure of proper texture and clearnessof the ice cubes and that, they do not have anyacid taste.
ATTENTION. In case the ice cubes arecloudy-white and have an acid taste, meltthem immediately by pouring on themsome warm water. This to prevent thatsomebody could use them.
23. Wipe clean and rinse the inner surfaces ofthe storage bin.
REMEMBER. To prevent the accumulationof undesirable bacteria it is necessary tosanitize every week the interior of the storagebin.
