Ude0080 Refrigeration Diagnostics - Welbilt Manitowoc NEO UDE0065A Technician's Handbook

UDE0080 Refrigeration Diagnostics

Perform the procedures on the preceding pages before
performing refrigeration diagnostics. The first pages cover
an overview of the diagnostic procedures followed by
diagnostics checklists.
Install thermometer thermocouples on Suction and
Discharge line:
• Digital thermometers with remote thermocouples
must be used to obtain temperatures.
• Suction and Discharge line thermocouples must be
within 3" (76.2 mm) of the compressor.
• Thermocouples must be insulated.
• Doors and all panels must be in place.
• Initial freeze cycle is not used for diagnostics.
• Start monitoring temperatures 3 minutes into the
second freeze cycle.
Compare Suction and Discharge temperatures to your
model in the charts starting on page 219.
The charts list normal suction and discharge temperatures.
Analysis
Discharge Line
Temp
Normal
Low (20°F
[-7°C] or more)
Normal or
High
Normal
166
Suction Line
Temp
Normal
Low 20°F (-7°C)
or more)
High 10°F
(-12°C) or
more)
Low 5°F (-15°C)
or less)
Part Number 000014797 Rev02 05/19
Ice Fill Pattern
Less fill on the
left side of the
evaporator
Less fill on the
left side of the
evaporator
Less fill on the
left side and
top 2 rows of
the evaporator
Less fill on the
left side of the
evaporator
Refer to
Diagnostics
for:
This is normal
operation
Expansion
Valve Flooding
Low on
Refrigerant
or Expansion
Valve Starving
Refrigerant
Overcharge