Manitowoc Q450 Service Technician's Handbook page 168

Contamination Cleanup Chart
Symptoms/Findings
No symptoms or suspicion
of contamination
Moisture/Air
Contamination symptoms
• Refrigeration system
open to atmosphere for
longer than 15 minutes
• 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
• 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
• Burnout deposits found
in the compressor, lines,
and other components
Required Cleanup
Procedure
Normal
evacuation/recharging
procedure
Mild contamination
cleanup procedure
Mild contamination
cleanup procedure
Severe contamination
cleanup procedure
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