User manual SCOTSMAN NME950

[. . . ] NME950 & FME1200 INTRODUCTION To the owner or user: The service manual you are reading 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. This machine is a modular ice system that fits a variety of Scotsman ice storage bins. It features: front service for the freezer, gear motor, control box, water reservoir, and bin control; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and R-404A as the refrigerant. TABLE OF CONTENTS FOR THE INSTALLER FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 Page 3 Page 4 Page 6 Page 7 Page 9 Page 10 Page 11 Page 13 Page 14 Page 15 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 SAMPLE BIN AND MACHINE COMBINATIONS . [. . . ] CLEAN CONDENSER FINS. January 1995 Page 18 NME950 & FME1200 MAINTENANCE AND CLEANING: Auger In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can The auger has sharp edges, handle with care. Note: Water filters can filter out suspended solids, but not dissolved solids. ``Soft'' water may not be the complete answer. Check with a water treatment specialist regarding water treatment. For more information on removal of these parts, see REMOVAL AND REPLACEMENT. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY Electrical shock hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. Turn off the water supply. To remove the auger, remove the front and top panels. Push back bail clamp holding ice chute cover to ice chute, and remove cover. Loosen band clamp under ice chute, and remove ice chute from evaporator. Remove 4 allen screws holding breaker to evaporator. Drain the evaporator by lowering and uncapping the evaporator drain hose. After the auger has been removed, allow the auger to dry: if the auger is not bright and shiny, it must be cleaned. Clean the auger and evaporator as required. Reverse to reassemble. January 1995 Page 19 NME950 & FME1200 SERVICE DIAGNOSIS: Symptom No ice is made, nothing operates Possible Cause Unit off due to no power Unit off due to master switch in OFF position. Probable Correction Restore Power Switch master switch to ON. Check water supply, filter, strainer, float valve. Check/clean ice level sensors. Unit off due to ice level sensors (photo-electric eyes) blocked. Unit off due to scale on water level sensor. Unit off due to high pressure control open. Auger motor does not turn. Clean water level sensor. [. . . ] Remove hoses from ice machine and replace all caps. January 1995 Page 30 NME950 & FME1200 CIRCUIT BOARD TESTING: These procedures require the machine to be connected to the power supply. The voltages of the electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touch anything but the tester while the unit is being checked out. Make all connections to the circuit board with the ELECTRICAL POWER OFF. [. . . ]