A2L Refrigerants: Installation and Safety

The spread of A2L refrigerants is progressively changing the work of HVACR installers and maintenance technicians in Europe . The transition to lower GWP fluids not only concerns the choice of refrigerant, but also requires greater attention to safety, circuit tightness, correct charging, tools used, and commissioning procedures.

EU Regulation 2024/573 on fluorinated gases is accelerating the phase-out of refrigerants with the highest climate impact and, at the same time, has expanded the European certification and training system to include alternatives used in refrigeration, air conditioning, and heat pump systems. Programs must also include aspects related to the safe handling of flammable, toxic, or high-pressure refrigerants.

In this context, correct installation becomes even more important: approximate practices that can compromise any refrigeration circuit take on particular weight when the refrigerant also has flammability characteristics, albeit reduced as in the case of A2L.

A2L Refrigerants: What's New for European Installers?

The A2L classification identifies refrigerants with low toxicity and reduced flammability , but their management still requires procedures consistent with the characteristics of the fluid and with the applicable technical standards.

European legislation therefore does not consider the transition to alternative refrigerants as a simple product change. EU Regulation 2024/573 establishes that training programs must cover applicable legislation, technical standards, emission prevention, and the safe management of alternatives to F-gases.

EU Implementing Regulation 2024/2215 also defines the minimum requirements for the certification of persons working on stationary refrigeration, air conditioning, and heat pumps, including installation, maintenance, repair, leak testing, and recovery activities.

For those who work with A2L equipment, the following therefore become particularly important:

• knowledge of the characteristics of the refrigerant;
• assessment of the installation environment conditions;
• correct construction and verification of joints;
• tightness control;
• use of compatible tools;
• compliance with charging and recovery procedures;
• final inspection of the system.

The quality of the installation thus takes on both a technical and safety function.

Charging, sealing and piping: errors can compromise the system

One of the most delicate areas remains the management of the refrigerant charge .

The amount of refrigerant must be determined based on the manufacturer's instructions and the actual system configuration. Adding refrigerant based solely on pressure or without considering pipe length and operating conditions can result in overcharging or undercharging.

Furthermore, with A2Ls, controlling the quantity of refrigerant takes on additional importance because the design and installation must also consider the conditions in which a possible leak could affect the rooms served.

Particular attention must also be paid to refrigeration lines . In the case of replacements or retrofits, the reuse of existing pipes must be evaluated by verifying:

• diameter and length;
• internal conditions of the circuit;
• compatibility with refrigerant and lubricant;
• quality of joints;
• absence of contamination;
• held under the expected operating conditions.

The new European certification system confirms the importance of these skills: the exams required by Regulation 2024/2215 include theoretical and practical knowledge of thermodynamics, refrigerant management, and the operations required to properly work on circuits.

Tools and procedures must be compatible with A2L

The transition also requires an update of the equipment used during the interventions .

Not all equipment designed for traditional refrigerants is automatically suitable for flammable fluids. It is therefore necessary to always check the manufacturer's declared compatibility for equipment such as:

• recovery systems;
• leak detectors;
• measuring instruments;
• vacuum pumps and related accessories;
• cylinders and containers;
• components used in charging operations.

European training places particular emphasis on the safe handling of equipment containing flammable or toxic gases or operating at high pressure.

This principle doesn't just apply to the technician working on the system. Safety must be considered from the design stage and continue throughout the equipment's life cycle, from commissioning to maintenance and decommissioning.

Commissioning and training are becoming increasingly central

With the evolution of refrigerants, it becomes even less sufficient to consider an installation completed when the system can simply start up.

Commissioning allows you to verify that the system actually functions according to the expected parameters and may include, depending on the equipment:

• refrigerant quantity control;
• pressure and temperature checks;
• superheat and subcooling control;
• leak test;
• checking safety devices;
• control configuration;
• recording of initial operating parameters.

Correct documentation also provides a reference for subsequent maintenance and facilitates the identification of any anomalies.

The European framework explicitly links training and qualification to the energy efficiency of equipment : improving the quality of installation and maintenance helps maintain the system's expected performance over time.

The A2L transition therefore also represents a professional transition. The new European system requires not only refrigerants with a lower climate impact, but technicians capable of operating correctly with different fluids and technologies.

For the European HVACR sector, training, installation procedures and safety become an integral part of the decarbonisation of refrigeration.