Service Manual - CMS1202

CMS1202INTRODUCTIONTo the owner or user: This service manual isintended to provide you and the maintenance orservice technician with the information needed toinstall, start up, clean, maintain and service thisice system. Table of Contents 2 3Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Location & Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Freeze Cycle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Harvest Cycle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Parts Lists and Wiring Diagrams are locatedin the center of this manual, printed onyellow paper.September 1993 Page 1

CMS1202 Scotsman Ice Systems are designed and manufactured with the highest regard for safetyFOR THE INSTALLER and performance. They meet or exceed the standards of U.L., N.S.F., and C.S.A.The CMS1202 will fit Scotsman’s ice storage bin(48\" wide) model BH900, and with adaptors, the Scotsman assumes no liability or responsibility offollowing Scotsman ice storage bins: any kind for products manufactured by Scotsman that have been altered in any way, including the •BH1000 (use KBT21) use of any parts and/or other components not •BH1360. specifically approved by Scotsman.When stacking onto another CMS1202 or a Scotsman reserves the right to make designCMS1402, use kit KSCMS48. changes and/or improvements at any time. Specifications and designs are subject to changeThe normal finish for the machine is enamel without notice.sandalwood. An optional stainless steel panel kit(SPKCMS1402) can be field installed. It contains a This manual covers A and B models.stainless steel top, left side panel, an overlay rightside panel, and front panel. Water Cooled Air CooledModel Number Dimensions (w/o bin) Basic Minimum Circuit Maximum Refrigerant Condenser W\" x D\" x H\" Electrical Ampacity* Fuse Size Charge TypeCMS1202AE-3B 48 x 243⁄8 x 271⁄2 208-230/60/3 14.8 20 60 oz. R-22 AirCMS1202WE-3B 48 x 243⁄8 x 271⁄2 208-230/60/3 14.1 20 64 oz. R-22 WaterCMS1202AE-32B 48 x 243⁄8 x 271⁄2 208-230/60/1 20.8 30 60 oz. R-22 AirCMS1202WE-32B 48 x 243⁄8 x 271⁄2 208-230/60/1 20.1 30 64 oz. R-22 Water* Minimum Circuit Ampacity is used to determine wire size and type per the National Electric Code. If thenameplate has different numbers from the above, go by the nameplate.This ice system is designed to be installed indoors, in a controlled environment.Air Temperature MINIMUM MAXIMUMWater Temperature 500F. 1000F. 400F. 1000F.Water Pressure 20 psi 80 psi September 1993 Page 2

CMS1202FOR THE INSTALLER: Location & AssemblyLocation: ICE MACHINE AND BIN ASSEMBLYAfter uncrating and inspection, the unit is ready for SHIPPINGinstallation. It is important that the machine be BRACKETSinstalled in a location where it has enough spacearound it to be accessible for service. A minimumof 6\" must be allowed at the back for air circulationon air cooled models. Try to avoid hot, dirty andcrowded locations. Be sure that the location for themachine is within the envrionmental limitations.Storage Bin:Tip the storage bin on its back, using parts of thecarton to protect the exterior finish. Install the legs,use a heavy duty leg kit if stacking two icemachines on one bin.1. Arrange for proper electric, water and drain.See instructions for the plumber and for theelectrician.2. After mounting the legs, position the ice storagebin in the selected location:Note: Allow enough space to the left and back toservice the machine. Do NOT push the bin intopostion, instead, lift it there. Pushing a bin maydamage the legs and leg mounts.Level the bin in both the front to rear and side toside directions by adjusting the leg levelers.Select a well ventilated location for air cooledmodels.Note: Air cooled models blow air from front to back.3. Inspect the bin top mounting gasket whichshould be flat, with no wrinkles, to provide a goodwater seal when the cuber is installed on top of thebin.Ice Maker:Install the modular cuber on top of the bin usingcare to be sure a good seal is made between thetwo cabinets. Use of a mechancial lift isrecommended. Align the holes in the bottom rearof the cabinet to mate with the two mounting holeson the top rear of the bin.Use bolts and straps found on the back of theicemaker to secure the ice machine to the bin.When alignment and leveling are completed,tighten the bolts to secure the mounting straps.Remove the front panel, and remove theevaporator shipping brackets and hardware.September 1993 Page 3

CMS1202FOR THE INSTALLER: Location & AssemblyStacking Instructions At the back of the two icemakers, bolt the upper icemaker cabinet to the lower icemaker cabinetWhen stacking two units, remove the top panel using the mounting straps and bolts from theand the evaporator cover from the lower icemaker. hardware package.(The top removed from the lower icemaker will nolonger have any function.) A stacking kit is required to interconnect the CMS ice level controls.Carefully lift the uncrated top unit onto the bottomone and align the two cabinets. Use of a A different stacking kit is required to stack a CMSmechanical lift is recommended for this step. machine onto a CM model.STACKING OPTIONAL TRIM STRIP EVAPORATOR COVER September 1993 Page 4

FOR THE ELECTRICIAN CMS1202SEE NAMEPLATE for current requirements to Electrical connections are made at the rear ofdetermine wire size to be used for electrical the icemaker, inside the junction box.hookup. The cuber requires a solid chassis to All external wiring should conform to thechassis earth ground wire. See Wiring Diagram. national, state and local electrical codeBe certain the cuber is connected to its own requirements. Usually an electrical permit andelectrical circuit and individually fused. Voltage services of a licensed electrician will bevariation should not exceed ten percent of the required.nameplate rating, even under starting conditions.Low voltages can cause erratic operation and GROUND SCREWmay be responsible for serious damage to theicemaker. DETAIL OF JUNCTION BOX HAND DISCONNECT SWITCHJUNCTION BOXELECTRICAL CONNECTIONS, WATER COOLED ELECTRICAL CONNECTIONS, AIR COOLEDSeptember 1993 Page 5

CMS1202 DRAINFOR THE PLUMBER Connections: All drains are gravity type and must have a minimum of 1/4-inch fall per foot onFOLLOW ALL LOCAL CODES: horizontal runs. The drains to be installed to conform with the local plumbing code. Install aThe recommended water supply line is a 3/8-inch vertical open vent on drain line high point to insureO.D. copper tubing with a minimum operating good draining. The ideal drain receptacle is apressure of 20 PSIG and a maximum of 80 PSIG. trapped and vented floor drain. Recommended bin drain is 5/8 inch O.D. copper tubing and should beConnect to cold water supply line with standard vented and run separately. Insulation for highplumbing fittings, with shut off valve installed in an humidity areas is recommended.accessible place between thewater supply and thecuber. ln some cases a plumber will be required. Terminate drains above the drain receptacle with the proper air gap per local code.Water Limitations:An ice machine is a food manufacturing plant, it The ice machine sump drain is 3/4\" FPT. Theretakes in a raw material, water, and turns it inot a must be a vent at this connection for proper sumpfood product, ice. The purity of the water is very drainage.important in obtaining pure ice and in maximizingproduct life. It is generally better to filter the water, WATER COOLED MODELS: On water cooledalthough there is no one filter that will cure all models, a separate cold water supply inlet iswater problems. A good filter combined with a required, to be connected to a 3/8-inch femalepolyphosphate feeder gives about the best overall pipe thread (FPT) fitting at the rear of the cabinet.performance. An additional drain line is required to drain the water cooled condenser, and must not interconnect to any other of the unit’s drains. AIR COOLED WATER COOLEDOPTIONAL CONNECTIONS CONNECTIONSFILTER 3/8\" MALE SUMP DRAIN MUST CONDENSER CONDENSER INLET DRAIN FLARE BE VENTEDPOTABLE HAND SHUT OFF WATER VALVE SUPPLY 3/4\" FPT AIR GAP AIR GAP VENT BIN BETWEEN BETWEEN DRAIN DRAINDRAIN LINES LINES AND AND BUILDING DRAIN BUILDING DRAIN WATER SUPPLY AND DRAIN CONNECTION September 1993 Page 6

FINAL CHECK LIST CMS12021. Is the cabinet in a room where ambient 8. Is the water supply line shut off valve installedtemperatures are within the minimum and and electrical wiring properly connected?maximum temperatures specified? 9. Check all refrigerant lines and conduit lines, to2. Is there at least six inches clearance at the left guard against vibration or rubbing and possibleand back sides of the cabinet for proper air failure.circulation? (Air Cooled models) 10. Have the bin and cabinet been wiped clean?3. Has water supply pressure been checked toinsure a minimum of 20 PSIG and a maximum of 11. Has the Manufacturers Registration form been80 PSIG operating pressure? properly filled out? Check for correct model and serial numbers from Serial nameplate, then mail4. Is the cabinet level? the completed card to the SCOTSMAN factory.5. Check that any shipping material has been 12. Has the owner/user been given the Serviceremoved from inside the cabinet. Manual and instructed how to operate and maintain the icemaker?6. Check that the reservoir is properly secured tothe bottom of the evaporator plates. 13. Has the owner been given the name and telephone number of the authorized SCOTSMAN7. Have all electrical, water and drain connections Service Agency serving him?been made? LEVEL ASSEMBLYSUMPDRAINHAND SHUT OFF VALVE WATER COOLED DRAINHAND SHUT BINOFF VALVE DRAIN OPTIONAL FILTER FINAL INSTALLATION September 1993 Page 7

CMS1202INITIAL START UP1. Remove the front panels by removing screws at FRONT VIEW OF TIMERthe base and pulling out.2. Remove two screws and the control box cover.3. Check that the two switches on the control box, ACTUATOR MICROSWITCHthe ICE-OFF-WASH rocker switch and the BUTTONCOMPRESSOR ON-OFF toggle switch are in theOFF position. CAM4. OPEN the water supply line shut off valve.5. Switch the electrical power ON.6. Inside the control box is the shaft of the timer HARVESTand the switch assembly. Rotate the shaft of the PORTIONtimer and switch assembly clockwise until the camis lined up as shown in “Front View of Timer”.7. Move the ICE-OFF-WASH rocker switch to theICE position.8. Check the water fill cycle: For several minutes FREEZEthe inlet water valve will be open and water will PORTIONflow into the reservoir. Near the end of the fillcycle, water should be overflowing the reservoirand draining thru the reservoir drain. If at the endof the fill cycle the reservoir is not full, repeat step6.Check that the sump covers are snapped in place.Check that the water distributors are properly CONTROL BOXseated at the top of the evaporators, and thatwater is flowing over all cube cells.Note: Some water spray from the evaporators isnormal when the machine is new. The spray willquit after a few cycles.9. When the sump has filled, move the compressorON-OFF toggle switch, to the ON position.10. On air cooled models the fan motors will beginto blow warm air out the back of the machine.Water cooled models will begin to flow warm waterout of the condenser drain.Note: To optimize the balance between ice CUBE SIZEproduction and water use, the freeze cycle CONTROLdischarge pressure must be 220 P.S.I.G. Checkdischarge pressure and adjust the water regulatingvalve to obtain 220 P.S.I.G. discharge pressure.11. Check operation of the freezing cycle: Ice will TIMERbegin to form from the top of the evaporatorsdown. After the first cycle freezing time will rangebetween 15 and 18 minutes. Freeze cycle time islonger for temperatures above 70oF. and shorterwhen temperatures are below 70oF. Averagecomplete cycle time is about 19 minutes. September 1993 Page 8

CMS1202INITIAL START UP12. After an ice harvest check Cube Size. There CUBE SIZE DIAGRAMis just enough water in the reservoir to make one JUST RIGHTfull sized batch of cubes. The water pump maypick up some air at the end of the freezing cycleand then bubbles in the pump discharge hose arenormal. If the water pump quits pumping water, thecube size control may be set too cold, or the watersystem may be leaking water.Compare cube size to the \"Cube Size Diagram\". When the cubes are the correct size, they will be connected together vertically, and drop off in strips.To adjust cube size, locate the cube size control inthe front of the control box, and rotate the The batch weight will be about 13.5 to 14.5 lb.adjustment screw one eighth of a turn Note: If the cubes at the bottom rows of some evaporatorsCOUNTER Clockwise to produce SMALLER sized are smaller than others. the size difference does not affectice cubes capacity or performance. However, there should be someClockwise to produce LARGER ice cubes ice in all cells. If not, contact the Factory.Check the size of ice cubes in the next cube TOO SMALLharvest and repeat the adjustment until the correctice cube size is achieved.13. Check Harvest Time. There must be enoughtime in harvest to defrost all the cubes, but not anexcessive amount that will waste capacity. Thelength of the harvest cycle is determined by thetimer cam positions.If needed, adjust the harvest time so that there are MICROSWITCH CLOSE UPabout 15 seconds of harvest time left after the last VIEW OF TIMERcube has fallen off the evaporators. SWITCHBecause harvest time varies with the water and air ACTUATORtemperatures at the ice machine, colder air andwater will result in faster ice making, but longer CAMharvest cycles. Do not adjust harvest time tooshort or the unit will not harvest all the ice.The harvest time is set by: loosening the set screwon the cam, rotating the shaft so that the openingbetween the cams increases or decreases,retightening the set screw when the cams are inthe desired position. More of an opening betweenthe cams = more harvest time.An adjustment of the cube size control may be The control has two postions, FULL and PARTIAL.needed after the harvest time has be changed. Full shuts the machine off when ice is 8\" from theCheck cube size again. bottom of the sensor socket. The control will not work on bins taller than 8’.14. Check Bin Ice Level Control: With theicemaker in a harvest cycle, place something flat & 15. Replace all covers, panels and screws.solid directly below the sensor socket (located 16. Fill out and mail in the Warranty Registrationnear the center back of the base). The machine and Customer Response form. Explain to thewill then switch OFF at the end of the harvest owner/user the operation and maintenancecycle. Within seconds after removal of the requirements of the ice machine. Inform the ownerobstruction the icemaker will restart. of the name and telephone number of the local SCOTSMAN Distributor or service agency. September 1993 Page 9

CMS1202 INLET WATER DISTRIBUTION WATERFREEZING CYCLE OPERATION VALVE RESERVOIR WATER SCHEMATICWater from the sump assembly is pumped to the DRAINwater distributor system at the top of eachevaporator plate. From the water distributor thewater cascades by gravity over all cells of the plateand to the sump assembly below.At the beginning of the freezing cycle, the electricalcircuit is completed to the compressor and thewater pump. The water pump operatescontinuously, through both the freezing cycle andthe harvest cycle.In water cooled models, water also flows throughthe condenser and out the drain.During the freezing cycle, the hot gas solenoidvalve and the water inlet solenoid valve areCLOSED. When the ice cubes are partiallyformed, the cube size control (sensing bulbattached to the suction line) will CLOSE, andconnect power to the timer motor. The timer thencontrols the remainder of the freezing cycle. Thetimer will keep the icemaker operating in thefreezing cycle for a selected length of time. Thiswill give the ice cubes time to fully form. afterwhich, the timer will switch the icemaker into theharvest cycle, through the contacts of the timerassembly microswitch. HOT GAS VALVECONDENSER FAN MOTOR WATER MANIFOLD EVAPORATOR WATER INLET VALVEDISCHARGE COMPRESSOR ACCUMULATOR WATER PUMP RESERVOIR LINE REFRIGERATION SCHEMATIC September 1993 Page 10

CMS1202HARVEST CYCLE - HOT GAS BYPASSWhen the timer switches the icemaker into the WATERharvest cycle, the finish relay is de-energized, and DISTRIBUTIONthe hot gas valve and inlet water valve OPEN.Then high pressure, high temperature gas INLETrefrigerant being discharged from the compressor WATERis diverted from the condenser through the hot gas VALVEsolenoid valve into each evaporator plate. Duringthis cycle, the refrigerant bypasses the condenser. DRAIN RESERVOIRBoth the compressor and the water pump areoperating. WATER SCHEMATICThe finished ice cubes are released from the sidesof each evaporator plate by the warming effect ofthe hot gas condensing in each evaporator plateand the water cascading over the ice cubes. Thereleased ice cubes drop into the ice storage binbelow. At the end of the harvest cycle, the timercam will push in the microswitch actuator arm. Ifthere is no ice close to the bin level control’stransducer, a whole new cycle will begin. If there isice within 8\" of the base of the machine (when thebin level control is set for full) the icemaker willshut OFF. FAN MOTOR HOT GAS VALVE WATER MANIFOLDCONDENSER EVAPORATOR WATER WATER PUMP INLET VALVEDISCHARGE COMPRESSOR ACCUMULATOR RESERVOIR LINE REFRIGERATION SCHEMATIC September 1993 Page 11

CMS1202 Timer - Timer & Switch AssemblyCOMPONENT DESCRIPTION The timer cam is controlled by the cube size control. The outer surface, or large diameter lobeCube Size Control of the timer cam, determines the timer cycle for finish freezing of the ice cubes, while the innerThis reverse acting thermostat controls the length surface, or small diameter lobe, determines theof the freezing cycle. It is sensing the temperature time cycle for the harvest cycle.of the suction line. When the suction line gets coldenough, the cube size control closes (on When the microswitch button is pushed in there istemperature fall) and starts the timer. A change in power connected to the coil of the relay, and theeither ambient air or incoming water temperature unit is in the freeze cycle. When the microswitchwill affect the efficiency of the refrigeration system, button is released, the power to the relay isand this will vary the length of time it takes the stopped, and the unit goes into harvest. Theevaporator to reach the temperature at which the microswitch is actuated by a cam assemblycube size control is preset to close. See CUBE directly connected to the timer motor.SIZE ADJUSTMENT BEFORE attempting toadJust the control. One complete rotation of the cam will take eight minutes. Harvest is preset at two and one fourthRelay minutes, but is adjustable.The multi-function, three pole, double throw, High Pressure Safety Controlplug-in relay is inserted into a receptacle on theprinted circuit board in the control box. The relay This is a manual reset control that shuts down thefunctions in part to by-pass the bin thermostat icemaker, should the discharge pressure evercontrol to prevent the icemaker from shutting OFF, reach 450 PSIG on air cooled and 350 PSIG onwhen the bin thermostat opens during the freezing water cooled. Found below the control box.cycle. The bypass action serves to ensurefull-sized ice cubes with each harvest cycle and,to prevent short cycling on the bin thermostatcontrol. CONTROL BOX CUBE SIZE CONTROL RELAY TIMER AND MICROSWITCH ICE/OFF/WASH SWITCH BIN ICE LEVELSELECTOR SWITCH September 1993 Page 12

COMPONENT DESCRIPTION CMS1202Bin Level Control Because it uses sound waves, a slight “ticking” sound can be heard coming from the bottom of theThis electronic control uses sound waves to machine.measure the distance between the bottom of the There are two parts to the control, the circuitice machine and the top of the ice in the bin. It is board, and the level control switch.designed to control the machine’s ice production tomaintain that distance. ICE/OFF/WASH SWITCHThe control is adjustable so that the ice machinewill maintain a certain height of ice. When set atFULL it will not allow the machine to fill the bin anycloser to the ice machine than about 8\", and it willnot work if the distance to the bottom of the bin isgreater than 8 feet. BIN ICE THE USER CAN LEVEL SELECT THESELECTOR SWITCH AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. SOUND WAVES FULL PARTIAL September 1993 Page 13

CMS1202 Water Distribution SystemCOMPONENT DESCRIPTION The water distribution system functions to evenly supply water to all cells of the evaporator plates.Water Inlet Solenoid Valve The water pump pumps water from the sump upThe water inlet solenoid valve fills the sump the vertical tygon tube to the tee. From there waterassembly with water. Extra water overflows out the is channeled through the water manifold to theoverflow standpipe of the sump. This action fills water distributors, above each evaporator plate,and rinses the sump during each harvest cycle. and from six holes within each distributor, waterThe flow rate is 1 g.p.m. flows to the cells of each side of the evaporatorWater Regulator Valve - Water Cooled Model plates. Gravity flow returns the unfrozen excessThe water regulator valve maintains a constant portion of water to the sump reservoir forcompressor head pressure, by regulating the recirculation.amount of inlet water flow through the condenseron water cooled models. The valve operates Hot Gas Solenoid Valvethrough the refrigerant system high side pressure.Rotating the adjusting screw, located on top of the The hot gas solenoid valve opens only during thevalve, can INCREASE or DECREASE the water harvest cycle, to divert the hot discharge gas fromflow through the water cooled condenser, which in the compressor, by passing the condenser andturn, will DECREASE or INCREASE the capillary tube, for direct flow to the evaporatorcompressor operating head pressure. lt is to be set plates to release ice cubes from the ice cubeat 220 PSIG. When installing a replacement water molds.regulator valve, be sure the replacement valve isinstalled with the arrow positioned in the direction Fan Pressure Control - Air-Cooled Models only.of the water flow. ln both freeze and harvest SUMP STANDPIPE WATER cycles, the fan pressure OPTIONAL DISTRIBUTORS WATER FILTER control functions to maintain a minimumHANDVALVE discharge pressure by cycling the fan on and off. The approximate C.I. is 210 PSIG and C.O. is 193 PSIG. Strainer A water strainer is located in the potable inlet water line before the water inlet solenoid valve. Clean the water strainer frequently. SUMPPUMPCOMPONENT LOCATION DRAIN CAP September 1993 Page 14

CMS1202CLEANING/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////A Scotsman Ice System represents a sizable investment of time and money in any company’s business. Inorder to receive the best return for that investment, it MUST receive periodic maintenance.Maintenance and Cleaning should be scheduled at a minimum of twice per year./////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////CLEANING: ICEMAKER 7. Pour the cleaning solution into the reservoir until1. Remove screws and the front panel. full.2. Switch the compressor switch to OFF. Switch 8. Move the WASH/OFF/ICE switch to the WASH position. Electrical Shock 9. Let the unit operate for 30 minutes. Hazard. During the wash cycle, if the machine runs out of Electrical shock can solution, mix 2 more gallons of solution per step 6, cause personal injury. refill the sump and continue the wash cycle for the remainder of the 30 minutes. Cleaning procedures are done with the power ON. 10. Move the WASH/OFF/ICE switch to the OFF position.the WASH/OFF/ICE switch to OFF. 11. Remove the reservoir drain cap and drain the3. Remove the control box cover, and rotate the cleaning solution from the sump. Replace the drainshaft of the timer and switch assembly cap.CLOCKWISE advancing to the freezing cycle.(Beginning of the higher part of the cam against 12. Rotate the shaft of the timer and switchthe microswitch). assembly CLOCKWISE to the harvest position (low part of the cam against microswitch). Move4. Open the ice storage bin door and empty the bin the WASH/OFF/ICE switch to the ICE position toof ice. start the Harvest cycle.5. Remove the hose clamp, rubber cap and drain If, after completing this procedure, one or moreall the water from the sump assembly into a evaporator plates does not have a full flow of watercontainer. for each vertical column of cubes, shut down the operation and remove and clean all waterReplace the rubber cap and hose clamp. distributor manifolds. Reinstall the water distributor manifolds.6. Mix 24 ounces of Scotsman Ice Machine Note: Thie ice making portion of the water systemCleaner with 2 gallons of warm (950F. - 1150F.) should be sanitized after cleaning by repeatingwater. steps 2-12, except substitute an approved sanitizing solution for the cleaning solution. Scotsman Ice Machine 13. Move the compressor ON-OFF switch to the Cleaner contains acids. ON position to start the icemaking process. These compounds may cause burns. ////////////////////////////////CAUTION////////////////////////////////// If swallowed, DO NOT DO NOT use ice produced from the cleaning induce vomiting. Give solution. Be sure none remains in the bin. large amounts of water or milk. Call Physician /////////////////////////////////////////////////////////////////////////////////// immediately. In case of external contact, flush 14. Check the next ice cube harvest to be sure that with water. the ice cubes are clear and the acid taste is gone. KEEP OUT OF THE 15. Add hot water to the bin to melt the ice. REACH OF CHILDREN. 16. Replace all panels. September 1993 Page 15

CMS1202 CLEANING AIR COOLED CONDENSER CONDENSERCLEANING MUST BEAIR COOLED CONDENSER CLEAN1. Disconnect electrical power. FILTER The fan blade can To Remove Scale: cause personal injury. 1. Mix a cleaning solution of 4 ounces of Scotsman Disconnect power Ice Machine Cleaner to 4 pints of hot (950F. to before begining to clean 1100F.) water. condenser. 2. Using rubber gloves, dip a nylon scouring pad2. Remove front panel. into the cleaning solution, and scrub the scale off of the liner.3. Clean or replace the air filter. 3. After all the scale has been removed, rinse all of4. Check to see that the inside of the condenser is the surfaces inside the bin with clean, potableclean; light should be visible through the fins. If not water.clean the internal parts by vacuum, pressurewasher and/or coil cleaner. To sanitize the bin and ice machine interior.ICE STORAGE BIN Use an approved sanitizer and follow the directions and warnings of that sanitizer or use theThe interior liner of the bin is in contact with a food following instructions for use of household bleach,product: ice. The storage bin must be cleaned if it meets local codes:regularly to maintain a sanitary environment.Once a week cleaning with soap and water, a hot 1. Mix a sanitizing solution of 1 ounce ofwater rinse and an air dry is a basic procedure. household bleach to 2 gallons of water.Scale that may form on the plastic liner can be 2. Using clean rubber gloves and a clean cloth,removed by scrubbing the surface with a mixture wipe all interior surfaces of the ice machine andof Scotsman Ice Machine Cleaner and hot water. ice storage bin with the santizing solution.Remove any scale prior to sanitizing. Immerse any small parts in the sanitizing solution and wash the parts, flushing the solutionNote: Some ice storage bins have stainless steel thoroughly in, over and through all parts andliners. They may become stained from chlorine surfaces of the parts being cleaned.gases released from the water. These stains mustbe removed by regular cleaning to prevent pitting 3. Allow to air dry.of the metal liner. To prevent the staining, anactivated charcoal water filter should be added tothe ice machine’s incoming water supply line;activated charcoal removes the chlorine. This mayrequire more frequent sanitation. Scotsman Ice Machine Cleaner contains acids. These compounds 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.September 1993 Page 16

ADJUSTMENTS CMS1202Adjustment Of The Water Regulator Assembly - Adjustment Of The Cube Size ControlWater-cooled Models //////////////////////////////CAUTION////////////////////////////////////The correct compressor head pressure on watercooled models is 220 PSIG. Adjusting the water BEFORE adjusting the cube size control, checkregulator valve increases or decreases the rate of other possible causes for cube size problems,flow of water, through the water cooled condenser; refer to Service Diagnosis section. DO NOTwhich increases or decreases the affected perform adjustment when a new cube size controltemperature/pressure of the compressor head is installed until the control bulb has been properlypressure, INCREASED water flow, results in installed in the tube well, and the icemaker hasDECREASED or LOWER head pressure; while, been through a complete freezing and harvestDECREASED water flow, results in INCREASED cycle.or Higher head pressure. ///////////////////////////////////////////////////////////////////////////////To adjust the water regulator assembly: Adjustment of the cube size control is available to change the cubes to the correct size, see INITIALTo INCREASE the head pressure, rotate the START UP.adjusting screw COUNTER Clockwise.To DECREASE the head pressure, rotate the To produce LARGER sized ice cubes:adjusting screw Clockwise. Check change incompressor head pressure, and repeat adjustment 1. Locate the cube size control, on the front of theas necessary, to achieve desired operating head control box.pressure. 2. Rotate the adjusting knob one-eighth of a turn Clockwise. 3. Observe size of ice cubes in next ice cube harvest and, if needed, repeat step 2 above until correct ice cube size is achieved. To produce SMALLER sized ice cubes: 1. Locate the cube size control, on the front of the control box. 2. Rotate the adjusting knob one-eighth of a turn COUNTER Clockwise. 3. Observe size of ice cubes in next ice cube harvest and, if needed, adjust again until correct ice cube size is achieved.ADJUSTMENT OF THE WATER REGULATING VALVE September 1993 Page 17

CMS1202 To Adjust The Timer & Switch Assembly: The length of the harvest cycle can be changed byADJUSTMENTS loosening the set screw on the cam, and then rotating the shaft so that the opening between theAdjustment Of The Timer & Switch Assembly cams change. More of an opening between the cams = more harvest time. Electrcial power present in the control box can TIMER cause personal injury. Disconnect power before begining to adjust timer.One complete revolution of the cam on the timer ADJUSTING TIMER CAMtakes eight minutes. The normal setting is two and MICROSWITCHone-quarter minutes, as set at the factory. lt is CLOSE UPimportant that the length of the harvest cycle allow VIEW OF TIMERenough time for all the ice cubes to fall from theevaporator. Too short of a time will cause the SWITCHevaporator to freeze up and stop ejecting ice into ACTUATORthe bin. Too much time wastes icemaking capacity,energy and water. Adjustment of the harvest cyclemay require a corresponding adjustment of thecube size control. Rotating the shaft of the timercam clockwise will allow putting the machine intoeither the freezing cycle or harvest cycle, asrequired in the cleaning instructions. CAMSeptember 1993 Page 18

CMS1202SYSTEM SPECIFICATIONSThe following numbers can be used as a guideline when servicing the CMS1202. There will be somevariation from unit to unit, so allow for that.COMPONENTS:Timer, 1 revolution of the cam takes 8 minutes, harvest time is factory set at 3 1⁄2 minutes, but is adjustable.Inlet water valve, water flow in g.p.m. = 1 CUT IN CUT OUTCube size control, reverse acting temperature range . . . . . . . (00F. to +250F.)High pressure safety, (air cooled) . . . . . . . . . . . . . . . . . . Manual 450High pressure safety, (water cooled) . . . . . . . . . . . . . . . . Manual 350Fan Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . 210 193Bin or Ice level Control Maximum Full Height: . . . . . . . . . . . . . . . . . . . . 8\" from the base of the ice machine. Partial Fill Setting: . . . . . . . . . . . . . . . . . . . . . . 21\" - 22\" from the base of the ice machine. Maximum Storage Bin Interior Height: . . . . . . . . . . . 8’ from the base of the ice machineCHARACTERISTICS: This machine uses R22.AIR COOLEDFreeze cycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . . 280-240 PSIGAverage Suction Pressure at the end of Freeze: . . . . . . . . . . 22-20 PSIGAverage Freeze cycle time . . . . . . . . . . . . . . . . . . . . . 17 minutesAverage Amps . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 (single phase ) 7.8 (3 phase)Harvest CycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . 120-130 PSIGAverage Suction Pressure during harvest . . . . . . . . . . . . . 70-75 PSIGAverage Harvest Time: . . . . . . . . . . . . . . . . . . . . . . . 2.25 minutesAverage Amps . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 (single phase)WATER COOLEDFreeze cycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . . 225Average Suction Pressure at the end of Freeze: . . . . . . . . . . 20-2Average Freeze cycle time . . . . . . . . . . . . . . . . . . . . . 17Average Amps . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 (single phase) 7 (three phase)Harvest CycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . . 120-130 PSIGAverage Suction Pressure during harvest . . . . . . . . . . . . . 75-85 PSIGAverage Harvest Time: . . . . . . . . . . . . . . . . . . . . . . . 2.25 minutesAverage Amps . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 (single phase) September 1993 Page 19

CMS1202SERVICE DIAGNOSIS: Electrical and/or AdjustmentsSYMPTOM POSSIBLE CAUSE PROBABLE FIXNothing operates Bin level control holding machine off Bin is full - use some ice.Makes thick ice/freezes up Check ice level control circuit, seeRuns, makes no ice page 22.Long freeze cycle No Power Reconnect powerCubes too smallCubes too large High pressure control open Reset, check machine High temperature cut out open Hot gas valve leaks thru, replace P. C. Board Open Replace board Master switch open Test/replace Timer contacts open Replace timer Harvest cycle too short Adjust timer Water inlet valve restricted Clean or replace valve Low water pressure Check water filter or supply Hot gas valve defective Replace hot gas valve Water reg. valve (water cooled) leaks Replace water reg. valve through Low refrigerant charge Locate leak, repair, replace drier, evacuate and weigh in nameplate charge. Air intake temperature too high (air Reduce room temperature cooled) Sump covers out of position Re-position sump covers Cubes too small Adjust cube size Cube size control stuck open Replace cube size control Pump problem or water leak in Check water system and pump reservoir Water inlet valve either lets in no Replace inlet water valve water or leaks through Low refrigerant charge Locate leak, repair, replace drier, evacuate and weigh in nameplate charge. Timer stuck Replace timer Relay does not energize; unit stuck in Replace relay harvest Water inlet valve leaks through Replace inlet water valve Dirty condenser Clean condenser Air intake temp. too high Reduce room temperature Water temperature too high Advise user Cube size set wrong adjust cube size Cubes size control stuck closed Replace cube size control Water inlet valve leaks through Replace inlet water valve and adjust cube size control September 1993 Page 20

CMS1202SERVICE DIAGNOSIS: Refrigeration and/or MechanicalSYMPTOM POSSIBLE CAUSE PROBABLE FIXPoor harvest Too short harvest time Check and adjust harvest time Restriction of incoming water Check supply, filter, strainer and valveUnit cycles off during freeze or Hot gas valve does not open Check for power to the coil, check forharvest not opening, replaceLow capacity Not enough refrigerant Locate leak, repair, replace drier, evacuate and weigh in nameplateUnit runs out of water Cube size too small charge.Unit shuts off before bin is full Hi temperature switch opens and Adjust with cube size controlUnit does not shut off closes Hot gas valve leaks thru, replace it Loose connection on PC board High head pressure, from dirty Check and replace P C board condenser, faulty fan motor, or fan Clean condenser, repair fan motor or control control Non condensable gas in the system Purge system, evacuate and weigh in Poor air circulation or extreme hot nameplate charge location Relocate the cabinet; or provide Overcharge of refrigerant ventilation Evacuate and weigh in nameplate Cube size too big, unit runs out of charge water before harvest Adjust cube size control Inlet water valve leaks thru Hot gas valve leaks thru Replace valve At the end of the freeze cycle there Reservoir leaks should be frost on the evaporator end Inlet water valve restricted of the hot gas tubes, if not replace the Short harvest cycle hot gas valve Water pressure too low Repair leak Something blocking transducer Clean or replace valve Transducer is wet Adjust timer Check supply Control set on partial Remove blockage Ice level control failiure Remove transducerand shake screen Timer stuck; does not turn dry. Set control to full. Check circuit, see next page. Replace timer September 1993 Page 21

CMS1202SERVICE DIAGNOSIS: Ice Level Control CircuitCONDITION DETERMINE CAUSE PROBABLE CORRECTIONIce Machine does not run, it haspower to it, the high pressure control A. Listen for a ticking sound from If no noise, go to C. If there is ais closed, the on/off switch is set to transducer. noise, check for a light on the boardON. (models built after 4/93). If there is a light on, check relay contacts N.O.Machine runs, makes ice, switches and COM. The contacts should beon and off, but ice level cannot be CLOSED. If closed, go to D. If not,controlled. replace the board. If light is off, orMachine runs, but will not shut off. prior model, go to B. B. Open bin door and twist If the inside of the transducer (above transducer 1/4 turn and pull out. DO screen) was wet, replace it. Set bin NOT UNPLUG with power level to FULL and aim at an object connected. Examine the transducer, about 1-3 feet away. Machine should the inside must be clean and dry. restart, if not go to D. C. Check power to bin level control Should be 12 volts from transformer, board. if not replace transformer. If there is power go to D. D. Disconnect electrical power and If machine does not start go back to test ice machine circuit by attaching a machine circuit. If machine starts, jumper wire between bin thermostat disconnect electrical power, remove posts on circuit board part no. jumper wire and reconnect electrical 12-1912-01 (the circuit board with the power. Then go to E. timer on it). Reconnect power. E. Transducer or ice level board Replace transducer. Set bin level to assembly defective. FULL and aim at an object about 1-3 feet away. Machine should restart. If this does not repair unit, replace the board. Ice level switch may be defective. On Replace ice level switch boards with a light, check by moving switch & watching light. Board relay stuck closed. Check If COM and N.O. are closed when relay. power is off, replace board. If open, go to B above.PARTIAL VIEW OF PLUG - INCIRCUIT BOARD RELAY 12-1912-01 TIMER BIN THERMOSTAT Electrical Shock Hazard Can Cause Personal Injury. POSTS MENTIONED IN “D” ABOVE Disconnect Power Before Servicing. Bin Thermostat Posts at Line Voltage. September 1993 Page 22

CMS1202REMOVAL AND REPLACEMENT Cube Size ControlWater Distributor Tubes And Manifold Tubes To remove the cube size control:To remove the water distributor tube and manifoldtube: Electrical Shock1. Remove the front panel. Hazard.2. Slide the water distributor tube to the front about Electrical shock can1/8-inch along the top of the evaporator plate, until cause personal injury.the water distributor tube can be unsnapped from Disconnect powerthe flexible notch and lifted upward. before begining to service components DISTRIBUTOR TUBE 1. Remove front panel. 2. Remove cover from control box. 3. Trace capillary tube, from the cube size control to the refrigerant suction line. 4. Remove the coiled capillary tube bulb from the tube well on the suction line. 5. Remove electrical leads from the cube size control. NOTCH IN CONTROL BOX3. Unsnap and disconnect water distributor tubes REMOVAL OF THE CUBE SIZEfrom the water manifold section. To replace the CUBE SIZE CONTROL CONTROLwater distributor tubes and manifold tubes, reversethe removal procedure. BE SURE the notches in 6. Remove screws and pull the capillary tubethe water manifold tubes properly engage the through the notch in the back of the control box.alignment keys in the tee. BE SURE the water Remove the cube size control. To replace the cubedistributor tube is securely fastened at the notch at size control, reverse the removal procedure.both sides of the evaporator plate. Check identicalattachment for the left water distributor tube andnotch; also, that the distributor/manifoldconnections at the top center of each evaporatorplate is snug against the top of the plate.September 1993 Page 23

CMS1202 Inlet Water Solenoid Valve Assembly To remove the inlet water solenoid valve assembly:REMOVAL AND REPLACEMENT 1. Shut OFF water supply to machine. 2. Loosen and remove outlet water line from the Electrical Shock inlet water solenoid valve assembly. Hazard. Electrical shock can INLET WATER VALVE cause personal injury. Disconnect power before STRAINER begining to service components 3. Remove screws and pull the water solenoid valve out to gain access.Water Pump 4. Pull electrical cord from solenoid coil terminals. 5. Remove inlet water fitting from the water1. Remove front panel. solenoid valve. To replace the inlet water valve assembly, reverse the removal procedures.2. Unplug water pump electrical connection. Bin Ice Level Control Circuit Board 1. Disconnect Electrical Power before removing3. Drain water reservoir. circuit board. 2. Remove front panel.4. Use corbin clamp pliers to loosen and slide 3. Remove control box cover.corbin clamps on hoses away from pump. 4. Remove wires from circuit board connections. 5. Unlock circuit board fasteners by twisting 1/25. Remove screws retaining pump to bracket. turn. 6. Pull circuit board of off fastener posts.6. Pull pump out of ice machine. 7. Reverse to reassemble, refer to wiring diagram as needed.7. Reverse to reassemble.8. Replace front panel.8. Reconnect electrical power.Transducer1. Disconnect electrical power BEFORE removingtransducer.2. Remove front panel, and locate transducer nearthe back of the cabinet.3. Twist inner portion of transducercounter-clockwise and pull up gently.4. Unplug transducer and remove from themachine.5. Reverse steps 1-5 to reassemble.September 1993 Page 24