Evidence shall show that knowledge has been acquired of safe working practices and servicing refrigerated appliances. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EJ155A Appliance refrigeration system servicing Evidence shall show an understanding of servicing appliance refrigeration systems, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1. Major appliances encompassing: Note: Examples of major appliances are washing machines, clothes dryers, dishwashers, refrigerators, freezers, air conditioners, electrical and gas cookers and heaters Installation codes, statutory requirements and regulations Manufacturer and company installation requirements and warranty implications Site preparation and accessibility. Fixing and procedures and methods for connecting services. T2. Operation principles of major domestic appliances that use electrical, gas and/or water services and/or incorporate refrigeration encompassing: Purpose and operational options. Functions of major components. T3. Operational testing and set up procedures encompassing: Pre-start checking. Safety controls checking. Operating cycle testing and control adjustments T4. Capillary systems Requirements of Domestic Refrigeration Code of Practice. Function, types, construction, characteristics and applications encompassing: system unloading calculating system operating pressures critical length critical charge Faults leading to repair/replacement of a capillary tubes Selection of replacement capillary tubes. Procedures for commissioning and servicing a capillary tube system. T5. Appliance refrigeration systems Types, applications, construction, components and operating characteristics Typical component wear or defects Typical faults Component repair/replacement methods Manufactures’ parts catalogues and service reports T6. Retrofitting domestic refrigeration systems Reasons for retrofitting Montreal Protocol Kyoto Summit Global warming AS Codes of Practice Acts and Regulations System Analysis Equipment identification Systems options Refrigerant selection Safety considerations ANSI / ASHRAE Standard 34 AIRAH Refrigerant Selection Guide Transitional and drop in-refrigerants Medium and long term refrigerants Refrigerant selection considerations Domestic refrigeration system performance testing Refrigerant recovery, recycling or reclaim Lubricant selection considerations Retrofit procedure: Refrigerant recovery Flushing procedures Retrofit procedure for CFC/HCFC to blended refrigerants Oil and drier replacement Evacuation Refrigerant charging System labelling |