Part Number STH039 8/13 65
Procedure
Step
1. Determine the ice machine operating conditions.
Example:
Air temp. entering condenser: 32°C
Air temp. around ice machine: 27°C
Water temp. entering water fill valve: 21°C
2A. Refer to “Cycle Time” and “Operating temperature”
charts for ice machine model being checked. Using
operating conditions from Step 1, determine published
freeze cycle time and published freeze cycle suction
temperature.
Example:
Published freeze cycle time: 19.5 - 21.4 minutes
Published freeze cycle suction temperature: -6 to -17
2B. Compare the published freeze cycle time and
published freeze cycle suction temperature. Develop a
chart.
Example:
Published Freeze Cycle Time (minutes)
1 2 5 10 13 17 20
|||||||
-6 -8 -10 -12 -14 -16 -17
Published Freeze Cycle Suction temperature
In the example, the proper suction temperature should
be approximately -10 degrees at 5 minutes;
-14 degrees at 13 minutes.
3. Perform an actual suction temperature check at the
beginning, middle and end of the freeze cycle. Note the
times at which the readings are taken.
Example:
Thermocouples were connected to the example ice
machine and suction temperature readings taken as
follows: ________
Beginning of Freeze cycle: -1 (at 1 minute)
Middle of freeze cycle: -6 (at 10 minutes)
End of freeze cycle: -12 (at 20 minutes)
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