User manual SCOTSMAN CME306

[. . . ] CME306 & CME456 INTRODUCTION This product manual contains the information needed for the setup, installation, initial start up, sanitation and maintenance of this ice machine. This manual is organized in the same way as the expected use of the machine, it begins with specifications, goes thru unpacking and setup, shows where everything is; continues with initial start up, then describes how it works. After that is the sanitation section, followed by service diagnosis and repair. CM CubedTM Cuber Performance Raised to a Higher Power. TM TM TABLE OF CONTENTS Specifications · · · · · · · · · · · · · PAGE 2 Air Cooled Layout · · · · · · · · · · · PAGE 3 Water Cooled Layout · · · · · · · · · PAGE 4 Pre-Installation · · · · · · · · · · · · · PAGE 5 Location · · · · · · · · · · · · · · · · PAGE 6 On a Bin · · · · · · · · · · · · · · · · PAGE 7 On a Beverage Dispenser · · · · · · · PAGE 8 On a Motel Dispenser · · · · · · · · · PAGE 9 Cabinet Panel Removal: · · · · · · · · PAGE 10 Bin Thermostat: Optional Installation · PAGE 11 Plumbing - Air Cooled · · · · · · · · · PAGE 12 Plumbing - Water Cooled · · · · · · · PAGE 13 Electrical · · · · · · · · · · · · · · · · PAGE 14 After Utility Connections · · · · · · · · PAGE 15 Component Description and Function · PAGE 16 AutoIQ Controller · · · · · · · · · · · PAGE 17 How To Operate The AutoIQ Controller PAGE 18 Initial Start Up · · · · · · · · · · · · · PAGE 19 Adjustments · · · · · · · · · · · · · · PAGE 20 How This Machine Works · · · · · · · PAGE 21 How This Machine Works · · · · · · · PAGE 22 Parts Lists and Wiring Diagrams are Located in the Center of this Manual Technicians Only: Freeze Cycle Operational Sequence · · · · · · · · · · · · · · · PAGE 23 Technicians Only: Harvest Cycle Operational Sequence · · · · · · · · · · · · · · · PAGE 24 Sanitation and Cleaning · · · · · · · · PAGE 25 Additional Maintenance · · · · · · · · PAGE 26 Additional Maintenance: Ice Sensors · PAGE 27 Additional Maintenance: Air Filter Replacement · · · · · · · · · · · · · · · · · · · · · PAGE 29 Additional Maintenance: Condenser · · PAGE 30 Service Diagnosis: Controller Diagnostic Light Analysis · · · · · · · · · · · · · · · · PAGE 31 Service Diagnosis · · · · · · · · · · · PAGE 32 Service Diagnosis: Components · · · · PAGE 33 Service Diagnosis: PTCR · · · · · · · PAGE 34 Operational Characteristics: CME306 · PAGE 35 Operational Characteristics: CME456 · PAGE 36 Removal and Replacement: Water Level Sensor · · · · · · · · · · · · · · · · · · · · · PAGE 37 Removal and Replacement: Fan Blade and/or Fan Motor · · · · · · · · · · · · · · · · · · PAGE 38 Refrigeration · · · · · · · · · · · · · · PAGE 39 Before Calling for Service · · · · · · · PAGE 40 January 2000 Page 1 CME306 & CME456 Specifications This ice machine is designed to be installed indoors, in a controlled environment. [. . . ] Water flows into the ice machine during the harvest cycle thru the inlet water valve. The water valve will NOT be open the complete length of the harvest cycle. The water pump forces water to the top of the evaporators, both in the Freeze and Harvest cycles. Un-frozen water falls thru the cube deflector and back into the reservoir. As water is turned into ice, the water level in the reservoir falls, and at the point where the cubes are fully formed, the Water Level Sensor indicates to the AutoIQ Controller that it is time to begin the Harvest cycle. It is not necessary for the normal operation and maintenance of the machine. Water Distribution System Water Inlet Valve Purge Valve Water Pump Water Reservoir January 2000 Page 21 CME306 & CME456 How This Machine Works Refrigeration System The refrigeration system is similar to that of most commercial cube ice machines. Heat is removed from the water and discharged out the condenser during the freeze cycle. As liquid refrigerant passes thru the Thermostatic Expansion Valve, it enters the bottom of the evaporators, and ice will form at the bottom first. When cubes need to be released (Harvest) the Hot Gas Valve is opened and Hot discharge gas flows directly from the compressor to the evaporator inlets. This warms up the evaporators and the surface of the ice frozen to the evaporator surface melts. Ice then falls into the bin. Evaporators Condenser Check Valves, CME456 Only TXV Bulb TXV Bulb Compressor Thermo Expansion Valve(s) Hot Gas Valve January 2000 Page 22 CME306 & CME456 Technicians Only: Freeze Cycle Operational Sequence Assuming the machine has been operational, the Freeze cycle begins with the end of Harvest: restarts, the inlet water valve opens to refill the reservoir. As the machine makes ice, the water level in the reservoir will ultimately fall to the Harvest Level . · · · · · Condenser fan is OFF Water Inlet Valve is CLOSED Water Pump may be ON Compressor is ON Hot Gas Valve is OPEN · CME306 fills the reservoir once at the The Controller, from the start of the freeze cycle: beginning of Freeze · CME456 fills the reservoir at the beginning of freeze and one more time about ½ way through freeze. Air cooled models will switch off the fan motor a 1. Switches on the Freeze indicator light and shuts few seconds before harvest begins. Maximum (45 minutes), the Controller will shut the Water must fill the reservoir within 130 seconds or unit off. At the end of Freeze cycle: automatically try to restart in 20 minutes. The Controller checks the discharge temperature and cycles the fan(s) on every 12 seconds and off for 20 seconds (CME456) or 45 seconds (CME306) if the temperature is low. If the discharge temperature exceeds the design maximum the controller shuts the unit off. Checks for a "bin full" signal throughout the cycle. · · · · · · Water level = below harvest position Condenser fan will be off Water inlet valve will be off Water pump will be ON Compressor will be ON Hot gas valve will be off At this point Harvest begins and the AutoIQ Controller switches the Harvest indicator light ON. If the full, the first freeze cycle sequence is like this: machine is operating correctly, the reservoir water temperature will fall at a standard rate. If the discharge temperature is acceptable, the water system is checked by shutting off the water pump and determining if the water level goes up enough. If it does not, it is assumed that there is a water pump problem and the controller shuts the unit off. [. . . ] The sensor for the Discharge line is marked with a small piece of yellow tape. Do not reverse the sensors. December 1999 Page 37 CME306 & CME456 Removal and Replacement: Fan Blade and/or Fan Motor 1. Disconnect electrical power. Electrical Shock Hazard Disconnect Electrical Power Before Servicing 2. Remove the 6 sheet metal screws holding the assembly to the condenser. [. . . ]