124
REFRIGERATION DIAGNOSTIC PROCEDURE
1. Install and insulate a temperature lead on the
compressor suction line within 6” of the compressor.
2. Install and insulate a temperature lead on the
compressor discharge line within 6” of the
compressor.
3. All doors and panels must be in place during the
diagnostic procedure.
4. Refer to the “Cycle Times, 24 Hr. Ice Production and
Refrigerant Temperature Charts” on page 157 to
determine the correct operating temperature range
for your air and water temperature. Normal operating
temperatures will be within 10% of the data in the
charts.
5. Record the temperatures throughout the freeze and
harvest cycles and compare suction and discharge
temperatures to your model in the charts starting on
NOTE: First cycle is not used for refrigeration system
diagnostics. Run a minimum of two cycles to allow the
system to stabilize and start recording temperatures three
minutes after the second cycle starts.
Discharge Line
Temp
Suction Line
Temp
Ice Fill Pattern
Refer to
Diagnostics
for:
Normal
Normal
Less fill on the
outlet side of
the evaporator
This is normal
operation
Low (20°F
[-7°C] or more)
Low 20°F (-7°C)
or more)
Less fill on the
outlet side of
the evaporator
Expansion
Valve Flooding
Normal or
High
High 10°F
(-12°C) or
more)
Less fill on the
outlet side and
top 2 rows of
the evaporator
Low on
Refrigerant
or Expansion
Valve Starving
Normal
Low 5°F (-15°C)
or less)
Less fill on the
outlet side of
the evaporator
Refrigerant
Overcharge
Summary of Contents for Manitowoc NEO UDP0080A
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