174 Part Number Preliminary 6/11
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.
SELF-CONTAINED OR REMOTE CONDENSER
MODELS HARVEST VALVE ANALYSIS
1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the harvest valve(s).
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.
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.
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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