Manitowoc UG Series, Technician'S Handbook

Page: 93 / 128

Part Number: 040006847 12/19 93
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.
• Exclude all non-refrigeration issues before diagnosing
the refrigeration system.
• Visually inspect the clearances, drains, condensers/
filters for dirt and replace the water filter.
• Verify that the water flow is uniform throughout the
evaporator.
• 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.
• Refer to “Operational Analysis Chart” for the list
of data that must be collected for refrigeration
diagnostics.
• Zero out manifold gauge set before obtaining pressure
readings to avoid mis-diagnosis.
• 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.
Charts