Service Manual - MCM1462

MCM1462INTRODUCTIONTo 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 2Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3For the Installer 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 located in thecenter of this manual, printed on yellow paper.This manual was printed on recycled paper. April, 1993 Page 1

MCM1462 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 MCM1462 will fit the MDB900 ice storage bin(48\" wide). It will double-stack with kit KSMCM48. Scotsman assumes no liability or responsibility of any kind for products manufactured by ScotsmanThe stacking kit includes: that have been altered in any way, including the use of any parts and/or other components not •Relay box and wires to interconnect bin controls. specifically approved by Scotsman. •Stainless steel panel bracket to retain lower unit Scotsman reserves the right to make design front panels. changes and/or improvements at any time. Specifications and designs are subject to change •Gasket material to seal joint between cabinets. without notice. •Heavy duty legs for installation on the bin. Back View, Water Cooled Back View, Air CooledModel Number Dimensions (w/o bin) Basic Electrical Minimum Circuit Maximum Refrigerant Condenser W\" x D\" x H\" Ampacity* Fuse Size Charge TypeMCM1462AS-3A 48 x 243⁄8 x 271⁄2 208-230/60/3 20.2 20 60 oz. R-22 AirMCM1462WS-3A 48 x 243⁄8 x 271⁄2 208-230/60/3 19.5 20 64 oz. R-22 Water* Minimum Circuit Ampacity is used to determine wire size and type per the National Electric Code. If thenumbers listed above are not the same as the nameplate, go by the nameplate.Power cord is kit number: MPC. Caster kit is number: KBC9.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 psiVoltage -5% +10% April, 1993 Page 2

MCM1462FOR 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 minimum Use bolts and straps found on the back of theof 6\" must be allowed at the back for air circulation icemaker to secure the ice machine to the bin.on air cooled models. Try to avoid hot, dirty and When alignment and leveling are completed,crowded locations. Be sure that the location for the tighten the bolts to secure the mounting straps.machine is within the envrionmental limitations. Remove the front panels, and remove the evaporator shipping brackets and hardware.Storage Bin:Tip the storage bin on its back, using parts of thecarton to protect the exterior finish. Install thecasters, 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. Single ice machine on bin: Use caster kit KBC9.After mounting the casters, position the ice storagebin in the selected location:Two ice machines on a bin require stacking kitKSMCM48. Do NOT use casters on units with twoice machines on one bin.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 casters. Stackedunits use non-adjustable legs, and must be leveledwith shims. Select a well ventilated location for aircooled models.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.4. Install the bin bumpers onto the top edge of thebin, so that they hang-over the back.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.April, 1993 Page 3

MCM1462FOR THE INSTALLER: Location & AssemblyStacking Instructions A stainless steel bracket (from the kit) must be attached to the top of the bottom machine beforeA stacking kit, KSMCM48, is required to the units are stacked.interconnect the ice level controls, seal thefreezing compartments, support the bin with heavy Place strips of gasket material (from the stackingduty legs, and to retain the top edges of the kit) on the top edges of the bottom unit’s freezingbottom unit’s front panels. compartment.Follow the installation instructions of the stacking Carefully lift the uncrated top unit onto the bottomkit, but in general: one and align the two cabinets. Use of a mechanical lift is recommended for this step.Before adding a unit, the casters must be replacedwith heavy duty legs. Casters must not be used At the back of the two icemakers, bolt the upperwith two ice machines on one bin. icemaker cabinet to the lower icemaker cabinet using the mounting straps and bolts from theWhen stacking two units, remove the top panel hardware package.and the evaporator cover from the lower icemaker.(The top removed from the lower icemaker will no Add the relay box to interconnect the two icelonger have any function.) machine’s bin control circuits.STACKING PANEL RETAINING STRIP EVAPORATOR COVER April, 1993 Page 4

FOR THE ELECTRICIAN MCM1462SEE 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 may DETAIL OFbe responsible for serious damage to the JUNCTION BOXicemaker. GROUND SCREW ELECTRICALPOWER SUPPLY HAND DISCONNECT SWITCH JUNCTION BOXELECTRICAL CONNECTIONS, WATER COOLED BACK VIEW OF UNIT ELECTRICAL CONNECTIONS, AIR COOLED April, 1993 Page 5

MCM1462 CONNECTIONS:FOR THE PLUMBER All drains are gravity type and must have a minimum of 1/4-inch fall per foot on horizontalFOLLOW ALL LOCAL CODES: runs. The drains to be installed to conform with the local plumbing code. Install a vertical open vent onThe recommended water supply line is a 3/8-inch drain line high point to insure good draining. TheO.D. copper tubing with a minimum operating ideal drain receptacle is a trapped and vented floorpressure of 20 PSIG and a maximum of 80 PSIG. drain. Recommended bin drain is 5/8 inch O.D. copper tubing and should be vented and runConnect to cold water supply line with standard separately. Insulation for high humidity areas isplumbing fittings, with shut off valve installed in an recommended.accessible place between thewater supply and thecuber. ln some cases a plumber will be required. Water Cooled models require another inlet connection to the condenser, and another drain forWater Limitations: the condenser. The drain must be separate from the bin drain.An ice machine is a food manufacturing plant, ittakes in a raw material, water, and turns it inot a Bin Drain: The bin drains from the bottom, andfood product, ice. The purity of the water is very needs no vent unless there is a long horizontal run.important in obtaining pure ice and in maximizingproduct life. It is generally better to filter the water, Terminate drains above the drain receptacle withalthough there is no one filter that will cure all the proper air gap per local code.water problems. A good filter combined with apolyphosphate feeder gives about the best overall The ice machine sump drain is 3/4\" FPT. Thereperformance. must be a vent at this connection for proper sump drainage.Cold, potable water must be supplied to the waterinlet fitting. AIR COOLED WATER COOLEDOPTIONAL CONNECTIONS CONNECTIONS FILTER 3/8\" MALE CONDENSER CONDENSER INLET DRAIN FLAREPOTABLEWATER HAND SHUT OFF VALVESUPPLY 3/4\" FPT AIR GAP SUMP DRAIN VENT BIN BETWEEN MUST BE DRAINDRAIN LINES VENTED AND BUILDING DRAIN BACK VIEW OF WATER SUPPLY AND DRAIN CONNECTIONPLUMBING HOOK UP April, 1993 Page 6

MCM1462FINAL CHECK LIST1. Is the cabinet in a room where ambienttemperatures are within the minimum andmaximum temperatures specified?2. Is there at least six inches clearance at the leftand back sides of the cabinet for proper aircirculation? (Air Cooled models)3. Has water supply pressure been checked toinsure a minimum of 20 PSIG and a maximum of80 PSIG operating pressure?4. Is the cabinet level?5. Check that any shipping material has beenremoved from inside the cabinet.6. Check that the reservoir is properly secured tothe bottom of the evaporator plates.7. Have all electrical, water and drain connectionsbeen made?8. Is the water supply line shut off valve installedand electrical wiring properly connected?9. Check all refrigerant lines and conduit lines, toguard against vibration or rubbing and possiblefailure.10. Have the bin and cabinet been wiped clean?11. Has the Manufacturers Registration form beenproperly filled out? Check for correct model andserial numbers from Serial nameplate, then mailthe completed card to the SCOTSMAN factory.12. Has the owner/user been given the ServiceManual and instructed how to operate andmaintain the icemaker?13. Has the owner been given the name andtelephone number of the authorized SCOTSMANService Agency serving him?April, 1993 Page 7

MCM1462 FRONT VIEW OF TIMERINITAL START UP ACTUATOR MICROSWITCH BUTTON1. Remove the front panels by removing screws atthe base and pulling out. CAM2. Remove two screws and the control box cover. HARVEST PORTION3. Check that the two switches on the control box,the ICE-OFF-WASH rocker switch and the FREEZECOMPRESSOR ON-OFF toggle switch are in the PORTIONOFF position. CONTROL BOX4. OPEN the water supply line shut off valve. CUBE SIZE5. Inside the control box is the shaft of the timer CONTROLand the switch assembly. Rotate the shaft of thetimer and switch assembly clockwise to start the TIMERtimer. The timer starts when the actuator arm onthe microswitch drops off outer cam into cam slot.See “Front View of Timer”.6. Move the ICE-OFF-WASH rocker switch, to theICE position.7. Observe water fill cycle: Water pump operatesand water inlet solenoid valve OPENS, incomingwater flows from the valve through the tubing, thereservoir fills and excess water is overflowedthrough the stand pipe. This continues through theharvest cycle (about 3 and a half minutes). Whenthe freeze cycle is started, the timer and relay willclose the water inlet solenoid valve and the waterfill cycle is complete. If the sump is not full, rotatethe timer once again to repeat the harvest cycle.The water pump should be pumping water throughthe tygon tubes up to the water distributor at thetop of each evaporator plate, where water isuniformly dispensed and cascades down bothsides of the evaporator plates and drains back intothe sump assembly for recirculation.8. When the sump has filled, move the compressorON-OFF toggle switch, to the ON position.9. Check operation of the freezing cycle: Thecompressor is operating.The icemaking processbegins; feeling the metal parts of the evaporatorplate reveals cold temperature, very shortly icebegins to form. Tubing will become frosted at thetop of the evaporator plate. The first cycle will bethe longest, after that freezing time will rangebetween 12 and 15 minutes. Longer time fortemperatures above 70 degrees F. and shortertime required when temperatures are below70-degrees F. Average complete cycle time isabout 16 minutes.April, 1993 Page 8

INITAL START UP MCM146210. Check Cube Size CUBE SIZE DIAGRAMThere is exactly enough water available in the JUST RIGHTreservoir to make one full sized batch of cubes.The water pump may pick up some air at the end When the cubes are the correct size,of the freezing cycle: this is normal. If the water they will be connected togetherpump runs out of water before the end of freeze, vertically, and drop off in strips.the cube size control may be set too cold, or thewater system may be leaking water. Make them as large as the reservoir water available will allow.To produce SMALLER sized ice cube: TOO SMALLLocate cube size control knob, in the front of thecontrol box. Rotate one eighth of a turnCOUNTER Clockwise. Observe size of the ice inthe next ice cube harvest and adjust in one eighthturn or less increments, until correct ice cube isachieved.To produce LARGER ice cube:Locate cube size control on the front of the controlbox Rotate the adjusting knob one eighth of a turnClockwise. Observe size of ice cubes in the nextcube harvest and adjust in one eighth turn or lessincrements, until correct ice cube size is achieved.CONTROL BOX 11. Bin Ice Level Control Operation: With the icemaker in the harvest cycle, place something CUBE SIZE directly below the transducer socket. The machine CONTROL should switch off at the END OF THE HARVEST CYCLE. Within seconds after removal of the obstruction, the icemaker will restart. This control has four postions: full, three quarter, one half, and one quarter. It will not fill up closer than 8\" from the bottom of the ice machine. Note: The unit will make one batch of ice when full if switched Off and then On. 12. Wash out the bin with clean, potable water. 13. Replace control box cover and all cabinet panels and screws. 14. Thoroughly explain to the owner/user the significant specifications of the icemaker, the start up and operation, going through the procedures in the cleaning instructions. Answer all questions about the icemaker by the owner; and inform the owner of the name and telephone number of the local authorized SCOTSMAN Distributor, or service agency. April, 1993 Page 9

MCM1462 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.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 April, 1993 Page 10

MCM1462HARVEST 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 April, 1993 Page 11

MCM1462 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 three and one halfRelay 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 (air cooled) or 350 PSIG (waterwhen the bin thermostat opens during the freezing cooled). Found below the control box.cycle. The bypass action ensures full-sized icecubes with each harvest cycle and prevents shortcycling on the bin thermostat control.CONTROL BOX CUBE SIZE CONTROL RELAY TIMER AND MICROSWITCH ICE/OFF/WASH SWITCH BIN ICE LEVEL SELECTOR SWITCH April, 1993 Page 12

COMPONENT DESCRIPTION MCM1462Bin 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.The 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. ICE/OFF/WASH SWITCH THE USER CAN SELECT THE AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. BIN ICE LEVELSELECTOR SWITCH SOUND WAVES FULL 3⁄4 1⁄2 1⁄4 April, 1993 Page 13

MCM1462 WATER DISTRIBUTORSCOMPONENT DESCRIPTION SUMPWater Inlet Solenoid Valve DRAIN CAPThe water inlet solenoid valve fills the sumpassembly with water. Extra water overflows out theoverflow standpipe of the sump. This action fillsand rinses the sump during each harvest cycle.The flow rate is 1 g.p.m.Water Distribution SystemThe water distribution system functions to evenlysupply water to all cells of the evaporator plates.The water pump pumps water from the sump upthe vertical tygon tube to the tee. From there wateris channeled through the water manifold to thewater distributors, above each evaporator plate,and from six holes within each distributor, waterflows to the cells of each side of the evaporatorplates. Gravity flow returns the unfrozen excessportion of water to the sump reservoir forrecirculation.Hot Gas Solenoid ValveThe hot gas solenoid valve opens only during theharvest cycle, to divert the hot discharge gas fromthe compressor, by passing the condenser andcapillary tube, for direct flow to the evaporatorplates to release ice cubes from the ice cubemolds.Fan Pressure Control - Air-Cooled SUMP STANDPIPEModels only.ln both freeze and harvest cycles, thefan pressure control functions tomaintain a minimum dischargepressure by cycling the fan on and off. OPTIONALThe approximate C.I. is 210 PSIG and WATER FILTERC.O. is 193 PSIG.Strainer HAND VALVEA water strainer is located in thepotable inlet water line before thewater inlet solenoid valve. Clean thewater strainer frequently. PUMP COMPONENT LOCATION April, 1993 Page 14

MCM1462CLEANING/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////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 Hazard. 9. Let the unit operate for 30 minutes. Electrical shock can cause personal injury. During the wash cycle, if the machine runs out of Cleaning procedures are solution, mix 2 more gallons of solution per step 6, done with the power ON. refill the sump and continue the wash cycle for the remainder of the 30 minutes.the WASH/OFF/ICE switch to OFF. 10. Move the WASH/OFF/ICE switch to the OFF3. Remove the control box cover, and rotate the position.shaft of the timer and switch assemblyCLOCKWISE advancing to the freezing cycle. 11. Remove the reservoir drain cap and drain the(Beginning of the higher part of the cam against cleaning solution from the sump. Replace the drainthe microswitch). cap.4. Open the ice storage bin door and empty the bin 12. Rotate the shaft of the timer and switchof ice. assembly CLOCKWISE to the harvest position (low part of the cam against microswitch). Move5. Remove the hose clamp, rubber cap and drain the WASH/OFF/ICE switch to the ICE position toall the water from the sump assembly into a start the Harvest cycle.container. If, after completing this procedure, one or moreReplace the rubber cap and hose clamp. evaporator plates does not have a full flow of water for each vertical column of cubes, shut down the operation and remove and clean all water 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. April, 1993 Page 15

MCM1462 CLEANING AIR COOLED CONDENSER CONDENSERCLEANING MUST BEAIR COOLED CONDENSER CLEAN1. Disconnect electrical power. FILTER The fan blade can 3. After all the scale has been removed, rinse all of cause personal injury. the surfaces inside the bin with clean, potable Disconnect power water. before begining to clean condenser. To sanitize the bin and ice machine interior.2. Remove front panel. Use an approved sanitizer and follow the directions and warnings of that sanitizer or use the3. Clean or replace the air filter. following instructions for use of household bleach, if it meets local codes:4. Check to see that the inside of the condenser isclean; light should be visible through the fins. If not 1. Mix a sanitizing solution of 1 ounce ofclean the internal parts by vacuum, pressure household bleach to 2 gallons of water.washer and/or coil cleaner. 2. Using clean rubber gloves and a clean cloth,ICE STORAGE BIN wipe all interior surfaces of the ice machine and ice storage bin with the santizing solution.The interior liner of the bin is in contact with a food Immerse any small parts in the sanitizing solutionproduct: ice. The storage bin must be cleaned and wash the parts, flushing the solutionregularly to maintain a sanitary environment. thoroughly in, over and through all parts andOnce a week cleaning with soap and water, a hot surfaces of the parts being cleaned.water rinse and an air dry is a basic procedure. 3. Allow to air dry.Scale that may form on the plastic liner can beremoved by scrubbing the surface with a mixtureof Scotsman Ice Machine Cleaner and hot water.Remove any scale prior to sanitizing.To Remove Scale:1. Mix a cleaning solution of 4 ounces of ScotsmanIce Machine Cleaner to 4 pints of hot (950F. to1100F.) water.2. Using rubber gloves, dip a nylon scouring padinto the cleaning solution, and scrub the scale offof the liner. 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.April, 1993 Page 16

ADJUSTMENTS MCM1462Adjustment Of The Cube Size Control Adjustment Of The Water Regulator - Water Cooled Only//////////////////////////////CAUTION//////////////////////////////////// The system discharge pressure should be about 220 PSIG.BEFORE adjusting the cube size control, check The water regulator varies the flow of waterother possible causes for cube size problems, through the condenser depending upon therefer to Service Diagnosis section. DO NOT refrigeration system discharge pressure. If moreperform adjustment when a new cube size control heat must be discharged, and the pressure startsis installed until the control bulb has been properly to rise, the valve opens slightly, allowing moreinstalled in the tube well, and the icemaker has water to flow through the condenser, keeping thebeen through a complete freezing and harvest pressure nearly constant.cycle. To Adjust/////////////////////////////////////////////////////////////////////////////// •To increase, rotate the adjustment stem counterAdjustment of the cube size control is available tochange the cubes to the correct size, see INITIAL clockwsie (screw it out).START UP. •To decrease pressure, rotate the adjustmentTo produce LARGER sized ice cubes: stem clockwise (screw it in).1. Locate the cube size control, on the front of thecontrol box. ADJUSTMENT OF THE WATER2. Rotate the adjusting knob one-eighth of a turn REGULATORClockwise. ADJUSTMENT3. Observe size of ice cubes in next ice cube STEMharvest and, if needed, repeat step 2 above untilcorrect ice cube size is achieved.To produce SMALLER sized ice cubes:1. Locate the cube size control, on the front of thecontrol box.2. Rotate the adjusting knob one-eighth of a turnCOUNTER Clockwise.3. Observe size of ice cubes in next ice cubeharvest and, if needed, adjust again until correctice cube size is achieved.April, 1993 Page 17

MCM1462 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. The harvest time may Electrcial power present be reduced if not needed. This will yield more ice in the control box can per day. cause personal injury. Disconnect power before TIMER begining to adjust timer. CAMOne complete revolution of the cam on the timertakes eight minutes. The normal setting is three ADJUSTING TIMERand one-half minutes, as set at the factory. lt is MICROSWITCHimportant that the length of the harvest cycle allowenough time for all the ice cubes to fall from theevaporator. Too short of a time will cause theevaporator to freeze up and stop ejecting ice intothe 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. CLOSE UP VIEW OF TIMER SWITCH ACTUATOR CAMApril, 1993 Page 18

MCM1462SYSTEM SPECIFICATIONSThe following numbers can be used as a guideline when servicing the CMS1402. 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 3.5 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. 3/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15\" from the base of the ice machine 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22\" from the base of the ice machine 1/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30\" 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 . . . . . . . . . . . . . . . . . . . . . 15 minutesHarvest CycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . 120-130 PSIGAverage Suction Pressure during harvest . . . . . . . . . . . . . 70-75 PSIGAverage Harvest Time: . . . . . . . . . . . . . . . . . . . . . . . 3 and a half minutesWATER COOLEDFreeze cycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . . 225 PSIGAverage Suction Pressure at the end of Freeze: . . . . . . . . . . 22-20 PSIGAverage Freeze cycle time . . . . . . . . . . . . . . . . . . . . . 15 minutesHarvest CycleAverage Discharge Pressure at: 900/700 . . . . . . . . . . . . . 120-130 PSIGAverage Suction Pressure during harvest . . . . . . . . . . . . . 70-75 PSIGAverage Harvest Time: . . . . . . . . . . . . . . . . . . . . . . . 3 and a half minutes April, 1993 Page 19

MCM1462SERVICE 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, check for water interuption if water cooled. 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 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 April, 1993 Page 20

MCM1462SERVICE 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 not set on full 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 April, 1993 Page 21

MCM1462SERVICE 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. Remove front panel(s), 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 PLUG - IN Electrical Shock Hazard VIEW OF RELAY Can Cause Personal Injury. CIRCUIT Disconnect Power Before BOARD BIN THERMOSTAT Servicing.12-1912-01 Bin Thermostat Posts at April, 1993 Line Voltage. TIMER Page 22 POSTS MENTIONED IN “D” ABOVE

REMOVAL AND REPLACEMENT MCM1462Water Distributor Tubes And Manifold Tubes Cube Size ControlTo remove the water distributor tube and manifold To remove the cube size control:tube:1. Remove the front panel. Electrical Shock 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.April, 1993 Page 23

MCM1462 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 Hazard. inlet water solenoid valve assembly. Electrical shock can cause personal injury. INLET WATER VALVE Disconnect power before begining to STRAINER service components 3. Remove screws and pull the water solenoidWater Pump valve out to gain access.1. Remove front panel. 4. Pull electrical cord from solenoid coil terminals.2. Unplug water pump electrical connection. 5. Remove inlet water fitting from the water3. Drain water reservoir. solenoid valve. To replace the inlet water valve4. Use corbin clamp pliers to loosen and slide assembly, reverse the removal procedures.corbin clamps on hoses away from pump. Bin Ice Level Control Circuit Board5. Remove screws retaining pump to bracket. 1. Disconnect Electrical Power before removing6. Pull pump out of ice machine. circuit board.7. Reverse to reassemble. 2. Remove front panel.8. Replace front panel. 3. Remove control box cover.8. Reconnect electrical power. 4. Remove wires from circuit board connections.Transducer 5. Unlock circuit board fasteners by twisting 1/21. Disconnect electrical power BEFORE removing turn.transducer. 6. Pull circuit board of off fastener posts.2. Remove the front panel and locate the 7. Reverse to reassemble, refer to wiring diagramtransducer socket. as needed.3. Twist inner portion of transducercounter-clockwise and push up gently.4. Unplug transducer and remove from themachine.5. Reverse steps 1-4 to reassemble.April, 1993 Page 24

MCM1462REFRIGERATION SERVICEGeneral: equals minimal refrigerant discharged into the air. •Scotsman recommends that any work on the •If hi side pressure must be checked, use a refrigeration system only be done when it is certain that the system needs repair. quick connect at the end of the discharge hose to minimize the release of refrigerant, J/B •Refrigerant should not be added except as a Industires part number A33000 works well. way to determine the proper operation of the •Scotsman’s schrader valve caps must be product. If the system was low on refrigerant, there is a leak, and it must be found and tightened to 70 inch - pounds to insure that the repaired. valves will not leak. •Although this system uses R-22, it should not •If using recycled refrigerant, it must meet ARI be wasted to the atmosphere, but reclaimed. spec 700 or have been cleaned by a machine capable of attaining ARI spec 700. •This system has a critical charge, it must be If the refrigeration system must be serviced, the recharged with the correct amount of refrigerant quality of service must insure that there will not be as listed on the nameplate of the ice machine, a repeat failure, as repeat failures will cause or performance will suffer. refrigerant to be discharged into the air by the failure or when the failure is corrected: •Anytime the refrigeration system has been •If there has been a compressor burn out, check opened, the dryer should be replaced. for acid in the oil. If acid is indicated, extra steps •When brazing the tubing connections to the hot must be taken to clean up the system. gas valve or thermostatic expansion valve, the •Never use refrigerant, such as R-11, to clean component must be protected by heat sink material. up or flush out a refrigeration system. When system clean-up is required, the use of suctionSpecifically: line filter-dryers and liquid line filter-dryers are recommended.Recover, reclaim or recycle refrigerant. Themethod chosen is up to the service company. •Always replace the dryer when repairing a leakThere are various mechanical devices that may beused to recycle refrigerant at the field level, or replacing a refrigeration component.however, Scotsman requires that any refrigerantplaced into a Scotsman ice machine meet ARI •Evacuate the system with a good vacuumspec 700. Reclaim programs are available thrumost refrigerant wholesalers. pump to 500 microns or less. If the triple evacuation method is used, the vacuum shouldUse conservation minded service procedures: be broken each time with dry nitrogen, not refrigerant. Evacuation must be from both sides •Refrain from checking refrigeration pressures of the system. without reason. There are many ways to •Weigh in or measure in the nameplate charge. determine the proper operation of a Scotsman ice machine without using refrigerant gauges. Recharge into the high side. Visual inspection of the water system, observation of the ice formation, amp draw, •Check for leaks with a high quality, electronic voltage, and other techniques will lead to proper diagnosis. Scotsman also recommends that, at leak detector. Halide torches will not locate the the time of initial start up, gauges not be used. very small leaks. •If gauges must be used, do not always check •Scotsman’s schrader valve caps must be the high side pressure. If the condenser is clean tightened to 70 inch - pounds to insure that the and seems to be operating correctly, it most valves will not leak. likely is. The low side pressure is much more important on an ice machine than is the high If an ice machine is to be discarded and still side. contains refrigerant, Scotsman recommends that the refrigerant be recovered, reclaimed, or •If gauges must be used, use very short hoses. recycled so that it is not discharged into the air. Minimal refrigerant discharged into the hoses April, 1993 Page 25