User manual SCOTSMAN AF300

[. . . ] AF300 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 repair this product. The AF300 is an ice machine that produces flaked ice and stores it in a insulated bin. It automatically maintains the level of ice by turning on when the ice level falls and switches off when it is full. This unit in serviceable in place; the ice storage bin and hood may be removed from the chassis to allow service access without removing the ice machine from its installed location. [. . . ] Exterior Cabinet Cleaning: The exterior cabinet may be cleaned by scrubbing with soap and water. A nylon type brush may be used to scrub stubborn deposits. January 1993 Page 13 AF300 Maintenance and Cleaning Evaporator and Auger The bearings and water seal should be checked once per year. Locate water seal/bottom bearing area at the bottom of the evaporator and look for water leaks. If there is evidence of a leak, the bearings and the water seal will have to be replaced. Remove O-ring holding insulation halves together at the top of the evaporator. If rusty or if water is visible, replace the bearings and water seal. TOP OF EVAPORATOR AUGER BOLT CAP Ice Breaker and Auger Removal for Inspection Note: The auger can't be pulled out when the unit is installed under the counter. Remove cover from reservoir, and block the float or shut off the water supply. Remove O-ring holding insulation halves together at the top of the evaporator. Pull up on breaker pull ring to remove the ice breaker assembly, auger, and the top portion of the water seal. After the auger has dried, check condition of the auger's finish, it should be clean and shiny. Reverse all of the above to reassemble. WASHER TOP BEARING INSULATION 10. Reassemble all components. January 1993 Page 14 AF300 Water Schematic: Water flows into the ice machine from its inlet connection at the back of the cabinet, through the float valve and into the reservoir. The water in the reservoir then flows by gravity into the bottom of the evaporator. In the evaporator the water chills into ice crystals and is pushed up the evaporator by the auger. At the top of the evaporator, the ice is pressed against a restriction, called a breaker, and some of the water is squeezed out of the crystalline ice. The flaked ice then flows through the chute into the bin. WATER SCHEMATIC EVAPORATOR RESERVOIR STRAINER WATER SAFETY SWITCH RESERVOIR/EVAPORATOR DRAIN RESERVOIR OVERFLOW DRAIN BIN DRAIN January 1993 Page 15 AF300 Refrigeration Schematic: From the compressor, hot discharge gas is pumped to the condenser, either air or water cooled. At the condenser, heat from the refrigerant flows into the cooling medium, either air or water, and the refrigerant condenses into a liquid. From the condenser the liquid refrigerant flows through the liquid line to the metering device - a thermostatic expansion valve. At the thermostatic expansion valve, the liquid refrigerant passes from a high pressure zone to one of relatively low pressure, and in the low pressure zone it evaporates. The low pressure zone where the refrigerant evaporates is the evaporator. When the refrigerant evaporates, it absorbs heat from the metal parts of the evaporator and the water inside it. EVAPORATOR From the evaporator, the refrigerant flows back to the compressor through the suction line. REFRIGERATION SCHEMATIC SUCTION LINE EVAPORATOR INLET COMPRESSOR GEARMOTOR DISCHARGE LINE CONDENSER THERMOSTATIC EXPANSION VALVE January 1993 Page 16 DRYER AF300 Technical Characteristics Typical Low Side Pressure: · 27 - 31 PSIG Typical Discharge Pressure · 220-260 PSIG depending upon room air temperature (air cooled) · 220-230 PSIG water cooled. · R-22 Refrigerant Type Refrigerant Charge: · 17 ounces air cooled. [. . . ] There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700. Use conservation minded service procedures: · Refrain from checking refrigeration pressures without reason. There are many ways to determine the proper operation of a Scotsman ice machine without using refrigerant gauges. Visual inspection of the water system, observation of the ice formation, amp draw, voltage, and other techniques will lead to proper diagnosis. [. . . ]