MCM1462R INTRODUCTION To the owner or user: This service manual is intended to provide you and the maintenance or service technician with the information needed to install, start up, clean, maintain and service this ice system. Table of Contents Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 For the Installer Location & Assembly Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCM1462R FOR THE INSTALLER Other items required: The MCM1462R will fit Scotsman ice storage bin MDB900 and is stackable with stacking kit KSMCM48. Either a Scotsman remote condenser or a Mac 6 condensing system are required to for this ice system. • Precharged tubing kit • Power cord and receptical • Condenser power cord • If stacking two units, a stacking kit • If using one unit, a caster kit for the bin.
MCM1462R FOR THE INSTALLER: Location & Assembly Location: After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space around it to be accessible for service. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the envrionmental limitations.
MCM1462R FOR THE INSTALLER: Location & Assembly Stacking Instructions A stacking kit, KSMCM48, is required to interconnect the ice level controls, seal the freezing compartments, support the bin with heavy duty legs, and retain the front panels. (The top removed from the lower icemaker will no longer have any function.) Add a strip of gasket (from the stacking kit) to the top edge of the bottom ice machines evaporator compartment.
MCM1462R FOR THE INSTALLER: Scotsman Remote Condenser Locate the condenser as near as possible to the interior location of the ice maker. Precharged Line Routing Location of the condenser is limited by the specific length of precharged refrigerant tubing supplied for the application. The pre-charged tubing connects the icemaker to the remote condenser. The condenser must be above the ice maker. Do not connect precharged tubing until all routing and forming of the tubing is complete.
MCM1462R FOR THE INSTALLER: Mac 6 Remote Condenser MAC 6 INSTALLATION ELECTRICAL CONNECTION TO ICE MACHINE DISCHARGE LINE FROM ICE MACHINE LIQUID LINE TO ICE MACHINE Precharged Line Routing Follow straight line routing whenever possible. /////////////////////////////CAUTION/////////////////////////////// Any excess tubing MUST be retained within the building. Do not connect precharged tubing until all routing and forming of the tubing is complete.
MCM1462R FOR THE INSTALLER: Coupling Instructions ////////////////////////////////CAUTION///////////////////////////////// Final Connections: The couplings on the sets of precharged lines are self sealing when installed properly. Carefully follow the instructions: 3.
MCM1462R FOR THE ELECTRICIAN SEE NAMEPLATE for current requirements to determine wire size to be used for electrical hookup. When the cuber and the remote condenser are connected, each must be grounded to the other using the ground screws provided in the respective junction boxes. The cuber then requires a solid chassis to chassis earth ground wire. See Wiring Diagram. Be certain the cuber is connected to its own electrical circuit and individually fused.
MCM1462R FOR THE PLUMBER The recommended water supply line is a 3/8-inch O.D. copper tubing with a minimum operating pressure of 20 PSIG and a maximum of 80 PSIG. Connect to cold water supply line with standard plumbing fittings, with shut off valve installed in an accessible place between the water supply and the cuber. ln some cases a plumber will be required. Water Limitations: An ice machine is a food manufacturing plant, it takes in a raw material, water, and turns it into a food product, ice.
MCM1462R FINAL CHECK LIST 1. Is the cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified? 2. Is there clearance at the left and back sides of the cabinet for service access? 3. Has water supply pressure been checked to insure a minimum of 20 PSIG and a maximum of 80 PSIG operating pressure? 4. Is the cabinet level? 5. Check that any shipping material has been removed from inside the cabinet. FINAL INSTALLATION 6.
MCM1462R INITAL START UP Before Start Up: FRONT VIEW OF TIMER 1. Check that the ICE-OFF-WASH rocker switch and the COMPRESSOR ON-OFF toggle switch are in the OFF position, on the control box. 2. Switch on the electrical power. Electrical power must be supplied to the ice machine for 12 hours before starting the compressor for the first time. The crankcase heater will now heat the compressor’s oil. The oil is warmed to evaporate any refrigerant that may have collected in it.
MCM1462R INITAL START UP 9. Check operation of the freezing cycle: The compressor is operating.The icemaking process begins; feeling the metal parts of the evaporator plate reveals cold temperature, very shortly ice begins to form. Tubing will become frosted at the top of the evaporator plate. Freezing time will range between 12 and 15 minutes. Longer time for temperatures above 70 degrees F. and shorter time required whentemperatures are below 70-degrees F. Average complete cycle time is about 14 minutes.
MCM1462R FREEZING CYCLE OPERATION Water from the sump assembly is pumped to the water distributor system at the top of each evaporator plate. From the water distributor the water cascades by gravity over all cells of the plate and to the sump assembly below. At the beginning of the freezing cycle, the electrical circuit is completed to the compressor and the water pump. The water pump operates continuously, through both the freezing cycle and the harvest cycle.
MCM1462R HARVEST CYCLE - HOT GAS BYPASS When the timer switches the icemaker into the harvest cycle, high pressure, high temperature gas refrigerant being discharged from the compressor is diverted from the condenser through the hot gas solenoid valve into each evaporator plate. During this cycle, the refrigerant bypasses the condenser.
MCM1462R COMPONENT DESCRIPTION Cube Size Control Timer - Timer & Switch Assembly This reverse acting thermostat controls the length of the freezing cycle. It is sensing the temperature of the suction line. When the suction line gets cold enough, the cube size control closes (on temperature fall) and starts the timer.
MCM1462R COMPONENT DESCRIPTION Bin Level Control This electronic control uses sound waves to measure the distance between the bottom of the ice machine and the top of the ice in the bin. It is designed to control the machine’s ice production to maintain that distance. The control is adjustable so that the ice machine will maintain a certain height of ice.
MCM1462R COMPONENT DESCRIPTION Water Inlet Solenoid Valve Hot Gas Solenoid Valve The water inlet solenoid valve fills the sump assembly with water and excess water overflows out the standpipe and down the drain. This action fills and rinses the sump during each harvest cycle. The flow rate is 1 g.p.m.
MCM1462R CLEANING ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order 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.
MCM1462R CLEANING Remote Condenser To remove scale: 1. Shut off the ice machine. 1. Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of hot (950 F. to 1100F.) water. The fan blade can cause personal injury. Disconnect power before beginning to clean condenser. 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.
MCM1462R SYSTEM SPECIFICATIONS The following numbers can be used as a guideline when servicing the CMS1402. There will be some variation from unit to unit, so allow for that. THIS MACHINE USES REFRIGERANT 22 Components: Timer, 1 revolution of the cam takes 8 minutes, harvest time is factory set at 3 1⁄2 minutes, but is adjustable. Inlet water valve, water flow in g.p.m. = 1 Cube size control, reverse acting temperature range High pressure safety, Manual CUT IN . . . . . . . (00F. to +250F.) CUT OUT . .
MCM1462R ADJUSTMENTS MICROSWITCH SWITCH ACTUATOR Electrical power present in the control box can cause personal injury. Disconnect power before beginning to adjust timer. Adjustment Of The Timer & Switch Assembly One complete revolution of the cam on the timer takes eight minutes. The normal setting is three and one-half minutes, as set at the factory. lt is important that the length of the harvest cycle allow enough time for all the ice cubes to fall from the evaporator.
MCM1462R SERVICE DIAGNOSIS: Water SYMPTOM POSSIBLE CAUSE PROBABLE FIX No ice is made Inlet water valve will not open or is dirty Clean inlet screen, check coil, replace valve if required No water being pumped over evaporators. Check pump motor, replace pump if motor will not run. No water in reservoir, check inlet water valve, check reservoir for leak.
MCM1462R SERVICE DIAGNOSIS: Electrical and/or Adjustments SYMPTOM POSSIBLE CAUSE PROBABLE FIX Machine does not operate No power Reconnect power High pressure control open Reset, check machine High temperature cut out open Hot gas valve leaks thru, replace P. C.
MCM1462R SERVICE DIAGNOSIS: Refrigeration and/or Mechanical SYMPTOM POSSIBLE CAUSE PROBABLE FIX Poor harvest Hot gas valve does not open Check for power to the coil, check for not opening, replace Head pressure control valve does not Replace head pressure control valve. maintain enough head pressure.
MCM1462R SERVICE DIAGNOSIS: Bin Ice Level Control CONDITION DETERMINE CAUSE PROBABLE CORRECTION Ice Machine does not run, it has power to it, the high pressure control is closed, the on/off switch is set to ON (the compressor will not operate until the liquid line valve opens, but the pump should be working if there is no ice in the bin). A. Listen for a ticking sound from transducer. If no noise, go to C. If there is a noise, check for a light on the board (models built after 4/93).
MCM1462R REMOVAL AND REPLACEMENT Cube Size Control To remove the cube size control: Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. 1. Remove front panel. 2. Remove cover from control box. 3. Trace capillary tube, from the cube size control to the refrigerant suction line. NOTCH IN BACK OF CONTROL BOX Water Distributor Tubes And Manifold Tubes To remove the water distributor tube and manifold tube: 1. Remove the front panel. 2.
MCM1462R REMOVAL AND REPLACEMENT Inlet Water Solenoid Valve Assembly To remove the inlet water solenoid valve assembly: Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. 1. Shut OFF water supply to machine. 2. Loosen and remove outlet water line from the inlet water solenoid valve assembly. 3. Remove screws and pull the water solenoid valve out to gain access. INLET WATER VALVE Water Pump 1. Remove front panel. 2.
MCM1462R REFRIGERATION SERVICE General: • Scotsman recommends that any work on the refrigeration system only be done when it is certain that the system needs repair. • Refrigerant should not be added except as a way to determine the proper operation of the product. If the system was low on refrigerant, there is a leak, and it must be found and repaired. • Refrigerant must not be wasted to the atmosphere, but recovered.
MCM1462R REMOVAL AND REPLACEMENT Thermostatic Expansion Valve Hot Gas or Liquid Line Valve. 1. Before replaceing this valve, be certain that the valve is the cause of the problem, and cannot be adjusted. 1. Before replaceing this valve, be certain that the valve is the cause of the problem. 2. Remove the front panel. 3. Discharge and recover the refrigerant. 3. Discharge and recover the refrigerant. 4. Unplug the coil of the valve. 4.
MCM1462R REFRIGERATION SERVICE General: • Scotsman recommends that any work on the refrigeration system only be done when it is certain that the system needs repair. • Refrigerant should not be added except as a way to determine the proper operation of the product. If the system was low on refrigerant, there is a leak, and it must be found and repaired. • Although this system uses R-22, it should not be wasted to the atmosphere, but reclaimed.
