User manual SCOTSMAN SLE400R

[. . . ] SLE400R 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 SLE400R is an ice machine that produces cubed ice on 6 vertical cube freezing surfaces. The SLE400R automatically maintains the level of ice by turning on when the ice level falls, and switches off when the bin is full. The refrigeration system uses R-404A as the refrigerant. Table of Contents Specifications . [. . . ] The ice should be fully formed and should be harvested within a few minutes. If needed, adjust the cube size by loosening the set screws and moving the ice thickness probe adjustment plate. Move the adjustment plate down for smaller cubes and up down for larger. For proper operation, the ice thickness should be set to the 1 11/16" diameter. The machine is designed to harvest cubes of only the correct thickness. January 1995 Page 13 Cubes Too Thin Cubes Too Thick Cube Size Diagram Correct Size & Shape 1 11/16" SLE400R Initial Start Up Note: If the first batch of cubes are not all uniform discs, some ice machine cleaner should be added to the reservoir. After ice has been harvested, but before new cubes begin to form, switch the ICE/OFF/WASH switch to WASH. Remove the splash guard, and drain the reservoir by removing the drain elbow. Replace all parts, turn on the water and move ICE/OFF/WASH switch to ICE. The machine will have to harvest all of the cubes before it goes back into the freeze cycle. Check operation of the bin control circuit by holding ice on the bin control tube in the bin. If the ice maker does not stop within 1 minute, while keeping ice on the thermostat, rotate the bin thermostat shaft counter clockwise until the ice maker does stop. Remove the ice from the capillary tube; the ice maker should restart within 2 minutes. If it does not, rotate the adjusting shaft clockwise until the machine starts. The ice machine is now ready for automatic operation. Siphon Tube Schematic U-Tube Adjusted Here = No Purge Siphon Breaker Hole Electrical Sequence: Freeze Cycle: During the first part of the freeze cycle, the ice machine compressor, fan motor and water pump are operating. Assume the bin thermostat is open (low ice), relay K1 will NOT have power thru its coil and K1 contacts 6-2 will be closed, connecting power to the ice size thermostat and the liquid line valve coil. The ice size thermostat contact 2-3 are closed, connecting power to the fan motor and the pump motor. The Harvest Termination Thermostat is closed to NC, but there is no power thru it. The ice size thermostat heater is on, and the compressor contactor coil is energized. Harvest: In the harvest cycle, the compressor is operating, and the hot gas valve is energized. The when the ice near the ice size thermostat sensing tube grows large enough to force water over the sensing tube, that tube looses heat, and at 38oF. This removes power from the water pump and remote fan and connects power to the relay coil. When the relay coil has power, it connects power to the hot gas valve coil. [. . . ] Clean water system with Scotsman Ice Machine Cleaner Clean tube with ice machine cleaner Check water supply pressure Check water supply for restrictions Check superheat, replace TXV if too high. Advise user to pour water on ice to ease removal Suggest water treatment to user. Check & replace bin control Check & replace K1 relay Cubes are wrong size/shape Compressor inefficient Ice size thermostat not adjusted properly Freeze cycle too short due to heater open Water system is restricted with minerals Ice thickness probe tube covered with minerals Not enough water Too much superheat Ice fused together in bin Ice in bin too long Too many minerals in water Bin control will not close K1 relay coil open Unit does not shut off January 1995 Page 21 SLE400R Removal and Replacement Ice Size Thermostat: Before replacing the ice size thermostat, it should be positively determined that it is at fault. Disconnect the primary resistor's yellow wire from terminal #4 and the white wire from terminal #1. [. . . ]