Manitowoc S0850M Installation Use And Care Manual

Also see for S0850M: Service manual

Manitowoc S0850M Installation Use And Care Manual Manual pdf 18 page image

Ice Machine Operation Section 33-2 Part Number 80-1560-3Sequence Of OperationNOTE: The toggle switch must be in the ice position andthe water curtain must be in place on the evaporatorbefore the ice machine will start.INITIAL START-UP OR START-UP AFTERAUTOMATIC SHUT-OFF1. Water PurgeBefore the compressor starts, the water pump and waterdump solenoid are energized for 45 seconds, tocompletely purge the ice machine of old water. Thisfeature ensures that the ice making cycle starts withfresh water.The harvest valve(s) is also energized during waterpurge, although it stays on for an additional 5 seconds(50 seconds total on time) during the initial refrigerationsystem start-up.2. Refrigeration System Start-UpThe compressor starts after the 45 second water purge,and it remains on throughout the entire Freeze andHarvest Sequences. The water fill valve is energized atthe same time as the compressor. The harvest valve(s)remains on for 5 seconds during initial compressor start-up and then shuts off.At the same time the compressor starts, the condenserfan motor (air-cooled models) is supplied with powerthroughout the entire Freeze and Harvest Sequences.The fan motor is wired through a fan cycle pressurecontrol, therefore it may cycle on and off. (Thecompressor and condenser fan motor are wired throughthe contactor. As a result, anytime the contactor coil isenergized, the compressor and fan motor are suppliedwith power.)FREEZE SEQUENCE3. PrechillThe compressor is on for 30 seconds (60 seconds initialcycle) prior to water flow, to prechill the evaporator. Thewater fill valve remains on until the water level probe issatisfied.4. FreezeThe water pump restarts after the prechill. An even flowof water is directed across the evaporator and into eachcube cell, where it freezes. The water fill valve will cycleon and then off one more time to refill the water trough.When sufficient ice has formed, the water flow (not theice) contacts the ice thickness probe. Afterapproximately 10 seconds of continual water contact,the harvest sequence is initiated. The ice machinecannot initiate a harvest sequence until a 6 minutefreeze lock has been surpassed.