Manitowoc Ice CM MODEL STH003 - Manual (Page 66)

66
CYCLE TIMES, 24 HR ICE
PRODUCTION AND REFRIGERANT
PRESSURE CHARTS
These charts are used as guidelines to verify correct
ice machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Refer to “OPERATIONAL ANALYSIS CHART” for
the list of data that must be collected for
refrigeration diagnostics. This list includes: before
beginning service, ice production check,
installation/visual inspection, water system
checklist, ice formation pattern, safety limits,
comparing evaporator inlet/outlet temperatures,
hot gas valve analysis, discharge and suction
pressure analysis.
• Ice production checks that are within 10% of the
chart are considered normal. This is due to
variances in water and air temperature. Actual
temperatures will seldom match the chart exactly.
• Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are
within the range indicated.