Staying Compliant: How OEMs and Operators Can Meet F-Gas Regulations with Confidence
In our previous thermal academy blog, we did a deep dive into F-gas regulations, exploring how the latest F-gas legislation is reshaping refrigerant choices and thermal system design across bus and coach, off-highway, rail, special vehicle, and stationary power sectors.
This follow-up focuses on what OEM engineers can do to stay ahead with five best practices that support compliance today while helping you prepare for the next generation of refrigerants, standards, and system architectures.
1. Stay Current with Regulations and Standards
Regulations around refrigerants are evolving rapidly, and not just in the EU and UK, but globally. Staying compliant means keeping pace with updates to F-Gas regulations, Euro emissions standards, and environmental safety directives.
This includes monitoring:
- Changes to Global Warming Potential (GWP) limits for refrigerants
- Certification requirements for handling new gases
- Sector-specific rules across public transport, off-highway, rail and stationary power applications
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For OEMs, these aren’t one-time updates, but rather they directly influence refrigerant selection, testing protocols, and long-term platform planning.
At Grayson, our team of F-Gas specialists continually track regulatory changes and emerging refrigerant technologies, ensuring the systems we design for our customers are compliant today and future-proofed for tomorrow.
2. Choose Low-GWP and Natural Refrigerants with a Long-Term Strategy
Where possible, adopting low-GWP or natural refrigerants is one of the most effective ways to maintain compliance and reduce environmental impact. Options such as R-454C, R-1234yf, R-290 (Propane), and R-744 (COâ‚‚) offer lower GWP values, however, each brings trade-offs in efficiency, compatibility, and safety that engineers must carefully assess.
We’ll be exploring these next-generation natural refrigerants in more detail in upcoming Grayson Thermal Academy deep-dives. Click here to subscribe to the Thermal Exchange so you don’t miss it.
It can be tempting to look for a direct drop-in refrigerant replacement. But long-term compliance and performance require a strategic refrigerant plan, not just a short-term fix.
This is why refrigerant strategy should be treated as a core engineering decision, not just a substitution exercise. Our engineers work directly with OEM design teams to evaluate model performance and safety under real-world duty cycles, helping identify the right balance of efficiency, serviceability, and compliance longevity.
3. Design Future-Ready Thermal Management Systems
The most effective route to long-term compliance is future-proof design. That means developing systems that can transition to next-generation refrigerants without major hardware redesigns.
Working with thermal management companies that understand the value of future-proof design is key. For example, at Grayson, we engineer our BTMS and CTMS product ranges for flexibility and refrigerant adaptability, enabling OEMs to move from refrigerants such as R407C to R454C with minimal requalification effort.
Our approach combines modular component design for easier refrigerant transitions, integrated architectures to reduce charge and potential leak points, and built-in diagnostics and CAN-based monitoring for ongoing compliance verification.
Also, designing for lower charge and reduced leak potential can offer reduce total cost of ownership and improve serviceability for operators. Under both EU and UK regulations, the CO₂-equivalent charge of a system determines its leak-checking frequency and reporting obligations – see figure 1. Lower charge systems not only simplify compliance but also improve reliability and environmental performance.
Techniques such as indirect condensing, compact heat exchangers, and integrated system layouts can significantly reduce the overall refrigerant volume required.
| Leakage Detection | Periodically Check | ||||
|---|---|---|---|---|---|
|
System WITHOUT Leakage Detection |
No Check |
Every 12 months |
Every 6 months |
Not Allowed |
|
|
System WITH Leakage Detection |
No Check |
Every 24 months |
Every 12 months |
Every 6 months |
|
|
Refrigerant Charge per Circuit (CO2 equivalent) |
< 5 ton |
5 ≤ Charge < 50 ton |
50 ≤ Charge < 500 ton |
Charge > 500 ton |
|
|
Refrigerant Charge per Circuit (kg) |
R134a (GWP 1430) |
Charge < 3.5 kg |
3.5 ≤ Charge < 34.9 kg |
34.9 ≤ Charge < 349.7 kg |
Charge > 349.7 kg |
|
R407c (GWP 1774) |
Charge < 2.8 kg |
2.8 ≤ Charge < 28.2 kg |
28.2 ≤ Charge < 281.9 kg |
Charge > 281.9 kg |
|
|
R410A (GWP 2088) |
Charge < 2.4 kg |
2.4 ≤ Charge < 23.9 kg |
23.9 ≤ Charge < 239.5 kg |
Charge > 239.5 kg |
|
|
R32 (GWP 675) |
Charge < 7.4 kg |
7.4 ≤ Charge < 74.1 kg |
74.1 ≤ Charge < 740.7 kg |
Charge >740.7 kg |
|
|
HFO R1234ze |
Charge < 2.0 kg |
2.0 ≤ Charge < 10.0 kg |
10.0 ≤ Charge < 100.0 kg |
Charge > 100.0 kg |
|
Figure 2: EU 517 / 2014 amendment 2022 F-gas Regulation – Leak Checks (“ton” means tonnes of COâ‚‚ equivalent (t COâ‚‚-eq), not metric tons of refrigerant)
For full details on regulations and laws in the UK, refer to the official GOV.UK guidance on F-gases and HCFCs.
A good example is our CTMS CM-series, which integrates multiple thermal loops within a single, sealed refrigerant circuit, reducing potential leak points and total charge while maintaining efficient temperature control across battery, power electronics, and cabin thermal loads.
4. Invest in Training, Certification, and Continuous Improvement
Even the best system designs rely on people who can maintain them safely. Ensuring that engineers and technicians are trained and certified to handle evolving refrigerants is vital for sustaining compliance and protecting operational integrity.
Training supports:
- Safe refrigerant handling and leak detection
- Proper system servicing and recovery practices
- Consistent adherence to F-Gas reporting obligations
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With over F-Gas and high-voltage certified engineers, Grayson invests heavily in internal training to ensure our teams are knowledgeable in the latest F-gas requirements. We support OEMs by sharing best practices, knowledge, and maintenance insights, and operators with expert aftermarket servicing support.
When your teams and service partners are confident in managing refrigerant systems, compliance becomes second nature, rather than a hurdle to be overcome.
Switching to alternative refrigerants is not just a case of swapping one gas for another. Engineers must reassess system design, components and controls under new operating conditions – while keeping an eye on cost, logistics and long-term serviceability.
5. Consider Total Lifecycle Performance and Serviceability
F-Gas compliance isn’t just about meeting current standards: it’s about sustaining efficiency and reliability over a product’s lifetime. OEMs should evaluate total cost of ownership (TCO), including:
- Refrigerant availability and cost trends
- Maintenance intervals and serviceability
- Technician training needs and tooling requirements
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Systems designed for reliability, efficient maintenance, and long service life help reduce downtime and lifecycle costs, while keeping emissions low and compliance intact.
Grayson’s Aftermarket and Servicing Division provides end-to-end support to ensure long-term performance:
- A dedicated 24,000 sq. ft. Aftermarket facility
- Extensive parts inventory for next-day delivery
- Over 30 mobile service engineers with HVAC expertise
- 180 kW, 3-position charging facilities for PSV and commercial vehicles
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And, importantly, we use this in-field aftermarket knowledge to help inform our thermal system designs choices for future platforms. Working with us means having a partner who can support compliance not just in design, but through service and lifetime operation.
Compliance Today, Confidence Tomorrow
Staying compliant with F-Gas regulations is about more than meeting minimum standards – it’s about building systems that are ready for the future of electrified, efficient, low-emission heavy vehicles and power systems.
We bring together F-Gas expertise, engineering capability, and lifecycle support to help OEMs navigate this complexity with confidence. Whether you’re specifying refrigerants, developing next-generation platforms, or planning long-term servicing strategies, our specialists are here to help.
Get in touch with our engineering team to see how we can support your next project, and sign up to our newsletter to stay updated as we dive deeper into natural refrigerants in the next articles of this series.
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