User manual SCOTSMAN SCE170

[. . . ] SCE170 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 SCE170 is an ice machine that produces cubed ice on a grid type freezing surface. The cubes form into a cluster that falls into the ice storage bin where they break up into individual and small groups of cubes. The SCE170 automatically maintains the level of ice by turning on when the ice level falls, and switches off when the bin is full. [. . . ] Chemicals in the water supply, such as chlorine, cause brown stains to appear on the surface of the stainless steel parts. General Cleaning - staining is usually removed by washing the parts with ordinary cleaning powder such as Bon-Ami or Copper-Glo and water. The chlorine enters the machine from the municipal water supply. It can be removed from the water supply by using a charcoal or activated carbon water filter to treat the water to the ice machine. If staining is severe, filters of this type are recommended. Exterior Cabinet Cleaning: The exterior cabinet may be cleaned by scrubbing with soap and water. Do not use cleaners containing petroleum products. A nylon type brush may be used to scrub stubborn deposits. October 1998 Page 15 SCE170 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 is pumped up and through the water distributor tube at the top of the evaporator. From there, the water flows over freezing surface of the evaporator and back into the reservoir. Melted ice and water spills into the bin flow through a drain in the base of the bin to the exterior drain connection at the back of the cabinet. During the Harvest Cycle, the Purge valve opens, allowing the water pump to discharge water from the reservoir to the drain. At the same time water re-enters the reservoir. Very little water will flow across the evaporator during this time. Pump Discharge Tube Water Distributor Water Pump Water Inlet Valve Evaporator Reservoir WATER SCHEMATIC Purge Valve To Drain October 1998 Page 16 SCE170 Refrigeration Schematic: Freeze Cycle: 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 externally equalized 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 flowing over it. From the evaporator, the refrigerant flows back to the compressor through the suction line. REFRIGERATION SCHEMATIC: Evaporator Harvest Cycle: During the harvest cycle, the refrigerant flows from the condenser, through the discharge line to a branch in the line containing the Hot Gas Valve. This valve is Open during the harvest cycle, allowing the hot discharge gas to bypass the condenser and enter the evaporator at its inlet. The hot discharge gases warm up the evaporator enough to allow the surface of the ice frozen to the evaporator to melt. [. . . ] ·Refrigerant should not be added except as a way to determine the proper operation of the product. If the system was low on refrigerant, Torque Stem to there is a leak, and it must be found and Torque 6-8 ft. ·This system has a critical charge, it must be 8-12 ft. recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. [. . . ]