Discharge Line Temperature Analysis - Manitowoc SD0302A Technician's Handbook

Discharge Line Temperature Analysis

GENERAL
Knowing if the discharge line temperature is
increasing, decreasing or remaining constant can be
an important diagnostic tool. Compressor discharge
line temperature on a normally operating ice machine
steadily increases throughout the freeze cycle.
Ambient air temperatures affect the discharge line
temperature.
Higher ambient air temperatures at the condenser
and/or higher inlet water temperature = higher
discharge line temperatures at the compressor.
Lower ambient air temperatures at the condenser and/
or lower supply water temperature= lower discharge
line temperatures at the compressor.
Regardless of ambient and water temperatures, the
freeze cycle discharge line temperature will be higher
than 150°F (66°C) [S850/S1000 Air & Water Machines
Only - 140°F (60°C)] at the end of the freeze cycle.
PROCEDURE
Connect a temperature probe on the compressor
discharge line with-in 6" of the compressor and
insulate.
Observe the discharge line temperature for the last
three minutes of the freeze cycle and record on the
table.
Discharge Line Temperature Above 150°F (66°C)
[S850/S1000 Air & Water Machines Only - 140°F
(60°C)] At End Of Freeze Cycle:
Ice machines that are operating normally will have
consistent minimum discharge line temperature of
150°F (66°C) [S850/S1000 Air & Water Machines Only
- 140°F (60°C)].
122 Part Number 80-1479-3 7/10
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