ARC Refrigerant Trading Authorisation (ARC RTA) Overview
These study notes are designed to prepare candidates for the ARC Refrigerant Trading Authorisation (ARC RTA) exam. The exam assesses knowledge of ozone protection legislation, refrigerant chemistry, containment and recovery procedures, system commissioning, safe handling of flammable and high-pressure refrigerants, and inventory management. The notes are based on official sources including ARCtick, AIRAH, ASHRAE, and relevant codes. Candidates should verify specific pass marks, fees, and eligibility with the official ARCtick website.
For Technical Conquer practice planning, this module is tracked as 80 questions over about 120 minutes with a listed pass mark of 70%. Treat those numbers as practice baselines and verify the current official format before scheduling.
How This Guide Is Organized
The sections below turn the syllabus into studyable subject blocks. Read a subject first, explain the must-know ideas without notes, then use questions, flashcards, and mind maps to test whether the knowledge holds under field-style pressure.
- Ozone Protection and Synthetic Greenhouse Gas Management Legislation
- Refrigerant Chemistry and Environmental Impact Assessment
- Refrigerant Containment and Recovery Procedures
- System Commissioning, Dehydration, and Leak Detection
- Safe Handling of Flammable and High-Pressure Refrigerants
- Inventory Management and Compliance Documentation
Exam Snapshot and Readiness Target
Format: 80 questions, 120 minutes, pass mark 70% (practice baseline; verify with ARCtick)
Candidate level: Entry-level for technicians seeking refrigerant trading authorisation in Australia
Readiness target: Demonstrate understanding of regulatory requirements, safe handling, and environmental responsibilities
Most candidates should budget at least 36+ focused study hours, then adjust upward for unfamiliar equipment, code, regulatory, commissioning, controls, or calculation-heavy content.
Ozone Protection and Synthetic Greenhouse Gas Management Legislation
Syllabus Focus
- Ozone Protection and Synthetic Greenhouse Gas Management Act 1989
- Ozone Protection and Synthetic Greenhouse Gas Management Regulations 1995
- ARCtick licensing requirements
- Phase-down of hydrofluorocarbons (HFCs)
- Reporting and record-keeping obligations
Key Notes
- The Act controls the import, export, manufacture, and use of ozone-depleting substances (ODS) and synthetic greenhouse gases (SGGs).
- Refrigerant trading authorisation is required to handle, acquire, or dispose of scheduled refrigerants.
- HFC phase-down is managed through a quota system; only authorised persons can purchase HFCs.
- Records of refrigerant purchases, sales, and disposals must be kept for at least 5 years.
- Penalties apply for non-compliance, including fines and loss of authorisation.
Must Know
- Know the difference between ODS (e.g., CFCs, HCFCs) and SGGs (e.g., HFCs, PFCs).
- Understand the licensing tiers: full, restricted, and split system (if applicable).
- Be aware of the ban on venting refrigerants; all refrigerants must be recovered.
- Know the reporting requirements for annual returns to the Clean Energy Regulator.
Field and Exam Application
- When servicing a commercial chiller, ensure the refrigerant is recovered using certified equipment and records are logged.
- When purchasing R-410A, verify the supplier checks your ARC authorisation number.
- When decommissioning a system, complete a disposal certificate and retain for 5 years.
High-Yield Distinctions
- ODS vs SGG: ODS deplete ozone; SGGs have high global warming potential (GWP).
- Full authorisation allows handling all refrigerants; restricted may limit to certain types.
- The Act is federal; state regulations may impose additional requirements.
Common Pitfalls
- Assuming venting is allowed for natural refrigerants (it is not; all refrigerants must be recovered).
- Failing to keep records for the full 5-year period.
- Not realising that the phase-down affects availability and cost of HFCs.
Review Tasks
- Review the key sections of the Ozone Protection Act (sections 13, 14, 38).
- Practice completing a refrigerant log sheet.
- Check the ARCtick website for current licensing categories.
Refrigerant Chemistry and Environmental Impact Assessment
Syllabus Focus
- Ozone depletion potential (ODP)
- Global warming potential (GWP)
- Refrigerant classification (ASHRAE Standard 34)
- Environmental impact of common refrigerants
- Alternative refrigerants and natural refrigerants
Key Notes
- ODP measures ozone depletion relative to R-11 (ODP=1). CFCs have high ODP; HCFCs lower; HFCs zero ODP.
- GWP measures warming effect relative to CO2 over 100 years. High-GWP refrigerants (e.g., R-404A, GWP 3922) are being phased down.
- ASHRAE Standard 34 classifies refrigerants by toxicity (A: lower, B: higher) and flammability (1: no flame, 2: lower, 3: higher).
- Natural refrigerants (e.g., R-744 (CO2), R-717 (ammonia), R-290 (propane)) have low GWP but may be flammable or toxic.
- Blends (e.g., R-410A, R-407C) have temperature glide; must be charged as liquid to avoid fractionation.
Must Know
- Memorise ODP and GWP values for common refrigerants: R-12 (ODP 1, GWP 10900), R-22 (ODP 0.055, GWP 1810), R-134a (ODP 0, GWP 1430), R-410A (ODP 0, GWP 2088).
- Understand the meaning of safety group classifications (e.g., A1, A2L, B2).
- Know that blends with glide require superheat/subcooling calculations based on dew and bubble points.
- Recognise that ammonia is toxic and flammable (B2L) and requires special handling.
Field and Exam Application
- When retrofitting from R-22 to R-407C, account for glide and adjust expansion valve superheat setting.
- When selecting a refrigerant for a new supermarket system, consider GWP limits under the HFC phase-down.
- When charging a blend, always use a liquid line charging adapter to prevent composition shift.
High-Yield Distinctions
- ODP vs GWP: ODP is about ozone; GWP is about climate change.
- A1 vs A2L: A1 non-flammable; A2L mildly flammable (lower burning velocity).
- Zeotropic blends (e.g., R-407C) have glide; azeotropic blends (e.g., R-410A) behave like pure fluids.
Common Pitfalls
- Assuming all HFCs have zero ODP but forgetting they have high GWP.
- Charging a zeotropic blend as vapour, causing composition change.
- Confusing safety group letters (A vs B) with flammability numbers.
Review Tasks
- Create a table of common refrigerants with ODP, GWP, and safety group.
- Practice calculating glide for a given blend using pressure-temperature chart.
- Review ASHRAE Standard 34 safety classifications.
Refrigerant Containment and Recovery Procedures
Syllabus Focus
- Recovery equipment types and operation
- Recovery techniques (liquid, vapour, push-pull)
- Leak testing methods
- Refrigerant storage and transport
- Decommissioning procedures
Key Notes
- Recovery must achieve a vacuum of at least 100 microns (or as specified by equipment) to minimise emissions.
- Three recovery methods: liquid recovery (using pump or compressor), vapour recovery (using recovery unit), and push-pull (for large charges).
- Leak testing can be done with electronic leak detectors, ultrasonic detectors, or nitrogen pressure test (with trace gas).
- Recovered refrigerant must be stored in approved cylinders, properly labelled, and not mixed.
- When decommissioning, recover all refrigerant, isolate and cap lines, and complete a disposal certificate.
Must Know
- Know the required evacuation levels: typically 500 microns for new systems, 1000 microns for existing after repair.
- Understand that recovery cylinders must not be overfilled (max 80% liquid fill).
- Be able to perform a nitrogen pressure test: pressurise to design pressure (e.g., 150 psig for low side), hold for 15 minutes, check for drop.
- Know that electronic leak detectors are sensitive to specific refrigerants; use the correct sensor.
Field and Exam Application
- When recovering from a split system, use a recovery machine with a manifold gauge set; recover liquid first, then vapour.
- When leak testing a rooftop unit, pressurise with nitrogen and trace gas (e.g., R-22) to 150 psig, then use electronic detector.
- When storing recovered R-410A, use a cylinder rated for high pressure (400 psig) and label as 'Used R-410A'.
High-Yield Distinctions
- Recovery vs recycling vs reclaim: recovery is removal; recycling is cleaning for reuse on-site; reclaim is reprocessing to original spec.
- Push-pull method is faster for large liquid charges but requires a separate recovery unit.
- Vacuum decay test vs pressure test: vacuum test checks for moisture and non-condensables; pressure test checks for leaks.
Common Pitfalls
- Overfilling recovery cylinders, leading to hydraulic rupture.
- Using a recovery machine not rated for the refrigerant type (e.g., using a low-pressure unit for R-410A).
- Failing to change recovery unit oil when switching between refrigerant types.
Review Tasks
- Practice setting up a recovery machine and manifold for liquid and vapour recovery.
- Perform a simulated leak test using nitrogen and soap bubbles.
- Review the ARCtick code of practice for refrigerant handling.
System Commissioning, Dehydration, and Leak Detection
Syllabus Focus
- Commissioning procedures for new and repaired systems
- Dehydration methods (vacuum pump, triple evacuation)
- Leak detection techniques (electronic, ultrasonic, dye, bubble)
- System performance verification (superheat, subcooling, pressures)
- Documentation of commissioning results
Key Notes
- Commissioning includes verifying design parameters, installing correctly, leak testing, evacuating, charging, and testing operation.
- Dehydration removes moisture and non-condensables; target vacuum is below 500 microns (or as per manufacturer).
- Triple evacuation: evacuate to 1000 microns, break with dry nitrogen, repeat three times to remove moisture.
- Leak detection should be performed before charging; use nitrogen with trace gas (e.g., 10% refrigerant) for best sensitivity.
- Superheat and subcooling are calculated from pressure-temperature charts and measured temperatures to verify charge and expansion device operation.
Must Know
- Know the formula for superheat: suction line temperature minus saturation temperature at evaporator pressure.
- Know the formula for subcooling: saturation temperature at condenser pressure minus liquid line temperature.
- Understand that a micron gauge is used to measure vacuum level; ensure it is connected at the farthest point from the pump.
- Be able to interpret a pressure-temperature chart for common refrigerants.
Field and Exam Application
- When commissioning a new split system, evacuate to 500 microns, hold for 15 minutes (vacuum decay test), then charge with refrigerant.
- When troubleshooting low cooling, measure superheat: if high, indicates undercharge or restriction; if low, indicates overcharge or flooding.
- When leak testing a chiller, pressurise with nitrogen to 150 psig, add R-22 to 10 psig, then use electronic detector.
High-Yield Distinctions
- Vacuum decay test vs pressure test: vacuum decay checks for moisture; pressure test checks for leaks.
- Triple evacuation vs single: triple is more effective for removing moisture.
- Superheat is measured at evaporator outlet; subcooling at condenser outlet.
Common Pitfalls
- Not using a micron gauge and relying on compound gauge only (inaccurate).
- Charging without proper evacuation, leading to moisture and acid formation.
- Confusing superheat and subcooling readings due to incorrect pressure reference.
Review Tasks
- Practice calculating superheat and subcooling from given pressures and temperatures.
- Perform a simulated triple evacuation procedure.
- Review manufacturer commissioning checklists.
Safe Handling of Flammable and High-Pressure Refrigerants
Syllabus Focus
- Flammable refrigerant classifications (A2L, A2, A3)
- Safety precautions for handling flammable refrigerants
- High-pressure refrigerant safety (e.g., R-410A, R-744)
- Personal protective equipment (PPE)
- Emergency procedures for leaks and fires
Key Notes
- Flammable refrigerants (e.g., R-290, R-32) require special handling: no ignition sources, use explosion-proof equipment, and ensure adequate ventilation.
- A2L refrigerants (e.g., R-32) have lower flammability; still require precautions but less stringent than A3.
- High-pressure refrigerants (e.g., R-410A) operate at 1.6 times the pressure of R-22; use gauges and hoses rated for 800 psig.
- PPE includes safety glasses, gloves, and for flammable refrigerants, flame-resistant clothing and face shield.
- In case of a leak, evacuate area, ventilate, and shut off ignition sources; for high-pressure leaks, isolate and depressurise.
Must Know
- Know the maximum allowable charge for flammable refrigerants in occupied spaces per AS/NZS 5149 (e.g., R-290 limit 1.5 kg in a room).
- Understand that R-744 (CO2) has high pressure (up to 1300 psig) and can cause asphyxiation; use pressure relief devices.
- Be aware that R-32 is classified as A2L; it is used in some split systems and requires specific handling procedures.
- Know that recovery equipment for flammable refrigerants must be rated for the refrigerant and have explosion-proof components.
Field and Exam Application
- When installing an R-290 refrigerator, ensure the room has ventilation and no ignition sources within 1 metre.
- When servicing an R-410A system, use a manifold rated to 800 psig and hoses with ball valves.
- When responding to an R-32 leak, turn off power, open windows, and use a combustible gas detector.
High-Yield Distinctions
- A2L vs A3: A2L has lower burning velocity and requires less stringent safety distances.
- High-pressure vs low-pressure: R-410A requires different tools; R-744 requires even higher pressure ratings.
- Flammable refrigerants require leak detection systems in confined spaces; high-pressure refrigerants require pressure relief.
Common Pitfalls
- Using standard gauges on R-410A, causing gauge rupture.
- Not checking for ignition sources before working with flammable refrigerants.
- Assuming R-32 is safe because it is mildly flammable; still requires precautions.
Review Tasks
- Review AS/NZS 5149 for charge limits and safety requirements.
- Practice identifying the correct PPE for different refrigerant types.
- Simulate an emergency response for a refrigerant leak.
Inventory Management and Compliance Documentation
Syllabus Focus
- Refrigerant purchase and sales records
- Log books and record-keeping requirements
- Disposal certificates and waste tracking
- Compliance audits and inspections
- Reporting to regulatory bodies
Key Notes
- Records must include date, refrigerant type, quantity, supplier/customer details, and ARC authorisation numbers.
- Log books should be kept on-site and available for inspection by authorised officers.
- Disposal certificates must be completed when refrigerant is sent for reclamation or destruction.
- Annual returns must be submitted to the Clean Energy Regulator detailing refrigerant acquisitions and disposals.
- Non-compliance can result in fines, suspension, or revocation of authorisation.
Must Know
- Know that records must be retained for at least 5 years.
- Understand that refrigerant cannot be sold to unauthorised persons; verify ARC number.
- Be able to complete a refrigerant log sheet and disposal certificate.
- Know that the Clean Energy Regulator conducts random audits; be prepared to produce records.
Field and Exam Application
- When purchasing R-134a for a chiller, record the supplier's ARC number and the quantity in the log book.
- When disposing of recovered R-22, complete a disposal certificate and send with the cylinder to the reclaimer.
- When audited, present log books and disposal certificates for the past 5 years.
High-Yield Distinctions
- Purchase records vs disposal records: both required but different forms.
- Log book vs annual return: log book is ongoing; annual return is a summary.
- Authorised officer vs auditor: officer can inspect at any time; auditor may schedule.
Common Pitfalls
- Failing to record the ARC number of the supplier or customer.
- Not keeping records for the full 5 years (e.g., discarding after 3 years).
- Mixing different refrigerants in the same recovery cylinder, making reclamation difficult.
Review Tasks
- Practice filling out a refrigerant log sheet template.
- Review the ARCtick record-keeping guidelines.
- Simulate an audit by preparing a set of records for inspection.
How To Use These Notes With Practice Questions
Do not jump straight from reading to a full mock. Work by subject first: review the key notes, make a short recall sheet from memory, then answer a focused question set. After each miss, decide whether the problem was missing theory, weak code/source recall, poor measurement setup, calculation error, or a field sequence you did not visualize.
Technical Conquer's question bank, flashcards, mind maps, and spaced review tools are most useful after this instruction layer because they reveal which parts of the notes are not yet retrievable.
Final Review Checklist
- Review the Ozone Protection Act key sections and understand your obligations.
- Memorise ODP and GWP values for common refrigerants and their safety classifications.
- Practice recovery procedures: liquid, vapour, and push-pull methods.
- Master superheat and subcooling calculations and their diagnostic use.
- Know the safety requirements for flammable and high-pressure refrigerants.
- Ensure you can complete all required documentation: log books, disposal certificates, annual returns.
- Verify current pass mark, fees, and eligibility on the ARCtick website before the exam.
Official Sources and Further Reading
Use these sources as the final authority for format, eligibility, rules, regulatory limits, and exam updates. Study notes are a preparation layer, not a replacement for official candidate guidance.