On 13 August Danfoss held an interactive webinar on the role of natural refrigerants in the wake of the delisting of several high-GWP HFCs by the U.S. EPA, with a particular focus on hydrocarbons and CO2.
“It is something that will absolutely occur. It is not that there is a restriction above 150g, it is per application. It is mostly for self-contained refrigeration units when the 150g limit comes into play… Above 150g, the EPA will look to the Underwriters Laboratories (UL) or other safety agencies to perform testing and look at industry tests to ask if it safe to go beyond there [150g]. If the UL agrees for a given application, then I would be willing to bet that the EPA would accept larger charges for A3 refrigerants.”