Analyzing Suction Line Temperature - Welbilt Manitowoc NEO UDE0065A Technician's Handbook

ANALYZING SUCTION LINE TEMPERATURE

The suction line temperature gradually drops throughout
the freeze cycle. The actual suction temperature (and drop
rate) changes as the air and water temperature entering
the ice machine changes. These variables also determine
the freeze cycle times. To analyze and identify the proper
suction temperature drop throughout the freeze cycle,
compare the published suction temperature to the
published freeze cycle time.
NOTE: Analyze discharge temperature before analyzing
suction temperature. High or low discharge temperature
may be causing high or low suction temperature.
1. Determine the ice machine operating conditions:
Air temperature entering condenser
Air temperature around ice machine
Water temperature entering sump trough
Use the operating conditions determined in step 1 to find
the published normal suction temperatures.
Freeze Cycle
Harvest Cycle
2. Perform an actual suction temperature check.
Beginning of Cycle
Middle of Cycle
End of Cycle
3. Compare the actual suction temperature (Step 3) with
the published suction temperature (Step 2).
The suction temperature is normal when the actual
temperature falls within the published temperature range
for the ice machine's operating conditions. It is normal for
the suction temperature to be higher at the beginning of
the freeze cycle, then drop through out the freeze cycle.
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Freeze Cycle
Temperature
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Part Number 000014797 Rev02 05/19
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Harvest Cycle
Temperature
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