Service Manual

Part Number: 000015430 Rev 02 5/20 121
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).
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.
,
Caution
The inlet of the harvest valve and the compressor
discharge line could be hot enough to burn your hand.
Just touch them momentarily.