The new Australian Boundary Standards, including 500g for R290, match those in IEC 60335-2-89, edition 3.o.
Australian standards have adopted new limits on the number of A3 (flammable) and A2L (low flammability) permitted for use in commercial refrigeration equipment and ice makers in Australia and New Zealand.
The new standard (AS / NZS 60335.2.89: 2020) is “identical adoption” of IEC 60335-2-89, edition 3.0., published by the International Electrotechnical Commission in June 2019according to Standard Australian website. The new Australian / New Zealand standard replaces the previous version adopted by countries in 2010.
In IEC 60335-2-89, edition 3.0., IEC raises the charge limit for A3 (flammable) refrigerants in standalone containers to 13 times the lower flammability limit (LFL) of the cooler; for propane (R290) increased to 500 g from 150 g. The IEC standard also increases the load limit for A2 and A2L (low flammability) coolers to 1,200 g from 150 g.
Other countries around the world are also involved in adopting IEC 60335-2-89, or modifying it. In Japan, the Japan Air Conditioning and Refrigeration Industry Association (JRAIA) is working on the Japanese Industrial Standards (JIS) version of the IEC standard.
In June, UL (Underwriters Laboratories), a safety certification company based in Northbrook, Illinois (USA) that publishes tool standards for the US, released the proposed second edition of the UL 60335-2-89 standard for review, including updated cost limits for hydrocarbon coolers and A2L.
The proposed UL standard, which includes CSA (Canadian Standards Association) 60335-2-89, calls for raising the A3 load limit on commercial equipment to 13 times the LFL, but only for open equipment (without doors); it proposes increasing the load limit for closed equipment with doors and / or drawers up to eight times the flammable LFL refrigerant (300g for R290).
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