ARC Refrigerant Handling Licence (ARC RHL) Overview
These study notes are designed to prepare candidates for the ARC Refrigerant Handling Licence exam. The notes cover key legislation, environmental impacts, safe handling practices, system integrity, recovery procedures, and compliance documentation. Candidates should supplement these notes with official sources and verify any specific regulatory details with the relevant authority.
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 Legislation
- Environmental Impact and Refrigerant Classification
- Safe Handling, Storage, and Transport Protocols
- System Integrity, Leak Detection, and Pressure Testing
- Recovery, Reclamation, and Disposal Procedures
- Compliance Documentation and Record Keeping
Exam Snapshot and Readiness Target
Format: 80 questions, 120 minutes, pass mark 70% (practice baseline; verify with official body)
Candidate level: Entry-level technician or experienced worker seeking licence
Readiness target: Competent in safe refrigerant handling, environmental compliance, and documentation
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 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 HFCs under the Kigali Amendment
Key Notes
- The Ozone Protection and Synthetic Greenhouse Gas Management Act 1989 is the primary Australian legislation controlling the import, export, manufacture, and use of ozone-depleting substances (ODS) and synthetic greenhouse gases (SGGs).
- The Act prohibits the intentional release of ODS and SGGs into the atmosphere. Any venting during installation, service, or disposal is illegal unless for safety or during recovery.
- The Regulations specify licensing categories: Refrigerant Handling Licence (RHL) for individuals, and Refrigerant Trading Authorisation (RTA) for businesses.
- The Kigali Amendment to the Montreal Protocol mandates a phasedown of HFCs, with Australia committed to reducing HFC consumption by 85% by 2036 (from baseline).
- ARCtick is the Australian Refrigeration Council, the body authorised to administer the licensing scheme on behalf of the government.
Must Know
- Know the key provisions of the Act: prohibition on emissions, licensing requirements, record-keeping obligations.
- Understand the difference between a Refrigerant Handling Licence (individual) and a Refrigerant Trading Authorisation (business).
- Be aware of the phase-down schedule for HFCs and the implications for refrigerant availability and pricing.
- Recognise that non-compliance can result in penalties, including fines and loss of licence.
Field and Exam Application
- When servicing a system, ensure all refrigerant is recovered before opening the circuit to avoid illegal emissions.
- When purchasing refrigerant, verify that the supplier holds a valid RTA and that the refrigerant is approved for use.
- When disposing of equipment, recover refrigerant and keep records of the amount recovered and disposal method.
High-Yield Distinctions
- The Act covers both ODS (e.g., CFCs, HCFCs) and SGGs (e.g., HFCs, PFCs, SF6).
- Licensing is required for any person who handles refrigerant in the course of their work, including installation, service, repair, and disposal.
- The phase-down applies to bulk HFC imports, not to pre-charged equipment (though equipment imports are also regulated).
Common Pitfalls
- Assuming that small refrigerant releases (e.g., from purging) are acceptable - all releases are prohibited unless for safety.
- Confusing the RHL with the RTA - individuals need RHL, businesses need RTA.
- Neglecting to update records of refrigerant usage and recovery as required by the Regulations.
Review Tasks
- Read the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989 summary on the ARCtick website.
- Review the phase-down schedule for HFCs and identify which refrigerants are affected.
- Practice explaining the legal requirements for refrigerant handling to a colleague.
Environmental Impact and Refrigerant Classification
Syllabus Focus
- Ozone Depletion Potential (ODP)
- Global Warming Potential (GWP)
- ASHRAE Standard 34 refrigerant classification
- Environmental impact of different refrigerant types
Key Notes
- Ozone Depletion Potential (ODP) measures a substance's ability to destroy stratospheric ozone, relative to CFC-11 (ODP=1). CFCs have high ODP, HCFCs have lower ODP, HFCs have zero ODP.
- Global Warming Potential (GWP) measures the greenhouse effect of a substance over a 100-year period, relative to CO2 (GWP=1). HFCs have high GWP (e.g., R-404A GWP=3922).
- ASHRAE Standard 34 classifies refrigerants by safety: Group A1 (non-toxic, non-flammable), A2L (lower flammability), A2 (flammable), A3 (highly flammable), B1 (toxic, non-flammable), etc.
- Natural refrigerants (e.g., ammonia, CO2, propane) have low GWP and zero ODP but may pose toxicity or flammability risks.
- The environmental impact of a refrigerant includes both direct (leakage) and indirect (energy consumption) effects. Total Equivalent Warming Impact (TEWI) accounts for both.
Must Know
- Memorise the ODP and GWP of 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 safety group classifications and their implications for handling and system design.
- Know that high-GWP refrigerants are being phased down and replaced with lower-GWP alternatives (e.g., R-32, R-290).
Field and Exam Application
- When selecting a replacement refrigerant, consider ODP, GWP, safety classification, and compatibility with existing system components.
- When retrofitting a system from R-22 to R-407C, check that the oil (mineral oil) is compatible or needs replacement with POE oil.
- When charging a system with a flammable refrigerant (e.g., R-32), follow specific safety procedures including ventilation and no ignition sources.
High-Yield Distinctions
- ODP is only relevant for CFCs and HCFCs; HFCs have zero ODP but high GWP.
- GWP is a relative measure; CO2 has GWP=1, so refrigerants with GWP > 1000 are considered high.
- ASHRAE Standard 34 safety groups are based on toxicity (Class A: low toxicity, Class B: high toxicity) and flammability (1: non-flammable, 2L: lower flammability, 2: flammable, 3: highly flammable).
Common Pitfalls
- Assuming that zero ODP means environmentally friendly - HFCs have high GWP and are being phased down.
- Confusing GWP with ODP - they measure different environmental impacts.
- Using a refrigerant not approved for the system type (e.g., using R-290 in a system designed for R-22 without proper safety modifications).
Review Tasks
- Create a table of common refrigerants with their ODP, GWP, and safety group.
- Calculate the TEWI for a hypothetical system given leakage rate and energy consumption.
- Research the phase-down schedule for HFCs and identify which refrigerants are being phased out first.
Safe Handling, Storage, and Transport Protocols
Syllabus Focus
- Personal protective equipment (PPE)
- Cylinder handling and storage
- Transport regulations (dangerous goods)
- Emergency procedures for refrigerant leaks
Key Notes
- Always wear appropriate PPE: safety glasses, gloves (nitrile or leather), and protective clothing. For refrigerants with toxicity or flammability, additional PPE may be required (e.g., respirator, face shield).
- Refrigerant cylinders must be stored upright, secured to prevent falling, in a well-ventilated area away from heat sources and ignition sources. Cylinders should be kept below 50°C.
- Transport of refrigerant cylinders is regulated under the Australian Dangerous Goods Code. Cylinders must be properly labelled, secured, and accompanied by a dangerous goods manifest if over certain quantities.
- In case of a refrigerant leak: evacuate the area, ventilate if possible, shut off the source, and call emergency services if the leak is large or involves a toxic or flammable refrigerant.
- Never mix refrigerants in a cylinder; use dedicated recovery cylinders for each refrigerant type to avoid contamination.
Must Know
- Know the correct PPE for handling different refrigerants (e.g., ammonia requires a respirator; R-290 requires flame-resistant clothing).
- Understand cylinder colour codes and labelling requirements (e.g., green for R-134a, pink for R-410A, but colour codes vary; always check the label).
- Be aware of the maximum allowable pressure for recovery cylinders (typically 80% fill limit for liquid, and never exceed the cylinder's rated pressure).
Field and Exam Application
- When recovering refrigerant, use a recovery cylinder rated for the refrigerant type and ensure it is not overfilled (use a scale or sight glass).
- When transporting cylinders in a vehicle, secure them upright and separate from other cargo. Ensure the vehicle has proper ventilation.
- When storing cylinders on site, keep them in a designated area with signage and away from combustible materials.
High-Yield Distinctions
- Cylinder colour codes are not standardised internationally; always rely on the label and the cylinder's service pressure rating.
- Recovery cylinders must be inspected and tested every 5 years (or as per local regulations).
- Flammable refrigerants (e.g., R-290, R-32) require additional precautions: no smoking, no open flames, use of explosion-proof equipment.
Common Pitfalls
- Overfilling a recovery cylinder - can cause hydraulic rupture if liquid expands. Always leave headspace.
- Storing cylinders horizontally - can cause liquid to enter the valve and cause leakage or rupture.
- Using a cylinder not rated for the refrigerant's pressure (e.g., using a low-pressure cylinder for R-410A).
Review Tasks
- Practice reading cylinder labels and identifying the refrigerant, pressure rating, and hazard class.
- Simulate an emergency leak scenario and write down the steps to take.
- Check the Australian Dangerous Goods Code for the specific requirements for transporting refrigerant cylinders.
System Integrity, Leak Detection, and Pressure Testing
Syllabus Focus
- Leak detection methods (electronic, ultrasonic, bubble, dye)
- Pressure testing procedures (nitrogen, nitrogen-trace gas)
- System integrity checks (evacuation, standing pressure test)
- Common leak points in refrigeration systems
Key Notes
- Leak detection methods include: electronic leak detectors (heated diode, infrared), ultrasonic detectors, bubble solution (soapy water), and fluorescent dye. Each has sensitivity and application limits.
- Pressure testing should be done with dry nitrogen (or nitrogen mixed with a trace gas like R-22 or helium) to avoid moisture and flammability risks. Never use oxygen or compressed air.
- System integrity is verified by a standing pressure test: pressurise the system to the design pressure (typically 1.1 times the maximum allowable pressure) and monitor for pressure drop over a period (e.g., 24 hours).
- Common leak points: flare fittings, Schrader valves, service ports, brazed joints, shaft seals on compressors, and gaskets on flanges.
Must Know
- Know the sensitivity of different leak detectors: electronic detectors can detect leaks as small as 1 g/year; bubble solution is less sensitive (around 10 g/year).
- Understand that pressure testing with nitrogen requires a pressure regulator and relief valve to prevent overpressurisation.
- Be able to perform a vacuum decay test to check for leaks after evacuation: pull a vacuum to 500 microns, isolate the pump, and monitor the rise over time (should not exceed 500 microns in 10 minutes).
Field and Exam Application
- When commissioning a new system, perform a pressure test with nitrogen at 1.1 times the design pressure, then evacuate to remove moisture and non-condensables.
- When servicing an existing system, use an electronic leak detector to pinpoint leaks, then repair and re-test.
- When using fluorescent dye, inject a small amount into the system and use a UV light to locate leaks; ensure the dye is compatible with the refrigerant and oil.
High-Yield Distinctions
- Electronic leak detectors are sensitive but can be fooled by contaminants (e.g., oil, moisture). Ultrasonic detectors are good for pressurised systems but require a pressure differential.
- Bubble solution is simple but may not detect small leaks and can leave residue that causes corrosion.
- A vacuum decay test is more sensitive than a pressure test for detecting small leaks because the pressure differential is higher.
Common Pitfalls
- Using oxygen or compressed air for pressure testing - can cause explosion due to oil and oxygen reaction.
- Not allowing enough time for the pressure test to stabilise (temperature changes can cause pressure fluctuations).
- Over-tightening flare fittings can cause cracking; use a torque wrench if specified.
Review Tasks
- Practice using an electronic leak detector on a known leak source and note the response.
- Perform a simulated pressure test with nitrogen and record the procedure.
- Identify common leak points on a refrigeration system diagram.
Recovery, Reclamation, and Disposal Procedures
Syllabus Focus
- Refrigerant recovery methods (liquid, vapour, push-pull)
- Recovery equipment and maintenance
- Reclamation vs. recycling vs. disposal
- Disposal of refrigerant and equipment
Key Notes
- Recovery methods: liquid recovery (using a recovery machine and cylinder), vapour recovery (for small amounts), and push-pull (for large systems where liquid is transferred from system to cylinder).
- Recovery equipment must be certified to AS/NZS 4771 or equivalent, and regularly maintained (e.g., oil changes, filter replacement).
- Reclamation involves processing recovered refrigerant to meet purity standards (e.g., AHRI 700). Recycling is cleaning refrigerant for reuse on-site (e.g., oil separation, moisture removal). Disposal means destroying the refrigerant (e.g., incineration).
- Disposal of equipment: recover all refrigerant, then remove components for recycling or disposal according to local regulations. Compressors must have oil drained and disposed of properly.
Must Know
- Know the difference between recovery, recycling, and reclamation, and when each is appropriate.
- Understand that recovered refrigerant must be stored in properly labelled cylinders and cannot be mixed with other refrigerants.
- Be aware that venting refrigerant is illegal; all refrigerant must be recovered before opening the system.
Field and Exam Application
- When recovering from a system with a large charge, use the push-pull method to quickly transfer liquid refrigerant to a recovery cylinder.
- When recovering from a small system (e.g., domestic fridge), use a recovery machine and vapour recovery method.
- When disposing of a system, recover refrigerant, then remove the compressor and drain oil into a waste oil container.
High-Yield Distinctions
- Recovery is mandatory; recycling is optional and depends on the condition of the refrigerant.
- Reclamation is typically done by a specialised facility and results in refrigerant that meets virgin purity standards.
- Recovery cylinders must be evacuated before use to remove non-condensables and moisture.
Common Pitfalls
- Mixing different refrigerants in a recovery cylinder - can cause contamination and make reclamation impossible.
- Not evacuating the recovery cylinder before use - can introduce air and moisture into the recovered refrigerant.
- Overfilling the recovery cylinder - always use a scale and stop at 80% fill for liquid.
Review Tasks
- Practice connecting a recovery machine to a system and performing a liquid recovery.
- Create a flowchart for deciding whether to recycle, reclaim, or dispose of recovered refrigerant.
- Review the AS/NZS 4771 standard for recovery equipment requirements.
Compliance Documentation and Record Keeping
Syllabus Focus
- Required records for refrigerant handling
- Logbooks and service records
- Reporting requirements (e.g., annual returns)
- Audit and inspection procedures
Key Notes
- The Regulations require that any person who handles refrigerant must keep records of: type and amount of refrigerant purchased, used, recovered, and disposed of; dates and details of service; and identification of the system.
- Records must be kept for at least 5 years and be available for inspection by an authorised officer.
- Businesses with an RTA must submit an annual return to ARCtick detailing refrigerant transactions.
- Logbooks should include: system identification, refrigerant type and charge, service dates, leak test results, recovery amounts, and any repairs.
Must Know
- Know the minimum record-keeping requirements: refrigerant type, quantity, date, and activity (purchase, use, recovery, disposal).
- Understand that failure to keep records can result in penalties and loss of licence.
- Be able to complete a refrigerant logbook entry correctly.
Field and Exam Application
- When servicing a system, record the refrigerant type, amount added or recovered, and any leak checks performed.
- When purchasing refrigerant, keep the invoice and note the supplier's RTA number.
- When disposing of refrigerant, obtain a disposal certificate from the waste facility.
High-Yield Distinctions
- Records must be in English and legible; electronic records are acceptable.
- The annual return is required for RTA holders, not individual RHL holders (though individuals must still keep records).
- Authorised officers can enter premises without a warrant in some circumstances to inspect records and equipment.
Common Pitfalls
- Not recording the exact amount of refrigerant recovered - estimate is not acceptable.
- Losing records after 5 years - keep them securely.
- Failing to update records after each service visit - do it immediately.
Review Tasks
- Create a sample logbook entry for a service call.
- Review the ARCtick website for the annual return form and instructions.
- Practice explaining the record-keeping requirements to a colleague.
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 key legislation: Ozone Protection and Synthetic Greenhouse Gas Management Act and Regulations.
- Memorise ODP and GWP of common refrigerants and their safety classifications.
- Practice safe handling procedures: PPE, cylinder storage, transport, and emergency response.
- Master leak detection and pressure testing methods, including vacuum decay.
- Understand recovery methods and the difference between recovery, recycling, and reclamation.
- Know the record-keeping requirements and how to complete logbooks and annual returns.
- Verify any specific pass mark, exam format, or eligibility details with the official ARCtick website.
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.