Harvest Valve Analysis - Manitowoc SD0302A Technician's Handbook

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Harvest Valve Analysis

Symptoms of a harvest valve remaining partially open
during the freeze cycle can be similar to symptoms of
either an expansion valve or compressor problem. The
best way to diagnose a harvest valve is by using
Manitowoc's Ice Machine Freeze Cycle Refrigeration
System Operational Analysis Table.
Use the following procedure and table to help
determine if a harvest valve is remaining partially open
during the freeze cycle.
1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the harvest valve(s).
Feeling the harvest val ve ou tlet or a cross the
harvest valve it
comparison.
The ha rvest valve outlet i s on the suctio n sid e
(cool refrigerant). It may be cool enough to tou ch
even if the valve is leaking.
3. Feel the compressor discharge line.
4. Compare the temperature of the inlet of the
harvest valves to the temperature of the
compressor discharge line.
The inlet of the ha rvest val ve and th e compressor
discharge l ine could b e h ot en ough to burn your
hand. Just touch them momentarily.
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Part Number 80-1479-3 7/10