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Part Number: 000015431 Rev01 5/19 107

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 179 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.

Manitowoc IBF0820C Technician's Handbook

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