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47
ANALYZING DISCHARGE PRESSURE
1. Determine the ice machine operating conditions:
Air temp. entering condenser ______
Air temp. around ice machine ______
Water temp. entering sump trough______
2. Refer to Cycle Times/24 Hour Ice
Production/Refrigeration Pressure Chart 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.
Freeze
Cycle PSIG
Harvest
Cycle PSIG
Beginning
of Cycle
__________ __________
Middle of
Cycle
__________ __________
End of
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
through out the freeze cycle.