F-Gas Compliance Checklist for AC Engineers

F-Gas compliance is a legal requirement for any engineer working with fluorinated greenhouse gases in the UK. Non-compliance carries significant penalties — including fines, loss of certification, and prohibition from handling refrigerants. This checklist covers the key compliance requirements for UK AC engineers working on the installation, servicing, and maintenance of refrigeration and air conditioning systems.

This guide reflects the current position under the UK F-Gas Regulation (as retained and amended post-Brexit) and references the EU F-Gas Regulation (EU) 2024/573 where relevant for engineers working across both jurisdictions.

1. Certification and Qualifications

Engineer Certification

Any engineer handling fluorinated refrigerants in the UK must hold a valid F-Gas qualification issued by an accredited body. The most widely held qualification is City & Guilds 2079, which covers:

• Category I — all refrigeration, air conditioning, and heat pump equipment (no capacity limit)
• Category II — hermetically sealed equipment up to 3kg charge
• Category III — stationary refrigeration equipment up to 3kg charge
• Category IV — stationary refrigeration equipment up to 3kg charge (domestic)

Note: City & Guilds 2079 Categories I–IV relate to stationary refrigeration, air conditioning, and heat pump (RACHP) systems. Mobile air conditioning (MAC) — such as vehicle AC — is covered by separate qualifications and schemes (e.g. IMI MAC). For most commercial HVAC and split system work, Category I is the required qualification. Ensure your certification card is current and not expired.

Company Certification

Companies undertaking F-Gas activities must hold a valid company F-Gas certificate issued by an approved certification body (such as Refcom, ACRIB, or equivalent). Individual engineer certification alone is not sufficient for commercial operations — the company must also be certified.

Checklist:

• ☐ Engineer holds valid Category I (or appropriate category) F-Gas qualification
• ☐ Company holds valid F-Gas company certificate
• ☐ Certification documents are available on site if requested
• ☐ Certification renewal dates are tracked and not lapsed

2. Refrigerant Handling Requirements

Recovery Before Work

Refrigerant must be recovered before any work that would release it to atmosphere. Venting fluorinated refrigerants is illegal under UK F-Gas regulations. Recovery must be performed using equipment rated for the refrigerant type — including A2L-rated recovery machines for R32 systems.

Recovery Cylinders

Use dedicated, correctly labelled recovery cylinders for each refrigerant type. Never mix refrigerants in a recovery cylinder. Cylinders must be within their test date and must not be overfilled beyond 80% capacity.

A2L Refrigerants (R32, R1234yf) and A3 Refrigerants (R290)

R32 is now the dominant refrigerant for new residential split system installations across the UK. As an A2L (mildly flammable) refrigerant, R32 requires specific tooling and safety precautions. R1234yf is also classified A2L and is primarily used in mobile air conditioning applications.

R290 (propane) is classified as A3 (highly flammable) — a significantly higher flammability risk than A2L refrigerants. R290 systems require strict adherence to additional safety requirements beyond those applicable to A2L refrigerants, including tighter charge limits, enhanced ventilation, and elimination of all ignition sources.

For A2L systems (R32, R1234yf), requirements include:

• Vacuum pump suitable for use with mildly flammable refrigerants — look for spark-free/brushless motor design and manufacturer confirmation of A2L suitability (note: "A2L-rated" is widely used as a descriptor but is not a single standardised legal certification; always verify manufacturer suitability statements)
• A2L-compatible recovery machine
• Adequate ventilation during handling
• No ignition sources in the immediate work area
• Awareness of charge size limits in occupied spaces

Checklist:

• ☐ Refrigerant recovered before any work that would cause release
• ☐ Dedicated recovery cylinders used per refrigerant type, correctly labelled
• ☐ Recovery cylinders within test date and not overfilled
• ☐ Tooling confirmed as suitable for the refrigerant flammability class (A2L or A3 as applicable)
• ☐ Ventilation requirements observed when handling flammable refrigerants

3. Leak Checking Requirements

Mandatory Leak Check Thresholds

Under UK F-Gas regulations, systems containing fluorinated refrigerants above certain charge thresholds must be leak checked at defined intervals. The thresholds are expressed in tonnes of CO2 equivalent (tCO2e):

Systems fitted with an approved automatic leak detection system have their check frequency halved.

Calculating tCO2e

Multiply the refrigerant charge weight (kg) by the refrigerant's GWP, then divide by 1,000.

Example: 10kg R410A (GWP 2,088) = 10 × 2,088 / 1,000 = 20.88 tCO2e — annual leak check required.

Example: 10kg R32 (GWP 675) = 10 × 675 / 1,000 = 6.75 tCO2e — annual leak check required.

Leak Check Method

Leak checks must be carried out using appropriate leak detection equipment. Electronic refrigerant detectors, UV dye, and bubble solution are all acceptable methods. The method used must be recorded.

Checklist:

• ☐ System tCO2e calculated and leak check frequency determined
• ☐ Leak checks carried out at required intervals
• ☐ Leak detection method recorded
• ☐ Any leaks found repaired and system re-checked within 1 month of repair
• ☐ Automatic leak detection system noted if fitted (halves check frequency)

4. Record Keeping Obligations

What Must Be Recorded

Operators of systems containing 5 tCO2e or more of fluorinated refrigerant must maintain records for each system. Records must be kept for a minimum of 5 years and must include:

• Quantity and type of refrigerant installed
• Quantity of refrigerant added during servicing
• Quantity of refrigerant recovered
• Identity of the company and engineer who performed work
• Dates of all leak checks and results
• Details of any leaks found and repairs carried out
• Whether the system is decommissioned

Who Is Responsible

The operator (the person or organisation with control of the system) is legally responsible for maintaining F-Gas records. As an engineer, you are responsible for providing accurate records of all work carried out to the operator.

Checklist:

• ☐ System logbook or digital record maintained for each system ≥5 tCO2e
• ☐ All refrigerant additions and recoveries recorded with quantities
• ☐ Engineer and company identity recorded for all work
• ☐ Leak check dates and results recorded
• ☐ Records retained for minimum 5 years
• ☐ Records available for inspection if requested by enforcement authority

5. Refrigerant Phase-Down — 2024 Regulation Updates

UK F-Gas Regulation

The UK retained and amended EU F-Gas regulations post-Brexit. The UK operates its own HFC phase-down schedule, which reduces the total quantity of HFCs that can be placed on the UK market over time. This creates quota pressure on high-GWP refrigerants including R410A (GWP 2,088) and R404A (GWP 3,922).

Key implications for engineers:

• R410A supply is subject to quota restrictions — prices will increase as supply tightens
• New equipment using R410A is being phased out by manufacturers
• R32 (GWP 675) is the primary transition refrigerant for residential AC
• Lower-GWP alternatives (R454B, R466A, R1234yf) are entering the commercial market

EU F-Gas Regulation (EU) 2024/573

For engineers working on systems in EU member states or on equipment manufactured for EU markets, the new EU F-Gas Regulation (EU) 2024/573 introduced stricter requirements from 2024 onwards, including:

• Accelerated phase-down of high-GWP HFCs
• Bans on placing new equipment using refrigerants above specific GWP thresholds on the EU market from defined dates
• Tighter restrictions on servicing existing high-GWP systems

UK engineers working on EU-market equipment or in EU jurisdictions should verify current requirements under (EU) 2024/573 directly with the relevant national authority.

Checklist:

• ☐ Aware of UK HFC phase-down quota implications for R410A and R404A supply
• ☐ New installations specified with low-GWP refrigerants where possible
• ☐ EU F-Gas (EU) 2024/573 requirements checked for any EU-jurisdiction work
• ☐ Refrigerant transition roadmap understood for ongoing service contracts

6. Commissioning Compliance

Pressure Testing

All new installations must be pressure tested with OFN (oxygen-free nitrogen) before evacuation and charging. Test pressures must meet manufacturer specifications — R32 systems require higher test pressures than R410A. See our full guide: Nitrogen Pressure Testing for HVAC Systems.

Evacuation

Systems must be evacuated to the manufacturer's specified micron level before charging. Use a vacuum pump rated for the refrigerant type and verify with a digital micron gauge. See our full guide: How to Evacuate an AC System Correctly.

Charging

Charge to the manufacturer's specified weight using calibrated refrigerant charging scales. Record the quantity charged. Do not charge by pressure alone.

Checklist:

• ☐ Nitrogen pressure test completed and passed before evacuation
• ☐ System evacuated to manufacturer's specified micron level
• ☐ Vacuum decay test performed and passed
• ☐ Refrigerant charged to manufacturer's specified weight
• ☐ Charge quantity recorded in system logbook
• ☐ Post-charge leak check performed

7. Handover and Documentation

On completion of installation or major service, provide the operator with:

• System logbook entry covering all work performed
• Refrigerant type and charge weight
• Pressure test and evacuation records
• Leak check record
• Engineer and company certification details
• Next scheduled leak check date (if applicable)

Checklist:

• ☐ System logbook completed and handed to operator
• ☐ All commissioning records provided
• ☐ Next leak check date communicated to operator
• ☐ Operator advised of their F-Gas record keeping obligations

Frequently Asked Questions

Do I need F-Gas certification to work on R32 systems?

Yes. R32 is a fluorinated refrigerant and F-Gas certification is required to handle it. Category I qualification covers all refrigerants including R32. Tooling suitable for use with A2L refrigerants is also required for R32 work.

What is the leak check threshold for F-Gas compliance?

Systems containing 5 tCO2e or more of fluorinated refrigerant must be leak checked at least annually. Systems with 50 tCO2e or more require checks every 6 months. Calculate tCO2e by multiplying charge weight (kg) by GWP and dividing by 1,000.

How long must F-Gas records be kept?

A minimum of 5 years. Records must include refrigerant quantities, leak check dates and results, engineer and company details, and details of any repairs.

Is R410A being banned in the UK?

R410A is not banned outright but is subject to HFC phase-down quota restrictions that are reducing supply and increasing prices. New equipment using R410A is being phased out by manufacturers. Existing R410A systems can continue to be serviced.

What happens if I vent refrigerant to atmosphere?

Venting fluorinated refrigerants is illegal under UK F-Gas regulations. Penalties include significant fines and potential loss of F-Gas certification. Refrigerant must always be recovered using appropriate equipment before any work that would cause release.

Related HVAC Commissioning Guides

• R32 vs R410A — What Engineers Need to Know — GWP, A2L safety, pressure differences, and tooling requirements
• Nitrogen Pressure Testing for HVAC Systems — OFN test pressures and standing test procedure
• How to Evacuate an AC System Correctly — full evacuation procedure including micron targets
• Mastercool vs Javac Vacuum Pumps — vacuum pump comparison for A2L refrigerant systems
• Common HVAC Commissioning Mistakes — evacuation, pressure testing, and charging errors to avoid

F-Gas Compliance Equipment

• Leak Detection Equipment — electronic detectors and UV dye kits for F-Gas leak checks
• Vacuum Pumps — including models suitable for A2L refrigerant systems
• Javac Tools — vacuum pumps and specialist refrigeration equipment for A2L systems
• Diagnostic & Testing Tools — micron gauges and refrigerant charging scales
• Recovery Machines & Tanks — refrigerant recovery equipment for compliant handling