Evidence shall show that knowledge has been acquired of safe working practices and recovering, pressure and leak testing, evacuating and charging refrigerants. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EJ108A Refrigerants and lubricants Evidence shall show an understanding of refrigerants and lubricants, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1 Introduction to refrigerants Purpose of refrigerant Primary, secondary and expendable refrigerants Ideal properties Pure, azeotropic, zeotropic and blend refrigerants General safety requirements and personal protection equipment T2 Relevant Acts, Regulations, Codes and Standards The ozone layer (function, ozone depleting substances) The ozone protection act and regulation State and federal agencies (Dept of the environment, water, heritage and the arts; Dept of climate change; Australian Refrigeration Council Ltd etc) State and federal licensing requirements Refrigerant handling code of practice 2007 Relevant Standards Standards philosophy and format How to read and apply a standard Equipment manufactures specifications T3 Refrigerant properties Commonly used types, including CFC, HCFC, HFC, high pressure and natural refrigerants Terms (blend, azeotrope, zeotrope, glide, CFC, HCFC, HFC, HC, bubble point, dew point, critical point, ODP, GWP etc) Typical properties and applications of the current refrigerants used in systems (boiling point, glide, composition (components), comparative latent heat performance etc) T4 Safe handling of refrigerants Refrigerant identification and the numbering system (AS 1677 part 1 sect 3) System refrigerant identification (labeling requirements, Code of Practice) Typical hazards (classification groups - AS 1677 part 1 sect 2 and handling precautions - inhalation, skin contact, cardiac sensitization, decomposition, reaction with moisture etc) Personal safety (MSDS - all common refrigerants plus phosgene, recommended PPE) Cylinders (cylinder terminology (WC, tare etc), transporting safely) Safe Filling (density and water capacity methods) Decanting methods (pumping, temperature differential etc) Recovery cylinders and their safe filling. Disposal of recovered refrigerants (including RRA) T5 Refrigeration oil Types (mineral, POE, AB etc) and their applications Basic properties (miscibility, dielectric strength, viscosity and hygroscopic abilities) Typical issues regarding compatibility (neoprene and POE, POE and mineral etc Safe handling (MSDS - POE's, Mineral, AB's - Residual acid's in used oils Applications for the various compressor lubricants used in the trade T6 Recovery and reclaim procedures Refrigerant recovery systems and procedures Vapour Liquid Recovery cylinders Disposing of recovered refrigerants Safety and general issues when recovering refrigerant T7 Pressure testing Define Pressure testing procedures and test pressures per Standards, Codes, Regulations and manufacturers requirements Safety and general issues when pressure testing refrigeration systems T8 Leak detection Leak detector types and applications (electronic, halide, bubble, ultra violet, Sulphur stick, litmus paper etc) Hazards and related safe working practices (working around rotating machinery, open flame, ultra violet light etc) Care and maintenance (delicate electronic equipment, changing sensor tip filters, changing gas cartridges etc) Calibration (auto calibrating , send to a specialist etc) Leak testing methods T9 Evacuation and dehydration Evacuation and dehydration Deep vacuum methods Triple evacuation Vacuum Measurement Instruments Drop test Vacuum Pumps Types, size and applications Use and connections Care and maintenance Safety and general issues when evacuating refrigeration systems T10 Refrigerant and oil charging Refrigerant cylinders, storage and safe handling Refrigerant charging methods Vapour Liquid Safety and general issues when charging refrigeration systems including personal protection equipment Refrigerant oil removal and addition tools, procedures and safety T11 System contamination Contaminants (Non-condensables, moisture, acids, carbon, copper etc) Effects of contamination (Acid, motor burnout, oil contamination, copper plating, seizing, RMD blockage, excessive condensing temps etc) Practices/procedures that cause contamination Methods and components use to remove contamination Filter dryers – liquid, suction, burnout Dry nitrogen Flushing agents Evacuation T12 Basic refrigeration component replacement Risks of working with refrigerants and rotating equipment Refrigerant isolation/pump down/recovery Prevention of system contamination Protection of damage to surrounding equipment/ environment Replace basic components on a refrigeration system, for example filter dryer, sight glass. Pressure testing, evacuation, checking refrigerant charge, refrigerant charging and leak detection |