CME1202R & CME1402R 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 FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 BACK VIEW OF CABINET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3 ERC401 SPECIFICATIONS . . . . . . . . . . . . .
CME1202R & CME1402R FOR THE INSTALLER These machines will fit the following Scotsman ice storage bins: • BH900 • BH1000 (with bin top KBT21) • BH1360 A remote condenser and precharged tubing kit are required to assemble this ice system. The normal finish for the machine is enamel sandalwood. An optional stainless steel panel kit (SPKCMS48) can be field installed. It contains a stainless steel top, left side panel, an overlay right side panel, and front panels.
CME1202R & CME1402R BACK VIEW OF CABINET June 1996 Page 3
CME1202R & CME1402R ERC401 SPECIFICATIONS 23 13⁄16" 19 7⁄8" ERC Dimensions A B F G 43 3⁄8" 10 3⁄4" 21 3⁄4" 16 5⁄8" June 1996 Page 4
CME1202R & CME1402R 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 environmental limitations.
CME1202R & CME1402R FOR THE INSTALLER: Location & Assembly Stacking Instructions A stacking kit, KSCMS48, 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 ice maker 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.
CME1202R & CME1402R FOR THE INSTALLER: Scotsman Remote Condenser Locate the condenser as near as possible to the interior location of the ice maker. Precharged Line Routing CAUTION Location of the condenser is limited by the specific length of precharged refrigerant tubing supplied for the application. The pre-charged tubing connects the ice maker 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.
CME1202R & CME1402R FOR THE INSTALLER: Coupling Instructions Final Connections: CAUTION The couplings on the sets of precharged lines are self sealing when installed properly. Carefully follow the instructions: Initial Connections: 1. Remove the protector caps and plugs. Wipe the seats and threaded surfaces with a clean cloth to be certain that no foreign matter remains on them. 3.
CME1202R & CME1402R FOR THE ELECTRICIAN See the ice machine nameplate for current requirements to determine wire and fuse 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.
CME1202R & CME1402R 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. In some cases a plumber will be required.
CME1202R & CME1402R 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.
CME1202R & CME1402R INITIAL START UP Before Start Up: FRONT VIEW OF TIMER 1. Check that both the ICE-OFF-WASH rocker switch and the COMPRESSOR ON-OFF toggle switch are in the OFF position. 2. Switch on the electrical power. Electrical power must be supplied to the ice machine for 4 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.
CME1202R & CME1402R INITIAL START UP 9. Check operation of the freezing cycle: Ice will begin to form from the top of the evaporators down. After the first cycle, freezing time will range between 12 and 15 minutes. Longer time for temperatures above 70oF. and shorter time required when temperatures are below 70oF. Average complete cycle time is about 14 minutes. CUBE SIZE DIAGRAM JUST RIGHT 10. After an ice harvest, check Cube Size.
CME1202R & CME1402R 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.
CME1202R & CME1402R HARVEST CYCLE - HOT GAS BYPASS When the timer switches the ice maker 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.
CME1202R & CME1402R 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.
CME1202R & CME1402R 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.
CME1202R & CME1402R 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.
CME1202R & CME1402R 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. CLEANING: ICE MAKER 1. Remove screws and the front panel. 10. Move the ICE-OFF-WASH switch to the OFF (center) position. 2. Switch the compressor switch to OFF. Switch the ICE-OFF-WASH rocker switch to OFF.
CME1202R & CME1402R 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.
CME1202R & CME1402R SYSTEM SPECIFICATIONS: CME1202 The following numbers are a guideline to field operation There will be some variation from unit to unit. The numbers heading the columns are: Condenser air temp./Cabinet air temp./Water temp.
CME1202R & CME1402R SYSTEM SPECIFICATIONS: CME1402 The following numbers are a guideline to field operation. There will be some variation from unit to unit. The numbers heading the columns are: Condenser air temp./Cabinet air temp./Water temp.
CME1202R & CME1402R ADJUSTMENTS MICROSWITCH Electrical power present in the control box can cause personal injury. Disconnect power before beginning to adjust timer. CLOSE UP VIEW OF TIMER SWITCH ACTUATOR CAM Adjustment Of The Timer & Switch Assembly One complete revolution of the cam on the timer takes eight minutes. The harvest time set at the factory is three and a half minutes. It. is important that the length of the harvest cycle allow enough time for all the ice cubes to fall from the evaporator.
CME1202R & CME1402R SERVICE DIAGNOSIS: Water SYMPTOM No ice is made Cubes are not uniform in shape Long Freeze Cycle Makes thick ice/freezes up Cubes too large Low Capacity Unit runs out of water POSSIBLE CAUSE Inlet water valve will not open or is dirty No water being pumped over evaporators.
CME1202R & CME1402R SERVICE DIAGNOSIS: Electrical and/or Adjustments SYMPTOM Machine does not operate Makes thick ice/freezes up Runs, makes no ice Long freeze cycle Cubes too small Cubes too large Compressor cycles on and off on pump down control Compressor will not run Unit cycles on and off anytime in any cycle POSSIBLE CAUSE No power High pressure control open High temperature cut out open P. C.
CME1202R & CME1402R SERVICE DIAGNOSIS: Refrigeration and/or Mechanical SYMPTOM Poor harvest Unit cycles off during freeze or harvest Low capacity POSSIBLE CAUSE Hot gas valve does not open PROBABLE FIX Check for power to the coil, check for not opening, replace Head pressure control valve does Replace head pressure control not maintain enough head valve. pressure.
CME1202R & CME1402R SERVICE DIAGNOSIS: Bin Ice Level Control CONDITION DETERMINE CAUSE A. Listen for a ticking sound from Ice Machine does not run, it transducer. 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). B. Remove front panel(s), twist transducer 1/4 turn and pull out. DO NOT UNPLUG with power connected.
Sonar Sonar is Scotsman's ultrasonic device for measuring ice level and switching the ice machine on and off. It consists of a control board, transducer, level selector switch and transformer.
Sonar Service Diagnosis Step 1. Determine if it's a bin control problem. – Machine will not switch on Reset high pressure cut out Jump the two posts on the circuit board marked "bin thermostat". If the machine starts, the sonar system needs to be checked out. – If the machine does not start, something else is wrong.
Sonar Service Diagnosis Step 2: If it is a sonar problem, check the board. – 12 volts to board. If not, check the transformer. When ice is called for, the relay contacts are CLOSED. – Check the relay on the board. COM to NO should be closed.
Sonar Service Diagnosis Step 3. If the red light is NOT ON – Check the selector switch and harness. Jump out the two outside pins on the board where the selector switch harness plugs on. The indicator light should come on and the machine should start.
Sonar Service Diagnosis Step 4: If the red light is not on, and jumping the two outside pins does not work, check the transducer. – – CME1202 or CME1402: Twist and pull the transducer UP to remove it. CME865 and CME1002: Twist and pull the transducer DOWN to remove it.
Sonar Service Diagnosis Transducer – – Check “Ticking” sound is normal Examine the screen and face of the transducer. If the screen is dirty, clean it. If the face of the transducer is wet, dry it and try it again. If the face of the transducer is wrinkled, replace the transducer - NOT THE BOARD.
Sonar Service Diagnosis Transducer Check Switch power on and check the transducer against a hard, flat surface. Try a NEW transducer, if that does not fix the machine, replace the BOARD, but re-use the original transducer. – It is VERY UNLIKELY that BOTH the transducer and the BOARD have failed at the same time.
Sonar Service Diagnosis Check Transducer Resistor (green and white wires) - should be about 260-270 ohms.
CME1202R & CME1402R 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.
CME1202R & CME1402R 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.
CME1202R & CME1402R REMOVAL AND REPLACEMENT Thermostatic Expansion Valve Hot Gas or Liquid Line Valve. 1. Before replacing this valve, be certain that the valve is the cause of the problem, and cannot be adjusted. 1. Before replacing 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.
CME1202R & CME1402R REFRIGERATION SERVICE This ice machine uses R-404A refrigerant and polyolester oil. Do NOT Pressure-Temperature Chart for R-404A use mineral oil in this refrigeration system. VAPOR VAPOR • R-404A is a "Near Azeotrope" so liquid charging is required: See the TEMP. PRESS. TEMP. PRESS. next page. • When the system is serviced, a special liquid line drier is required. It is (DEG F) (PSIG) DEG F) (PSIG) -20 17 70 146 included with replacement compressors.
CME1202R & CME1402R LIQUID CHARGING Instructions for R-404A In preparation for charging, the low side hose should have a sight glass, and/or a restrictor device (such as a "Charge Faster") installed in it for metering liquid into the low side of the system. 1. After a thorough evacuation to at least 200 microns, shut off the manifold valves and switch off the vacuum pump. 2. Place a drum of R-404A onto an electronic scale. 3. Attach the charging hose to the drum. 4.
