MC 1210 - Scotsman Ice Systems
Contents
1. SCOTSMAN o SERVICE MANUAL M 1210 Electronic modular cubers 090086 33 REV 03 94 597 2 7 o a TABLE CONTENTS Table of contents page Specifications MC 1210 GENERAL INFORMATION AND INSTALLATION Introduction Unpacking and Inspection Modular Cuber Unpacking and inspection Storage Bin Location and levelling Stacking installation Mixed units installation Electronic units installation Electrical connections Water supply and drain connections Final check list Installation practice OPERATING INSTRUCTIONS Start up Operational checks OPERATING PRINCIPLES How it works Freezing cycle Defrost or Harvest cycle Operation Control sequence Operation Electrical sequence Component description ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES Adjustment of the cube size Replacement of evaporator temperature sensor Replacement of condenser temperature sensor Replacement of ambient temperature sensor Replacement of ice level light control Replacement of P C Board Replacement of the water pump Replacement of water inlet solenoid valve Removal of the flow control Replacement of hot gas valve coil Replacement of water drain solenoid valve Replacement of water drain electronic timer Replacement of fan motor Replacement of spray bar Replacement of drier Replacement of hot gas valve body Replacement of evaporator platen Replacement of air cooled condenser R2. ELECTR TIMER BIN TEMPERATURE SENSORS PROCESSOR COMPRESSOR WATER IN VALVE ELECTRONIC CARD NOTE With the system CLEANING mode the water pump is the only component in operation to circulate the cleaning solution in the entire water system 7 Let the unit to remain in the CLEANING mode for about 20 minutes then turn the program selector on STAND BY again 8 Flush out the cleaning solution from the sump reservoirs then pour onto each evaporator cavity two or three liters of clean potable water with a capfull of antibacteria solution to rinse and sanitize the mold cups and the platen If necessary remove the water spray bar to clean itseparately as per steps 3 and 4 of paragraph B 9 Turn again the program selector on CLEANING The water pump is again in operation to circulate the water and the antibacterial solution in order to rinse the entire water system 10 Flushouttherinsing solution from the sump reservoir then turn the program selector on RE SET HI TEMPERATURE position and immediately afterward to FREEZING OPERATION Page 33 NOTE By setting the selector on RE SET first and then to FREEZING OPERATION the ice maker will perform the 5 minutes WATER FILLING phase i e the water inlet solenoid valve opens to allow the incoming water to rinse again the water system and to properly fill up the sump reservoir for the next freezing cycle
3. Page 3 SPECIFICATIONS N T 182 167 1 A g 2 EI g lt s s 5 5 RA 1677 166 sl ej 1125 44 1 47 8 Ble 8 CUBE CHUTE EXITS BOTTOM SIDE 4 2 f i W S U i p 775 30 1 2 sy 115 4 1 27 Dum EM ley 525 20 5 8 630 243 47 e NE INIT jm 2j 7 670 0 WATER OUTLET N WATER OUTLET WATER COOLEO ONLY 8 7 8 0 0 WATER OUTLET 3 4765 ZB OUTLET p i ayarcag MATER INLET WATER COOLED ONLY 1 670 0 OUTLET i o 2 a L 3 4645 HATER INET ER CORD SET 00 00 00 ACCESSORIES KSC 1210 Cube stacking kit DIMENSIONS HEIGHT 810 mm WIDTH 1677 mm DEPTH 775 mm WEIGHT Kgs MC 1210 MACHINE SPECIFICATIONS Model Cond unit Finish Comp HP Water req 1 24 HR MC 1210 AS Air Stainless steel 5 1300 MC 1210 WS Water Stainless steel 10200 Start Electric power cons electr amps Watts Kwh x 24 HR N of wires Amps fuse MC 1210 AS MC 1210 WS 52 4000 80 5 2 5 mm 20 Cubes per harvest MCL 288 large MCM 408 medium MCS 792 small 1 Subject to variation according to different water and ambient temperature conditions Page 4 GENERAL INFORMATION AND INSTALLATION A INTRODUCTION This manual provides th
4. 11 Place again the evaporator cover and the unit service panels 12 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 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 13 Wipe clean and rinse the inner surfaces of the storage bin REMEMBER To prevent the accumulation of undesirable bacteria it is necessary to sanitize the interior of the storage bin with an anti algae disinfectant solution every week EVAPORATOR wm N P ELECTR lt a u ea COMPRESSOR WATER IN VALVE ELECTRONIC CARD
5. 1 Remove front center upper and lower panels and as well the top one 2 Remove the insulation from the suction line and withdraw the sensor probe from its holder 3 Trace the evaporator sensor terminal plug on the rear side of the control box and remove it fromits socket by carefully pulling outthe terminal plug securing clip 4 Toinstall the replacement evaporator sensor follow the above steps in reverse C REPLACEMENT OF CONDENSER TEMPERATURE SENSOR 1 Removefront center upper and lower panels 2 Trace the condenser sensor probe located within the condenser fins on air cooled version and withtrow it Onwater cooled version remove it by opening the plastic strap reusable securing the probe to the refrigerant liquid line 3 Trace the condenser sensor terminal plug on the rear side of the control box and remove it fromits socket by carefully pulling outthe terminal plug securing clip 4 Toinstallthereplacementcondenser sensor follow the above steps in reverse D REPLACEMENT OF AMBIENT TEMPERATURE SENSOR 1 Remove frontcenter upper and lower panels 2 Trace the ambient sensor probe holded its metal bracket in front of the condenser fins on air cooled version and remove it by unloosing its securing plastic clamp On water cooled version remove it by opening the plastic strap reusable securing the probe on the water supply line to the condenser 3 Trace the ambient sensor terminal plug on t
6. As the electronic timer has carried the system throughout the second phase of freezing cycle the defrost cycle starts ATTENTION In case the unit be able to reach 0 C 32 F evaporating temperature within 15 minutes but after 45 minutes from the beginning of the freezing cycle it has not yet reached the evaporator tem perature of 15 C 5 F the machine goes straight into the defrost cycle omitting the timed portion of the freezing cycle relied to the setting of the first four DIP SWITCHES NOTE The length of the defrost cycle is pre determined by the setting of the DIP SWITCH KEYS NO 5 6 and 7 and it is relied as well to the ambient temperature as detailed in Table C The electrical components in operation during this phase are COMPRESSOR WATER PUMPS WATER INLET SOLENOID VALVES HOT GAS SOLENOID VALVES WATER DRAIN SOLENOID VALVES for the first 15 20 seconds 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 dribbier holes down into the sump reservoir Fig D The water filling the sump reservoir forces part of the surplus water from the previous freezing cycle 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 high pressure high temperature refrigerant discharged from the
7. diverted into the inverted mold cups of the evaporator Fig B Asmall 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 A The hot refrigerant gas discharged out from the compressor reaches the condenser where being cooled down condenses into liquid Flowing into the liquid line it passes through the drier filter then it goes all the way through the capillary tube where due to the heat exchanging action it looses some ofits heat content so thatits pressure and temperature are lowered as well Next the refrigerant enters into the evaporator serpentine which has a larger 1 0 then the capillary 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 refrigerant vapor 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 itexchanges heat with the refrigerant flowing into the capillary tube warmer before to be sucked in the compressor and to be recirculated as high pressure high temperature gas The freezing cycle is controlled by the evaporator temperature sensor which has its probe in contact with the evaporator serpentine that determines the length of
8. too high condensing tempe rature The five LEDS placed in a row in the front of the P C BOARD monitor the following situations GREEN LIGHT Unit under electrical power YELLOW LIGHT Unit shut off at full storage bin condensing temperature blinking Unit shut off due to too hi evaporating temperature RED LIGHT ETE EE Unit shut off due to hi ep ft YELLOW LIGHT Unit in freezing operation YELLOW LIGHT i Unit in cleaning rinsing mode F SWITCH The P C BOARD which controls the entire operation of the ice maker has a DIP SWITCH with ten switching keys which allow to set up the micro processor program in order to extend or to shorten the length of freezing and defrost cycles in relation to the different models and versions of ice machines 21 The DIP SWITCH first four keys setting cycle controlled by the electronic timer as determines the length of the 2nd phase of freezing detailed in table B LENGHT OF TIMED PORTION OF FREEZING CYCLE ACCORDINGLY TO THE DIP SWITCH SETTING COMBINATIONS 1 2 3 4 1 2 3 4 1 Q DET 8 N m TE 2 X mm mu 23 min on m 9 min A Dm 10 5 n 4 me m UO Enn ii 5 mm mm w 7 2 WB 3 m ON ON NEM Mm u 6 OFF muu 15 13 OFF 1 min ON NEM 7 13 min DIP SWITCH keys 5 6
9. unit in order to fill the air gap between the two machines 12 Place again in their position the ice chutes and finally re fit the service panels previously removed 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 6 of the data plate rating Low voltage can cause faulty functioning and may be responsible for serious damage to the overload switch and motor windings NOTE All external wiring should conform to national state and local standards and regulations Check voltage on the line and the ice maker s data plate before connecting the unit 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 is the most important single ingredient in producting ice you cannot emphasize too much the three items listed above Low water pressure below 1 bar may cause malfuncti
10. CARD EVAPORATOR BIN TEMPERATURE SENSORS 72 TRANSE C zp COMPRESSOR WATER IN VALVE 27 ELECTRONIC CARD temperature falls below established value the evaporator temperature sensor supplies a low voltage power signal to the electronic control device P C BOARD in order to activate an electronic timer This one takes over the control of the freezing cycle up to the complete formation of the ice cubes Fig 4 NOTE The length of the entire freezing cycle is governed by the evaporator temperature sensor which has its probe placed in contact with the evaporator serpentine Non adjustable in combination with the electronic timer Adjustable incorporated in the P C BOARD The timer adjustment is factory set in consideration of the cooling version and of the ice cube size Small Medium Large It is possible however to modify the timed length of the freezing cycle by changing the DIP SWITCH keys setting In Table B of PRINCIPLE OF OPERATION are shown the various time extensions of the freezing cycle second phase in relation with the different DIP SWITCH keys settings I After about 17 20 minutes from the beginning of the freezing cycle in an hypothetic ambient temperature of 21 C the defrost cycle takes place with the hot gas and the water inlet valves being simoultaneously activated Fig 5 The electrical components in operation are COMPRE
11. Check for refrigerant leaks C CLEANING INSTRUCTIONS OF WATER SYSTEM 1 Removeleft center and right front panels to gain access either to the control box and to the evaporators 2 Wait till the end of defrost cycle then with the help of anormal screwdriver turn the program selector head on STAND BY position to temporarely stop the operation Fig 7 3 Prepare for each freezing chamber the cleaning solution by diluting in a plastic container two or three liters of warm water 45 50 C with a 0 2 0 3 liters of SCOTSMAN 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 induce 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 4 Scoop out all the ice cubes stored into the bin in order to prevent them from being contaminated with the cleaning solution then flush out the water from the sump reservoir by bending down the vertical sump drain hose 5 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 Perform the same for all the four evaporators 6 Set the program selector head on CLEANING The 5th YELLOW LED lights up Fig 8
12. Do not replace the drier until all other repairs or replacements have been completed 4 To install the replacement hot gas valve body follow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after hot gas valve replacement Q REPLACEMENT OF EVAPORATOR PLATEN 1 Remove top and rear panels 2 Remove the plastic cover from the upper part of the evaporator platen 3 Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it 4 Unsolder and disconnect the capillary tube and hotgas line from one serpentine of evaporator and the suction discharge line from the other serpentine 5 Lift the evaporator platen assembly out of its seat NOTE Always install a replacement drier whenever the sealed refrigeration system is open Do not replace the drier until all other repairs or replacements have been completed L 6 Toinstallthe replacement evaporator follow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after evaporator replacement R REPLACEMENT OF AIR COOLED CONDENSER 1 Remove front central upper and lower panels 2 Remove from the condenser fins the condenser sensor probe as well as the ambient temperature sensor probe 3 Remove the screws attaching the condenser to the unit frame 4 Recover the refrigerant from
13. fitted in its plastic box located in the front of the unit consists of two separated printed circuits one at high and the other at low voltage integrated with a program selector of five aligned LEDS monitoring the operation of the machine oftwo extra monitoring RED LEDS of one DIP SWITCH with ten keys of input terminals for the leads of the sensor probes and input and output terminals for the leads of the ice maker electrical wires The P C BOARD is the brain of the system and it elaborates through its micro processor the signals received from the four sensors in order to control the operation of the different electrical components ofthe ice maker compressor water pump solenoid valves etc By turning the program selector it is possible to put the unit in the following different situations CLEANING RINSING The water pump is the only electrical component in operation and it must be used during the cleaning or the rinsing procedure of the water system of ice machine STAND BY The unit remain under electrical power but OUT of operation It can be used by the service engineer in order to stop the unit during the service and inspection operations IN OPERATION The unit is running through the freezing and defrost cycles stopping automatically only at full bin situation RE SET HI TEMPERATURE To be selected to resume the unit operation when the ice maker shuts off due to the intervention of the condenser temperature sensor
14. front of the P C Board 2 Take note of the combination of the first four DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table B 3 Change the same DIP SWITCH KEYS setting sothatitwill correspondto the combination on table B preceding the one remarked at step 2 This will allow an extension of the freezing cycle of two more minutes 4 Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved See figure ll Ifthe cubes are oversize Indentation is too full probably the length of the second phase of the freezing cycle is too long To shorten such length you have to 1 Locate the DIP SWITCH on the front of the P C Board 2 Take note of the combination of the first four DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table 3 Change the same DIP SWITCH KEYS setting so that it will correspond to the combination on table B coming next to the one remarked at step 2 This will reduce the freezing cycle length of two minutes SMALL IDENTATION NORMAL SIZE SHAPE LITTLE OR NO ICE IN CENTER OF CUBES SHALLOW SIZE THICK BULGE SOLID ICE OVER SIZE 4 Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved See figure Page 24 REPLACEMENT EVAPORATOR TEMPERATURE SENSOR
15. lay it down on its rear side and fit the four legs into their sockets 3 Remove all internal support packing and masking tape as well as the plastic ice cube deflector 4 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 pe LOCATION AND LEVELLING WARNING This Ice Cuber is designed for indoor installation only Extended periods of operation at temperature exceeding the following limitations will constitute misuseundertheterms ofthe SCOTSMAN Manufacturer s Limited Warranty resulting in LOSS of warranty coverage 1 Position the Bin 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 40 C 100 F c Well ventilated location for air cooled models Clean the air cooled condenser at frequent intervals d Service access adequate space must be left for 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 operation of air cooled models 2 Level the Storage Bin Assy in bo
16. mail the registration card to the factory 12 Has the owner been given the name andthe phone number of the authorized SCOTSMAN Service Agency serving him H INSTALLATION PRACTICE ANY WN WI KNININ 1 Handshut off valve 2 Waterfilter 3 Water supply line flexible hose 3 4 male fitting Power line Main switch Drain fitting Vented drain Drain fitting Vented drain Open trapped vented drain O O 9N 00 100 F WARNING This icemaker is not designed for outdoor installation and will not function in ambient temperatures below 10 C 50 F or above 40 C 100 F This icemaker will malfunction with water temperatures below 5 C 40 F or above 40 C Page 10 OPERATING INSTRUCTIONS START UP After having correctly installed the ice maker and completed the plumbing and electrical connections perform the following Start up procedure A Remove the unit front panel and locate the control box B Through the contro box cover locate the grooved head similar to a fillister screw head of the electronic program selector With the help of a regular screwdriver turn the selector head in the OPERATION position The screwdriver bit must fit the head slot end to end this to avoid to spoil the selector head slot C Give power to the unit to start it up by m ON the power line main disconnect switch NOTE Every time t
17. request to allow the installation of two Modular Cubers one on top of the other The Stacking Kit is consisting of a two plastic reinforced Ice Chute Connections b an Interface P C Board c an Extension Cable enabling to cover any stacking installation combination as a When stacking an Electronic Modular Cuber on an Electromechanical type Earlier series b When stacking two Electronic Modular Cubers Mixed units installation 1 Unloose the screws and remove the top panels 2 Trace and remove from the top of the evaporator of Electronic Cuber the metal bracket to be used to secure the ice level control assy inside the storage bin 3 Liftalittle bit the Modular Cuber front side in order to be able to mount the ice level control bracket 4 Put the Electronic Modular Cuber on top of the Electromechanical unit 5 Remove the ice chutes from both the units and insert through the ice discharge openings of the upper unit the plastic reinforced Ice Chute Connections 6 Disconnect the ice level contro terminal plug from the P C BOARD of Electronic Modular Cuber 7 Install and secure the ice level control assy onits bracket by means of the two screws supplied with the unit 8 Directthe ice level control cable first to pass through the ice discharge opening of the bottom Page 6 machine with the protective sheath correctly located in correspondance of this opening and then to pass throu
18. upper panel 2 Remove all sensor terminal plugs located on the rear side of P C Board by carefully releasing them out from their sockets clips 3 Disconnect the terminal board connection plug from the rear side of P C BOARD then unloose the four screws holding the same to the plastic control box and remove it 4 To install the replacement P C BOARD follow the above steps on reverse G REPLACEMENT OF THE WATER PUMP 1 Remove left or right front panels 2 Locate the water pump in the front left corner of the evaporator chamber 3 Remove the plastic ice chute and through the ice discharge opening trace the plastic hose and disconnectit from the port of the pump body 4 Unloose the screw and the yellow green ground wire Trace the pump electrical wire leads and disconnect them 5 Remove the two screws securing the pump to sump tank 6 Pull out the pump assy from sump 7 install the replacement pump follow the above steps in reverse H REPLACEMENT OF WATER INLET SOLENOID VALVE 1 Close the shut off valve on the water supply line and disconnect it from the water inlet fitting at the rear of the modular cuber 2 Remove the rear center panel and disconnect the electrical leads from the solenoid valve 3 Unscrew the two screws securing the inlet solenoid valve to the cabinet 4 Remove the corbin clamps and plastic hose the valve is now free 5 install the replacement water
19. water passing through an hole located in one arm of the spray bar and through its four nozzles the pumped water is sprayed in each individual cup to be frozen into ice H WATER PUMP 4 per unit The water pump operates continually throughout the freezing and defrost cycle to prime the water from the sump to the self propelling spray bar and through the four spray nozzles it sprays it into the inverted cup molds to be frozen into crystal clear ice cubes The water pump remains in operation even during the defrost cycle in order to help the release of the ice cubes It is recommended that the pump motor bearings be checked at least every six months 22 I WATER INLET SOLENOID VALVE 3 4 MALE FITTING 2 per unit The water inlet solenoid valve is activated by the micro processor of the P C BOARD during the first 5 minutes of water filling phase and as well 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 reservoir where it will be sucked by the water pump and primed to the spray system J HOT GAS SOLENOID VALVE 2 per unit The hot gas solenoid valve consists basically in two parts the valve body and the valve coil Located on the hot gas line this valve is energized th
20. 7 setting according to the ambient temperature sensor as determines the length of the defrost cycle specified in table C LENGHT OF DEFROST CYCLE IN SEC ACCORDING TO THE AMBIENT TEMPERATURE AND TO THE DIP SWITCH SETTING COMBINATIONS 5 6 7 0 5 C 5 10 10 15 15 20 C 20 25 25 30 C 30 35 35 40 ON n LI Li n a Es 180 150 120 90 90 90 90 90 210 180 150 120 120 120 90 90 pus EE 240 210 180 150 150 120 120 120 m 5705 240 210 180 180 150 150 150 The 8th DIP SWITCH key allows to make a rapid check up of the P C BOARD output connections compressor water pump fan motor water inlet and hot gas solenoid valves energizing them in rapid sequence 2 seconds one by one DURING THE AUTOMATIC OPERATION OF THE ICE MAKER THIS KEY MUST SET IN OFF POSITION ATTENTION The check up of the P C BOARD output must be performed in avery short time order to avoid frequent start and stop every few seconds of the electrical components which may damage them especially the compressor The 9th key allows the operation of the water pump even during the defrost cycle as reguired in the unit eguipped by the rotating spray bar to accelerate the release of the ice cubes The 10th key is not used on the Modular Cuber MC 1210 G WATER SPRAY BAR 4 per unit On Modular Cuber the spray bar is self rotating being propelled by a stream of
21. Grab the spray bar center and lift it up off the jet bearing hub together with its race washer then draw it out through the ice opening 5 To install the replacement spray bar follow above steps in reverse O REPLACEMENT OF DRIER 1 Remove the upper and lower center front panels 2 On air cooled version ulloose the screws securing the condenser to unit frame 3 Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it 4 Unsolder the refrigerant lines from the two ends of the drier 5 install the replacement drier remove factory seals and solder the refrigerant lines hate precautions to NOT OVERHEAT the drier ody 6 Thoroughly evacuate the system to remove moisture and non condensable after drier replacement 7 Charge the system with refrigerant HP 81 by weight see data plate of machine and check for leaks ATTENTION SUVA HP 81 as it is a blend of different type of refrigerants it has to be charged only in the liquid phase 8 Replace panels previously removed P REPLACEMENT OF HOT GAS VALVE BODY 1 Follow the steps in procedures J to remove the hot gas valve coil 2 Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it 3 Unsolder the refrigerant lines from the hot gas valve body and remove it from the unit NOTE Always install a replacement drier whenever the sealed refrigeration system is open
22. NG VALVE WATER COOLED MODELS 1 Remove the rear central panel 2 Close the shut off valve on the water supply line and disconnect it at the rear of the cuber yo Page 27 3 Remove corbin clamp and disconnect the water hose from the outlet of water regulating valve 4 Unloose the nut securing the water regulating valve to the unit frame 5 Recover the refrigerant from the system and transfer itin a bottle so to reclaim or recycle it 6 Trace the water regulating valve capillary tube and unsolder its end from the refrigerant line then remove it from the unit NOTE Always install replacement drier whenever the sealed refrigeration system is open Do not replace the drier until all other repairs or replacements have been completed 7 Toinstallthe replacement evaporator follow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after water regulating valve replacement NOTE The water flow that passes through the valve can be adjusted by means of the valve setting stem U REPLACEMENT OF COMPRESSOR 1 Remove the front center upper and lower panels as well as the rear one 2 Unloosethe screws securing the air cooled condenser to unit frame and open it to gain access to the compressor compartment 3 Remove the cover and disconnect the electrical leads from the compressor junction box 4 Recover the refrigerant from
23. RE SENSORS COMPRESSOR IN OPERATION and the extinguishing of the BIN FULL YELLOW LIGHT EI NOTE The ICE LEVEL CONTROL INFRARED SYSTEM is independent from the temperature however the reliability of its detection can be affected by external light radiations or by any sort of dirt and scale sediment which may deposit directly on the light source and on the receiver To prevent any possible ice maker malfunction due to negative affection of the light detector it is advisable to locate the unit where it is not reached by any direct light beam orlight radiation also itis recommended to keep the bin door constantly closed and to follow the instructions for the periodical cleaning of the light sensor elements as detailed in the MAINTENANCE AND CLEANING PROCEDURES M Remove the refrigerant service gauges if fitted and re fit the unit sevice panels previously removed N Instruct the owner user on the general operation of the ice machine and about the cleaning and care it requires 7 WATER IN VALVE O HOT GAS VALVE tn FAN MOTOR gt ELECTRONIC CARD 15 PRINCIPLE OF OPERATION How it works Inthe SCOTSMAN Modular Cuber MC 1210 the water used to make the ice is kept constantly in circulation by four electric water pumps one for each evaporator which primes it to the nozzles of the self propeller spray bar from where it is
24. SERVICE DIAGNOSIS Page 29 SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION Unit will not run No warning LEDS glows Green LED Power ON glows Bin full LED glows Red alarm LED glows Red alarm LED blinks Blown fuse in P C Board Incorrect contact of fuse in P C B Main switch in OFF position inoperative P C Board Loose electrical connections P C Board selector in STAND BY Inoperative ice level control High head pressure Lo power cable in contact with frame Too high evaporating temperature Replace fuse amp check for cause of blown fuse Check grip of the fuse holders Turn switch to ON position Replace P C Board Check wiring Connector Move to OPERATING position Replace ice level control Dirty condenser Clean Inoperative fan motor Replace Check and repair or replace Check for shortage of refrigerant or for leaking of hot gas valve Compressor cycles intermittently Cubes too small Cloudy cubes Shortage of water Low voltage Contactor with burnt contacts Non condensable gas in system Compressor starting device with Freezing cycle too short Capillary tube partially restricted Moisture in the system Shortage of water Shortage of refrigerant Inoperative evaporator sensor Shortage of water Dirty water supply Accumulated impurities Spray bar not rotating Check circuit for overloading Check voltage at the supply t
25. SSOR WATER PUMPS e EVAPORATOR e MoO 2L 7 te v CONDENSER sae BLA ps5 i AMBIENT EL er Wis m m 58 osa x L tc H e E 13 WATER INLET SOLENOID VALVES HOT GAS VALVES WATER DRAIN SOLENOID VALVES for the first 15 20 seconds NOTE The length of the defrost cycle is determined by the DIP SWITCH keys setting in conjunction with the ambient temperature sensor located just in front of the condenser The length of defrost cycle can be adjusted by changing the combination setting of keys 5 6 and 7 of DIP SWITCH illustrated on Table C of PRINCIPLE OF OPERATION As shown per each individual keys combination it is possible to have a different length of the defrost cycle in relation to the different ambient temperature situations shorter when the ambient temperature is high and longer in colder ambients to partially compensate the length of the freezing cycle which is longer in high ambient temperatures and shorter in low ones J Check during the defrost cycle that the incoming water flows correctly into sump reservoir in order to refill it and that the surplus overflows through the overflow drain tube K Check the texture ofice cubes just released They have to be in the right shape with a small depression of about 5 6 mm in their crown If not wait for the completion of the second cycle before per
26. by the water regulating valve at 16 bars 225 psig However suction pressure and compressor amps will still decline as the machine freezes ice Freeze Cycle Average Discharge Pressure A C 15 16 bars 210 225 psig Average Discharge Pressure W C 16 bars 225 psig Suction Pressure End Freeze Cycle 1 5 bar 21 psig 0 8 4 0 b r Harvest Cycle Average Discharge Pressure 7 14 bars 100 195 psig Average Suction Pressure 4 7 bars 55 100 psig REFRIGERANT CHARGE SUVA HP 81 Air amp Water Cooled Version MC 1210 25000 grams 70 oz NOTE Before charging the refrigerant system always check the type of refrigerant and quantity as specified on the individual ice machine dataplate The refrigerant charges indicated are related to average operating conditions WARNING As SUVA HP 81 is a bland of different types of refrigerants it is impera tive to charge the system only in liquid phase in order to avoid to alter their mix up percentage Page 19 COMPONENTS DESCRIPTION A EVAPORATOR TEMPERATURE SENSOR The evaporator temperature sensor probe located in contactwith the evaporator serpentine detects the dropping of the evaporator tempera ture during the freezing cycle and signals it by supplying a current flow to the micro processor of P C BOARD According to the current received the evaporator sensor supplies power to the P C BOARD first whenitreachs 0 C 32 F secon
27. 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 defrost 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 NOTE The length of the defrost cycle factory set can vary in accordance with the actual ambient temperature as shown on Table C For instance in high ambient temperature situation it can be reduced to recover some of the time spent for the longer freezing cycle At the end of the defrost cycle both the hot gas and the water inlet valves close so the machine initiates another freezing cycle OPERATION CONTROL SEQUENCE At the start of the freezing cycle the evaporator temperature sensor controls the length of the first part of the freezing cycle As it reaches a predetermined temperature it supplies a low voltage current to the P C BOARD in order to activate the electronic timer which takes over the control of the freezing cycle for a pre fixed time according to the DIP SWITCH keys setting see Tab B NOTE The evaporator temperature sensor factory pre set is the same for all the models and is not adjustable in the field Once completed the freezing cycle 2nd phase the system goes automatically into the defrost cycle
28. crew the terminal wires holders of the electronic timer and disconnect the wires 3 Remove by pulling out its holding ring the electronic timer from its bracket 4 install the replacement electronic timer follow previous steps in reverse NOTE Adjust the electronic timer knob in order that all remaing water from previous freezing cycle be totally pumped out from the sump tank M REPLACEMENT OF FAN MOTOR 1 Remove the front upper and lower panels 2 Unloosethe screws securing the air cooled condenser to the unit frame and open it to gain the access to the fan motor 3 Remove screws and yellow green ground wire Trace the electrical leads of fan motor and disconnect them 4 Remove the bolts securing the fan motor protection grid to the condenser shroud then remove the fan motor assembly 5 With an appropriate allen wrench unsoolse the screw securing the fan blade to the fan motor shaft then unloose the nuts holding the fan motor to its protecting grid 6 To install the replacement fan motor follow the above steps in reverse NOTE When installing a new fan motor check that the fan blades do not touch any surfaces and move freely 26 REPLACEMENT OF SPRAY BAR 1 Remove the front right or left side panel and then the plastic ice chute 2 Reach through the ice opening and feel for the spray bar 3 Rotate spray bar so that one of its end is aligned with ice opening 4
29. d at 15 C 5 F in this second case it supply power to the electronic timer built into the P C BOARD so that it may take contro of the length of the 2nd phase of freezing cycle The length of the timed phase is pre fixed by the setting of the keys 1 2 3 and 4 of the DIP SWITCH The activation of the electronic timer 15 C 5 F is monitored by the lighting up of the RED LED placed in the front of the P C BOARD This lighting up occures usually in the mid period of the freezing cycle and signals the switching from the first to the second phase of the freezing cycle B CONDENSER TEMPERATURE 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 temperature variations and signals them by supplying current at low voltage to the P C BOARD in the air cooled versions in relation to the different current received the micro processor of the P C BOARD supplies through a TRIAC the power at high voltage to the fan motor so to cool the condenser and to reduce its temperature In case the condenser temperature rises and reaches 75 C 170 F the current arriving to the micro processor is such to cause an immediate and total stop of the machine operation C AMBIENT TEMPERATURE SENSOR The probe of this sensor located in the front of the ice maker condenser Air cooled version and on the water suppl
30. e fitting of the condenser water drain utilizing a second flexible tubing or a 3 8 O D copper tubing 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 cases 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 109 50 F even in winter months 2 there at least a 15 cm 6 clearance around the unit for proper air circulation 3 Are the storage bin and the unit in level IMPORTANT 4 Have all the electrical and plumbing connections been made and is the water supply shut off valve open 5 Has the voltage been tested and checked against the data plate rating 6 Has the water supply pressure been checked to ensure a water pressure of at least 1 bar 14 psi 7 Check all refrigerant lines and conduit lines to guard against vibrations and possible failure 8 Havethe 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 Page 9 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
31. e specifications and the step by step procedures for the installation start up and operation maintenance and cleaning for the SCOTSMAN MODULAR CUBER MC 1210 The Electronic Modular Cubers of the MC 1210 series 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 This product qualifies for the following listings 25 These icemakers have been engineered to our own rigid safety and performence standards The VDE SEV WRC seals signify that they are listed with them and that they comply with the materials and manufacturing standard of them These seals also signify that these icemaker models have been inspected and tested by VDE SEV WRC inspectors who reserve the right to periodically examine production icemakers at the factory to assure continued compliance NOTE To retain the safety and performance built into this icemaker it is important that installation and maintenance be conducted in the manner outlined in this manual Storage Bin Since the MC 1210 Modular Cuber do not have their own attached ice storage bin itis necessary to use the Bin B 120 B UNPACKING AND INSPECTION Modular Cuber 1 Gallyourauth rized 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 deliverin
32. eck of the clarity of ice cubes and visual inspection of the water spraying parts before and after cleaning will indicate frequency and procedure to be followed in local areas 5 Withtheice machine and fan motor OFF on air cooled models clean condenser using vacuum cleaner whisk broom or non metallic brush taking care to do not damage both the condenser and ambient temperature sensor probes 6 Check for water leaks and tighten drain line connections Pour water down through the storage bin drain line to be sure that drain line is open and clear 7 Check size condition and texture of ice cubes Perform adjustment of DIP SWITCH keys if required 8 Check the ice level contro sensor to test shut off Put your hand between the light source and the receiver so to cut off the light beam for at least one minutes This should cause the ice maker to shut off and the light up of the 2nd LED yellow light IMPORTANT Perform the above check only at the end of harvest cycle or at the beginning of freezing cycle in order to do not cause to the unit to make a double freezing cycle NOTE Within few seconds after the removal of the hand from the Infrared sensing light the icemaker restarts in freezing cycle The ice level control uses devices that sense light therefore they must be kept clean enough so they can see Every month clean wipe the sensing eyes with a clean soft cloth 32 9
33. eplacement of water cooled condenser Replacement of water regulating valve water cooled models Replacement of compressor Wiring diagram Service diagnosis MAINTENANCE AND CLEANING INSTRUCTIONS General lcemaker Cleaning instructions of water system Page 1 O co 0 043004 R A 10 11 Page 2 SPECIFICATIONS amp ELECTRONIC CUBER MODEL MC 1210 Important operating reguirements MIN MAX eee Air temperature 10 C 50 F 40 C 100 F Bee Water temperature 5 C 40 F 40 C 100 F Bez Water pressure 1 bar 14 psi 5 bars 70 psi Electr voltage variations vH 2222 22 from voltage rating L 2222 22 specified on nameplate 10 6 Ss 22 AIR COOLED MODELS WATER COOLED MODELS Kg er s 700 amp 2 v I T r ow T amp 2 amp 5 E go a m S 8 550 a E A H o o 500 a amp g o S lt lt 400 38 32 27 21 15 10 5 WATER TEMPERATURE WATER TEMPERATURE NOTE The daily ice making capacity is directly related to the condenser air inlet temperature water temperature and age of the machine To keep your SCOTSMAN MODULAR CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on page 37 of this manual Production charts shown are indicating the production and MCL models For MCS models t ice production is approx 10 lower
34. forming any adjustment CONTACTOR COIL Ein raot H M FAN MOTOR r O ROON P WATER PUMP kri prssej Page 14 If required the length of the timed freezing cycle can be modified by changing the DIP SWITCH keys setting as illustrated in OPERATING PRINCIPLE If the ice cubes are shallow and cloudy it is possible that the ice maker runs short of water during the freezing cycle second phase or the quality of the supplied water requires the use of an appropriate water filter or conditioner or the installation of the optional water drain valve kit KWD L To be sure of the correct operation of ice level control device place one hand between its sensing eyes to interrupt the light beam The RED LIGHT located in the front of the P C BOARD goes immediately OFF and after 60 seconds the unit stops with the simultaneous glowing of the 2nd YELLOW LIGHT to monitor the BIN FULL situation Fig 6 Take the hand out from the ice level control sensors to allow the resumption of the light beam the RED LIGHT located in the front of the P C BOARD will glow immediately After approximately 6 seconds the ice maker resume its operation with the immediate glowing ofthe FOURTH YELLOW LIGHT indicating UNIT MN EVAPORATOR LZ 0 v PL CONDENSER LLAMO gt AMBIEN BIN TEMPERATU
35. g carrier and a concealed damage claim form filled in subjet to inspection of the contents with the carriers representative present 3 a Cutandremove the plastic strip securing the carton box to the skid b Remove the packing nails securing the carton box to the skid c Cutopen the top of the carton and remove the polystyre protection sheet d Pull out the polystyre posts from the corners and then remove the carton 4 Remove top and all side panels of the unit and inspect for any concealed damage Notify carrier of your claim for the concealed damage as stated in step 2 above 5 Remove all internal support packing and masking tape and the hardware package 6 Check that refrigerant lines do not rub against or touch other lines or surfaces and that the fan blade moves freely 7 Check that the compressor fits snugly onto all its mounting pads 8 See data plate on the rear side of the unit and check that local main voltage corresponds with the voltage specified on it CAUTION Incorrect voltage supplied to the icemaker will void your parts replacement program 9 Remove the manufacturer s registration card from the inside of the User Manual and fill in all parts including Model and Serial Number taken from the data plate Forward the completed self addressed registration card to Frimont factory Storage Bin B 120 1 Follow the steps 1 2 and 3 above to unpack the storage bin 2 Carefully
36. gh the round hole provided into the base of the Electronic Modular Cuber Upper unit 9 Connect the electric plug of the ice level control cable to the Cable Extension then plug in this one into its BOARD socket 10 Rotate clockwise the TRIMMER setting screw located in the front of P C BOARD to its maximum power so to compensate the greater resistence caused by the Cable Extension addition NOTE Replace the existing ice deflector bulb holder combination with the new longer part number 660498 01 to prevent the light beam of the Ice Level Control from interferring with it 11 Stick with accuracy the rubber stripe onto the upper edge of the front panels of the lower unit in order to fill the air gap between the two machines 12 Place again in their position the ice chutes and finally re fit all the service panels previously removed Electronic units installation 1 Unloose the screws and remove the top panels 2 Put the second Electronic Modular Cuber onto the bottom one and aligne the two cabinets correctly 3 Remove the ice chutes from both the units and insert through the ice discharge openings of the upper unit the plastic reinforced Ice Chute Connections 4 Disconnect the ice level control terminal plug from the P C Board of the upper Electronic Modular Cuber now colled unit 2 5 Secure the Interface P C Board to the contactor metal bracket of the lower un
37. he rear side of the control box and remove it from its socketby carefully pulling outthe terminal plug securing clip 4 install the replacement ambient sensor follow the above steps in reverse NOTE Both the condenser and ambient sensors are equipped by the same terminal plug and socket To avoid confusion on their installation it must be observed that the condenser sensor terminal plug and its corresponding socket are of different colour compared to the other ones E REPLACEMENT OF ICE LEVEL LIGHT CONTROL 1 Remove the front center upper panel and front left or right panel according to the location of the ice level control 2 Trace the ice level light control terminal plug the only one with four terminal pins on the rear side of the control box and remove it from its socket by carefully pulling out the terminal plug securing clip 3 Remove the ice chute where is located the ice level light control assy and remove it from its metal bracket by unloosing the two securing screws 4 Remove the PVC plastic plug from unit base then withdraw the entire ice level light control cable and terminal plug through the hole in the unit base 5 install the replacement ice level light control follow the above steps in reverse NOTE Slip in the ice level control cable in the center of the plastic plug so to avoid any sort of contact with the unit frame F REPLACEMENT OF P C BOARD 1 Remove front center
38. he unit returns under power after having been switched off both the water inlet valve and the hot gas valve get energized for a period of 5 minutes thus to admit new water to the machine sump reservoir to fill it up and eventually to wash off any dirt that can have deposited in it during the unit off period Fig 1 D During the water filling operation check to see that the incoming water dribbles through the evaporator platen dribbler holes down into the sump reservoir to fill it up and also that the incoming surplus of water flows out through the overflow pipe into the drain line During the water filling phase the components energized are WATER INLET SOLENOID VALVES HOT GAS SOLENOID VALVES WATER DRAIN SOLENOID VALVES for the first 15 20 seconds EVAPORATOR BIN TEMPERATURE SENSORS COMPRESSOR ELECTRONIC CARD APPS NOTE If in the 5 minutes length of the water filling phase the machine sump reservoir does not get filled with water up to the rim of the overflow pipe it is advisable to check 1 The water pressure of the water supply line that must be at least 1 bar 14 psig Minimum Max 5 bar 70 psig 2 The filtering device installed in the water line that may reduce the water pressure below the Minimum value of 1 bar 14 psig 3 Any clogging situation in the water circuit like the inlet water strainer and or the flow control Page 11 NOTE On a
39. igerant Capillary tube partially restricted Hot gas solenoid valve leaking Undercharge of refrigerant Spray bar not rotating Discharge head pressure too high Too short defrost time Restriction in incoming water line Water inlet valve not opening Hot gas valve orifice restricted Air vented holes in mold cups plugged Discharge head pressure too low Replace Repair or replace Recover refrig add new gas amp drier after evacuating the system Relocate the unit or provide for more ventilation Correct the charge Purge off slowly Recover refrig add new gas amp drier after evacuating the system Replace valve Charge to data plate indication Remove spray bar amp jet bearing and clean them See incorrect discharge pressure Check amp adjust DIP SWITCH keys 5 6 7 Check water valve strainer and flow control If necessary enlarge the flow control orifice Valve coil with open winding Replace valve Replace hot gas valve assy Clean out holes See incorrect discharge pressure Inoperative P C Board Hot gas valve not opening Water solenoid valve not opening Incorrect discharge pressure Inoperative condenser sensor Inoperative P C Board Water regulating valve misadjusted Excessive water in unit base Water tubing leaking Replace P C Board Valve coil with open winding Replace valve Valve coil with open winding Replace valve Replace
40. ing phase 5 minutes the unit passes automatically into the freezing cycle with the start up of COMPRESSOR WATER PUMPS FAN MOTOR air cooled version controlled by the condensing temperature sensor located within the condenser fins Fig 2 OPERATIONAL CHECKS F Install if necessary the refrigerant service auges on both the high side and low side chr der valves to check the compressor head and suction pressures WATER IN VALVE 7 EVAPORATOR 0 Vise CONDENSER Is HOT e VALVE E s 1 O E 10 ELECTR a Ei AMBIENT CZ CONTACTOR COIL Nghe E ES COMPRESSOR ELECTRONIC CARD Page 12 Check to see through the discharge opening that the self propelled spray bar is correctly rotating and that the water jets evenly reach the interior of the inverted mold cups also make sure that there is not excessive water spilling out through the opening H Theice making process takes place thereby with the water sprayed into the molds that gets gradually refrigerated by the heat exchange with the refrigerant flowing into the evaporator serpentine During the freezing process when the evaporator a o EVAPORATOR BIN TEMPERATURE SENSORS om Bew H TRANSF COMPRESSOR NZ WATER VALVE Dj ELECTRONIC
41. inlet solenoid valve follow the above steps in reverse I REMOVE THE FLOW CONTROL 1 Remove the rear center panel 2 Locate the plastic hose connecting the water inlet solenoid valve to the copper water line going to the top of the evaporator chamber 3 Unloosethetwoclamps securing the copper tube as well as the flow control to the plastic hose and withdraw the copper tube 4 Bymeansofa4MA screw withdraw the flow control assy from the inside of plastic hose J REPLACEMENT OF THE HOT GAS VALVE COIL 1 Removethefrontand the top center panel 2 Removethe hardware securing the hot gas valve coil to its body 3 Trace the electric wires belonging to the hot gas valve coil and disconnect them then lift the valve coil from the valve body 4 Toinstallthe replacement hot gas valve coil follow previous steps in reverse REPLACEMENT OF WATER DRAIN SOLENOID VALVE 1 Remove the rear panel 2 Trace and disconnect the electrical leads from the water drain solenoid valve coil Page 25 3 Remove the corbin clamps and the plastic hoses from the valve 4 Unloose the screws securing the valve to the unit base and remove it 5 install the replacement water drain solenoid valve follow the above steps in reverse NOTE When installing the new valve pay attention to the water flow direction L REPLACEMENT OR THE WATER DRAIN ELECTRONIC TIMER 1 Remove the front upper and lower panels 2 Uns
42. ir cooled models the condenser temperature sensor which is located within the condenser fins keep the head eo ressure between 15 and 16 ars 210 225 psig In the water cooled models the discharge E is constant at the value of 16 bars 225 psig by means of the water regulating valve located on the water supply line to the condenser Incase of condenser clogging such to prevent the proper flow of the cooling air or fan motor out of operation the condenser rises and when it reaches 75 C 170 F the condenser temperature sensor shuts off the ice maker with the consequent light up of the RED WARNING LIGHT Fig 3 The same happen even for the water cooled version where the condenser probe is placed in contact with the refrigerant liquid line When its temperature reaches 75 C 170 F it trips off automatically the machine After having diagnosed the reason of the rise of temperature and removed its cause it is necessary to turn the head of the selector always using an_appropriate scewdriver first on the RE SET position then return it on previous OPERATION position thus to put the machine condition to initiate a new freezing cycle The same can also be done by just switching OFF and ON the unit at main line switch In both cases the machine restarts with the usual 5 minutes water filling phase in order to provide enough water into the sump tank E At completion of the water fill
43. it now called unit 1 by means of the supplied plastic clamp 6 Disconnect the ice level control terminal plugfromthe P C Board ofthe unit 1 and connect itto the INLET socket of the Interface P C Board shorter wire 7 Gonnectthe primary OUTLET terminal plug of the Interface P C Board wire of medium lenght to the P C Board socket of the unit 1 Page 7 8 Connect the secondary OUTLET plug longer wire of the Interface P C Board to the P C Board socket of the unit 2 see drawing 9 Turn clockwise to its max power the TRIMMER setting screw located on the front center of P C Board ofthe ice level control of the unit 2 10 The Interface P C Board is now ready to stop simultaneously the operation of the two units when the infrared beam of the ice level control is interrumped by the stored ice cubes ATTENTION After removal of the ice cubes to re establish the infrared beam both units resume their operation starting from the beginning of freezing cycle During the first freezing cycle it could be possible that the ice cubes produced by one of the two ice makers be not of the correct shape cloudy and shallow due to an insufficient water level in its sump tank This minor problem will desappear in the next batch because in the coming harvest cycle the sump tank will be properly filled up Page 8 11 Stick with accuracy the rubber stripe onto the upper edge of the front panels of the lower
44. n the factory DIP SWITCH KEYS FACTORY SETTING COMBINATIONS DIP SWITCH ON MCL 1210 OFF 1210 OF 16 HOT GAS VALVE EVAPORATOR EVAPORATOR SPRAY BAR _ Nal DRAIN LINE The electrical components in operation during the freezing cycle are COMPRESSOR FAN MOTOR in air cooled version WATER PUMPS CONTACTOR COIL and during the second phase of freezing cycle Time mode they are joined by the ELECTRONIC TIMER The refrigerant head pressure in the course of the freezing cycle ranges between 15 and 16 bars 210 225 psig being controlled by the tem perature sensor probe located within the condenser fins air cooled version or it is kept constant at 16 bars 225 psig by means of the water regulating valve water cooled version On the air cooled version the condenser tempe rature sensor when senses a rising of the condenser temperature beyond the pre fixed limit changes its electrical resistance and send a low voltage power flow to the Micro Processor of P C BOARD which in turn energizes through a TRIAC the FAN MOTOR When the opposite situation occures i e the condenser temperature gets below the pre fixed limit the temperature sensor changes again its electrical resistance reducing therefore the current flow to the P C BOARD to cause the fan motor to temporary cut off NOTE In case the condenser
45. o the building If low contact the power company Clean or replace Purge the system Check for loose wires in starting loose wiresdevice Review setting of DIP SWITCH keys Recover refrig add new gas amp drier after evacuating the system Same as above See remedies for shortage of water Check for leaks amp recharge Replace sensor See remedies for shortage of water Use water softner or water filter Use SCOTSMAN Ice Machine cleaner Remove spray bar amp jet bearing and clean them Water solenoid valve not opening Water leak in sump area Water flow control plugged Too lo water inlet pressure Replace valve Locate and repair Remove and clean Min water inlet pressure must be 1 bar Page 30 SERVICE DIAGNOSIS SYMPTOM POSSIBLE CAUSE Irregular cubes size amp some cloudy Some jets plugged Cubes too large Decreased ice capacity Poor harvest SUGGESTED CORRECTION Shortage of water Unit not level Spray bar not rotating Remove spray bar amp jet bearing and clean them See shortage of water Level as required Remove spray bar amp jet bearing and clean them Freezing cycle too long Review setting of DIP SWITCH keys Unit won t harvest Inefficient compressor Leaky water valve Non condensable gas in system Poor air circulation or excessive hot location Red alarm LED glows Overcharge of refr
46. oil P C Board Relay 2 amp 3 Coil h Water Pumps meme Contactor Electronic Timer tanentenn 2 Electronic Controls amp Sensors ON OFF Evaporator Sensor Condenser Sensor m Ambient Sensor Level Control HARVEST Electrical components Loads ON OFF Compressor 0 lt Fan Motor Air cooled only and TRIAC Hot Gas Valves Inlet Water Valves 7 P C Board Relay 1 amp 2 Coil ig P C Board Relay 3 lt Water pumps emm Contactor Coil Electronic Timer Electronic Controls amp Sensors ON OFF Evaporator Sensor Condenser Sensor Ambient Sensor Level Control bs OPERATING CHARACTERISTICS On air cooled models during the freezing cycle the discharge pressure is kept between 15 and 16 bars 210225 psig by the condenser tempe rature sensor and at the same time the suction pressure will gradually decline reaching its lowest point just before harvest Compressor amps experience a similar drop On water cooled the discharge pressure is constant maintained during the freeze cycle
47. on of the ice maker unit Water containing excessive minerals will tend to produce cloudy coloured ice cubes plus scale build up on parts of the water system Water supply Connect the 3 4 male fitting of the solenoid water inlet valve using an approved food grade flexible tube or a 3 8 O D copper pipe 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 installation of an appropriate water filter or conditioner Water supply Water cooled models The water cooled versions of SCOTSMAN Ice Makers require two separate inlet water supplies one for the water sprayed for making the ice cubes and the other for the water cooled condenser Connect the 3 4 male fitting of the water inlet using flexible tubing or a 3 8 O D copper pipe 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 Water drain The recommended drain tube is a plastic or flexible tube with 18 mm 3 4 I D which runs to an open trapped and vented drain When the drain is along run allow 3 cm pitch per meter 1 4 pitch per foot A ventatthe unit drain connection is also required for proper sump drainage Water drain Water cooled models Connect the 3 4 mal
48. rolled by the P C BOARD in order to close or open the electrical circuit to the compressor O WATER DRAIN SOLENOID VALVE Energized by a special electronic timer during the first 15 20 seconds of defrost cycle it diverts to the drain from the sump tank all the remaining water rich of minerals left from the previous freezing cycle which is pumped out by the water pump P WATER DRAIN ELECTRONIC TIMER Located beside the contactor it energizes the water drain valve for the first 15 20 seconds of the defrost cycle according to the setting of its knob NOTE Adjust the knob of the water drain electronic timer in order that all remaining water of previous freezing cycle be pumped out from the sump tank 23 ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES A ADJUSTMENT OF THE CUBE SIZE CAUTION Before performing actual adjustment of the cube size check other possible causes for cube size problems refer to the Service Diagnosis Section for problem review and analysis Do not perform any adjustment till the icemaking system has progressed through several complete freezing and harvest cycles to observe size and quality of ice cubes and whether or not the cube size problem exists I Ifthe cubes are shallow size Indentation is too deep probably the length of the second phase of the freezing cycle is too short so to extend such length you have to 1 Locate the DIP SWITCH on the
49. rough the micro processor of BOARD during the defrost cycle and as well during the water filling phase 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 the compressor to flow directly into the evaporator serpentine to defrost the formed ice cubes K FAN MOTOR Air cooled version The fan motor is controlled through the P C BOARD and the TRIAC by the condenser tem perature sensor Normally itoperates only during the freezing cycle to draw cooling air through the condenser fins In the second part of the freezing cycle the fan motor can run at intermittance as the condenser pressure must be kept between two corresponding head pressure values 15 16 bars 210 225 psig L COMPRESSOR The hermetic compressor is the heart of the refrigerant system and it is used to circulate and retrieve the refrigerant throughout the entre system It compresses the low pressure refrigerant vapor causing its temperature to rise and become high pressure hot vapor which is then released through the discharge valve M WATER REGULATING VALVE Water cooled version This valve controls the head pressure in the refrigerant system by regulating the flow of water going to the condenser As pressure increases the water regulating val ve opens to increase the flow of cooling water N CONTACTOR Placed outside of the control box it is cont
50. sensor Replace P C Board Adjust its setting stem Check Tighten or replace 31 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 conditions and the ice volume produced and each icemaker must be maintened individually in accordance with its particular location requirements 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 Clean the water system evaporators bin and spray bars using a solution of SCOTSMAN Ice Machine Cleaner Refer to procedure C cleaning instructions and after cleaning will indicate frequency and proce dure to be followed in local areas 4 Reach the water spray bar from the inside of the freezing chambers lifting it from its seat with its bottom race washer Dip it into a tray filled with cleaning solution then rinse it under a tap water stream With a pick clean the orifice of the water stream jet that propelis the spray bar NOTE Cleaning requirements vary according to the local water conditions and individual user operation Continuous ch
51. temperature probe senses that the condenser temperature has rised to 75 C 170 F for one of the following abnormal reasons CLOGGED CONDENSER Air cooled version FAN MOTOR OUT OF OPERATION Air cooled version INSUFFICIENT FLOW OF COOLING WATER Water cooled version AMBIENT TEMPERATURE HIGHER THEN 40 C 100 F itcauses the total andimmediate SHUT OFF of the machine in order to prevent the unit from operating in abnormal and dangerous conditions When the ice maker stops on account of this protective device there is a simultaneous glowing of the RED LED warning the user of the Hi Temperature situation After having eliminated the source of the condenser hi temperature to restart the machine it is necessary first to rotate for a while the program selector on RE SET position then to rotate it again on OPERATION position The same can be done by just switching OFF and ON the unit at main line switch The ice machine resumes its normal operation by going through the 5 minutes water filling phase Page 17 At the start of the freezing cycle the refrigerant suction or lo pressure lowers rapidly to 3 3 bars 45 psig then it declines gradually in relation with the growing of the ice thickness to reach at the end of the cycle approx 1 bar 14 psig with the cubes fully formed in the cup molds The total length of the freezing cycle ranges from 20 to 25 minutes DEFROST OR HARVEST CYCLE Fig C
52. th the left to right and front to rear directions by means of the adjustable legs 3 Inspectthe Storage Bin top mounting gasket which should be flat with no wrinkles to provide a good sealing when the Modular Cuber is installed on top of it 4 Place the Modular Cuber on top of Storage bin using care not to wrinkle or tear the gasket 5 Lifta little bit the Modular Cuber front side in order to be able to mount in one of the two ice chute openings the ice level control bracket 6 Remove the PVC plastic plug closing the round hole located beside the ice chute opening 7 Trace the ice level control assy secured for the transport on to the top of the evavorator of the Modular Cuber and direct it down through the unplugged round hole into the Storage Bin 8 Secure the ice level control assy on its bracket by means of the two screws found in the hardware package supplied with the unit 9 Make acut shear in the PVC plastic plug that goes from its edge to the center insert the ice level contro cable in the center of the plastic plug so to prevent it from any sort of contact with the unit frame then place again the PVC plug in the round hole keeping the cable exceeding portion inside the unit Page 5 10 Install the two plastic ice cube deflectors by hooking them on the flange of the ice chute openings in unit base see illustration D STACKING INSTALLATION A Stacking Kit KSC 1210 is available as an accessory on
53. the cycle first portion When the temperature of the evaporator serpentine drops to apre set value the evaporator sensor probe changes its electrical resistance allowing a low voltage current 8 10 volts to flow to the P C BOARD which in turn activates an electronic timer The timer which is built in the P C BOARD takes over from the evaporator temperature sensor the control of the freezing cycle up to its completion NOTE The change of the electric potential of the evaporator sensor with the consequent activation of the timer Time mode is signalled by the glowing up of the RED LED located in the front of the P C BOARD ATTENTION In case after 15 minutes from the beginning of the freezing cycle the temperature of the evaporator sensor probe is higher then 0 C 32 F shortage of refrigerant inoperative hot gas valve etc the P C BOARD switch OFF immediately the unit with the simultaneuos blinking of the WARNING RED LED The length of this second portion of the freezing cycle is pre fixed and related to the setting of the first four DIP SWITCH keys which is made in relation with the different unit versions In Table B are indicated the various lengths of the second portion of freezing cycle Time mode in relation to the different combinations of the DIP SWITCH KEYS In Table A herebelow are illustrated the DIP SWITCH keys combinations for the different unit versions as they are set i
54. the system and transfer it in a bottle so to reclaim or recycle it 5 Unsolder and disconnect both the suction line and the discharge line from the compressor 6 Removethefourcompressor mounting bolts and the compressor from the unit base NOTE Always install a replacement drier whenever the sealed refrigeration system is open Do not replace the drier until all other repairs or replacements have been completed 7 Toinstallthe replacementcompressorfollow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after compressor replacement Page 28 WIRING DIAGRAM AIR AND WATER COOLED 220 50 60 3 380 50 3 N B WHITE G GREY N BLACK A BLUE M BROWN GV YELLOW GREEN PRINTED CIRCUIT BOARD RINSING FREEZER OPER TOO HIGH TEMPERATURE BIN FULL POWER ON RESET TOO HIGH TEMP TERMINAL BOARD FREEZING OPER STAND BY RINSING ETT lk LI 1 ele L3 CONTACTOR 1 1 SSOR z 1 COMPRE bo P gt Q E lt F a CONDENSER TEMP AMBIENT TEMP SOLENOID VALVE GAS SOLENOID VALVE H20 ii W SENSORS MC 1210 N 4 WATER PUMP ON MC 1210 N 2 HOT GAS WATER SOL VALVES DHIHHHI CONNECTION REPLACES NEUTRAL FOR MODEL 220 50 60 3 k
55. the system and transfer it in a bottle so to reclaim or recycle it 5 Unsolder the refrigerant lines from the condenser and remove it from the unit NOTE Always install a replacement drier whenever the sealed refrigeration system is open Do not replace the drier until all other repairs or replacements have been completed 6 Toinstallthe replacement condenser follow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after condenser replacement S REPLACEMENT OF WATER COOLED CONDENSER 1 Remove front central upper and lower panels 2 Remove the condenser and the ambient temperature sensor probes from condenser 3 Remove bolts which secure the condenser to the unit base 4 Remove the corbin clamps and disconnect the plastic hoses from the water cooled condenser 5 Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it 6 Unsolder the refrigerant lines from the condenser and remove it from the unit NOTE Always install a replacement drier whenever the sealed refrigeration system is open Do not replace the drier until all other repairs or replacements have been completed 7 Toinstallthe replacement condenser follow the above steps in reverse NOTE Thoroughly evacuate the system to remove moisture and non condensables after condenser replacement REPLACEMENT OF WATERREGULATI
56. which also has a pre fixed length that can slightly vary depending upon the actual ambient temperature as shown in Table C Atcompletion of the defrost cycle the P C BOARD UL EE the unit to start again a new freezing cycle OPERATION ELECTRICAL SEQUENCE The following charts illustrate which switches and which components are ON or OFF during a particular phase of the icemaking cycle Refer to the wiring diagram for a reference Remember the wiring diagram shows the unitas it is in the Timed Freeze Cycle BEGINNING FREEZE Electrical components Loads ON OFF Compressor enee n Fan Motor Air cooled only and TRIAC Hot Gas Valves eA MM Inlet Water 4 2 P C Board Relay 1 P C Board Relay 2 amp 3 Coil Water Pumps Contactor Electronic Timer Electronic Controls amp Sensors ON OFF Evaporator Sensor m Condenser Sensor Ambient Sensor Level Control M TIMED FREEZE Electrical components Loads ON OFF Compressor 4 Fan Motor Air cooled only and TRIAC e Hot Gas 4 4 Inlet Water P C Board Relay 1 C
57. y line to the condenser Water cooled version has the function to detect the ambient or the water temperature and by changing its own electrical resistance supplies a different current flow to the P C BOARD This different current flow received by the P C BOARD is elaborated by the micro processor in order to extend or shorten the defrost cycle length longer in cold ambient situations shorter in warm ones Page 20 D ICE BIN LEVEL LIGHT CONTROL The electronic ice bin level control located into the storage bin has the function to stop the operation of the ice machine when the light beam between the light source and the sensor is interrupted by the ice cubes stored into the bin When the light beam is interrupted the RED LED located in the front of the P C BOARD goes off in case the light beam is constantly interrupted for more than 60 seconds the ice machine stops with the glowing up of the 2nd YELLOW LED to monitor the situation of ice bin full The 60 seconds of delay prevent that an ice scoop movementor the ice dropping through the ice chute interrupting for a while the light beam can stop the operation of the unit As soon as the ice is scooped out with the resumption of the light beam between the two infrared sensor of ice level control the RED LED is lighted up and after 6 seconds the ice machine restarts again with the extinguishing of the 2nd YELLOW LED E P C BOARD Data processor The P C BOARD
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