–147–Cool Vapor Valve AnalysisThe valve can fail in two positions: Valve will not open in the Harvest cycle. Valve remains open during the Freeze cycle.Valve will not open in the Harvest cycleAlthough the circuit board has initiated a Harvestcycle, suction and discharge pressures remainunchanged from the Freeze cycle. The ice machinewill remain in the Harvest cycle for 3.5 minutes (7minutes QDUAL), then initiate a new Freeze cycle.After three consecutive Harvest cycles of 3.5 minutes(7 minutes QDUAL) the ice machine will stop on asafety limit #2.Valve remains open in the Freeze cycleSymptoms of a cool vapor valve remaining partiallyopen during the Freeze cycle can be similar tosymptoms of an expansion valve, float valve orcompressor problem. Symptoms are dependent on theamount of leakage in the Freeze cycle.A small amount of leakage will cause increased freezetimes and an ice fill pattern that is normal.As the amount of leakage increases, the length of theFreeze cycle increases and the amount of ice on thebottom of the evaporator decreases.A small amount of leakage will cause an audibleindication as the vapor passes through the valve. Asthe size of the leak increases, the audible indicationbecomes more apparent.Refer to the Parts Manual for proper valve application.If replacement is necessary, use only “original”Manitowoc replacement parts.
