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S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

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Refrigeration System Section 7<br />

DISCHARGE LINE TEMPERATURE ANALYSIS<br />

General<br />

Knowing if the discharge line temperature is increasing,<br />

decreasing or remaining constant can be an important<br />

diagnostic tool. Maximum compressor discharge line<br />

temperature on a normally operating ice machine<br />

steadily increases throughout the freeze cycle.<br />

Comparing the temperatures over several cycles will<br />

result in a consistent maximum discharge line<br />

temperature.<br />

Ambient air temperatures affect the maximum discharge<br />

line temperature.<br />

Higher ambient air temperatures at the condenser and/<br />

or higher inlet water temperature = higher discharge line<br />

temperatures at the compressor.<br />

Lower ambient air temperatures at the condenser and/or<br />

lower supply water temperature= lower discharge line<br />

temperatures at the compressor.<br />

Regardless of ambient and water temperatures, the<br />

freeze cycle discharge line temperature will be higher<br />

than 160°F (71.1°C) on a normally operating ice<br />

machine.<br />

Procedure<br />

Connect a temperature probe on the compressor<br />

discharge line with-in 6" of the compressor and insulate.<br />

Observe the discharge line temperature for the last three<br />

minutes of the freeze cycle and record the maximum<br />

discharge line temperature.<br />

Discharge Line Temperature Above 160°F (71.1°C) At<br />

End Of Freeze Cycle:<br />

<strong>Ice</strong> machines that are operating normally will have<br />

consistent maximum discharge line temperatures above<br />

160°F (71.1°C).<br />

Discharge Line Temperature Below 160°F (71.1°C) At<br />

End Of Freeze Cycle<br />

<strong>Ice</strong> machines that have a flooding expansion valve will<br />

have a maximum discharge line temperature that<br />

decreases each cycle.<br />

Verify the expansion valve sensing bulb is 100%<br />

insulated and sealed airtight. Condenser air contacting<br />

an incorrectly insulated sensing bulb will cause<br />

overfeeding of the expansion valve.<br />

Verify the expansion valve sensing bulb is positioned<br />

and secured correctly.<br />

7-16 Part Number 80-1634-3

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