Manitowoc CNF0201, Technician'S Handbook

Page: 107 / 120

Part Number 000015432 Rev02 5/21 107
Cycle Times/24-Hour Ice Production/
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 “Refrigeration System Diagnostics” for the
data that must be collected. This list includes: before
beginning service, ice production check, installation/
visual inspection, water system checklist, safeguards,
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. Allow system to stabilize, then
verify the pressures are within the range indicated.
• Water temperature will affect suction and discharge
pressure - 50° water temperature will result in
pressures on the lower end of the ranges specified.
90° water temperatures will result in pressures on the
upper end of the ranges specified.
Charts