Service Manual

108 Part Number: 000015431 Rev 02 6/20
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 “Cycle Times/24-Hour Ice Production/
Refrigerant Pressure Charts” on page 183 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 (kPa)
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.