The refrigerant transition just gained another option.

ComStar International has introduced RS-20, designated R-480A, as a lower-GWP alternative to R-134a. 

The refrigerant has a global warming potential of 291, compared with roughly 1,430 for R-134a.

That represents an approximately 80% reduction. 

The Big Difference Is the A1 Rating

Many newer lower-GWP refrigerants fall into the A2L category.

R-480A carries an A1 classification — non-flammable with low toxicity. 

That could make it attractive in applications where refrigerant flammability creates additional design or operational concerns.

Existing R-134a Equipment May Be Able to Use It

ComStar says RS-20 can replace R-134a in many existing systems without changing major equipment components.

Existing expansion devices and controls can remain in place, and an oil change is generally not required in a typical conversion where the existing lubricant is compatible. 

That is potentially significant for the installed base.

EPA Has Approved Applicable Uses

RS-20 is approved under the EPA’s SNAP program for applicable new-equipment and stationary retrofit applications.

It is also approved for retrofit use in motor-vehicle air conditioning. 

Applications cited by ComStar include:

Chillers.

Healthcare systems.

Refrigerated transportation.

Other R-134a equipment.

Performance Is Designed to Stay Close

ComStar says the refrigerant was engineered to operate similarly to R-134a.

Under comparable testing, the company reported cooling capacity of approximately 2,545 Btuh for RS-20 versus 2,507 Btuh for R-134a. 

Manufacturer claims should still be evaluated against the specific equipment and application.

Contractor Takeaway

The refrigerant transition is becoming less binary.

It is not simply R-134a versus an A2L replacement.

R-480A gives equipment owners and manufacturers another path: much lower GWP while retaining an A1 non-flammable classification.