User manual SCOTSMAN CME1402R

[. . . ] 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 12 FREEZING CYCLE OPERATION HARVEST CYCLE - HOT GAS BYPASS COMPONENT DESCRIPTION . page 24 SERVICE DIAGNOSIS: Electrical and/or Adjustments SERVICE DIAGNOSIS: Refrigeration and/or Mechanical . page 32 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. January 1995 Page 1 Note this symbol when it appears in the manual. [. . . ] Relay The multi-function, three pole, double throw, plug-in relay is installed directly into a receptacle on the printed circuit board in the control box. The relay functions in part to by-pass the bin thermostat control to prevent the ice maker from shutting OFF, when the bin thermostat opens during the freezing cycle. The bypass action serves to ensure full-sized ice cubes with each harvest cycle. Timer - Timer & Switch Assembly The function of the timer begins when activated by the cube size control. The outer surface, or large diameter lobe of the timer cam, determines the timer cycle for finish freezing of the ice cubes, while the inner surface, or small diameter lobe, determines the time cycle for the harvest cycle. When the microswitch button is pushed in there is power connected to the coil of the relay, and the unit is in the freeze cycle. When the microswitch button is released, the power to the relay is stopped, and the unit goes into harvest. The microswitch is actuated by a cam assembly directly connected to the timer motor. High Pressure Safety Control This is a manual reset control that shuts down the ice maker, should the discharge pressure ever reach 450 PSIG. Low Pressure Control (Pump Down) This pressure control connects power to the compressor contactor coil. Located below the control box. CONTROL BOX CUBE SIZE CONTROL RELAY TIMER & SWITCH Hi Pressure Reset, Push to Reset June 1996 Page 16 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. 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 Because it uses sound waves, a slight "ticking" sound can be heard coming from the bottom of the machine. There are three parts to the control, the transducer, the circuit board, and the ice level control switch. ICE/OFF/WASH SWITCH THE USER CAN SELECT THE AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. SOUND WAVES FULL PARTIAL June 1996 Page 17 CME1202R & CME1402R COMPONENT DESCRIPTION Water Inlet Solenoid Valve The water inlet solenoid valve fills the sump assembly with water and excess water overflows out the standpipe and down the drain. Water Distribution System The water distribution system evenly supplies 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 functions only during the harvest cycle, to divert the hot discharge gas from the compressor, by passing the condenser, for direct flow in the evaporator plates to release ice cubes from the ice cube molds. The hot gas solenoid valve is installed in a branch of the discharge line. When the harvest cycle begins the energized solenoid coil lifts the valve stem within the valve body, to cause the hot discharge gas to be diverted to the evaporators. WATER DISTRIBUTORS SUMP STAND PIPE OPTIONAL WATER FILTER HAND VALVE SUMP PUMP COMPONENT LOCATION June 1996 Page 18 DRAIN CAP CME1202R & CME1402R CLEANING A Scotsman Ice System represents a sizable investment of time and money in any company's business. [. . . ] 6 39 96 219 · Close the valve and replace the caps when the job is finished. 8 41 98 225 The valve must be closed and the caps must be on or the valve 10 43 100 232 will leak. 12 46 102 239 General Information: 14 48 104 246 Work on the refrigeration system should only be done when it is certain 16 50 106 253 that the system needs repair. 18 53 108 260 20 55 110 268 · Refrain from checking refrigeration pressures without reason. [. . . ]