CMS1202 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 Location & Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMS1202 FOR THE INSTALLER The CMS1202 will fit Scotsman’s ice storage bin (48" wide) model BH900, and with adaptors, the following Scotsman ice storage bins: • BH1000 (use KBT21) • BH1360. When stacking onto another CMS1202 or a CMS1402, use kit KSCMS48. The normal finish for the machine is enamel sandalwood. An optional stainless steel panel kit (SPKCMS1402) can be field installed. It contains a stainless steel top, left side panel, an overlay right side panel, and front panel.
CMS1202 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. A minimum of 6" must be allowed at the back for air circulation on air cooled models. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the envrionmental limitations.
CMS1202 FOR THE INSTALLER: Location & Assembly Stacking Instructions When stacking two units, remove the top panel and the evaporator cover from the lower icemaker. (The top removed from the lower icemaker will no longer have any function.) Carefully lift the uncrated top unit onto the bottom one and align the two cabinets. Use of a mechanical lift is recommended for this step.
CMS1202 FOR THE ELECTRICIAN SEE NAMEPLATE for current requirements to determine wire size to be used for electrical hookup. The cuber 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. Voltage variation should not exceed ten percent of the nameplate rating, even under starting conditions. Low voltages can cause erratic operation and may be responsible for serious damage to the icemaker.
CMS1202 FOR THE PLUMBER FOLLOW ALL LOCAL CODES: DRAIN 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. Connections: All drains are gravity type and must have a minimum of 1/4-inch fall per foot on horizontal runs. The drains to be installed to conform with the local plumbing code. Install a vertical open vent on drain line high point to insure good draining.
CMS1202 FINAL CHECK LIST 8. Is the water supply line shut off valve installed and electrical wiring properly connected? 1. Is the cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified? 2. Is there at least six inches clearance at the left and back sides of the cabinet for proper air circulation? (Air Cooled models) 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.
CMS1202 INITIAL START UP 1. Remove the front panels by removing screws at the base and pulling out. FRONT VIEW OF TIMER 2. Remove two screws and the control box cover. 3. Check that the two switches on the control box, the ICE-OFF-WASH rocker switch and the COMPRESSOR ON-OFF toggle switch are in the OFF position. ACTUATOR BUTTON MICROSWITCH CAM 4. OPEN the water supply line shut off valve. 5. Switch the electrical power ON. 6. Inside the control box is the shaft of the timer and the switch assembly.
CMS1202 INITIAL START UP 12. After an ice harvest check Cube Size. There is just enough water in the reservoir to make one full sized batch of cubes. The water pump may pick up some air at the end of the freezing cycle and then bubbles in the pump discharge hose are normal. If the water pump quits pumping water, the cube size control may be set too cold, or the water system may be leaking water. Compare cube size to the "Cube Size Diagram".
CMS1202 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.
CMS1202 HARVEST CYCLE - HOT GAS BYPASS When the timer switches the icemaker into the harvest cycle, the finish relay is de-energized, and the hot gas valve and inlet water valve OPEN. Then 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. Both the compressor and the water pump are operating.
CMS1202 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.
CMS1202 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. Because it uses sound waves, a slight “ticking” sound can be heard coming from the bottom of the machine. There are two parts to the control, the circuit board, and the level control switch.
CMS1202 COMPONENT DESCRIPTION Water Inlet Solenoid Valve Water Distribution System The water inlet solenoid valve fills the sump assembly with water. Extra water overflows out the overflow standpipe of the sump. This action fills and rinses the sump during each harvest cycle. The flow rate is 1 g.p.m. The water distribution system functions to evenly supply water to all cells of the evaporator plates. The water pump pumps water from the sump up the vertical tygon tube to the tee.
CMS1202 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.
CMS1202 CLEANING AIR COOLED CONDENSER CLEANING 1. Disconnect electrical power. CONDENSER The fan blade can cause personal injury. Disconnect power before begining to clean condenser. AIR COOLED CONDENSER MUST BE CLEAN FILTER 2. Remove front panel. 3. Clean or replace the air filter. 4. Check to see that the inside of the condenser is clean; light should be visible through the fins. If not clean the internal parts by vacuum, pressure washer and/or coil cleaner.
CMS1202 ADJUSTMENTS Adjustment Of The Water Regulator Assembly Water-cooled Models Adjustment Of The Cube Size Control The correct compressor head pressure on water cooled models is 220 PSIG.
CMS1202 ADJUSTMENTS Adjustment Of The Timer & Switch Assembly Electrcial power present in the control box can cause personal injury. Disconnect power before begining to adjust timer. To Adjust The Timer & Switch Assembly: The length of the harvest cycle can be changed by loosening the set screw on the cam, and then rotating the shaft so that the opening between the cams change. More of an opening between the cams = more harvest time.
CMS1202 SYSTEM SPECIFICATIONS The following numbers can be used as a guideline when servicing the CMS1202. There will be some variation from unit to unit, so allow for that. COMPONENTS: Timer, 1 revolution of the cam takes 8 minutes, harvest time is factory set at 3 1⁄2 minutes, but is adjustable. Inlet water valve, water flow in g.p.m. = 1 Cube size control, reverse acting temperature range CUT IN . . . . . . . (00F. to +250F.) CUT OUT High pressure safety, (air cooled) . . . . . . . . . . . . . . . . .
CMS1202 SERVICE DIAGNOSIS: Electrical and/or Adjustments SYMPTOM POSSIBLE CAUSE PROBABLE FIX Nothing operates Bin level control holding machine off Bin is full - use some ice. Check ice level control circuit, see page 22. Makes thick ice/freezes up No Power Reconnect power High pressure control open Reset, check machine High temperature cut out open Hot gas valve leaks thru, replace P. C.
CMS1202 SERVICE DIAGNOSIS: Refrigeration and/or Mechanical SYMPTOM POSSIBLE CAUSE PROBABLE FIX Poor harvest Too short harvest time Check and adjust harvest time Restriction of incoming water Check supply, filter, strainer and valve Hot gas valve does not open Check for power to the coil, check for not opening, replace Not enough refrigerant Locate leak, repair, replace drier, evacuate and weigh in nameplate charge.
CMS1202 SERVICE DIAGNOSIS: Ice Level Control Circuit 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. 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). If there is a light on, check relay contacts N.O. and COM. The contacts should be CLOSED. If closed, go to D. If not, replace the board.
CMS1202 REMOVAL AND REPLACEMENT Water Distributor Tubes And Manifold Tubes Cube Size Control To remove the water distributor tube and manifold tube: To remove the cube size control: Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before begining to service components 1. Remove the front panel. 2.
CMS1202 REMOVAL AND REPLACEMENT Electrical Shock Hazard. Electrical shock can cause personal injury. Inlet Water Solenoid Valve Assembly Disconnect power before begining to service components 2. Loosen and remove outlet water line from the inlet water solenoid valve assembly. To remove the inlet water solenoid valve assembly: 1. Shut OFF water supply to machine. INLET WATER VALVE Water Pump 1. Remove front panel. 2. Unplug water pump electrical connection. 3. Drain water reservoir. 4.
