Manitowoc QD0802A User Manual

Refrigeration System Section 7
7-22 Part No. 80-1100-3
DISCHARGE LINE TEMPERATURE ANALYSIS
General
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.
Regardless of ambient temperature, the freeze cycle
discharge line temperature will be higher than 160°F
(71.1°C) on a normally operating ice machine.
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 the maximum
discharge line temperature.
Discharge Line Temperature Above 160°F (71.1°C) At
End Of Freeze Cycle:
Ice machines that are operating normally will have
consistent maximum discharge line temperatures above
160°F (71.1°C).
Discharge Line Temperature Below 160°F (71.1°C) At
End Of Freeze Cycle
Ice machines that have a flooding expansion valve will
have a maximum discharge line temperature that
decreases each cycle.
Verify the expansion valve sensing bulb is 100%
insulated and sealed airtight. Condenser air contacting
an incorrectly insulated sensing bulb will cause
overfeeding of the expansion valve.
Verify the expansion valve sensing bulb is positioned
and secured correctly.

Manitowoc QD0802A Specifications

General

Brand	Manitowoc
Model	QD0802A
Category	Ice Maker
Language	English