Part Number 80-1505-3 6/11 163
HARVEST VALVE ANALYSIS
The valve can fail in two positions:
• Valve will not open in the Harvest cycle.
• Valve remains open during the Freeze cycle.
Valve will not open in the Harvest cycle
Although the circuit board has initiated a Harvest
cycle, suction and discharge pressures remain
unchanged from the Freeze cycle. The ice machine
will remain in the Harvest cycle for 3.5 minutes (7
minutes Quad Evaporators), then initiate a new
Freeze cycle. After three consecutive Harvest cycles
of 3.5 minutes (7 minutes Quad Evaporators) the ice
machine will stop on a safety limit #2.
Valve remains open in the Freeze cycle
Symptoms of a harvest valve remaining partially open
during the Freeze cycle can be similar to symptoms of
an expansion valve, float valve or compressor
problem. Symptoms are dependent on the amount of
leakage in the Freeze cycle.
A small amount of leakage will cause increased freeze
times and an ice fill pattern that is normal.
As the amount of leakage increases, the length of the
Freeze cycle increases and the amount of ice on the
bottom of the evaporator decreases.
A small amount of leakage will cause an audible
indication as the vapor passes through the valve. As
the size of the leak increases, the audible indication
becomes more apparent.
Refer to the Parts Manual on our website
(http://www.manitowocice.com/service/
partsmanuals.asp) for proper valve application. If
replacement is necessary, use only “original”
Manitowoc replacement parts.
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