Service Manual - CMS1202R

CMS1202RINTRODUCTIONTo 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Freeze Cycle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Harvest Cycle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Parts Lists and Wiring Diagrams are locatedin the center of this manual, printed onyellow paper.September 1993 Page 1

CMS1202R A remote condenser and precharged tubing kit are required to assemble this ice system.FOR THE INSTALLER The normal finish for the machine is enamelThe CMS1202R will fit the following Scotsman ice sandalwood. An optional stainless steel panel kitstorage bins: (SPKCM1402) can be field installed. It contains a stainless steel top, left side panel, an overlay right •BH900 side panel, and front panel. •BH1000 (with bin top KBT21) •BH1360 This manual covers both A and B models (B models have 2 front panels).and it will stack (with kits) onto the following icemachines: •CMS1402 (with stacking kit KSCMS48) •CMS1202 (with stacking kit KSCMS48)Scotsman Ice Systems are designedand manufactured with the highestregard for safety and performance.They meet or exceed the standards ofU.L., N.S.F., and C.S.A.Scotsman assumes no liability orresponsibility of any kind for productsmanufactured by Scotsman that havebeen altered in any way, including theuse of any parts and/or othercomponents not specifically approvedby Scotsman.Scotsman reserves the right to makedesign changes and/or improvementsat any time. Specifications anddesigns are subject to change withoutnotice.Model Number Dimensions Basic Refrigerant Minimum Maximum Refrigerant Condenser (without bin) Electrical W\" x D\" x H\" Type Circuit Fuse Charge** Type Ampacity* Size R-22CMS1202RE-3B 48 x 243⁄8 x 271⁄2 208-230/60/3 R-22 15.2 20 256 oz. Remote AirCMS1202RE-32B 48 x 243⁄8 x 271⁄2 208-230/60/1 R-22 21.2 30 256 oz. Remote Air* Minimum Circuit Ampacity is used to determine wire size and type per the National Electric Code.** The unit is shipped with the full charge in the receiver. For re-charging purposes, if the nameplate chargeis different than this number, go by the nameplate.Use Scotsman remote condenser RC1422. Use precharged tubing kit RT2225 (25’) or RT2240 (40\").This ice system (except remote condenser) 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% September 1993 Page 2

CMS1202RFOR THE INSTALLER: Location & AssemblyLocation:After uncrating and inspection, the unit is ready forinstallation. It is important that the machine beinstalled in a location where it has enough spacearound it to be accessible for service. Try to avoidhot, dirty and crowded locations. Be sure that thelocation for the machine is within theenvrionmental limitations.Storage Bin: ICE MACHINE AND BIN ASSEMBLYTip 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 to SHIPPINGside directions by adjusting the leg levelers. BRACKETS3. 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 the icemachine 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

CMS1202RFOR 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 amechanical lift is recommended for this step.STACKING TRIM STRIP - PART OF KSCMS48 STACKING KIT EVAPORATOR COVER September 1993 Page 4

CMS1202RFOR THE INSTALLER: Remote CondenserLocate the condenser as near as possible to Precharged Line Routingthe interior location of the ice maker.Location of the condenser is limited by the specific /////////////////////////////CAUTION///////////////////////////////length of precharged refrigerant tubing supplied forthe application. The pre-charged tubing connects Do not connect precharged tubing until all routingthe icemaker to the remote condenser. The and forming of the tubing is complete. See thecondenser must be above the ice maker. coupling instructions for connecting instructions.Select the best available location, protecting thecondenser from extremes of dirt, dust, and sun. ////////////////////////////////////////////////////////////////////////////Meet all applicable building codes.Roof Attachment: 1. Each set of precharged refrigerant lines consistsInstall and attach the remote condenser unit to the of a 3/8 inch diameter liquid line, and a 1/2 inchroof of the building, using the methods and diameter discharge line. Both ends of each linepractices of construction that conform to the local have quick connect couplings, the end withoutbuilding codes, including having a roofing access valves goes to the icemaker.contractor secure the condenser to the roof. Note: The openings in the building ceiling or wall, REFRIGERANT listed in the next step, are the minimum sizes CONNECTIONS recommended for passing the refrigerant lines through. LOCATE CONDENSER NO LOWER THAN ICE 2. Have the roofing contractor cut a minimum hole for the refrigerant lines of MACHINE 1.75\". Check local codes, a separate hole may be required for the electrical power to the condenser. /////////////////////////////CAUTION///////////////////// /////////// DO NOT KINK OR CRIMP REFRIGERANT TUBING WHEN INSTALLING IT. ////////////////////////////////////////////////////////////////// ////////// 3. Route the refrigerant lines through the roof opening. Follow straight line routing whenever possible. Any excess tubing MUST be retained within the building. 4. Spiral any excess length of pre charged tubing inside the building. Use a horizontal spiral (as illustrated) to avoid any traps in the lines. 5. Have the roofing contractor seal the holes in the roof per local codes. TYPICALINSTALLATION September 1993 Page 5

CMS1202RFOR THE INSTALLER: Coupling Instructions////////////////////////////////CAUTION///////////////////////////////// •The 3/8 inch liquid line goes to the icemakerThe couplings on the sets of precharged lines are fitting marked “liquid line.”self sealing when installed properly. Carefullyfollow the instructions: Final Connections://////////////////////////////////////////////////////////////////////////////// 3. Begin tightening the couplings together by hand, then using two wrenches (it is important thatInitial Connections: ONLY the nut on the precharged lines be turned, the other parts of the couplings must NOT be1. Remove the protector caps and plugs. Wipe the allowed to turn or the process will tear out theseats and threaded surfaces with a clean cloth to diaphragms and they will be loose in thebe certain that no foreign matter remains on them. refrigeraTtIioGnHTsyEsNteINmG) TtiHghEteQnUtIhCeKcCoOuNplNinEgCuTnStil it2. Lubricate the inside of the couplings, especiallythe O-Rings with refrigerant oil. •The 1/2 inch discharge line (schrader valve end) goes to the remote condenser fitting marked “discharge line”. •The 3/8 inch liquid line (schrader valve end) goes to the remote condenser fitting marked SCHRADER bottoms out or a definite increase in resistance is VALVES felt. “liquid line”. 4. Using a marker or pen, mark a line lengthwise from the coupling union nut to the bulkhead. Then•The 1/2 inch discharge line goes to the tighten the coupling and additional 1/4 turn. As the nut turns, the line will show when 1/4 turn is made. icemaker fitting marked “discharge line”. 5. After all connections are made, and after the king valve has been opened, check the couplings for leaks.DISCHARGE LINE LIQUID LINEINSULATION September 1993 Page 6

FOR THE ELECTRICIAN CMS1202RSEE NAMEPLATE for current requirements to The remote condenser is designed to be powereddetermine wire size to be used for electrical from the ice machine. There is a separatehookup. When the cuber and the remote electrical junction box at the back of the ice makercondenser are connected, each must be grounded for the remote condenser. Wire the remoteto the other using the ground screws provided in condenser to the ice maker in accordance withthe respective junction boxes. The cuber then local and national electric codes. All outdoor wiringrequires a solid chassis to chassis earth ground must be in rainproof conduit.wire. See Wiring Diagram.Be certain the cuber is connected to its own The condenser fan motor will run whenever theelectrical circuit and individually fused. Voltage compressor is running.variation should not exceed ten percent of thenameplate rating, even under starting conditions. Electrical connections are made at the rear ofLow voltages can cause erratic operation and may the icemaker, inside the junction box.be responsible for serious damage to theicemaker. All external wiring should conform to the national, state and local electrical code requirements. Usually an electrical permit and services of a licensed electrician will be required.ELECTRICAL CONNECTIONS GROUND SCREW HAND DETAIL OF JUNCTION BOX, 3 PHASE SHOWNDISCONNECT INTERCONNECTING SWITCH WIRES POWER SUPPLY REMOTE CONNECTION September 1993 Page 7

CMS1202R DRAINFOR THE PLUMBER Connections: All drains are gravity type and must have a minimum of 1/4-inch fall per foot onThe recommended water supply line is a 3/8-inch horizontal runs. The drains to be installed toO.D. copper tubing with a minimum operating conform with the local plumbing code. Install apressure of 20 PSIG and a maximum of 80 PSIG. vertical open vent on drain line high point to insure good draining. The ideal drain receptacle is aConnect to cold water supply line with standard trapped and vented floor drain. Recommended binplumbing fittings, with shut off valve installed in an drain is 5/8 inch O.D. copper tubing and should beaccessible place between the water supply and vented and run separately. Insulation for highthe cuber. ln some cases a plumber will be humidity areas is recommended.required. The ice machine sump drain is 3/4\" FPT. ThereWater Limitations: must be a vent at this connection for proper sumpAn ice machine is a food manufacturing plant, it draining.takes in a raw material, water, and turns it into afood product, ice. The purity of the water is veryimportant in obtaining pure ice and in maximizingproduct life. Even though there isn’t one filter thatwill cure all water problems, a good filter combinedwith a polyphosphate feeder gives about the bestoverall performance.POTABLE SUMP DRAIN MUST WATER BE VENTED SUPPLY 3/4\" FPT HAND OPTIONALSHUT OFF FILTER 3/8\" MALE FLARE VALVEAIR GAP BETWEEN VENTDRAIN LINES AND BIN BUILDING DRAIN DRAIN WATER SUPPLY AND DRAIN CONNECTION September 1993 Page 8

FINAL CHECK LIST CMS1202R1. Is the cabinet in a room where ambient LEVELtemperatures are within the minimum and ASSEMBLYmaximum temperatures specified? BIN DRAIN2. Is there clearance at the left and back sides ofthe cabinet for service access?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 been FINAL INSTALLATIONremoved from inside thecabinet.6. Check that the reservoir isproperly secured to the bottomof the evaporator plates.7. Have all electrical, water anddrain connections been made?8. Is the water supply line shutoff valve installed and electricalwiring properly connected?9. Check all refrigerant lines PRECHARGEDand conduit lines, to guard LINESagainst vibration or rubbing andpossible failure. CONNECTED10. Have the bin and cabinet HAND SHUT SUMP DRAINbeen wiped clean? OFF VALVE OPTIONAL11. Has the Manufacturers FILTERRegistration form been properlyfilled out? Check for correctmodel and serial numbers fromSerial nameplate, then mail tothe SCOTSMAN factory.12. Has the owner/user beengiven the Service Manual andinstructed how to operate andmaintain the icemaker?13. Has the owner been giventhe name and telephonenumber of the authorizedSCOTSMAN Service Agencyserving him? September 1993 Page 9

CMS1202R FRONT VIEW OF TIMERINITIAL START UP ACTUATOR MICROSWITCH BUTTONBefore Start Up: CAM1. Check that the ICE-OFF-WASH rocker switchand the Compressor ON-OFF switch are in the HARVESTOFF position. PORTION2. Switch on the electrical power. Electrical power FREEZEmust be supplied to the ice machine for 12 hours PORTIONbefore starting the compressor for the first time. CONTROL BOXThe crankcase heater will now warm up thecompressor’s oil. The oil is warmed to evaporate CUBE SIZEany refrigerant that may have collected in it. If CONTROLthere is refrigerant in the oil when the compressorstarts, the oil will foam and will not lubricate the TIMERcompressor properly, shortening its life. ICE/OFF/WASHDo not start the compressor for the first timeunless the dome of the compressor is warm.Start Up:1. Remove front panel(s) by removing screws atthe base and pulling out.2. Remove two screws and the control box cover.3. OPEN the water supply line shut off valve..4. Open the “king” valve on the receiver.5. Inside the control box is the shaft of the timerand the switch assembly. Rotate the shaft of thetimer and switch assembly clockwise until theactuator arm on the microswitch drops off outercam into cam slot. See “Front View of Timer”.6. Move the ICE-OFF-WASH to the ICE position.7. Check the water fill cycle: For several minutesthe inlet water valve will be open and water willflow 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 step5.Check that the sump covers are snapped in place.Check that the water distributors are properlyseated 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.8. When the sump has filled, move the compressorON-OFF toggle switch, to the ON position. BIN ICE LEVEL SWITCHSeptember 1993 Page 10

CMS1202RINITIAL START UP9. Check operation of the freezing cycle: Ice will CUBE SIZE DIAGRAMbegin to from from the top of the evaporators JUST RIGHTdown. After the first cycle, freezing time will rangebetween 12 and 15 minutes. Longer time fortemperatures above 70oF. and shorter timerequired when temperatures are below 70oF.Average complete cycle time is about 16 minutes.10. After an ice harvest, check Cube Size. There When the cubes are the correct size, they will beis just enough water available in the reservoir to connected together vertically, and drop off in strips.make one full sized batch of cubes. As the waterlevel falls, the water pump may pick up some air at The batch weight will be about 13.5 to 14.5 lb.the end of the freezing cycle, so bubbles in thepump discharge tube at the end of freeze is Note: If the cubes at the bottom rows of some evaporatorsnormal. If the water pump runs out of water before are smaller than others, the size difference does not affectthe end of freeze, the cube size control may be set capacity or performance. However, there should be sometoo cold, or the water system may be leaking water. ice in all cells. If not, contact the Factory.Compare cube size to the \"Cube Size Diagram\"To adjust cube size, locate cube size control in the TOO SMALLfront of the control box, and rotate the adjustmentscrew one eighth of a turn: CAM •COUNTER Clockwise for a SMALLER cube •Clockwise for a LARGER ice cubeObserve size of the ice in the next ice cubeharvest and repeat the adjustment until the correctice cube size is achieved.11. Check Harvest Time. There must be enough ADJUSTINGtime in harvest to defrost all the cubes, but not an HARVESTexcessive amount that will waste capacity. Thelength of the harvest cycle is determined by the TIMEtimer cam positions.If needed, adjust the harvest time so that there are SET SCREWabout 15 seconds of harvest time left after the lastcube has fallen off the evaporators. 12. Check Bin Ice Level Control: With the unit inBecause harvest time varies with the water and air the harvest cycle, place something directly belowtemperatures at the ice machine, colder air and the transducer socket (located in the base just towater will result in faster ice making, but require the left of the evaporators). The machine willlonger harvest cycles. Do NOT adjust harvest switch off at the END OF THE HARVEST CYCLE.time too short or the unit will not harvest all the Within seconds after removal of the obstruction,ice. the icemaker will restart. This control has two positions, FULL and PARTIAL. Full shuts off whenThe harvest time is set by: loosening the set screw ice is 8\" from the bottom of the ice machine. Theon the cam, rotating the shaft so that the opening control will not work on bins taller than 8’.between the cams increase or decrease,retightening the set screw when the cams are in 13. Replace all covers, panels and screws.the correct position. More of an opening between 14. Fill out and mail in the Warranty Registrationthe cams high areas= more harvest time. and Customer Evaluation form. Explain to theAn adjustment of the cube size control may be owner/user the operation, and maintenanceneeded after the harvest time has been changed, requirements of the machine. Be sure to leave theso check cube size again. name and telephone number of the local SCOTSMAN Distributor, or service agency. September 1993 Page 11

CMS1202R Low Temperature Freeze:FREEZING CYCLE OPERATION When the outside air temperature is low, the Head Pressure Regulator will close off the liquid line toWater from the sump assembly is pumped to the the receiver, causing liquid refrigerant to back upwater distributor system at the top of each into the condenser unitl the head pressure buildsevaporator plate. From the water distributor the up to 220 PSIG. While this is occuring, the headwater cascades by gravity over all cells of the plate pressure regulator passes discharge gas into theand to the sump assembly below. receiver to keep the refrigerant flowing.At the beginning of the freezing cycle, the electrical WATER DISTRIBUTIONcircuit is completed to the compressor and thewater pump. The water pump operates INLETcontinuously, through both the freezing cycle and WATERthe harvest cycle. VALVEDuring the freezing cycle, the hot gas solenoid DRAIN RESERVOIRvalve is CLOSED and the water inlet solenoidvalve is CLOSED. When the ice cubes are partiallyformed, the cube size control will sense thetemperature at which it is preset to CLOSE. Thiswill complete the electrical circuit to the timer. Thetimer then controls the remainder of the freezingcycle. The timer will keep the icemaker operatingin the freezing cycle for a selected length of time.This will give the ice cubes time to fully form. afterthat selected length of time, the timer will switchthe icemaker into the harvest cycle, through thecontacts of the timer assembly microswitch. WATER SCHEMATIC REFRIGERATION SCHEMATICSeptember 1993 Page 12

CMS1202RHARVEST CYCLE - HOT GAS BYPASSWhen the timer switches the icemaker into the Pump Down Cycle:harvest cycle, high pressure, high temperature gasrefrigerant being discharged from the compressor When the ice level control is open at the end of theis diverted from the condenser through the hot gas harvest cycle, power is removed from the liquidsolenoid valve into each evaporator plate. During line valve coil, and the pump down cycle begins.this cycle, the refrigerant bypasses the condenser. The compressor will continue to run until the pumpln the electrical circuit, both the compressor and down control, sensing low side pressure, opens atthe water pump are operating and the hot gas 20 PSIG.solenoid valve is energized and OPEN and thewater inlet solenoid valve is OPEN. WATER DISTRIBUTIONThe finished ice cubes are released from the sidesof each evaporator plate by the warming effect of INLETthe hot gas condensing in each evaporator plate WATERand the water cascading over the ice cubes. The VALVEreleased ice cubes drop into the ice storage binbelow. At the end of the harvest cycle, the timercam will push the actuator arm to the microswitchIN. If the ice level control is still CLOSED, a wholenew cycle will begin. If the ice level control isOPEN, the icemaker will begin to shut OFF. DRAIN RESERVOIR WATER SCHEMATIC REFRIGERATION SCHEMATICSeptember 1993 Page 13

CMS1202R Timer - Timer & Switch AssemblyCOMPONENT DESCRIPTION The function of the timer begins when activated by the cube size control. The outer surface, or largeCube Size Control diameter lobe of the timer cam, determines the timer cycle for finish freezing of the ice cubes,This reverse acting thermostat controls the length while the inner surface, or small diameter lobe,of the freezing cycle. It is sensing the temperature determines the 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 to adjustthe 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,plug-in relay is installed directly into a receptacle High Pressure Safety Controlon the printed circuit board in the control box. Therelay functions in part to by-pass the bin This is a manual reset control that shuts down thethermostat control to prevent the icemaker from icemaker, should the discharge pressure evershutting OFF, when the bin thermostat opens reach 400 PSIG. Located below the control box.during the freezing cycle. The bypass actionserves to ensure full-sized ice cubes with each Low Pressure Control (Pump Down)harvest cycle. This pressure control connects power to the compressor contactor coil. Its Cut In is 35 PSIG and its Cut Out is 20 PSIG. Located below the control box.CONTROL BOX CUBE SIZE CONTROL RELAY TIMER & SWITCH September 1993 Page 14

COMPONENT DESCRIPTION CMS1202RBin 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 three parts to the control, theice machine and the top of the ice in the bin. It is transducer, the circuit board, and the ice leveldesigned to control the machine’s ice production to control switch.maintain 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 SWITCHBIN ICE LEVEL THE USER CAN SELECTOR SELECT THE SWITCH AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. SOUND WAVES FULL PARTIAL September 1993 Page 15

CMS1202R Hot Gas Solenoid ValveCOMPONENT DESCRIPTION The hot gas solenoid valve functions only during the harvest cycle, to divert the hot discharge gasWater Inlet Solenoid Valve from the compressor, by passing the condenser, for direct flow in the evaporator plates to releaseThe water inlet solenoid valve fills the sump ice cubes from the ice cube molds. The hot gasassembly with water and excess water overflows solenoid valve is installed in a branch of theout the standpipe and down the drain. This action discharge line. When the harvest cycle begins thefills and rinses the sump during each harvest energized solenoid coil lifts the valve stem withincycle. The flow rate is 1 g.p.m. the valve body, to cause the hot discharge gas to be diverted to the evaporators.Water Distribution SystemThe water distribution system evenly supplies Strainerwater to all cells of the evaporator plates. Thewater pump pumps water from the sump up the A water strainer is located in the potable inlet watervertical tygon tube to the tee. From there water is line before the water inlet solenoid valve. Cleanchanneled through the water manifold to the water the water strainer frequently.distributors, above each evaporator plate, andfrom six holes within each distributor, water flowsto the cells of each side of the evaporator plates.Gravity flow returns the unfrozen excess portion ofwater to the sump reservoir for recirculation. WATER DISTRIBUTORSSUMP STAND PIPE OPTIONAL WATER FILTERHANDVALVE SUMP PUMP COMPONENT LOCATION DRAIN CAP September 1993 Page 16

CMS1202RCLEANING/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////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 master switch to the WASH position. 9. Let the unit operate for 30 minutes. Electrical Shock During the wash cycle, if the machine runs out of Hazard. solution, mix 2 more gallons of solution per step 6, Electrical shock can refill the sump and continue the wash cycle for the cause personal injury. remainder of the 30 minutes. Cleaning procedures are done with the power ON. 10. Move the ICE-OFF-WASH switch to the OFF (center) position.the ICE-OFF-WASH rocker switch to OFF. 11. Remove the cap and drain the cleaning3. Remove the control box cover, and rotate the solution from the sump. Replace the drain cap.shaft of the timer and switch assemblyCLOCKWISE advancing to the freezing cycle. 12. Rotate the shaft of the timer and switch(Beginning of the higher part of the cam against assembly CLOCKWISE to the harvest positionthe microswitch). (low part of the cam against microswitch). Move the ICE-OFF-WASH switch to the ICE position to4. Open the ice storage bin door and discard all start the Harvest cycle.the ice. If after completing this procedure one or more5. Remove the hose clamp, rubber cap and drain evaporator plates does not have a full flow of waterall the water from the sump assembly into the bin. 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 MachineCleaner with 2 gallons of warm (950F. - 1150F.) Note: The ice making portion of the water systemwater. should be sanitized after cleaning by repeating steps 2-12 and substituting a sanitizing solution for Scotsman Ice Machine the cleaning solution. Cleaner contains acids. These 13. Move the compressor switch to the ON compounds may position to start the icemaking process. cause burns. If swallowed, DO NOT ///////////////////////////////////CAUTION/////////////////////////////// induce vomiting. Give large amounts of water DO NOT use ice produced from the cleaning or milk. Call Physician solution. Be sure none remains in the bin. immediately. In case of external contact, flush /////////////////////////////////////////////////////////////////////////////////// with water. KEEP OUT OF THE 14. Check the next ice cube harvest to be certain REACH OF CHILDREN. that the ice cubes are clear and the acid taste is gone. 15. Add hot water to the bin to melt the ice. 16. Replace all panels. September 1993 Page 17

CMS1202R To remove scale:CLEANING 1. Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of hot (950 F. toRemote Condenser 1100F.) water.1. Shut off the ice machine. Scotsman Ice Machine Cleaner contains The fan blade can cause acids. These personal injury. compounds may cause burns. Disconnect power If swallowed, DO NOT before beginning to induce vomiting. Give clean condenser. large amounts of water or milk. Call Physician2. Remove dirt and debris that might be under the immediately. In case ofcondenser. external contact, flush with water.3. Brush off the bottom of the condenser fins. Donot use a wire brush. KEEP OUT OF THE REACH OF CHILDREN.4. Check to see that the inside of the condenser isclean; light should be visible through the fins. If 2. Remove all ice from the bin.not, clean the internal parts by vacuum, pressurewasher and/or coil cleaner. 3. Using rubber gloves, dip a nylon scouring pad into the cleaning solution, and scub the scale off ofIce Storage Bin the liner.The interior liner of the bin is in contact with a food 4. After the scale has been removed, rinse all ofgrade product: ice. The storage bin must be the surfaces inside the bin with clean, potablecleaned regularly to maintain a sanitary water.environment. Once a week cleaning with soap andwater, a hot water rinse and and air dry is a basic To sanitize the bin and ice machine:procedure. Scale that may form on the plastic linerof a bin may be removed by scrubbing the surface Follow local codes for frequency of sanitizing. Useof the line with a mixture of Scotsman Ice Machine an approved sanitizer and follow the directions andCleaner and hot water. Remove any scale prior to warnings of that santitizer or use the followingsanitizing. instructions for use of household bleach, if it meetsNote: Some ice storage bins have Stainless local codes:Steel liners. They may become stained fromchlorine gases released from the water. These 1. Remove all ice from the bin.stains must be removed by regular cleaning toprevent pitting of the metal liner. To prevent the 2. Mix a sanitizing solution of 1 ounce ofstaining, an activated charcoal filter should be household bleach to 2 gallons of water.added to the ice machines incoming watersupply line; activated charcoal removes the 3. Using clean rubber gloves and a clean cloth,chlorine. This may require more frequent wipe all interior surfaces of the ice machine andsanitation. ice storage bin with the sanitizing solution. Immerse any small parts in the sanitizing solution and wash the parts, flushing the solution thoroughly in, over and through all parts and surfaces of the parts being cleaned. 4. Allow to air dry.September 1993 Page 18

CMS1202RSYSTEM SPECIFICATIONSThe following numbers can be used as a guideline. There will be some variation from unit to unit.Typical Cycle Time •17 minutes @ 70oF. air and 50oF. water; 20 minutes @ 90oF. air and 70oF. water.Typical Harvest Ice Weight •13-14 lbs.Typical Low Side Pressure •21-22 PSIG @ 70oF. air and 50oF. water •24 PSIG @ 90oF. air and 70oF. waterTypical Freeze Cycle Discharge Pressure •250 - 210 PSIGRefrigerant Charge •256 ounces of R-22Harvest Time •Preset at 3.5 minutes, may be adjusted to suit local conditionsTypical Suction Pressure in Harvest •65-70 PSIG @ 70oF. air and 50oF. water •80-85 PSIG @ 90oF. air and 70oF. water.Typical Discharge Pressure in Harvest •75-80 PSIG @ 70oF. air and 50oF. water •100 PSIG @ 90oF. air and 70oF. water.Typical Compressor Amp DrawSingle phase •Beginning freeze = 11-12, End of Freeze = 8-9, Harvest = 9-10Three phase •Three phase amps vary between 6 and 10High Pressure Cut Out •Cuts out at 400 PSIG, manual resetCompressor •Copeland CRG3-0250-PFV-270 (single phase) •Copeland CRG3-0250-TF5-270 (three phase)Ice Level Control •Maximum Range = 8 feetTimer •1 revolution takes 8 minutesCube Size Control •Cut In adjustable between 0oF. and +250F. September 1993 Page 19

CMS1202R To Adjust The Timer & Switch Assembly:ADJUSTMENTS MICROSWITCH CLOSE UP VIEW OF TIMER Electrical power present in the control box can SWITCH cause personal injury. ACTUATOR Disconnect power before beginning to CAM adjust timer.Adjustment Of The Timer & Switch Assembly The length of the harvest cycle can be changed byOne complete revolution of the cam on the timer loosening the set screw on the cam, and thentakes eight minutes. The normal setting is three rotating the shaft so that the opening between theand one-half minutes, as set at the factory. lt is cams change. More of an opening between theimportant that the length of the harvest cycle allow cams = more harvest time.enough 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. TIMER CAMADJUSTING TIMER September 1993 Page 20

SERVICE DIAGNOSIS: Water CMS1202RSYMPTOM POSSIBLE CAUSE PROBABLE FIXNo ice is made Clean inlet screen, check coil, Inlet water valve will not open or is replace valve if required dirty Check pump motor, replace pump if motor will not run. No water being pumped over No water in reservoir, check inlet evaporators. water valve, check reservoir for leak. Replace inlet water valveCubes are not uniform in shape Water inlet valve leaks thru at highLong Freeze Cycle rate Clean water systemMakes thick ice/freezes up Water distributors are dirty Replace inlet water valve Inlet water valve leaks through See electrical/adjustmentCubes too large See electrical/adjustment Clean or replace valveLow Capacity Water inlet valve restricted Check water filter or supplyUnit runs out of water Low water pressure Re-position sump covers Sump covers out of position Replace inlet water valve Inlet water valve leaks through See electrical/adjustment See electrical/adjustment Check water temperature to building Incoming water very warm See unit runs out of water Lack of water Repair leak Reservoir leaks Clean or replace valve Inlet water valve restricted Adjust timer Short harvest cycle Check supply Water pressure too low September 1993 Page 21

CMS1202RSERVICE DIAGNOSIS: Electrical and/or AdjustmentsSYMPTOM POSSIBLE CAUSE PROBABLE FIXMachine does not operate No power Reconnect powerMakes thick ice/freezes up High pressure control open Reset, check machineRuns, makes no ice High temperature cut out open Hot gas valve leaks thru, replaceLong freeze cycleCubes too small P. C. Board Open Replace boardCubes too largeCompressor cycles on and off on Master switch open Test/replacepump down control Timer contacts open Replace timerCompressor will not runUnit cycles on and off anytime in any Bin ice level control holding machine See page 24cycle off Harvest Cycle too short Adjust timer Low water pressure Check water filter or supply Hot gas valve defective Replace hot gas valve 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 Timer stuck Replace timer Relay does not energize; unit stuck in Replace relay harvest Water inlet valve leaks through Replace inlet water valve 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 Low refrigerant charge Locate leak, repair, replace drier, evacuate and weigh in nameplate charge. Liquid line valve or drier restricted Check and replace TXV restricted Check and replace Head pressure control valve not Check/replace head pressure control working (low condensing temp.) valve Low pressure control will not close Check pump down control for proper operation Contactor coil open Check/replace contactor Compressor windings open Check replace compressor Loose connection in PC board Replace PC board September 1993 Page 22

CMS1202RSERVICE DIAGNOSIS: Refrigeration and/or MechanicalSYMPTOM POSSIBLE CAUSE PROBABLE FIXPoor harvestUnit cycles off during freeze or Hot gas valve does not open Check for power to the coil, check forharvest not opening, replaceLow capacity Head pressure control valve does not Replace head pressure control valve.Unit shuts off before bin is full maintain enough head pressure.Compressor cycles on and off Hi temperature switch opens and Hot gas valve leaks thru, replace itFrost on compressor closes High head pressure, from dirty Clean condenser, repair fan motor condenser, faulty fan motor Non condensable gas in the system Purge system, evacuate and weigh in nameplate charge Extreme hot location Relocate the cabinet Overcharge of refrigerant Evacuate and weigh in nameplate charge Hot gas valve leaks thru At the end of the freeze cycle there should be frost on the evaporator end of the hot gas tubes, if not replace the hot gas valve Liquid and discharge lines are in Separate and insulate them contact with each other Bin Ice level control is set to “Partial” Move bin Ice level rocker switch to “Full”. Low pressure control opening and Check low side pressure, liquid line closing valve must open and low side pressure raise over 35 PSIG before pump down control will close to run compressor Compressor overheats TXV not letting enough refrigerant into evaporators, adjust or replace TXV Mechanical fault with compressor, replace compressor Some frost will not hurt Do nothing TXV meters too much refrigerant Adjust or replace TXV September 1993 Page 23

CMS1202RSERVICE DIAGNOSIS: Bin Ice Level ControlCONDITION 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 (the compressor will not operate (models built after 4/93). If there is auntil the liquid line valve opens, but light on, check relay contacts N.O.the pump should be working if there and COM. The contacts should beis no ice in the bin). CLOSED. If closed, go to D. If not, replace the board. If light is off, orMachine runs, makes ice, switches prior model, go to B.on and off, but ice level cannot becontrolled. B. Remove front panel(s), twist If the inside of the transducer (aboveMachine runs, but will not shut off. 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 Line Voltage. TIMER POSTS MENTIONED IN “D” ABOVE September 1993 Page 24

REMOVAL AND REPLACEMENT CMS1202R Electrical Shock Cube Size Control Hazard. To remove the cube size control: Electrical shock can 1. Remove front panel. cause personal injury. 2. Remove cover from control box. Disconnect power 3. Trace capillary tube, from the cube size control before beginning to to the refrigerant suction line. service components. NOTCH IN BACK OFWater Distributor Tubes And Manifold Tubes CONTROL BOXTo remove the water distributor tube and manifoldtube: CUBE SIZE1. Remove the front panel. CONTROL2. Slide the water distributor tube to the front about REPLACEMENT OF THE CUBE SIZE CONTROL1/8-inch along the top of the evaporator plate, untilthe water distributor tube can be unsnapped from 4. Remove the coiled capillary tube bulb from thethe flexible notch and lifted upward. tube well on the suction line. 5. Remove electrical leads from the cube size WATER DISTRIBUTOR control. 6. Remove screws and pull the capillary tube through the notch in the back of the control box. Remove the cube size control. To replace the cube size control, reverse the removal procedure.3. Unsnap and disconnect water distributor tubesfrom the water manifold section. To replace thewater distributor tubes and manifold tubes, reversethe removal procedure. BE SURE the notches inthe water manifold tubes properly engage thealignment keys in the tee. BE SURE the waterdistributor tube is securely fastened at the notch atboth 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 25

CMS1202R Inlet Water Solenoid Valve AssemblyREMOVAL AND REPLACEMENT To remove the inlet water solenoid valve assembly: Electrical Shock 1. Shut OFF water supply to machine. Hazard. Electrical shock can 2. Loosen and remove outlet water line from the cause personal injury. inlet water solenoid valve assembly. Disconnect power before beginning to 3. Remove screws and pull the water solenoid service components. valve out to gain access. INLET WATERWater Pump1. Remove front panel. VALVE2. Unplug water pump electrical connection.3. Drain water reservoir. STRAINER4. Use corbin clamp pliers to loosen and slidecorbin clamps on hoses away from pump. REMOVAL OF THE5. Remove screws retaining pump to bracket. INLET WATER VALVE6. Pull pump out of ice machine.7. Reverse to reassemble. 4. Pull electrical cord from solenoid coil terminals.8. Replace front panel. 5. Remove inlet water fitting from the water8. Reconnect electrical power. solenoid valve. To replace the inlet water valveTransducer assembly, reverse the removal procedures.1. Disconnect electrical power BEFORE removing Bin Ice Level Control Circuit Boardtransducer. 1. Disconnect Electrical Power before removing2. Remove front panel and locate the transducer circuit board.socket. 2. Remove front panel.3. Twist inner portion of transducer 3. Remove control box cover.counter-clockwise and push up gently. 4. Remove wires from circuit board connections.4. Unplug transducer and remove from the 5. Unlock circuit board fasteners by twisting 1/2machine. turn.5. Reverse steps 1-5 to reassemble. 6. Pull circuit board of off fastener posts. 7. Reverse to reassemble, refer to wiring diagram as needed.September 1993 Page 26

REMOVAL AND REPLACEMENT CMS1202RThermostatic Expansion Valve Hot Gas or Liquid Line Valve.1. Before replaceing this valve, be certain that the 1. Before replaceing this valve, be certain that thevalve is the cause of the problem, and cannot be valve is the cause of the problem.adjusted. 2. Remove the front panel.2. Remove the front panel. 3. Dischargeand recover the refrigerant.3. Discharge and recover the refrigerant. 4. Unplug the coil of the valve.4. Locate the TXV bulb (on the suction line),remove the clamps and bulb from the tube. 5. With the refrigeration system open, unsweat the valve from the tubing.5. With the refrigeration system open, unsweat theTXV from the tubing. 6. Place the new valve in position.6. Place the new TXV in position. 7. Wrap the new valve body with wet rags. Do not get any moisture in the valve.7. Wrap the new TXV body with wet rags. Do notget any moisture in the valve. 8. Carefully braze the valve to the tubing. Examine the joints, if they look good procede to the next8. Carefully braze the valve to the tubing. Examine step, if not, re-do them.the joints, if they look good procede to the nextstep, if not, re-do them. 9. Install a new dryer, and braze it in place also.9. Install a new dryer, and braze it in place also. 10. Plug the power cord back onto the coil.10. Reattach the TXV bulb to the suction line in the 11. Evacuate the system to 500 microns.same place as the old one. 12. Weigh or measure the nameplate charge into11. Evacuate the system to 500 microns. the receiver.12. Weigh or measure the nameplate charge into 13. If the machine has been off on the breakerthe receiver. there may be refrigerant trapped in the oil of the13. If the machine has been off on the breaker compressor, so do not restart until the compressorthere may be refrigerant trapped in the oil of the has been warmed by the crankcase heater for 12compressor, so do not restart until the compressor hours. If the compressor was warm throughout thehas been warmed by the crankcase heater for 12 replacement process, the ice machine may behours. If the compressor was warm throughout the restarted without waiting to re-warm thereplacement process, the ice machine may be compressor.restarted without waiting to re-warm thecompressor.Refrigerant: FRONT SEATED VALVENO liquid refrigerant may be put into this system SERVICE PORTanywhere except the receiver. DO NOT use theSchrader valves at the front of the machine forweighing in the charge: use the “king” or receiverservice valve. All liquid R-22 must be weighedinto the receiver through the “front seated”receiver outlet service valve. September 1993 Page 27