Manitowoc

ChartsCycle Times, 24 Hr. Ice Production andRefrigerant Pressure ChartsThese charts are used as guidelines to verify correctice machine operation.Accurate collection of data is essential to obtain thecorrect diagnosis.• Refer to “Operational Analysis Chart” for the list ofdata that must be collected for refrigerationdiagnostics. This list includes: before beginningservice, ice production check, installation/visualinspection, water system checklist, ice formationpattern, safety limits, comparing evaporator inlet/outlet temperatures, hot gas valve analysis,discharge and suction pressure analysis.• Ice production checks that are within 10% of thechart are considered normal. This is due tovariances in water and air temperature. Actualtemperatures will seldom match the chart exactly.• Zero out manifold gauge set before obtainingpressure readings to avoid misdiagnosis.• Discharge and suction pressure are highest at thebeginning of the cycle. Suction pressure will dropthroughout the cycle. Verify the pressures arewithin the range indicated.Part Number 80-01111-9 7/10 203