122 Part Number STH098 06/19
DISCHARGE LINE TEMPERATURE ANALYSIS
Knowing if the discharge line temperature is increasing,
decreasing or remaining constant can be an important
diagnostic tool. Maximum compressor discharge line
temperature on a normally operating ice machine steadily
increases throughout the freeze cycle. Comparing the
temperatures over several cycles will result in a consistent
maximum discharge line temperature.
Ambient air temperatures affect the maximum discharge
line temperature.
Higher ambient air temperatures at the condenser = higher
discharge line temperatures at the compressor.
Lower ambient air temperatures at the condenser = lower
discharge line temperatures at the compressor.
Discharge Line Temperature Procedure
1. Connect a temperature probe on the compressor
discharge line within 6” (15.2 cm) of the compressor.
2. Observe the discharge line temperature for the
last three minutes of the freeze cycle and view the
maximum discharge line temperature.
3. Compare the maximum discharge line temperature
with the published discharge line temperature. If the
discharge line temperature is equal or higher to the
published temperature this procedure is complete.
4. Discharge line temperature is lower than published
temperature.
A. Verify the expansion valve sensing bulb is 100%
insulated and sealed airtight. Ambient air
contacting an incorrectly insulated sensing bulb
will cause overfeeding of the expansion valve.
B. Ice machines that have a flooding expansion
valve will have a maximum discharge line
temperature that decreases each cycle.
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