Welbilt Manitowoc NEO UDP0080A, Technician'S Handbook

Page: 102 / 180

102 Part Number STH098 06/19
OVERCHARGED SYSTEM SYMPTOMS
Suction line temperature will be slightly low during freeze
cycle 5°F (-15°C). Discharge line temperature is normal.
Actual amperage readings will be higher than nameplate
rating.
Overcharge diagnosis can be difficult. R290 ice machines
ship without access valves; Look for signs that an access
valve has previously been added. When an overcharge is
suspected remove the refrigerant and weigh in the correct
refrigerant amount.
HIGHER THAN NORMAL FREEZE CYCLE
TEMPERATURES
• A dirty filter or condenser will result in higher than
normal temperatures. Always clean the filter and
condenser before diagnosing the refrigeration system.
• Hot water entering the ice machine will result in high
suction and discharge line temperatures in the freeze
cycle.
• Inefficient Compressor
Suction and discharge temperatures will be slightly
high to high during the freeze cycle. Remove
refrigerant and weigh in the correct refrigerant
amount. If the ice machine continues to exhibit
symptoms, monitor the discharge line temperature for
a continued increase of temperature. When the ice
machine continues to make ice slowly (or makes little
to no ice and trips the internal compressor overload)
the compressor will require replacement.