Manitowoc Indigo Series Technician's Handbook page 135

Analyzing Discharge Pressure in the Freeze Cycle
1. Determine the ice machine operating conditions:
Air temp. entering condenser______
Air temp. around ice machine______
Water temp. entering sump trough______
2. Refer to Operating Pressure table (starting on
page 225) for ice machine being checked.
Use the operating conditions determined in step 1
to find the published normal discharge pressures.
Freeze Cycle______
Harvest Cycle______
3. Perform an actual discharge pressure check.
1 Minute into the
Freeze Cycle
Middle of Freeze Cycle
End of Freeze Cycle
4. Compare the actual discharge pressure (step 3)
with the published discharge pressure (step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range
for the ice machine's operating conditions. It is
normal for the discharge pressure to be higher at
the beginning of the Freeze cycle (when load is
greatest), then drop throughout the Freeze cycle.
Part Number STH025 02/12
Freeze Cycle
psig (kPa)
__________
__________
__________
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