Manitowoc Indigo Series Technician's Handbook page 138

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 211) 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.
138
Freeze Cycle
psig (kPa)
Part Number STH026 6/15