User manual SCOTSMAN CME1202

[. . . ] CME1202 & CME1402 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 10 FREEZING CYCLE OPERATION HARVEST CYCLE - HOT GAS BYPASS COMPONENT DESCRIPTION . page 23 SERVICE DIAGNOSIS: Electrical and/or Adjustments SERVICE DIAGNOSIS: Ice Level Control Circuit . page 31 Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. This manual was printed on recycled paper. Keep this manual for future reference. Note this symbol when it appears in the manual. [. . . ] Found below the control box. CONTROL BOX CUBE SIZE CONTROL RELAY CONTROL SWITCH DETAIL TIMER AND MICROSWITCH ICE/OFF/WASH SWITCH BIN ICE LEVEL SELECTOR SWITCH Hi Pressure Safety, Push To Reset March 1995 Page 15 CME1202 & CME1402 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. When set at FULL it will not allow the machine to fill the bin any closer to the ice machine than about 8", and it will not work if the distance to the bottom of the bin is greater than 8 feet. BIN ICE LEVEL SELECTOR SWITCH ICE/OFF/WASH SWITCH 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. THE USER CAN SELECT THE AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. SOUND WAVES FULL PARTIAL January 1995 Page 16 CME1202 & CME1402 COMPONENT DESCRIPTION Water Inlet Solenoid Valve The water inlet solenoid valve fills the sump assembly with water. Water Distribution System 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. From there water is channeled through the water manifold to the water distributors, above each evaporator plate, and from six holes within each distributor, water flows to the cells of each side of the evaporator plates. Gravity flow returns the unfrozen excess portion of water to the sump reservoir for recirculation. Hot Gas Solenoid Valve The hot gas solenoid valve opens only during the harvest cycle, to divert the hot discharge gas from the compressor, by passing the condenser and capillary tube, for direct flow to the evaporator plates to release ice cubes from the ice cube molds. Fan Pressure Control Air-Cooled Models only. SUMP STANDPIPE WATER DISTRIBUTORS In both freeze and harvest cycles, the fan pressure control functions OPTIONAL to maintain a minimum WATER FILTER discharge pressure by cycling the fan on and off. is VALVE 190 PSIG. SUMP PUMP COMPONENT LOCATION January 1995 Page 17 DRAIN CAP CME1202 & CME1402 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. During the wash cycle, if the machine runs out of solution, mix 2 more gallons of solution per step 6, refill the sump and continue the wash cycle for the remainder of the 30 minutes. Remove the reservoir drain cap and drain the cleaning solution from the sump. Rotate the shaft of the timer and switch assembly CLOCKWISE to the harvest position (low part of the cam against microswitch). Move the WASH/OFF/ICE switch to the ICE position to start the Harvest cycle. If, after completing this procedure, one or more 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. Electrical Shock Hazard. Remove the control box cover, and rotate the shaft of the timer and switch assembly CLOCKWISE advancing to the freezing cycle. Remove the hose clamp, rubber cap and drain all the water from the sump assembly into a container. [. . . ] · Evacuate the system with a good vacuum pump to 300 microns or less. If the triple evacuation method is used, the vacuum should be broken each time with dry nitrogen, not refrigerant. If an ice machine is to be discarded and still contains refrigerant, Scotsman recommends that the refrigerant be recovered, reclaimed, or recycled so that it is not discharged into the air. May 1995 Page 29 CME1202 & CME1402 R-404A INFORMATION This ice machine uses R-404A refrigerant and polyolester oil. Do NOT Pressure-Temperature Chart for HP62 use mineral oil in this refrigeration system. [. . . ]