138 Part Number STH025 11/16
Ice Formation Pattern
Evaporator ice formation pattern analysis is helpful in ice
machine diagnostics.
Analyzing the ice formation pattern alone cannot
diagnose an ice machine malfunction. However, when
this analysis is used along with Manitowoc’s Freeze Cycle
Refrigeration System Operational Analysis Tables, it can
help diagnose an ice machine malfunction.
Any number of problems can cause improper ice
formation.
Keep the water curtain/ice dampers in place while
checking the ice formation pattern to ensure no
water is lost.
1. Normal Ice Formation
Ice forms across the entire evaporator surface.
At the beginning of the Freeze cycle, it may appear that
more ice is forming on the inlet of the evaporator than on
the outlet. At the end of the Freeze cycle, ice formation
at the outlet will be close to, or just a bit thinner than, ice
formation at the inlet. The dimples in the cubes at the
outlet of the evaporator may be more pronounced than
those on the inlet. This is normal.
It is normal for ice thickness to vary up to 1/16” across the
surface of the evaporator. The ice bridge thickness at the
ice thickness control probe should be at least 1/8”.
The ice thickness probe must be set to maintain the ice
bridge thickness at approximately 1/8 in. If ice forms
uniformly across the evaporator surface, but does not
reach 1/8 in. in the proper amount of time, this is still
considered a normal ice fill pattern.
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