Part Number STH025 11/16 149
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 procedures to determine if a harvest
valve is remaining partially open during the freeze cycle.
SELFCONTAINED OR REMOTE CONDENSER MODELS
HARVEST VALVE ANALYSIS
1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the harvest valve(s).
Important
Feeling the harvest valve outlet or across the harvest
valve itself will not work for this comparison.
The harvest valve outlet is on the suction side (cool
refrigerant). It may be cool enough to touch 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.
n
Warning
The inlet of the harvest valve and the compressor
discharge line could be hot enough to burn your
hand. Just touch them momentarily.
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