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1. E 2 Dimensions HEIGHT without legs 795 mm HEIGHT with legs 915mm WIDTH 530 mm DEPTH 600 mm LL WEIGHT Kgs AC 86 CUBER machine specifications Model Cond unit Finish Comp HP PRIN Eon AC 86 AS 6 Air 143 AC 86 WS 6 Water Stainless steel 3 8 19 Kg 500 Start Electric power cons Basic electr Amps Amps Watts Kwh per 24 Hr Nr of wires Amps fuse 8 9 230 50 1 3 3 18 480 8 4 3x1 5 mm 10 Cubes per harvest 24 medium A 15 C water temperature Page 9 GENERAL INFORMATION AND INSTALLATION A INTRODUCTION This manual provides the specifications and the step by step procedures for the installation start up and operation maintenance and cleaning for the SCOTSMAN AC series icemakers These Cubers are quality designed engineered and manufactured Their ice making systems are thoroughly tested providing the utmost in flexibility to fit the needs of a particular user These i
2. 21 21 20 20 38 19 ICE PRODUCED PER 24 HRS AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS AMBIENT TEMPERATURE 32 27 21 15 10 C 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE With the unit in built in conditions the ice production is gradually reduced in respect to the levels shown in the graf up to a maximum of 10 at room temperatures higher than 32 C The daily ice making capacily is directly related to the condenser air inlet temperature water temperature conditions of the condenser air filter and age of the machine To keep your SCOTSMAN CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on Maintenance and Cleaning section of this manual Page 4 643 25 5 16 ADJUSTABLE FEET SPECIFICATIONS TOM LI 70 2 49 64 39 19 16 CORD SET 87 3 13 32 6 20 mm 152 600 5 63 64 23 39 64 _ EMA Jz 4o Oo 4 W Z 4z o jo 4 gt tc Z2 ak zy 28 29 i Lj LJ gu 46 5 49 64 25 32 OD OVERFLOW DRAIN 3 4 GAS WATER INLET WATER COOLED UNIT ONLY 206 8 1 8 3 4 GAS WATER INLET 386 15 13 64 es Dimensions HEIGHT 645 mm WIDTH 386 mm DEPTH 600
3. ADJUSTMENT PROCEDURES A ADJUSTMENT OF THE CUBE SIZE CONTROL CAUTION Before performing actual adjustment of the cube size control check other possible causes for cube size problems refer to section IV service diagnosis for problem review and analysis Adjustment of the cube size control is performed A f ice cubes are shallow size Indentation is too deep 1 Locate the cube size control knob in the front of control box 2 Rotate the adjusting knob one eighth of a turn clockwise 3 Observe size of ice cubes in next two ice cube harvest and repeat step 2 above in one eighth turn increments until proper ice cube size is achieved B f ice cubes are oversize Indentation is too full or they are not released 1 Locate the cube size control knob in the front of control box 2 Rotate the adjusting knob one eighth of a turn counterclockwise 3 Observe size of ice cubes in next two ice cube harvest and repeat step 2 above in one eighth turn increments until proper ice cube size is achieved Once the contro knob is set to obtain the ice cubes in the proper shape the ice maker does not require any more immediate attention 2 ADJUSTMENT OF THE BIN LEVEL CONTROL Adjustment of the bin level control is normally performed to cause more ice to be produced to result in a higher ice level in the bin or to cause less ice to be produced to result in a response to a too cold or too much ice condit
4. SCOTSMAN SERVICE MANUAL AC 46 AC 56 AC 86 Cubers with storage INDICE Page 2 Table of contents page 2 Specifications AC 46 3 Specifications AC 56 5 Specifications AC 86 7 GENERAL INFORMATION AND INSTALLATION Introduction 9 Unpacking and Inspection 9 Location and levelling 9 Electrical connections 9 Water supply and drain connections 10 Final check list 10 Installation practice 11 OPERATING INSTRUCTIONS Start up 42 Operational checks 12 OPERATING PRINCIPLES How it works Freezing cycle 13 Harvest cycle 13 Electrical sequence 15 Components description 15 ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES Adjustment of the cube size 18 Wiring diagram 19 Service diagnosis 20 MAINTENANCE AND CLEANING INSTRUCTIONS General 22 Icemaker 22 Clean Replace of air condenser filter 22 Cleaning instructions of water system 22 Page 3 SPECIFICATIONS ELECTRONIC CUBER MODEL AC 46 gt S 3 S Important operating requirements MIN MAX Air temperature 10 C 40 C Water temperature 5 C 35 C Water pressure 1bar 5 bar 5 Electr voltage variations from voltage rating s specified SSN on nameplate 10 10 E 3 E zx 1 SERES S55 SSSSS88 SES SSS EXE WSS EL dE see us j 1 e Ne AIR COOLED MODELS WATER COOLED MODELS Kg C Kg C 25 25 10 10 24 j 24 3 23 21 21 22 22 32
5. Have all the electrical and plumbing connections been made and is the water supply shut off valve open 5 Hasthe voltage been tested and checked against the data plate rating 6 Has the water supply pressure been checked to ensure a water pressure of at least 1 bar 14 psi 7 Check all refrigerant lines and conduit lines to guard against vibrations and possible failure 8 Have the bolts holding the compressor down been checked to ensure that the compressor is snugly fitted onto the mounting pads 9 Have the bin liner and cabinet been wiped clean 10 Has the owner user been given the User Manual and been instructed on the importance of periodic maintenance checks 11 Has the Manufacturer s registration card been filled in properly Check for correct model and serial number against the serial plate and mail the registration card to the factory 12 Has the owner been given the name and the phone number of the authorized SCOTSMAN Service Agency serving him Page 11 G INSTALLATION PRACTICE Hand shut off valve Water filter Water supply line flexible hose 3 4 male fitting Vented drain Open trapped vented drain Drain fitting Main switch Power line Aii oONouhRwWwNn a WARNING This icemaker is not designed for outdoor installation and will not function in ambient temperatures below 10 C 50 F or above 40 C 100 F This icemaker will malfunction with water temperature
6. front of control box behind the front louvered panel The thermostat sensing tube is located into a bulb holder on the side wall of the ice storage bin where it automatically shuts the icemaker OFF when in contact with the ice and re starts the icemaker when the ice is removed Factory settings are 1 C 35 F OUT and 4 C 39 F IN E CUBE SIZE CONTROL EVAPORATOR THERMOSTAT The cube size control evaporator thermostat body is located in the front of control box behind the front louvered panel its basically a reverse acting temperature control which closes the contacts 3 2 when its temperature decreases and closes the opposite contacts 3 4 when the temperature rises The thermostat sensing bulb is located into a plastic tube bulb holder secured by two clips directly to the evaporator serpentine This control determines the length of the freezing cycle and correspondingly the size of the cubes A lower setting will produce a larger cube oversize while a higher setting a smaller cuber shallow size When closed on contacts 3 2 it activates the defrost or harvest cycle components The cube size control is set up in the factory knob in the black dot position and doesn t require any adjustment when the ambient temperature remains between 15 and 30 C 60 and 90 F F FAN MOTOR Air cooled version The fan motor is electrically connected in parallel to the water pump and it operates continuously only during the free
7. or three liters of clean potable water to rinse the mold cups and the platen 14 Switch ON again the machine The water pump is again in operation to circulate the water in order to rinse the entire water system Do the operation as per steps 12 and 13 twice so to be sure no more traces of descaling solution remains into the sump 15 With machine in OFF mode pour on the upper side of the evaporator platen fresh water with a capfull of sanitizing solution then turn again the machine in normal operating mode so to sanitize all the water system for approx 10 minutes Page 24 17 Place again the evaporator cover and the unit service panels 18 At completion of the freezing and harvest cycle make sure of proper texture and clearness of the ice cubes and that they do not have any acid taste NOTE Do not mix descaling with sanitizing solution to avoid the generation of a very aggressive acid ATTENTION In case the ice cubes are cloudy white and have an acid taste melt them immediately by pouring on them some warm water This to prevent that somebody could use them 16 Switch OFF the machine and flush out the sanitizing solution from the sump reservoir then with the switch in cleaning position Il switch it ON again When water starts overflowing through the drain line set the switch to operation I position The unit is now ready to resume normal operation 19 Wipe clean and rinse t
8. will tend to produce cloudy coloured ice cubes plus scale build up on parts of the water system WATER SUPPLY Air Cooled Versions Connect the 3 4 male fitting of the solenoid water inlet valve using the flexible tube supplied to the cold water supply line with regular plumbing fitting and a shut off valve installed in an accessible position between the water supply line and the unit If water contains a high level of impurities it is advisable to consider the use an appropriate water filter or conditioner Water Cooled Versions On Water Cooled version the water inlet solenoid valve has two separate outlets one for the condenser and the second for the production of ice Page 10 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 WATER DRAIN WATER COOLED MODELS Connect the 3 4 male fitting of the condenser water drain utilizing a second flexible hose to the open trapped and vented drain NOTE The water supply and the water drain must be installed to conform with the local code In some case a licensed plumber and or a plumbing permit is required F FINAL CHECK LIST 1 Is the unit in a room where ambient temperatures are within a minimum of 10 C 50 F even in winter months 2 Is there at least a 15 cm 6 clearance around the unit for proper air circulation 3 Is the unit level IMPORTANT 4
9. FF during the two phases of the icemaking cycle Refer to the wiring diagram for reference FREEZING CYCLE Electrical components ON OFF Compressor 00 eeeeeeeeteeseeeeeeesseeeeeetneeees Water Pump esee Fan Motor Air cooled only Hot Gas Valve ssssssssess Inlet Water Valve ussssss CLOSE OPEN Evaporator Thermostat contacts 3 4 Electrical Controls Evaporator Thermostat contacts 3 2 Bin Thermostat seussss HARVEST CYCLE Electrical components ON OFF Compressor eeeen Water Pump eene Fan Motor Air cooled only Hot Gas Valve ssssssssssess Inlet Water Valve usssssss CLOSE OPEN Electrical Controls Evaporator Thermostat contacts 3 4 Evaporator Thermostat contacts 3 2 Bin Thermostat ssusssss Freeze Cycle Average Discharge Pressure A C 7 11 bars 100 155 psig Average Discharge Pressure W C 8 5 10 bars 120 140 psig Suction Pressure End Freeze Cycle 0 0 1 bar 0 1 5 psig REFRIGERANT METERING DEVICE capillary tube REFRIGERANT CHARGE R 134 A Model Air cooled Water cooled AC 46 260 gr 9 5 oz 250 gr 9 0 oz AC 56 260 gr 9 5 0z 250 gr 9 0 oz AC 86 280 gr 10 0 oz 250 gr 9 0 oz COMPONENTS DESCRIPTION A WATER PUMP The water pum
10. RODUCED PER 24 HRS Kg 38 37 36 35 34 33 32 31 30 29 28 27 SPECIFICATIONS ELECTRONIC CUBER MODEL AC 86 TRU AIR decent eeanennnenneenmn Accent CCEA 26 25 24 32 WATER TEMPERATURE ch V C 10 AMBIENT TEMPERATURE bond ICE PRODUCED PER 24 HRS Kg 39 38 37 36 35 34 33 32 31 30 29 Important operating requirements MIN MAX Air temperature 10 C 40 C Water temperature 5 C 35 C Water pressure 1bar 5 bar Electr voltage variations from voltage rating specified on nameplate 10 10 WATER COOLED MODELS 21 32 AMBIENT TEMPERATURE 32 27 21 15 10 C WATER TEMPERATURE NOTE With the unit in built in conditions the ice production is gradually reduced in respect to the levels shown in the graf up to a maximum of 10 at room temperatures higher than 32 C The daily ice making capacity is directly related to the condenser air inlet temperature water temperature conditions of the condenser air filter and age of the machine To keep your SCOTSMAN CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on Maintenance and Cleaning section of this manual Page 8 SPECIFICATIONS
11. SION WATER INLET WATER PUMP FAN MOTOR WATER COND VALVE VALVE SERVICE DIAGNOSIS Page 20 SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Unit will not run Red Alarm light ON Red Alarm light Blinking Twice and repeat Blown fuse Main switch in OFF position Bin thermostat set improperly Loose electrical connections Too Hi Condensing Temperature Condenser sensor out of order Replace fuse amp check for cause of blown fuse Turn switch to ON position Adjust rotating its setting screw Check wiring Reset the machine Push amp hold the Reset Buttom for 5 and check for reason why Replace it Compressor cycles intermittently Low voltage Non condensable gas in system Dirty condenser Air circulation blocked Compressor starting device with loose wires Check circuit for overloading Check voltage at the supply to the building If low contact the power company Purge the system Clean with vacuun cleaner air or stiff brush DO NOT use wire brush Allow sufficient air space all around unit Check for loose wires in starting device Cubes too small Cube size control set improperly Capillary tube partially restricted Moisture in the system Shortage of water Shortage of refrigerant Check and adjust for proper operation Blow charge add new gas amp drier after evacuating system with vacuum pump Same as above See remedies
12. ation of air cooled models 2 Level the unit in both the left to right and front to rear directions D ELECTRICAL CONNECTIONS See data plate for current requirements to determine wire size to be used for electrical connections All SCOTSMAN icemakers require a solid earth wire All SCOTSMAN ice machines are supplied from the factory completely pre wired and require only electrical power connections to the wire cord provided at 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 The maximum allowable voltage variation should 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 Al 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 When choosing the water supply for the ice cuber consideration should be given to a Length of run b Water clarity and purity c Adequate water supply pressure Since water isthe mostimportant single ingredient 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
13. cation See incorrect discharge pressure Clean or replace Poor harvest Restriction in incoming water line Too short defrost time Cube size control set for too large cubes Water inlet valve not opening Hot gas valve orifice restricted Air vented holes in mold cups plugged Discharge head pressure too low Check water valve strainer and flow control If necessary enlarge the flow control orifice Check temperature control Replace if necessary Re set cube size control Valve coil with open winding Replace valve Replace hot gas valve assy Clean out holes See incorrect discharge pressure Unit won t harvest Inoperative cube size control Hot gas valve not opening Water solenoid valve not opening Replace cube size control Valve coil with open winding Replace valve Valve coil with open winding Replace valve Incorrect discharge pressure Dirty air filter Inoperative hi press control Water cooled Water inlet valve to condenser partially clogged Clean or replace Replace Clean or replace Excessive water in unit base Water tubing leaking Check Tighten or replace Page 22 MAINTENANCE AND CLEANING INSTRUCTIONS A GENERAL The periods and the procedures for maintenance 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 condition
14. cemakers have been engineered to our own rigid safety and performance standards NOTE Toretain the safety and performance 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 Callyour authorized SCOTSMAN Distributor or Dealer for proper installation 2 Visually inspect the exterior of the packing and skid Any severe damage noted should be reported to the delivering carrier and a concealed damage claim form filled in subjet to inspection of the contents with the carrier s representative present 3 a Cutand remove the plastic strip securing the carton box to the skid b Cutopen the top of the carton and remove the polystyre protection sheet c Pull out the polystyre posts from the corners and then remove the carton 4 Remove the front panel of the unit and inspect for any concealed damage Notify carrier of your claim forthe concealed damage as steted in step 2 above 5 Check that refrigerant lines do not rub against or touch other lines or surfaces and that the fan blade moves freely 6 Check that the compressor fits snugly onto all its mounting pads 7 Remove all internal support packing and masking tape 8 Use clean damp cloth to wipe the surfaces inside the storage bin and the outside of the cabinet 9 See data plate on the rear side of the unit and check that local main voltage co
15. dually reduced in respect to the levels shown in the graf up to a maximum of 10 at room temperatures higher than 32 C The daily ice making capacity is directly related to the condenser air inlet temperature water temperature conditions of the condenser air filter and age of the machine To keep your SCOTSMAN CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on Maintenance and Cleaning section of this manual Page 6 SPECIFICATIONS l l don NEM l HTT E LUN e E Go aa E fe p G ADJUSTABLE FEET 87 3 13 32 6 20 mm 46 25 32 OD OVERFLOW DRAIN L2 49 64 3 4 GAS WATER INLET WATER COOLED UNIT ONLY 206 8 1 8 3 4 GAS WATER INLET p 386 15 13 64 feu Dimensions HEIGHT 695 mm WIDTH 386 mm DEPTH 600 mm WEIGHT 45 Kgs AC 56 CUBER machine specifications Model Cond unit Finish Comp HP Pos HELL AC 56 AS 6 Air i 90 AC 56 WS 6 Water Stainless steel 1 4 12 5 Kg 270 Start Electric power cons Basic electr Amps Amps Watts Kwh per 24 Hr Nr of wires Amps fuse 7 6 230 50 1 2 1 12 400 7 3x1 5mm 10 Cubes per harvest 24 medium A 15 C water temperature Page 7 ice making capacity AIR COOLED MODELS CE P
16. e use tap water always in the counter flow air diretcion Once cleaned shake it so to remove most of the accumulated water then dry it using an hair dryer NOTE Incase the air filter strainer is damaged replace it with a new one 6 Check for refrigerant leaks NOTE The new AC 46 amp AC 56 series in the air cooled version are standard equipped with an air condenser filter as well as a Cleaning Reminder Board to remind to the end user the need for the cleaning of the air filter or ofthe water system Red Alarm Light ON Steady or Blinking rispectively with machine in operation 4 Install it again by pushing it through the front panel opening D CLEANING INSTRUCTIONS OF WATER SYSTEM 1 Remove the front and top panels to gain access either to the control box and to the evaporator 2 M Make sure that all ice cubes have been released from their cups then switch OFF the machine at front master button switch 3 Scoop out all the ice cubes stored into the bin in order to prevent them from being contaminated with the cleaning solution Page 23 4 Removetheplastic cup located onthe bottom of sump freezing chamber to drain out all water and scale deposits 5 Unloose the two thumb scews and remove the curtain 6 Liftuptheentire spray platen from its bottom seat and take it out to clean it separately 7 Using a bottle poor fresh water into the bottom of
17. for shortage of water Check for leaks amp recharge Cloudy cubes Shortage of water Dirty water supply Accumulated impurities See remedies for shortage of water Use water softner or water filter Use SCOTSMAN Ice Machine cleaner Shortage of water Water spilling out through curtain Water solenoid valve not opening Water leak in sump area Water flow control plugged Check or replace curtain Replace valve Locate and repair Remove and clean Page 21 SERVICE DIAGNOSIS SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Irregular cubes size amp some cloudy Some jets plugged Shortage of water Unit not levelled Poor pumping Remove jet cover and clean See shortage of water Level as required Check and or replace the water pump Cubes too large Cube size control set improperly Check and adjust for proper operation Decreased ice capacity Inefficient compressor Leaky water valve Non condensable gas in system Poor air circulation or excessive hot location Overcharge of refrigerant Capillary tube partially restricted Undercharge of refrigerant Discharge head pressure too high Clogged air filter Replace Repair or replace Purge the system Relocate the unit or provide for more ventilation Correct the charge Purge off slowly Blow charge add new gas amp drier after evacuating system with vacuum pump Charge to data plate indi
18. he inner surfaces of the storage bin REMEMBER To prevent the accumulation of undesirable bacteria it is necessary to sanitize every week the interior of the storage bin
19. hrough the drier filter then it goes all the way through the capillary tube where it looses its pressure Next the refrigerant enters into the evaporator serpentine which has a larger diameter then the capillary tube and starts to boil off this reaction is emphasized by the heat transferred by the sprayed water The refrigerant then increases in volume and changes entirely into vapor The vapor refrigerant then passes through the suction accumulator used to prevent that any small amount of liquid refrigerant may reach the compressor and through the suction line In both the accumulator and the suction line it exchanges heat with the refrigerant flowing into the capillary tube warmer before to be sucked in the compressor and to be recirculated as hot compressed refrigerant gas The freezing cycle is controlled by the evaporator thermostat which has its bulb in contact with the evaporator serpentine The electrical components in operation during the freezing cycle are COMPRESSOR WATER PUMP FAN MOTOR in air cooled version On the air cooled versions the refrigerant head pressure is gradually reduced from a value of approx 11 bars 155 psig at the beginning of the freezing cycle with the unit at 21 C 70 F ambient temperature to a minimun value of approx 7 bars 100 psig just at the end of the freezing cycle few seconds before the starting of the defrost cycle The declining of the pressure is relied to the reducti
20. ing tempe rature is higher of its setting value or signal out the need for the cleaning of the condenser air filter air cooled only or of the water system The time between the signal out for the cleaning ofthe water system can be modified according to the setting of the two Dip Switches as below TIME 1 2 1 MONTH ON ON 3 MONTHS OFF ON 6 MONTHS ON OFF 1 YEAR OFF OFF Once cleaned the water system it s necessary to cancel the time stored into the PC Board by Page 17 pushing and hold for more then 20 the Red Alarm Re Set Button till it starts to blink N CONDENSER AIR FILTER Air cooled version Located in front of the air cooled condenser can be removed by withdrawing itthrough the opening of the front panel for cleaning or replacing A lower plastic guide installed inside the unit is oe for the correct sliding and location of the air ilter O CONDENSER SENSOR The condenser temperature sensor probe located within the condenser fins air cooled version or in contact with the tube coil water cooled version detects the condenser tempe rature variations and signals them by supplying current at low voltage to the P C BOARD In case the condenser temperature rises and reaches 70 C 160 F on air cooled models or 60 C 140 F on water cooled models the current arriving to the micro processor is such to cause an immediate and total stop of the machine operation Page 18
21. ion be sure to adjust only in maximum of one eighth turn of contro knob rotation at a time Clockwise rotation corresponds to a colder setting Counterclockwise rotation corresponds to a warmer setting SMALL IDENTATION NORMAL SIZE AHAPE LITTLE OR NO ICE IN CENTER OF CUBE SHALLOW SIZE THICK BULGE SOLID ICE OVER SIZE Page 19 BN BU GY GN RD YE WH 06 PK WIRING DIAGRAM AC 46 AC 56 AIR AND WATER COOLED 230 50 60 1 The unit is shown on freezing cycle BROWN v BLUE Su GREY GRIGIO n Oz GNYE GREEN YELLOW zx GREEN RED 1 YELLOW m WHITE gt ORANGE n Dd PINK 1 HM HM M M g S 4 x TU zx e x N ya na i lt G amp L a Sz COMPRESSOR gt fee eye oe el dE ES l So I E j 4 o HA Nx E lo xa T r3 s i 9 o I o 4l Pee See 4 Qt n Sx 9 EE Paen s mz zo I Na ACY ng Sx i xu ae DA 1 L CUN min M c n 7 o Z WATER PRESSURE CONTROL 13S3d m pom a a a amp lan di L 4 8 El m B 5 zo ao Sq Ip TEE oo E Nc Ne le m 2 E is ya De cs v z fos 1 ig l e I Na x ng E l o A ic f l na ET na lt E oon ced ONLY FOR WATER COOLED VERSION ONLY FOR AIR COOLED VER
22. located in front of the control box until the desired size is achieved If the ice cubes are shallow and cloudy it is possible that the ice maker runs short of water during the end of the freezing cycle or the quality of the supplied water requires the use of an appropriate water filter or conditioner L During the defrost or harvest cycle hold a handful of ice cubes against the bulb of the storage bin thermostat the icemaker switch OFF in about one two minutes Take outthe ice from the storage bin thermostat The ice maker should restart automatically in three four minutes NOTE The bin thermostat is factory set at 1 C 35 F OUT and 4 C 39 F IN M Reffittheunitfront panel then instruct the owner user on the general operation of the ice machine and about the cleaning and care it requires Page 13 PRINCIPLE OF OPERATION How it works In the SCOTSMAN cube ice makers the water used to make the ice is kept constantly in circulation by a water pump which primes if to the spray system nozzles from where it is diverted into the inverted cup molds of the evaporator Fig A A small quantity of the sprayed water freezes into ice the rest of it cascades by gravity into the sump assembly below for recirculation FREEZING CYCLE Fig B The hot gas refrigerant discharged out from the compressor reaches the condenser where being cooled down condenses into liquid Flowing into the liquid line it passes t
23. mm WEIGHT 42 Kgs AC 46 CUBER machine specifications Model Cond unit Finish Comp HP PT ren AC 46 AS 6 Air f 77 AC 46 WS 6 Water Stainless steel 1 4 9 Kg 350 Start Electric power cons Basic electr Amps Amps Watts Kwh per 24 Hr Nr of wires Amps fuse 8 230 50 1 2 1 12 400 6 3x 1 5 mm 10 Cubes per harvest 18 medium A 15 C water temperature Page 5 ice making capacity ICE PRODUCED PER 24 HRS zou 7 N SPECIFICATIONS ELECTRONIC CUBER MODEL AC 56 pa J Ea N oS 5 4 q S r 1r 1 1 SSS p Seu RES 1 SESS SSeS SESS SSE SESS 1r eal 1 SSSSS S55 i SSS S55 ia 8 caer 1 d e AIR COOLED MODELS Kg C 32 32 38 32 27 21 15 10 C WATER TEMPERATURE AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS Kg 33 32 31 30 29 28 27 26 25 24 23 Important operating requirements Air temperature Water temperature Water pressure Electr voltage variations from voltage rating specified on nameplate 32 27 21 15 WATER TEMPERATURE 10 MIN 1 1 0 C 5 C bar 10 WATER COOLED MODELS C 10 21 32 38 C AMBIENT TEMPERATURE MAX 40 C 35 C 5 bar 10 NOTE With the unit in built in conditions the ice production is gra
24. on of the evaporating pressure caused by the progressive growth of the ice thickness into the inverted cup molds and to the flow of air drown through the air cooled condenser by the fan motor The above values are in relation as well to the ambient temperature of the ice maker site and they are subject to rise with the increase of this temperature On the water cooled versions the refrigerant head pressure ranges between 8 5 and 10 bars 120 140 psig being controlled by an automatic hi pressure control that energizes a water solenoid valve located on the water line to the condenser which rates the cooling water to the condenser At the start of the freezing cycle the refrigerant suction or lo pressure lowers rapidly to 1 0 bar 14 psig then it declines gradually in relation with the growing ofthe ice thickness to reach at the end of the cycle approx 0 0 1 bar 0 1 5 psig with the cubes fully formed inthe cup molds Thetotal length ofthe freezing cycle ranges from 23 to 25 minutes DEFROST OR HARVEST CYCLE Fig D When the temperature of the evaporator thermostat in contact with the evaporator serpentine drops to a pre set value it changes its electrical contacts energizing the following components COMPRESSOR WATER INLET SOLENOID VALVE HOT GAS SOLENOID VALVE The incoming water passing through the water inlet valve and the flow control runs over the evaporator platen and then flows by gravity through the dribble
25. p operates continually throughout the freezing cycle The pump primes the water from the sump to the spray system and through the spray nozzles sprays it into the inverted cup molds to be frozen into crystal clear ice cubes B WATER INLET SOLENOID VALVE 3 4 MALE FITTING The water inlet solenoid valve is energized only during the defrost cycle When energized it allows a metered amount of incoming water to flow over the evaporator cavity to assist the hot gas in defrosting the ice cubes The water running over the evaporator cavity drops by gravity through the dribbler holes of the platen into the sump On water cooled versions the water inlet solenoid valve has one inlet and two outlets with two separate solenoids energized the first ice productioon by the contacts 3 2 of the evaporator thermostat and the second water cooled condenser by a specific hi pressure control C HOT GAS SOLENOID VALVE The hot gas solenoid valve consists basically in two parts the valve body and the valve coil Located on the hotgas line this valve is energized by the contacts 3 2 of the evaporator thermostat during the defrost cycle During the defrost cycle the hot gas valve coil is activated so to attract the hot gas valve piston in order to give way to the hot gas discharged from compressor to flow directly into the evaporator serpentine to defrost the formed ice cubes D BIN THERMOSTAT The bin thermostat control body is located in the
26. peration COMPRESSOR WATER PUMP FAN MOTOR in air cooled version F Check to see through the ice discharge opening thatthe spray system is correctly seated and that the water jets uniformely reach the interior ofthe inverted cup molds also make sure thatthe plastic curtain is hanging freely and there is not excessive water spilling through it G The ice making process takes place thereby with the water sprayed into the molds that gets gradually refrigerated by the heat exchanged with the refrigerant flowing into the evaporator serpentine H Whenthe evaporatortemperature reaches apresetvaluethe evaporator thermostat or cube size control changes its contacts the freezing cycle ends and starts the defrost or harvest cycle Freezing time will range between 20 and 22 minutes in a 21 C ambient temperature Longer timefortemperature above shorter when below Average complete cycle range is about 23 to 25 minutes l Check during the first defrost harvest cycle that the incoming water flows correctly into the sump in order to re fill it and the surplus overflows through the overflow drain tube J Check the texture of ice cubes just released Rightsize musthave a small depression about 5 6 mm in their crown If not wait for the second defrost harvest cycle before performing any adjustment K If required the length ofthe freezing cycle can be modified by turning the knob of the cube size control or evaporator thermostat
27. r holes down into the sump reservoir Fig C The water filling the sump reservoir forces part of the surplus water from the previous freezing cycie to go out to the waste through the overflow pipe This overflow limits the level of the sump water which will be used to produce the next batch of ice cubes Meanwhile the refrigerant as hot gas discharged from the compressor flows through the hot gas valve directly into the evaporator serpentine by passing the condenser The hot gas circulating into the serpentine of the evaporator warms up the copper molds causing the harvest of the ice cubes The ice cubes released from the cups drop by gravity onto a slanted cube chute then through a curtained opening they fall into the storage bin When the temperature of the evaporator thermostat bulb reaches the value of 3 4 C their electrical contacts move back to the previous position activating a new freezing cycle and deenergizing both the hot gas and the water inlet valves closed NOTE The length of the defrost harvest cycle not adjustable changes according to the ambient temperature shorter for hi ambient temperature and longer for low one Page 14 Page 15 OPERATION ELECTRICAL SEQUENCE The following charts illustrate which switches and components are ON or O
28. rature is higher then 70 C aircooled version ON steady with machine in OFF mode Condensing temperature is higher then 60 C water cooled version ON steady with machine in OFF mode Condenser sensor out of order Blinking twice and repeat with machine in OFF mode Condenser air filter need to be cleaned ON steady with machine in ON mode Water system need to be cleaned Slow blinking with machine in ON mode On the first two cases it s possible to Re Set the operation of the machine pushing and hold the Red Alarm Re Set Button by 5 till the Red Light is OFF On the third case it s necessary first to replace the condenser sensor then push and hold for 5 the Red Re Set Button M CLEANING REMIND PC BOARD Located on the front left side of the machine it works in conjuction with the condenser sensor and the Red Alarm Re Set Push Button It consists of a Printed Circuit Board with a step down transformer 230V 12V a relay a Dip Switch with two keys a Jumper for the set up of the Cut OFF Alarm condensing temperature 70 C jumper OUT for air cooled version and 60 C jumper IN for water cooled version a green four contacts connector for power IN and OUT a Red socket for the Water Level Sensor future use on EC series only a Black socket for the Condenser Sensor and a White socket for the Red Alarm Re Set Push Button The main function of this PC Board is to switch OFF the machine when the condens
29. rresponds with the voltage specified on it CAUTION Incorrect voltage supplied to the icemaker will void your parts replacement program 10 Remove the manufacturer s registration card from the inside of the User Manual and fill in all parts including Model and Serial Number taken from the data plate Forward the completed self addressed registration card to Frimont factory 11 Ifnecessary replace the four standard legs with the taller ones supplied in the machine and adjust them to level the unit C LOCATION AND LEVELLING WARNING This Ice Cuber is designed for indoor installation only Extended periods of operation at temperatures 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 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 cooled models d Service access adequate space must be leftfor all service connections through the rear of the ice maker A minimum clearance of 15 cm 6 must be left at the sides of the unit for routing cooling air drawn into and exhausted out of the compartment to maintain proper condensing oper
30. s and the ice volume produced and each icemaker must be maintened individually in accordance with its particular location requirements B ICEMAKER The following maintenance should be scheduled at least two times per year on these icemakers 1 Check and clean the water line strainer 2 Check that the icemaker is levelled in side to side and in front to rear directions 3 Check for water leaks and tighten drain line connections Pour water down bin drain line to be sure that drain line is open and clear 4 Check size condition and texture of ice cubes Perform adjustment of cube size control as required 5 Check the bin thermostat to test shut off Put a showelfull of ice cubes in contact with the bin thermostat bulb for at least one minute This should cause the ice maker to shut off Within few seconds after the removal of the ahowelfull of ice from bin thermostat bulb the icemaker restarts NOTE Within minutes after the ice is removed from the bulb holder tube the sensing bulb inside the tube will warm up and cause the icemaker to restart This control is factory set and should not be reset until testing is performed C CLEAN REPLACE OF AIR CONDENSER FILTER 1 Withdraw the air filter from the front through the opening of the front panel L 2 Blowpressurised air on the opposite direction of the condenser air flow so to remove the dust accumulated 3 If pressurised air is not availabl
31. s below 5 C 40 F or above 35 C LIT Jl e aff C _ 5 Page 12 OPERATING INSTRUCTIONS START UP After having correctly installed the ice maker and completed the plumbing and electrical connections perform the following Start up pro cedure A Withdraw the condenser air filter then remove the unit front panel and locate the cleaning switch on the control box B Set the cleaning switch in the cleaning position This will close the electrical circuit to the water inlet valve and to the hot gas valve C SwitchONthepowerline disconnect switch and push the green button switch Unit will start up in charging cycle mode During this cycle the components energized are WATER INLET SOLENOID VALVE HOT GAS SOLENOID VALVE The Water pump and the Fan motor in the air cooled versions are also in operation D Let unit stay in charging cycle for about three four minutes till water is coming out from the drain hose then move the cleaning switch to the operation position NOTE During the charging cycle the water inlet solenoid valve is energized The water flows through the valve to the back side of the evaporator platen and then down to fill up the icemaker sump for the next freezing cycle OPERATIONAL CHECKS E The unit now starts its first freezing cycle with the following components in o
32. the sump freezing chamber to clean out most of scale deposit 8 Install again the spray platen the curtain as well as the bottom plastic cup 9 Prepare the cleaning solution by diluting in a plastic container two liters of warm water 45 50 C with 0 2 liters of Ice Machine Cleaner WARNING The SCOTSMAN Ice Machine Cleaner contains Phosphoric and Hydroxyacetic acids These compounds are corrosive and may cause burns if swallowed DO NOT indu ce vomiting Give large amounts of water or milk Call Physician immediately In case of external contact flush with water KEEP OUT OF THE REACH OF CHILDREN 10 Remove the evaporator cover then slowly pour onto the evaporator platen the cleaning solution With the help of a brush dissolve the most resistant and remote scale deposits in the platen 11 Switch ON again the machine atfront master button switch to start the icemaking process Allow the ice maker to operate for about 20 minutes Then turn the cleaning switch to the cleaning position Il till the release of the ice cubes from their cups NOTE 7he amount of Cleaner and the time needed for the cleaning of water system depends of the water conditions 12 Switch OFF the ice maker at master button switch then flush out the cleaning solution from the sump reservoir by taking off the sump plastic cup Once flushed out install again the sump plastic cup 13 Pour onto the evaporator cavity two
33. zing cycle keeping the proper head pressure by circulating air through the condenser fins G 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 hot gas which is then released through the discharge valve H WATER SPRAY SYSTEM Through its nozzles it sprays the water in each individual cup to be frozen into ice l CLEANING SWITCH Located on the bottom side of the control box is used to energize the water inlet and the hot gas valves so to charge the water into the sump of the machine when neaded J HIPRESSURE CONTROL Water cooled version Used only on the water cooled versions itoperates to keep between 8 5 and 10 bars 120 140 psig the hi side or discharge pressure of the refrigerant system by energizing the coil of the water inlet solenoid valve that control the cooling water flow to the condenser K GREEN MASTER SWITCH PUSH BUTTON Located in the front of the machine it s used to switch ON and OFF the unit by pushing its green push button When ON its green light is ON as well Page 16 L RED ALARM RE SET PUSH BUTTON Located in the front of the machine just beside the Master Switch it works in conjuction with the Cleaning Remind Board and it s activated when Consensing tempe

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