Evidence shall show that knowledge has been acquired of safe working practices and commissioning refrigeration and air conditioning systems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EJ113A Refrigeration and air conditioning commissioning procedures and requirements Evidence shall show an understanding of commissioning refrigeration and air conditioning systems, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1 Refrigeration systems operation and performance including refrigeration effect; flow rate; specific volume; system capacity; discharge temperature; total heat rejection; heat of compression and refrigerant properties and effects T2 Compressor operation and performance including: Compressor drive methods including belt drives; direct drives; speed vs. pulley size and alignment requirements. Compressor piston displacement; compressor displacement; compression ratio; compressor efficiency Methods of system capacity control including compressor unloading; refrigerant bypass; air flow; water flow; multiple units and compressor speed. T3 Air conditioning testing/measuring devices applicable to air volume, air velocity, air pressure, air temperature, air relative humidity and sound levels. T4 System design cooling/heating capacity and conditions from: System design specifications and drawings Manufacturers specifications and manuals T5 Pre-commissioning inspections and checks T6 Testing, measurements and adjustments of the system Major components Refrigerant flow controls and accessories Safety and cycling controls Refrigerant charge Air/water flow quantities T7 System operating conditions and cooling/heating capacity vs system design conditions and cooling/heating capacity T8 Marking up “as installed†drawings T9 Commissioning reports T10 Commissioning refrigeration and air conditioning systems including; Appliance refrigerated systems Cool room and freezer room systems Merchandising and display cabinets Residential air conditioning systems Package air conditioning systems T11 Retrofitting systems with a replacement refrigerant Systems and refrigerants suitable for retrofitting Retrofitting a refrigerant into a system Procedures for modify an existing system to meet the requirements of the alternative refrigerant encompassing: Evaluating performance of a system prior to being retrofitted. Testing refrigerant oil in accordance with industry standard. Reclaiming and evacuate system. Removing and replacing components. Pressure testing, evacuating and charging. Procedures for commissioning a retrofitted system to the prescribed standard Evaluating key performance factors of a system before and after a retrofit. |