On March 27th 2024, BBRS passed a motion to accept one of the DXS code change proposals to the 10th edition code, and to adopt the 2022 version of ASHRAE 15. The 10th Edition code will now have an MA Amendment to update the referenced standard of ASHRAE 15 from 2019 to 2022. This is a big step towards the adoption of lower GWP A2L refrigerants in the State of Massachusetts. This does result in conflicts between the adopted ASHRAE 15 standard (2022) and the language in IMC (2021). ASHRAE 15 2022 has the latest and most recent published language surrounding refrigerants, but due to model code cycles, there is often a lag in language adoption. IMC 2024 has updated and resolved some of these conflicts, but conflicts still exist, and more updates are expected to be adopted by IMC 2027.
BBRS will also be updating the referenced UL equipment standard (UL 60335-2-40) to the latest edition (2022). UL 60335-2-40 2022 has its own language and safety requirements for all equipment using A2Ls, many of which extend into project specific design and installation of systems. All A2L equipment will be manufactured with certain safety features as per the standard, however, there are once again conflicts between UL, ASHRAE and IMC.
Please contact the DXS Refrigerant Transition Team to learn more about the remaining proposed amendments and petitions to the 10th edition code.
