IE F-Gas Category III common mistakes
IE F-Gas Category III · Understand the traps and how to avoid them.
Treating the F-Gas leak-check frequency thresholds as a single fixed tonnage (e.g. applying the 5-tonne CO2e rule to all equipment) instead of applying the correct threshold to the correct equipment category.
Candidates memorise one number and apply it universally, forgetting that hermetically sealed, non-hermetically sealed, and specific equipment types have different CO2e thresholds and different inspection intervals.
What to do instead
Build a small decision table: equipment type -> CO2e threshold -> leak-check interval, and practise converting charge (kg) x GWP into CO2e before selecting the interval.
Confusing the record-keeping obligation with the leak-check obligation, e.g. believing a leak check must be logged only when a leak is found.
Candidates conflate 'records of checks performed' with 'records of leaks found', so they omit routine check records.
What to do instead
Learn that every leak check (including 'no leak found' results), the date, and the identity of the checker must be recorded, separately from any leak-repair records.
Using GWP values from memory that are out of date or rounded incorrectly (e.g. quoting R-410A as GWP 1000 instead of its regulatory value) when calculating CO2e.
Candidates rely on approximate figures heard in training rather than the prescribed GWP list used for compliance calculations.
What to do instead
Always use the GWP values specified in the applicable regulation/annex; practise CO2e calculations with the exact listed values for common refrigerants (R-404A, R-410A, R-134a, R-32).
Recovering refrigerant into a cylinder without checking its capacity, pressure rating, or that it is a recovery (not virgin) cylinder, and without weighing the recovered amount.
Candidates focus on the mechanical act of recovery and skip pre-checks, risking overfill, cylinder damage, or unrecorded quantities.
What to do instead
Apply a fixed pre-recovery checklist: cylinder type and pressure rating, tare weight, capacity headroom, and weighing before and after; record the recovered mass.
Describing recovery as 'pumping down until the gauge reads zero' and declaring recovery complete at atmospheric pressure.
Candidates equate zero gauge pressure with empty system, ignoring residual refrigerant and the required evacuation level for the equipment type.
What to do instead
State the required evacuation level (e.g. the specified vacuum in absolute pressure) for the system type and use a vacuum gauge, not a compound manifold gauge, to confirm completion.
Selecting the wrong safety precaution for a flammable refrigerant (A2L/A3), e.g. using standard leak-detection methods or working without ignition-source control.
Candidates apply A1 habits uniformly and do not adjust for flammability class, lower flammability limit, or ventilation requirements.
What to do instead
Learn to identify the safety class from the refrigerant designation and list the specific controls (no ignition sources, ventilation, appropriate detector, charge limits) for flammable classes.
Misidentifying ODS versus non-ODS refrigerants, e.g. classifying HCFCs as non-ODS or assuming all F-Gases deplete the ozone layer.
Candidates blur the two regulatory regimes (ODS phase-out vs F-Gas phase-down) and their different environmental mechanisms.
What to do instead
Learn the distinction explicitly: ODS (CFCs, HCFCs) damage the ozone layer and are controlled under ODS rules; HFCs are F-Gases with high GWP but no ODS effect, controlled under F-Gas rules.
Ignoring the ozone-depletion and global-warming trade-offs when comparing refrigerants, e.g. recommending a high-GWP HFC as an 'environmentally friendly' replacement for an HCFC.
Candidates focus only on removing the ODS and overlook the GWP of the replacement, or vice versa.
What to do instead
Evaluate any substitution on both ODP and GWP, and be able to state which direction each metric moves when replacing an HCFC with a given HFC or HFO.
Failing to state the required action and timescale after a leak is confirmed (e.g. repair within the specified period, re-check after repair, and record the outcome).
Candidates know a leak must be fixed but cannot recall the sequence or the follow-up verification step.
What to do instead
Memorise the leak-response sequence as an ordered list: detect, record, repair within the required timeframe, re-check to verify, and update records.
Describing leak detection only by one method (e.g. soap bubbles) and not matching the method to the situation, such as using electronic detectors in poorly ventilated spaces or on flammable refrigerants without checking suitability.
Candidates learn a single familiar technique and apply it regardless of refrigerant, location, or required sensitivity.
What to do instead
Learn a method-selection matrix (electronic detector, UV dye, soap solution, pressure test) mapped to refrigerant type, location, and sensitivity, and note where each method is unsuitable.