Manitowoc MD0420A Technician's Handbook

Contents

Manitowoc MD0420A Technician's Handbook Manual pdf 51 page image

Part Number 040005626 5/17 51Ice Machine Does Not Cycle Into Harvestwhen Water Loses Contact with theHarvest Float SwitchNOTE: The ice machine will make a thick or doubleslab when a new freeze cycle is started with icealready present on the evaporator.Two of the most common scenarios are:• Power is cycled off/on with ice on the evaporator.• The water curtain/bin switch is opened/closed inthe harvest cycle before the ice releases.Remove all ice from the evaporator before startingdiagnostic procedures.Freeze Time Lock-In FeatureThe ice machine control system incorporates a freezetime lock-in feature. This prevents the ice machinefrom short cycling in and out of harvest. The controlboard locks the ice machine in the freeze cycle for sixminutes. After six minutes a harvest cycle can beinitiated. To allow the service technician to initiate aharvest cycle without delay, this feature is not used onthe first cycle after moving the toggle switch to OFFand back to ON.HARVEST FLOAT SWITCHICE THICKNESS FLOATSWITCH