Manitowoc QF0400 Service Manual

Also see for QC0700: Installation, use & care manual Service manual Building instructions Technician's handbook

Contents

Section 7 Refrigeration SystemPart No. 80-1214-3 7-19SYSTEM CONTAMINATION CLEAN-UPGeneralThis section describes the basic requirements forrestoring contaminated systems to reliable service.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.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.Contamination/Cleanup ChartSymptoms/Findings Required Cleanup ProcedureNo symptoms or suspicion of contamination Normal evacuation/recharging procedureMoisture/Air Contamination symptomsRefrigeration system open to atmosphere for longer than 15minutesRefrigeration test kit and/or acid oil test shows contaminationLeak in water-cooled condenserNo burnout deposits in open compressor linesMild contamination cleanup procedureMild Compressor Burnout symptomsOil appears clean but smells acridRefrigeration test kit or acid oil test shows harmful acid contentNo burnout deposits in open compressor linesMild contamination cleanup procedureSevere Compressor Burnout symptomsOil is discolored, acidic, and smells acridBurnout deposits found in the compressor and lines, and inother componentsSevere contamination cleanup procedureRevised 8/2003Downloaded from www.Manualslib.com manuals search engine