SERVICE MANUAL
Contents
1. SCOTSMAN SERVICE MANUAL TC 150 Electronic counter nugget ice dispenser MS 1000 59 REV 03 2005 TABLE OF CONTENTS Table of contents page Specifications GENERAL INFORMATION AND INSTALLATION Introduction Unpacking and Inspection Location and levelling Electrical connections Water supply and drain connections Final check list OPERATING INSTRUCTIONS Start up Operational checks PRINCIPLE OF OPERATION How it works Water circuit Refrigerant circuit Mechanical system Operating pressures Components description ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES Wiring diagram Service diagnosis MAINTENANCE AND CLEANING INSTRUCTIONS General Icemaker Cleaning instructions of water system Page 2 OO O O1 O1 a O1 11 11 12 13 14 17 19 21 21 21 Page 3 SPECIFICATIONS ELECTRONIC COUNTER NUGGET DISPENSER TC 180 ice making capacity AIR COOLED MODELS Kg C 140 10 130 Y LU E 120 21 cc x E E 110 a a Q 100 a 3 32 E a E O 90 Z Fe 38 z H 80 70 60 32 27 21 15 10 C WATER TEMPERATURE Important operating requirements MIN MAX Air temperature 10 C 50 F 40 C 100 F Water temperature 5 C 40 F 35 C 100 F Water pressure 1 bar 14 psi 5 bars 70 psi Electr voltage variations fromvoltage rating specified on nameplate 10 10 temperature and age of the machine NOTE The daily ice making c2. the freezer auger being linked to it by the ratched coupling NOTE In the event the gear motor will tend to rotate in the wrong direction counter clockwise or not rotating at all the unit will stop immediately with the glowing of the 3RD WARNING YELLOW LED on account of the intervention of the Electromagnetic Safety Device based on Hall Effect principle After having diagnosed and eliminated the source of the failure to restart the unit it is necessary to press the RE SET push button or switch OFF and ON the power line main disconnnect switch Fig 7 The RED LED will start blinking and after 3 minutes the ice maker will resume its total operations by running first the gear motor and then the compressor POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY When the gear motor rotating speed is slowed below 1300 r p m from the normal speed of 1400 r p m the Electromagnetic Safety Device transmits an electrical signal to the MICROPROCESSOR to stop immediately the unit operations like it occures for the wrong rotation with the lighting up of the 3RD YELLOW WARNING LED This to relieve from the excessive load all the electrical and mechanical components of the entire Drive System and extend their durability NOTE After having diagnosed and eliminated the source of the ge
3. after being kept for sometime in shut off conditions electrically disconnected the 2nd RED LED will blink for 3 minutes Fig 1 B Elapsedthe 3 minutes stand by period the unit starts operating with the activation in sequence of the following assemblies GEAR MOTOR COMPRESSOR FAN MOTOR keptunder control by the condenser temperature sensor which has its probe within the condenser fins with the switching off of the 2nd RED LED Fig 2 C Elapsed 2 or 3 minutes from the compressor start up observe that flaker ice begins dropping off the ice spout to fall into the storage bin POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO Hi COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY Page 8 NOTE If after ten minutes from the compressor start up the evaporating tem perature has not dropped down to a value lower than 1 C 30 F the evaporating tem perature sensor detects such an abnormal situation and stops consequently the unit operation Inthis circustance the 3rd warning YELLOW LED will blink Fig 3 After having diagnosed and eliminated the cause of the poor evaporating temperature insufficient refrigerant in t
4. is forced to pass through By undergoing this the ice looses its excess of water content so it drops into the bin in hard dry bits of ice In the ice breaker it is housed the top bearing which is made of two rolls bearings positioned to withstand the auger axial and radial loads This bearing is lubricated with a food grade water resistant grease NOTE It is advisable to check the conditions of both the lubricant grease and the bearings every six months L DRIVE GEAR MOTOR This motoreducer is made of a single phase electric motor with permanent capacitor directly fitted on a gear box The drive motor rotor is kept aligned on its vertical axis by two ball bearings permanently lubricated The gear case contains a train of three spur gears the first one of which is in fiber to limit the noise level All the three gears are encased in case bearings and are covered by lubricant grease MOBILPLEX IP 44 Two seal rings one fitted on the rotor shaft and the other on the output shaft keep the gear case sealed Hovewer the interior can be inspected and serviced by unbolting the two halves of the aluminium gear case housing The gear reducer output shaft is connected to the freezer auger by a ratched coupling which is made of two toothed halves that engages themselves only if turned in the correct direction namely conterclockwise M FAN MOTOR Air cooled version The fan motor is controlled through the P C BOAR
5. sensing eyes located in the ice spout to interrupt the light beam This interruption will cause an immediate extinguishing of the 1st RED LED and after about 6 seconds causes the shutoff of the unit with the simultaneous lighting ofthe 6th YELLOW LED signalling the full bin situation Fig 6 Allow the resumption of the light beam previously interrupted and after about 6 seconds the flaker will resume through the 3 minutes STAND BY period the ice making process with the extinguishing of the YELLOW LED POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY Page 10 NOTE TheICE LEVEL CONTROL INFRA RED SYSTEM is independent of the tempe rature however the reliability of its detection can be affected by 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 follow the instructions for the periodical cleaning of the light sensor elements as detailed in the MAINTENANCE AND CLEANING PRO CEDURES G SETTING OF THE DISPENSING SELEC
6. the freezing cylinder to sorround the stainless steel auger which is vertically fitted in the center of the freezer In the freezer the incoming water gets chilled into soft slush ice which is moved upward by the rotating action of the auger The stainless steel auger that rotates counter clockwise within the freezer is powered by a direct drive gear motor and carries the ice upward along the refrigerated freezer inner walls and by doing so the ice gets progressively thicker and harder ICE SPOUT FLOAT VALVE FLOAT TANK FREEZER WATER FEED LINE Lo66000c0007 WATER INLET LINE The ice being costantly lifted up meet the tooth of the ice breaker which is fitted on the top end of the auger where it gets compacted cracked and forced to change from vertical into horizontal motion to be discharged out through the ice spout into the storage bin By running the ice maker i e by putting the unit under power starts the automatic and continuous icemaking process which would not stop until the ice storage bin gets filled up to the level of the control eyes located on the sides of the ice spout As the ice level raises to interrupt the light beam running between the two infrared lamps the unit stops after six seconds with the simulteneous glowing of the YELLOW LED signalling the Full Bin situation NOTE The interruption of
7. the light beam between the two light sensors is immediately signalled by the extinguishing of the 1st RED LED located on the front of the P C Board After about 6 of steady interruption of the light beam the unit stops and the Full Bin YELLOW LED glows The six seconds of delay prevent the unit from stopping for any undue reason like the momentarily interruption of the light beam caused by the flakes that slides along the ice spout before dropping into the bin As some ice gets scooped out from the storage bin the light beam between the two sensors resumes and immediately the 1st RED LED lights up six seconds later the ice machine restarts the ice making process and the YELLOW LED goes off REFRIGERANT CIRCUIT 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 through the drier filter then it goes all the way through the capillary tube where itlooses some of its pressure sothatits pressure and temperature are lowered Next the refrigerant enters into the evaporator coil wrapped around the freezer inner tube The water being constantly fed at the interior of the freezer inner tube exchange heat with the refrigerant circulating into the evaporator coil this cause the refrigerant to boil off and evapora te thereby it changes from liquid into vapor The vapor refrigerant then passes through the
8. 11 Check that fan blades move freely and are not touching any surfaces 12 Remove the ice spout cover unloose the bolt securing the casting ice sweep and remove it then inspect the top bearing wipe clean of all grease and apply a coating of food grade water proof grease P N 263612 00 NOTE It is recommended to use only food grade and waterproof grease to lubricate the freezer top bearing 13 Turnthe ice dispensing spout and remove it Wash and sanitise it 14 Remove the sink grill for washing and sanitising C CLEANING INSTRUCTIONS OF WATER SYSTEM 1 Switch OFF the Master disconnect switch on the power line 2 Remove the top panel and later the top cover of storage bin with the dispensing drive motor 3 Remove all ice stored in the bin to prevent it from getting contaminated with the cleaning solution Page 22 4 Shut close the water shutoff valve on water line 5 Remove the left side panel to gain access to the water reservoir 6 Remove the float reservoir cover and with a piece of copper wire jump the two water level sensors 7 Remove the right service panel and unloose the drain plug from the water purge tube so to drain out all water from the freezer Then re plug the purge tube CLEANING 8 Prepare the cleaning solution by diluting in a plastic container two liters of warm water 45 50 C with a 0 2 liters of SCOTSMAN Ice Machine Cleaner WARNING The SCOTSMAN Ice Ma
9. ATION 14 Pour into the water reservoir 1 cc approx 20 drops of Scotsman Sanitiser Antialgae P N 264000 02 then switch the unit ON 15 Left the unit running for approx 10 minutes then remove the copper wire used to jump the two sensors for the water level and place back correctly the cover on the float reservoir NOTE DO NOT use ice produced with the sanitising solution 16 With a sponge moisted with a sanitising solution wipe clean all the bin interior surfaces REMEMBER To prevent the accumulation of undesirable bacteria it is necessary to sanitise the interior of the storage bin with an anti algae disinfectant solution every week
10. D and the TRIAC by the condenser tempe rature sensor Normally itoperates to draw cooling air through the condenser fins In cold ambient situation the fan motor can run at intermittance as the condenser pressure must be kept between two corresponding head pressure values N COMPRESSOR The hermetic compressor is the heart of the refrigerant system and it is used to circulate and retrieve the refrigerant throughout the entire system It compresses the low pressure refrigerant vapor causing its temperature to rise and become high pressure hot vapor which is then released through the discharge valve O ICE DISPENSER DRIVE MOTOR Located on the upper side of the storage bin it turn by amilled shaft the dispensing vane placed inside the round storage bin By rotating the dispensing vane pushes the ice towards the bottom rectangular opening so to force the nugget ice to go through the bottom outlet spout P STORAGE BIN Round shaped it is located in the front of the ice machine and has the main reason to store the nugget ice produced by the evaporator till it reaches its maximum level controlled by an infrared optical system Inits bottom is placed the ice spout as well as the water drain hole Inside the ice spout opening is also located the water outlet tube connected to the solenoid val ve Q DISPENSING WATER SOLENOID VALVE Energized and controlled by the PC Board it allows a metered quantity of not chilled water to b
11. DY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY E Check for the correct CUT OUT and CUT IN of the float reservoir water level sen sors by shutoff the valve on the water supply line This will cause a gradual decrease of the water levelin the float reservoir and as soon asthe level gets below the sensors the flaker stops to ope rate and the 5th YELLOW warning LED will glow to signal the shortage of water Fig 5 NOTE The water level sensor detects the presence of sufficient water in the float reservoir and confirms it to the micro processor by maintaining a low voltage current flow between the two sensors using the water as conductor WARNING The use of de mineralized water water with no salt content having an electrical conductivity lower than 30 uS will cause the ability of the water sensors to vanish with the consequent CUT OUT of the flaker operations and the glowing of the YELLOW LED of shortage of water even though that water is indeed in the reservoir Page 9 After this open the water supply line shutoff valve to fill up again the float reservoir the 5th YELLOW LED goes off while the 2nd RED LED starts blinking After 3 minutes the unitresumes its total operation with the immediate start up of the gear motor and 2 seconds later of the compressor F Check for the correct operation of the electronic eye for the ice bin level control by placing one hand between the
12. T BOARD Q O 2 S TOO HI COND 3 STAND BY a T 100mA ai lt Z 3 amp WRONG ROTATION HI EVAP TEMP wW LE FUSE i 4 amp POWER ON 5 amp NO WATER 6 amp BIN FULL I RESET TOO HI TEMP 0 TX in NI N A 3 aa 5 I DL 6 V i GV a gt E g 5 Gv i E af A n ini E O du x n GV GV o E E i ha Hs if if e S a D gt 5 a cc al H lt E U a O E u 2 Z de O zZ U DI E O x i O lt a o w A a x o x a W E zZ lt lt Ly lt o ul lt gt ui a E A gt W o RS L x 5 z SENSORS a D lt W J 050537 03 MOD 003 SERVICE DIAGNOSIS Page 19 SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Unit will not run No LED lighted up 6th Yellow LED glows 5th Yellow LED glows 2nd LED glows 3rd Yellow LED blinks 3rd Yellow LED glows Blown fuse in P C Board Master switch in OFF position Inoperative P C Board Loose electrical connections Inoperative or dirty ice level control Shortage or too soft water High head pressure Too hi evap temperature Shortage or lack of refrigerant Gear motor tends to run on reverse Too low gear motor rotating speed No rotation of gear motor Gear motor starts and stop after a while Replace fuse amp check for cause of blown fuse Turn switch to ON position Replace P C Board Check wiring Replace or clean ice level control See remed
13. TOR Setting of the dispensing time It s possible to modify the dispensing time to 5 10 or 15 seconds To modify the original setting time 5 seconds a Push and old the 4 switch CONTI NUOUS for 10 seconds till the first 3 lights start to blink b Push the 1 switch ICE for 5 seconds Push the 2 switch ICE WATER for 10 seconds Push the 3 switch WATER for 15 seconds Setting of resume mode default To modify the original resume mode ICE push for 5 seconds the desired switch ICE ICE WATER or WATER H CHECK OF THE DISPENSING OPERATING MECHANISM There are two different versions of dispensing label one with just ICE and CONTINUOUS push buttons and a second with ICE WATER ICE WATER and CONTINUOUS push buttons To check for the correct operation of the dispensing mechanism a Select first the Dispensing Mode by pushing the proper switch b Place a glass or a carafe in front of the two Optical Dispensing Devices c The dispensing drive motor and or the water solenoid valve starts to operate with ice and or water discharged through the bottom plastic spout The drive motor and or the water solenoid valve remains in operation as per setting dispensing time unless the glass or carafe is removed Push the CONTINUOUS switch and check again for the dispensing mechanism operation as per steps above The drive motor and or the water solenoid valve now remains in operation till the glass or carafe is re
14. TY Page 16 I FLOAT RESERVOIR The float reservoir consists of a plastic water pan on which is fitted a float valve with its setting screw The float valve modulate the incoming water flow to maintain a constant water level in the reservoir level that corresponds to the one in the freezing cylinder to ensure proper ice formation and fluidity On the inner side of the reservoir cover are fitted the two water level sensors which detects the presence orthe shortage ofwaterinthe reservoir NOTE Itis very importantto make sure of the correct fitting of the cover on the reservoir in order to enable the sensor to efficiently control the water situation avoiding undue shutoff interventions J FREEZING CYLINDER EVAPORATOR The freezing cylinder is made of a stainless steel vertical tube on which exterior is wrapped around the cooling coil with the evaporating chamber and in its interior is located the auger which rotates on its vertical axis and it is maintained aligned by the top and bottom bearings A water seal system is located in the bottom part of the freezer while at the top end is fitted the ice breaker The water constantly flowing into the cylinder bottom part freezes into ice when in contact with the cylinder inner walls The ice is then lifted up by the rotating auger and compacted and forced out by the ice breaker K ICE BREAKER The ice breaker is made by several rectangular openings where the ice
15. ace Machine runs but makes no ice Water not entering in the freezer Gear stripped Moisture in the system Air look in feed line to freezer Clogged feed line to freezer Clean it Check and repair Purge replace drier and re charge Water leaks Water seal leaking Water feed line to freezer leaking Float valve not closing Replace water seal Check and fasten hose clamp Check and adjust float valve setting screw Excessive noise or chattering Mineral or scale deposit on auger and inner freezer walls Low suction pressure Water feed line to freezer clogged Low water level into freezer Remove and manually polish auger and inner walls of freezer barrel using emery paper Add refrigerant to rise suction pressure Vent and clean it Adjust to approx 20 mm below ice spout Gear motor noise Worn rotor bearings Shortage or poor lubricant in gear case Gear case bearings and gear racers worn out Check and replace Check for proper lubricant opening gear case Top of gears must be covered with lubricant Check and replace worn parts Shortage of water Strainer at water inlet fitting clogged Float reservoir water nozzle clogged up Remove strainer and clean Remove float valve and clean nozzle Page 21 MAINTENANCE AND CLEANING INSTRUCTION A GENERAL The periods and the procedures for maintenance and cleaning are given as guides and are not to be cons
16. apacity is directly related to the condenser air inlet temperature water To keep your SCOTSMAN NUGGET DISPENSER atpeak performance levels periodic maintenance checks must be carried out as indicated on page 21 of this manual Page 4 388 15 9 32 874 34 13 32 44 300 1 47 64 11 13 16 SPECIFICATIONS 2 15 32 67 2 41 64 3945 15 17 32 663 26 7 64 BASE OPENING FOR HIDDEN CONNECTIONS DIMENSIONS MILLIMETERS INCHES 110 4 21164 TT CORD SET 213 8 25 64 220mm 1 7 25 32 WATER OUTLET 275 10 53 64 3 4 3 4 GAS WATER INLET TC 180 MACHINE SPECIFICATIONS Model Cond unit Finish Comp HP i per TC 180 AS Air S Steel 3 8 5 Kg 135 Electri Basic electr Amps ri Watts Wee i Nr of wires Amps fuse 230 50 1 3 4 18 590 13 2 3 x 1 5 mm 10 Page 5 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 TC 180 counter nugget ice dispenser Their ice making systems are thoroughly tested providing the utmost in flexibility to fit the needs of a particular user NOTE To retain the safety and performance built into this icemaker it is important that installation and maint
17. ar motor slow rotation to restart the unit it is necessary to press the RE SET push button or switch OFF and ON the power line main switch NOTE Any time the machine stops in alarm the front four LED s start to blink Page 13 REFRIGERANT METERING DEVICE capillary tube OPERATING PRESSURES With 21 C ambient temperature Discharge pressure 9 10 bar 125 140 psig Suction pressure 1 bar 14 psig REFRIGERANT CHARGE R 134 A 370 gr NOTE Before charging the refrigerantsystem always check the type of refrigerant and quantity as specified on the individual ice machine dataplate The refrigerant charges indicated are relatives to averages operating conditions Page 14 COMPONENT DESCRIPTION A EVAPORATOR TEMPERATURE SENSOR BLUE 2 POLES CONNECTOR MANUAL RESET The evaporator sensor probe is inserted into its tube well which is welded on the evaporator outlet line It detects the temperature of the refrigerant on the way out from the evaporator and signals it by suppying a low voltage current flow to the P C Board Micro Processor According to the current received the micro processor let the ice maker to continue its operations or not In case the evaporating tem perature after 10 minutes from the unit start up does not go below 1 C 30 F the evaporator sensor signal reaching the microprocessor is such to stop immediately the unit operation with the 3rd Warning YELLOW LED t
18. chine 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 9 Pour the cleaning solution into the water reservoir till reaches the proper level 10 After 15 minutes switch ON the Master switch to start the unit 11 Wait till the machine starts to discharge ice then continue to slowly pour the cleaning solution into the water reservoir taking care to maintain the level just below the overflow NOTE The ice made with the cleaning solution is slushy and coloured also it may tend to loose fluidity creating some resistence in being elevated and extruded this situation can be heard by the creacking noise made by the ice Should this occure itis recommended to stop for few minutes the ice machine in order to allow the ice in the freezer to partially melt 12 When all the cleaning solution has been used up open the water shutoff valve to allow new fresh water to flow into the reservoir Let the unit to continue to run until the ice resumes the normal colour and hardness 13 Stop the icemaker and pour warm water on the ice deposited into the storage bin to melt it up NOTE DO NOT use ice produced with the cleaning solution Be sure none remains in the bin SANIT
19. e dispensed through the same opening of the ice Page 17 WIRING DIAGRAM DISPENSING BOARD VERSION AIR AND WATER COOLED 230 50 1 A BLUE G GREY V YELLOW GREEN M BROWN N BLACK V GREEN R RED 1 D BIN EMPTY IR PRINTED CIRCUIT BOARD 2 TOO HI COND 3 STAND BY S T 100mA 3 S WRONG ROTATION HI EVAP TEMP LED FUSE 4 6 POWER ON TERMINAL BOARD 5 No WATER 6 ain FULL RESET TOO HI TEMP TX RX FAN MOTOR EVAPORATOR TEMP CAPACITOR A o K o va i GEAR MOTOR ROTATION G WATER LEVEL TEMP CONDENSAT OPTICAL ICE LEVEL BIN DRIVE MOTOR WATER INLET VALVE SENSORS GEAR MOTOR REDUCER DISPLAY INTERFACCIA TOUCH FREE SENSORS MOD 003 ONLY FOR TC 180 050537 01 Page 18 WIRING DIAGRAM PUSH BUTTONS VERSION AIR AND WATER COOLED 230 50 1 A BLUE G GREY GV YELLOW GREEN M BROWN N BLACK V GREEN R RED 1 QD BIN EMPTY UR PRINTED CIRCUI
20. e its original condition switching off the dispensing drive motor G FRONT DISPENSING SELECTOR DISPLAY BLACK SIX POLES CONNECTOR Placed in the upper front part of the dispensing area it is used to select according to the version of the machine a Ice first switch or a Ice first switch b Ice and water second switch c Water not chilled third switch It is also possible to set up for continuous dispensing operation just pushing the fourth switch before or after the selection of the dispensed product Once completed the dispensing selector display resumes its original dispensing setting mode NOTE It is possible to modify the original resume mode default by pushing for 5 seconds the corresponding switch all machines are supplied from the factory in the ICE dispensing mode It is also possible to modify the dispensing time controlled by the PC Board to 5 10 or 15 seconds by a Push and olt the 4 switch continuous for approximately 10 seconds till the first 3 lights start to blink b Pushing the 18 switch ICE is equivalent to 5 seconds Pushing the 2 switch ICE WATER is equivalent to 10 seconds Pushing the 3 switch WATER is equiva lent to 15 seconds H P C BOARD Data processor The P C BOARD fitted in its plastic box located inthe right side ofthe unit consists oftwo separated Page 15 printed circuits one at high and the other at low voltage protected by three
21. e light beam between the light source and the sensor gets interrupted by the flake ice which accumulates in the spout When the light beam is interrupted the 1st RED LED located in the front of the P C BOARD goes off in case the light beam gets interrupted for as long as 6 seconds the ice machine stops with the glowing up of the 6th YELLOW LED to monitor the full ice bin situation The 6 seconds of delay prevents that any minimum interruption of the light beam due to the regular ice chuting through the ice spout may stop the operation of the unit As soon as the ice is scooped out with the resumption of the light beam between the two infrared sensor of ice level control the RED LED lights up and after 6 seconds the ice machine resume its operation with the simultaneous extinguishing the 6th YELLOW LED F ICE WATER OPTICAL DISPENSING DEVICE BLUE FOUR POLES CONNECTOR Located on the front of the dispensing area it consists of the combination of an infrared Transmitter and Receiver When a glass or a carafe is placed in front of the Infrared sources the optical device transmits a signal to the PC Board that is equivalent to activate the dispensing drive motor which in turn putin rotation a dispensing vane that pushes the ice towards a rectangular opening located in the bottom of the storage bin Elapsed the dispensing time 5 10 or 15 seconds according to the setting or after have removed the glass carafe the infrared resum
22. en the ice maker stops on account of this protective device there is a simultaneous glowing of the 2nd RED LED warning the user of the Hi Tem perature situation After having eliminated the source of the excessive condenser tem perature to restart the ice machine it is necessary to push the RE SET button that protrudes through the control box cover The 2nd RED LED starts blinking and three minutes later the flaker unit resume its normal operating mode The refrigerant suction or Lo pressure sets in normal ambient conditions 21 C on the value of 1 bar 14 psig after few minutes from the unit start up This value can vary of 0 1 or 0 2 bar 1 5 3 psig in relation to the water temperture variations influencing the freezer cylinder NOTE If after ten minutes from the unit start up no ice is made and the evaporating temperature detected by the evaporator sensor results to be higher than 1 C 30 F the ice maker stops and the 3RD WARNING YELLOW LED blinks MECHANICAL SYSTEM The mechanical system of the SCOTSMAN Nugget Ice Dispenser consists basically of a gear motor assembly which drives through a ratched coupling a worn shaft or auger placed on its vertical axis within the freezing cylinder The gear motor is made of asingle phase electric motor with a permanent capacitor This motor is directly fitted in the gear case through which it drives in counter clockwise rotation at a speed of 9 5 r p m
23. enance be conducted in the manner outlined in this manual B UNPACKING AND INSPECTION 1 Call your 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 carriers representative present 3 a Cut and remove the plastic strip securing the carton box to the skid b Cut open 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 top and sides panels of the unit and inspect for any concealed damage Notify carrier of your claim for the concealed damage as Stated in step 2 above 5 Remove all internal support packing and masking tape 6 Checkthatrefrigerantlines do notrub against or touch other lines or surfaces and that the fan blades move freely 7 Check that the compressor fits snugly onto all its mounting pads 8 Use clean damp cloth to wipe the surfaces outside of the cabinet 9 See data plate on the rear side of the unit and check that local main voltage corresponds with the voltage specified on it CAUTION Incorrect voltage supplied to the icemaker will void your parts replacement program 10 Remove the manufacturer s registration card from the inside of
24. ent arriving to the micro processor is such to cause an immediate and total stop of the machine operation with the glowing of the 2nd RED WARNING LED NOTE To restart the unit after the shutoff caused by the hi condenser temperature it is necessary to push the RE SET button after having remedied to the causes of unit stoppage or to switch OFF and ON the power line main disconnect Switch D GEAR MOTOR ROTATION AND SPEED SENSOR RED FOUR POLES CONNECTOR MANUAL RESET This safety device is housed on top of the Drive Motor and detects based on Hall Effect principle the rotating speed and rotating direction of the drive Motor Should the rotating speed drop below 1300 r p m the magnitude measured by this device is such to signal to the microprocessor to stop the unit and light up the 3rd YELLOW LED The same reaction occures when the drive motor will tend to rotate in the wrong direction counterclockwise or it doesn t rotate at all NOTE To restart the unit after the shutoff caused by this safety device it is necessary first to eliminate the cause that has generated the intervention of the device and then press the RE SET push button or switch OFF and ON the power line main disconnect switch E ICEBINLEVEL LIGHT CONTROL BLACK FOUR POLES CONNECTOR AUTOMATIC RESET The electronic ice bin level control located into the ice spout has the function to stop the operation of the ice machine when th
25. f the water system while too soft water with too lo contents of mineral salts will produce a very hard flaker ice PLUMBING CONNECTIONS MUST CONFORM TO ALL APPLICABLE CODES CONNECT TO POTABLE WATER ONLY The model TC 180 has the possibility to have the water connections through the bottom base or through the rear bottom side of the machine In this second case it is necessary to remove the rear bottom small panel WATER SUPPLY Connect the 3 4 GAS male of the water inlet fitting using 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 installation of an appropriate water filter or conditioner Page 6 WATER DRAIN The recommended drain tube is a plastic or flexible tube with 18 mm 3 4 I D which runs to an open trapped and vented drain When the drain is a long run allow 3 cm pitch per meter 1 4 pitch per foot Install a vertical open vent on drain line high point at the unit drain connection to ensure good draining The ideal drain receptacle is a trapped and vented floor 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 ro
26. fuses integrated with a RE SET button Also it consists of six aligned LEDS monitoring the operation of the machine and of input terminals for the leads of the sensor probes as well as input and output terminals for the leads of the ice maker electrical wires The P C BOARD is the brain of the system and it elaborates through its micro processor the signals received from the sensors in order to control the operation of the different electrical components of the ice maker compressor gear motor etc as well as the dispensing of the ice and water The six LEDS placed in a row in the front of the P C BOARD monitor from right to left the following situations RED LIGHT Empty storage bin RED LIGHT ON all the time Unit shut off due to a too hi condensing temperature gt 70 C Blinking 3 minutes start up delay time YELLOW LIGHT ON all the time Unit shut off due to the wrong rotation direction of gear motor Unit shut off due to the too lo speed of gear motor Blinking Unit shut off due to a too hi evaporating temp gt 1 C after 10 min of operation GREEN LIGHT Unit under electrical power YELLOW LIGHT Unit shut off due to a too lo water level into float tank YELLOW LIGHT Unit shut off at full storage bin POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO HI COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMP
27. hat blinks B WATER LEVEL SENSOR RED TWO POLES CONNECTOR AUTOMATIC RESET This sensor system consist of two small stainless steel rods vertically fitted on the inner face of the reservoir cover and electrically connected to the low voltage circuit of the P C Board When the cover of the reservoir is positioned in its place the tips of both the rods dip into the reservoir water and detects and signals its presence by supply power back to the P C Board NOTE In the event of shortage of water in the reservoir or in case the water used is too soft de mineralized to cause greater resistence to the current flow conductivity lower than 30 uS this sensor system causes the shutoff of the machine to protect it fromrunning with an interrupted or inadequate water supply In this situation the 5th YELLOW LED will glow to warn of the machine shutoff and the reason why C CONDENSER TEMPERATURE SENSOR BLACK TWO POLES CONNECTOR MANUAL RESET The condenser temperature sensor probe located within the condenser fins detects the condenser temperature variations and signals them by supplying current at low voltage to the P C BOARD In relation to the different current received the micro processor of the P C BOARD supplies through a TRIAC the power at high voltage to the fan motor so that it can cool the condenser and reduce its temperature In the event the condenser temperature rises and reaches 70 C the curr
28. he system or inoperative compressor or evaporator sensor itis necessary to push the RE SET BUTTON that protrudes through the hole of the control box cover The unit before resuming the total operation willgo through the usual 3 minutes STAND BY period OPERATION CHECKS UPON THE UNIT START UP D Remove service panels and if necessary install the refrigerant service gauges on the corresponding Service valves to check both the HI and LO refrigerant pressures NOTE The condenser temperature sensor which is located within the condenser fins keeps the head condensing pressure between two preset valves Incase ofcondenser clogging such to prevent the proper flow of the cooling air or in case the fan motor is out of operation the condenser temperature rises and when it reaches 70 C 160 F the condenser tempe rature sensor shuts off the ice maker with the consequent light up of the 2nd RED WARNING LIGHT Fig 4 After having diagnosed the reason of the temperature rise and removed its cause it is necessary to proceed as per the previous NOTE to start up again the operation of the ice maker POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEADY TOO Hi COND TEMP BLINKING 3 WAITING TIME STORAGE BIN EMPTY POWER NO WATER FULL STORAGE BIN STEADY HALL EFFECT GEAR MOTOR BLINKING TOO HI EVAP TEMP STEA
29. ies for shortage of water or install a mineral salt metering device Dirty condenser Clean Inoperative fan motor Replace Check andcharge refrigerant system Check gear motor capacitor Check rotor bearings freezer bearings and interior of freezer for scores Replace whatever worn or damaged Check for power to drive motor 16 A fuses Check for stator winding Check for correct operation of drive motor magnetic sensor Check for correct magnetic capacity of magnetic cylinder Compressor cycles intermittently Low voltage Non condensable gas in system 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 Check for loose wires in starting device Low ice production Capillary tube partially restricted Moisture in the system Low water level in the freezer Shortage of refrigerant Pitted or stained auger surface Blow charge add new gas amp drier after evacuating system with vacuum pump Same as above Adjust to approx 20 mm below ice spout Check for leaks amp recharge Clean or replace auger Page 20 SERVICE DIAGNOSIS SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Wet ice Ambinet temperature too high High water level in the freezer Faulty compressor Move unit to cooler location Lower to approx 20 mm below ice spout Repl
30. moved I Ifpreviously installed remove the refrigerant service gauges and re fit the unit service panels previously removed J Instruct the owner user on the general operation of the ice machine and about the cleaning and care it requires DISPENSING LIGHTS ICE ICE AND WATER amp WATER 0 CONTINUOUS PUSH BUTTONS Page 11 PRINCIPLE OF OPERATION WATER CIRCUIT The water enterinthe machine through the water inlet fitting which incorporates a strainer and itis located at the rear side of the cabinet and then it goes to the water reservoir flowing through a float valve NOTE The presence of the water in the float reservoir is detected by a system of two sensors which operates in conjunction with the P C Board The two sensors use the water as a conductor to maintain a low voltage current flow between them In case the water used is very soft de mineralized or the float reservoir gets empty the current flow between the sensors become so weak or is no longer maintained that as consequence the P C Board shutoff the flaker operation with the simultaneous glowing of the YELLOW LED signalling Shortage of water The float reservoir is positioned at the side of the freezing cylinder at such an height to be able to maintain a constantwater level around the freezer auger In fact the water flows from the reservoir into the bottom inlet of
31. nt on them can be removed with the help of a bit of SCOTSMAN Cleaner plain 7 With the ice machine and fan motor OFF clean condenser using vacuum cleaner whisk broom or non metallic brush taking care to do not damage the condenser temperature sensor 8 Check for water leaks and tighten drain line connections Pour water into the sink to be sure that drain line is open and clear 9 Check the ice level control sensor to test shut off Put your hand between the light source and the receiver on the upper side of the storage bin so to cut off the light beam for at least 6 seconds This should cause the immediate extinguishing of the 1st RED LED located in the front face of P C Board and 6 seconds later the total stopping of the ice maker with the simultaneous light up of the 6th Yellow LED Within few seconds from the removal of the hand from between the sensor lights the ice maker resume its operation NOTE The ice level control uses devices that sense light therefore they must be kept clean enough so they can see Every month clean wipe the sensing eyes with a clean soft cloth 10 Check for refrigerant leaks and for proper frost line which should frost as far as approx 20 cm 8 from the compressor When doubtful about refrigerant charge install refrigerant gauges on corresponding Schrader valves and check forcorrect refrigerant pressures See Operating pressure at page 19 of this manual
32. om where ambient temperatures are within a minimum of 10 C 50 F even in winter months 2 Is there at least a 15 cm 6 clearance around the unit for proper air circulation 3 Is the unit level 4 Have all the electrical and plumbing 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 Hasthe 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 Has the owner user been given the User Manual and been instructed on the importance of periodic maintenance checks 9 Has the Manufacturer s registration card been filled in properly Check for correct model and serial number against the serial plate and mail the registration card to the factory 10 Has the owner been given the name and the phone number of the authorized SCOTSMAN Service Agency serving him Page 7 OPERATING INSTRUCTIONS START UP After having correctly installed the ice maker and completed the plumbing and electrical connec tions perform the following Start up procedure A Openthe water supply line shutoff valve and give power by moving the main switch on the power supply line to the ON position The GREEN LED will glow to signal that unit is under power NOTE Every time the unitis put under power
33. rs open for proper air exhaust 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 the rear of the unit Make sure that the ice machine is connected to its own circuit and individually fused see data plate for fuse size 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 All external wiring should conform to national state and local standards and regulations Check voltage on the line and the ice maker s data plate before connecting the unit E WATER SUPPLY AND DRAIN CONNECTIONS GENERAL When choosing the water supply for the ice flaker 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 will tend to produce scale build up on the interior parts o
34. suction accumulator and through the suction line where the refrigerant exchanges heat with the one flowing into the capillary tube warmer before being sucked into the compressor to be recirculated The refrigerant heat pressure is kept between two pre set values 9 10 bar 125 140 psig by the condenser temperature sensor which has its probe located within the condenser fins in air cooled versions This condenser temperature sensor when senses a rising of the condenser temperature beyond the pre fixed limit changes its electrical resistance and send a low voltage power flow to the MICRO PROCESSOR of the P C Board which energizes through a TRIAC the Fan Motor in ON OFF mode Page 12 When the opposite situation occures i e the condenser temperature gets below the pre fixed EVAPORATOR SUCTION LINE er CONDENSER FAN MOTOR limit the temperature sensor changes again its electrical resistance reducing therefore the current flow to the P C Board to cause a tempo rary stop of the Fan Motor NOTE In case the condenser temperature probe senses thatthe condenser temperatu re has rised to 70 C 160 F for one of the following abnormal reasons CLOGGED CONDENSER FAN MOTOR OUT OF OPERATION AMBIENTTEMPERATURE HIGHER THEN 43 C 110 F it causes the total and immediate SHUT OFF of the machine in order to prevent the unit from operating in abnormal and dangerous conditions Wh
35. the User Manual and fill in all parts including Model and Serial Number taken from the data plate Forward the completed self addressed registration card to SCOTSMAN EUROPE factory C LOCATION AND LEVELLING WARNING This Ice Dispenser is designed for indoor installation only Extended periods of operation at temperature exceeding the following limitations will constitute misuse under the terms of the SCOTSMAN Manufacturer s Limited Warranty resulting in LOSS of warranty coverage 1 Position the unit in the selected permanent location Criteria for selection of location include Min Max Air Temperature 10 C 40 C Water Temperature 5 C 35 C Water pressure 1 bar 5bar Voltage 10 10 Compared to the nameplate Service access adequate space must be left for all service connections through the rear of the ice maker This machine is air cooled and sucks air through the left side panel and blows air out the rear side of the top panel Do not install the machine where the left side air flow might be blocked A minimum clearance of 15 cm is required It is important that the machine be installed in a location where it has enough space around it to be accessible for service and minimum of 150 mm be allowed at the left and upper side for air circulation Try to avoid hot dirty and crowded locations NOTE It is imperative to do not place on top of the machine any sort of goods and leave the upper lowe
36. trued as absolute or invariable Cleaning especially will vary depending upon local water and ambient conditions and the ice volume produced and each icemaker must be maintened individually in accordance with its particular location requirements B ICEMAKER The following maintenance should be scheduled at least two times per year on these icemakers 1 Check and clean the water line strainer 2 Remove the cover from the float reservoir care to do not damage the two water sensors and depress the float to make sure that a full stream of water enters into the reservoir 3 Check thatthe icemaker is levelled in side to side and in front to rear directions 4 Check that the water level in the water reservoir is below the overflow but high enough that it does not run out of the spout opening NOTE The float must close positively the incoming water flow when the rubber housed in the setting screw is perpendicular to the water nozzle 5 Clean the water system water reservoir and the interior of freezing cylinder using a solution of SCOTSMAN Ice Machine Cleaner Refer to procedure C cleaning instructions and after cleaning will indicate frequency and proce dure to be followed in local areas NOTE Cleaning requirements vary according to the local water conditions and individual user operation 6 If required polish the two sensor rods secured to the float reservoir cover heavy scale sedime
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