Service manual

Refrigeration Section 8
8-4
System Contamination Clean-up
This section describes the basic requirements for
restoring contaminated systems to reliable service.
IMPORTANT
We assume 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
Either moisture or residue generally causes system
contamination 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. Follow the manufacturer’s
directions. These devices sample refrigerant,
eliminating the need to take an oil sample.
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 Reach-
In.
2. Remove the compressor from the system.
3. Check the odor and appearance of the oil.
4. Inspect the 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/Clean-up 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 prolonged periods
• Refrigeration test kit and/or acid oil test shows contamination
• Leak in water-cooled condenser
• No burnout deposits in open compressor lines
Mild contamination clean-up procedure
Mild Compressor Burnout symptoms
• Oil appears clean but smells acrid
• Refrigeration test kit or acid oil test shows harmful acid content
• No burnout deposits in open compressor lines
Mild contamination clean-up procedure
Severe Compressor Burnout symptoms
• Oil is discolored and smells acrid
• Refrigeration test kit or acid oil test shows harmful acid content
• Burnout deposits found in the compressor and lines, and in other
components
Severe contamination clean-up procedure