ICE MACHINES Q-Model Service Manual

Section 7Refrigeration SystemSYSTEM CONTAMINATION CLEAN-UPGeneralThis section describes the basic requirements forrestoring contaminated systems to reliable service.ImportantManitowoc Ice, Inc. assumes no responsibility forthe use of contaminated refrigerant. Damageresulting from the use of contaminated refrigerant isthe sole responsibility of the servicing company.Determining Severity Of ContaminationSystem contamination is generally caused by eithermoisture or residue from compressor burnout enteringthe refrigeration system.Inspection of the refrigerant usually provides the firstindication of system contamination. Obvious moisture oran acrid odor in the refrigerant indicates contamination.If either condition is found, or if contamination issuspected, use a Total Test Kit from Totaline or a similardiagnostic tool. These devices sample refrigerant,eliminating the need to take an oil sample. Follow themanufacturer’s directions.If a refrigerant test kit indicates harmful levels ofcontamination, or if a test kit is not available, inspect thecompressor oil.1. Remove the refrigerant charge from the icemachine.2. Remove the compressor from the system.3. Check the odor and appearance of the oil.4. Inspect open suction and discharge lines at thecompressor for burnout deposits.5. If no signs of contamination are present, perform anacid oil test.Check the chart below to determine the type of cleanuprequired.Contamination/Cleanup ChartSymptoms/FindingsRequired Cleanup ProcedureNo symptoms or suspicion of contaminationNormal evacuation/recharging procedureMoisture/Air Contamination symptomsRefrigeration system open to atmosphere for longer than 15minutesMild contamination cleanup procedureRefrigeration test kit and/or acid oil test shows contaminationLeak in water-cooled condenserNo burnout deposits in open compressor linesMild Compressor Burnout symptomsOil appears clean but smells acridMild contamination cleanup procedureRefrigeration test kit or acid oil test shows harmful acid contentNo burnout deposits in open compressor linesSevere Compressor Burnout symptomsOil is discolored, acidic, and smells acridSevere contamination cleanup procedureBurnout deposits found in the compressor and lines, and inother componentsPart No. 80-1100-3 7-53