Manitowoc Ice S1800 System Contamination CLEAN-UP, Determining Severity Of Contamination

Models: S1800

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Section 7

Refrigeration System

 

 

SYSTEM CONTAMINATION CLEAN-UP

General

This section describes the basic requirements for restoring contaminated systems to reliable service.

Important

Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.

Determining Severity Of Contamination

System contamination is generally caused by either moisture or residue from compressor burnout entering the refrigeration system.

Inspection of the refrigerant usually provides the first indication of system contamination. Obvious moisture or an acrid odor in the refrigerant indicates contamination.

If either condition is found, or if contamination is suspected, use a Total Test Kit from Totaline or a similar diagnostic tool. These devices sample refrigerant, eliminating the need to take an oil sample. Follow the manufacturer’s directions.

If a refrigerant test kit indicates harmful levels of contamination, or if a test kit is not available, inspect the compressor oil.

1.Remove the refrigerant charge from the ice machine.

2.Remove the compressor from the system.

3.Check the odor and appearance of the oil.

4.Inspect open suction and discharge lines at the compressor for burnout deposits.

5.If no signs of contamination are present, perform an acid oil test.

Check the chart below to determine the type of cleanup required.

Contamination/Cleanup Chart

Symptoms/Findings

Required Cleanup Procedure

No symptoms or suspicion of contamination

Normal evacuation/recharging procedure

Moisture/Air Contamination symptoms

 

Refrigeration system open to atmosphere for longer than 15

 

minutes

Mild contamination cleanup procedure

Refrigeration test kit and/or acid oil test shows contamination

 

Leak in water-cooled condenser

 

No burnout deposits in open compressor lines

 

Mild Compressor Burnout symptoms

 

Oil appears clean but smells acrid

Mild contamination cleanup procedure

Refrigeration test kit or acid oil test shows harmful acid content

No burnout deposits in open compressor lines

 

Severe Compressor Burnout symptoms

 

Oil is discolored, acidic, and smells acrid

Severe contamination cleanup procedure

Burnout deposits found in the compressor and lines, and in

 

other components

 

Part Number 80-1634-3

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Manitowoc Ice S1800 service manual System Contamination CLEAN-UP, Determining Severity Of Contamination