Manitowoc S300, Technician'S Handbook

Page: 122 / 300

122 Part Number 80-1479-3 7/10
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)].