A2L Resources: Next-Gen Refrigeration

The compressor manufacturer has been moving away from horsepower ratings for a few years now. Horsepower ratings are being phased out because they don’t accurately represent how a compressor performs. Horsepower only shows the motor’s input power, not the cooling capacity of the compressor. With newer efficiency standards and the shift to A2L refrigerants, compressors are now rated by actual performance metrics—such as BTU capacity, COP, and AWEF, which give a much clearer picture of how the equipment will operate in the field. 

Yes, however, they are exclusively for PARTIAL replacement systems. Example: your customer wants to replace either the condensing unit or evaporators, NOT BOTH. If both need to be replaced, then an A2L system will have to be quoted. 

With the A2L transition, all RDT and Polarcraft equipment required an update to the rack nomenclature that identifies the new model equipment.

Along with the A2L transition, RDT made the decision to change evaporator suppliers, thus causing the model discrepancy. This change allows full integration with our Eco-Smart control platform and the system architecture used in our current refrigeration designs. The evaporator provided is engineered to meet or exceed the performance specifications of the originally selected evaporator and is fully compatible with the specified refrigeration system.

Yes, RDT offers both air-cooled and water-cooled refrigeration systems for indoor installation. However, there have been some adjustments made, which include, but are not limited to, factory installed stainless-steel housing and a field-installed refrigerant detection sensor kit.

Yes, the refrigeration system is designed in accordance with the ASHRAE 15 standard. However, ASHRAE 15 also focuses on how refrigeration systems are installed. There are calculations and code compliance requirements determined by the projects professional engineer (PE) to confirm that the installation adheres to the standard.

This will be determined by the PE on the project. In an effort to help maintain compliance, RDT provides all indoor systems with a refrigerant detection sensor capable of sending out a signal via dry contacts to whatever the PE determines is necessary.

 The architect of record or the building inspector would typically determine this classification.

Explore our continually updated blog for the latest regulatory insights.

A2L systems are engineered with additional safety, ventilation, and leak detection measures to account for the mild flammability of the refrigerant. These design differences ensure compliance with updated safety standards like UL 60335-2-89 and ASHRAE 15.

Key Differences in A2L Systems

1. Leak Detection Systems

Required in most applications using A2Ls

Monitors for refrigerant leaks in enclosed spaces

Automatically triggers alarms or system shutdown if thresholds are exceeded

2. Ventilation or Airflow Management

May require mechanical ventilation in equipment rooms or confined spaces

Prevents refrigerant concentrations from reaching flammable levels

3. Charge Size Limits

Subject to strict maximum charge amounts based on room size, application, and presence of leak detection

System design must account for these limits to stay compliant

4. Spark-Free Electrical Components

Components in areas where refrigerant may accumulate must be ignition-protected or spark-free

5. Safety Control Logic

Built-in logic shuts down compressors and activates ventilation systems automatically in the event of a leak

A2L refrigerants are low-GWP (Global Warming Potential), mildly flammable alternatives to older refrigerants like R-404A. They are essential for meeting EPA and AIM Act regulations taking effect January 1, 2026.

💡 Want to understand how this regulation impacts your operation?
[Download our full A2L Transition Guide]

Deadline: January 1, 2026
All new refrigeration systems must use compliant, low-GWP refrigerants like A2Ls by this date. Compliance is based on the installation date, not the purchase date.

📅 Need help planning your timeline?
[Grab the checklist in our free guide]

In most cases, no. Retrofitting is not allowed due to pressure and flammability differences. A full system replacement is usually required.

🛠 Not sure whether to replace or upgrade?
[Get expert advice in our A2L Transition Guide]

A2L systems require:

Proper ventilation and airflow controls

Certified leak detection systems

Tools and equipment rated for use with flammable refrigerants

🧯 Explore our safety checklist in the full guide
[See the checklist]

While upfront costs may be higher, A2L systems often deliver 5–10% energy savings compared to legacy HFC systems—providing a long-term return on investment.

⚡ Explore the energy efficiency comparison
[Download the guide]

Start sourcing compliant equipment early
Build relationships with trusted suppliers
Align early with inspectors and insurance providers

📦 Our guide walks you through every prep step
[Get the planning guide]

Yes. Most A2L installations will include:

Refrigerant shut-off valves in the suction and liquid lines, installed outside walk-ins

Control via evaporator controller with leak detection sensors

Possible requirements for fire-rated shafts or ventilation systems
Always refer to local building, mechanical, and fire codes along with ASHRAE 15.

Yes. Tools must be certified for flammable refrigerants:

Recovery machines, vacuum pumps, hoses, and gauges must be A2L-rated

Spark-proof tools are often required

Open flames or ignition sources must be avoided during service

Yes. A2L-compliant systems require:

Specially designed compressors, condensers, and expansion valves

Electrical components (e.g., contactors, pressure switches, relays, controllers) rated for A2L compatibility