Manitowoc S Installation, Use & Care Manual

Also see for S model: Use and care manual Installation, use & care manual Service manual Installation, use & care manual Installation, use & care manual

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Manitowoc S Installation, Use & Care Manual Manual pdf 18 page image

18 Part Number 000006520 11/11Section 3OperationIce Making Sequence Of OperationNOTE: The toggle switch must be in the ice position andthe water curtain/ice dampers must be in place on theevaporator before the ice machine will start.Water Purge CycleThe ice machine purges any remaining water from thewater trough down the drain.Freeze CycleWater flows across the evaporator and the refrigerationsystem chills the evaporator. Ice builds on theevaporator until water contacts the ice thickness probe.Harvest CycleAny remaining water is purged down the drain asrefrigerant gas warms the evaporator. When theevaporator warms, the sheet of cubes slides off theevaporator and into the storage bin. If all cubes fall clearof the water curtain (or ice damper) the ice machinestarts another freeze cycle.Off CycleIf the water curtain or ice damper are held open by icecubes the ice machine shuts off. When the water curtainor ice damper closes the ice machine starts a new cycleat the water purge.Control Board TimersThe control board has the following non-adjustabletimers:• The ice machine is locked into the freeze cycle for 6minutes before a harvest cycle can be initiated.Freeze lock is bypassed after moving the toggleswitch from OFF to ICE position for the first cycleonly.• The maximum freeze time is 60 minutes at whichtime the control board automatically initiates aharvest sequence.• The maximum harvest time is 3.5 minutes for singleevaporators and 7 minutes for multiple evaporatormodel. The control board automatically initiates afreeze sequence when these times are exceeded.SAFETY LIMITSSafety limits are stored and indicated by the controlboard after three cycles. The number of cycles requiredto stop the ice machine varies for each safety limit.• Safety Limit 1 all models - If the freeze time reaches60 minutes, the control board automatically initiates aharvest cycle. If 6 consecutive 60-minute freezecycles occur, the ice machine stops.• Safety Limit 2 single evaporator models - If theharvest time reaches 3.5 minutes, the control boardautomatically returns the ice machine to the freezecycle. If 500 consecutive 3.5 minute harvest cyclesoccur, the ice machine stops.• Safety Limit 2 multiple evaporator models - If theharvest time reaches 7 minutes, the control boardautomatically returns the ice machine to the freezecycle. If 500 consecutive 7 minute harvest cyclesoccur, the ice machine stops.• Safety Limit 3 multiple evaporator models - If the lowrefrigerant pressure control opens, the ice machineshuts off and starts a 5 minute delay period. If 3consecutive low pressure events occur, the icemachine stops and flashes the harvest light.Use the following procedures to determine if the controlboard contains a safety limit indication.1. Move the toggle switch to OFF.2. Move the toggle switch back to ICE. Watch thesafety limit lights/harvest light on the control board. Ifa safety limit has been recorded, the correspondinglight will blink once, twice or three times to indicatewhich safety limit stopped the ice machine.