UEENEEJ108A Recover, pressure test, evacuate, charge and leak test refrigerants

Information

Attaching Gauges

What must be observed on your gauges before attaching them to a system? Why must an air purge be undertaken before operating the system? Describe the terms and what are the purposes of the following: Forward seated Back seated Cracked off the back seat
Attaching Gauges
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REQUIRED SKILLS AND KNOWLEDGE

 Refrigerant recovery systems and procedures
 Vapour
 Liquid
 Recovery cylinders
 Disposing of recovered refrigerants
 Safety and general issues when recovering refrigerant
What is the primary reason for recovering refrigerant? Can reclaimed refrigerant be reused? What precautions must be taken when reclaiming refrigerant to ensure no contamination occurs? What is the safe fill capacity of a reclaim bottle for waste refrigerant? What factors must be considered when filling a cylinder?
Attaching recovery unit and recovering refrigerant
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REQUIRED SKILLS AND KNOWLEDGE

 Define
 Pressure testing procedures and test pressures per Standards,
 Codes, Regulations and manufacturers requirements
 Safety and general issues when pressure testing refrigeration systems

 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
What is the purpose of pressure testing a system? What methods can be used to leak test a system? What hazards exist when pressure testing a system? At what equivalent temperature(s) are systems pressure tested to? How long should a system be pressure tested for? What maintenance can be done on an electronic leak detector?
Pressure and Leak Detecting Testing Procedure
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REQUIRED SKILLS AND KNOWLEDGE

 Evacuation and dehydration
 Deep vacuum methods
 Triple evacuation
 Vacuum Measurement
 Instruments
 Drop test
 Vacuum Pumps
 Types, size and applicatio ns
 Use and connections
 Care and maintenance
 Safety and general issues when evacuating refrigeration systems
What actually occurs in the system when it is being evacuated? Describe a "deep vacuum" Explain the triple evacuation procedure What is the purpose of triple evacuation? What instruments can be used to test the level of vacuum? What is a "drop test" What is the difference between a single stage vacuum pump and two stage vacuum pump? How often should oil in a vacuum pump be changed?
Evacuation Procedure
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REQUIRED SKILLS AND KNOWLEDGE

 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
How must refrigerant cylinders be stored? What safety precautions must be observed when utilising refrigerant cylinders? Why is it best practice to "liquid charge" systems? What precautions must be observed when liquid charging systems? When would it be appropriate to vapour charge a system? How is refrigerant oil removed from a system? How is the refrigerant oil disposed of? How is refrigerant oil replaced into a system?
Refrigerant and Oil Recharging practical assessment
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