User manual SCOTSMAN SCE275

[. . . ] SCE275 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 SCE275 is an ice machine that produces cubed ice on a vertical freezing surface. The cubes fall into the ice storage bin where they break up into individual cubes. The SCE275 automatically maintains the level of ice by turning on when the ice level falls, and switches off when the bin is full. [. . . ] The inlet water valve will stay on and open for a predetermined fraction of the time it took to fill the reservoir. This overflows and rinses the reservoir water. During the Harvest Cycle, ice will be falling from the evaporators and between the bin control's electric eyes. The harvest cycle's length is based on the actual time from the start of the prior harvest cycle until the last cube fell, plus an added amount of time as a margin. The maximum harvest cycle time allowed is 8 minutes. Harvest time is varied by the AutoIQ Controller based on the prior harvest cycle's length. If no cubes fall (or are sensed) by the end of Maximum Harvest Time, the controller senses a refrigeration error. If the next cycle also produces a refrigeration error, the machine Shuts Down. Note: The last Harvest cycle before shutting off on Bin Full will be longer than normal (4-5 minutes). During a harvest cycle, the water pump will shut off when the bin sensors indicate that the bin is full. Note: The machine will not restart for 4 minutes after switching off on Bin Full, unless the freeze button is pressed. Diagnostic Lights: There are two diagnostic lights, one to indicate a water problem, and the other to indicate a refrigeration problem. If a Diagnostic Water Light Refrigeration Light: Light Blinks once and Water pump did Very long ice repeats not start harvest Blinks twice Lack of water No harvest of and repeats fill ice Blinks three not used High discharge times and temperature repeats Is On all the Water valve Check for low time leaking thru discharge rapidly temperature or long freeze cycle Both On all the Check for thermistor set time unplugged or failed Restarts: The controller will attempt to restart the ice machine after the first and second shut downs because of a water or refrigeration error. There will be a 50 minute interval between restarts. The controller will try to refill the reservoir about every 20 minutes after shutting down for lack of water. Harvest errors: The controller must sense two consecutive harvest errors in order to stop the machine. The controller will try to operate the machine two additional times before a manual reset is needed. January 2003 Page 19 SCE275 Sanitizing and Water System Cleaning Cleaning Schedule: Scrub the door and frame edges once a week with soap and water. Clean the water system and air cooled condenser a minimum of twice per year. If in an area of high mineral concentration in the water supply, clean water system 4 times a year. This ice machine will perform at its best when kept clean. There are three areas to keep clean: The water system including the water reservoir, distributors and evaporator surface; the bin controls; and the air cooled condenser filter and the condenser itself. Grill Screws Air Filter (air cooled only): The air filter is located in a slot between the condenser fins and the condenser fans. Remove the grill on the left front of the unit. Water cooled units: The water cooled condenser may, over time and under certain water conditions, become internally restricted by minerals. [. . . ] ¤ Install a sight glass between the manifold and the suction side hose and carefully meter liquid into the suction side, using the manifold valve to "flash off" the liquid before it enters the ice machine. Do this until the proper amount of refrigerant has been weighed into the system. When the system is serviced, a special liquid line drier is required. It is included with replacement compressors. R-404A is not compatible with mineral oil, so these ice machines use Polyolester oil. [. . . ]