Good evening, according to the nomenclature established by Samsung for rotary compressors, that value of 280 must be multiplied by 100 btu / h and will give you the capacity of the compressor, in this case, 280 x 100 btu / h is equal to 28000 btu / h, that is the capacity of the compressor, the equipment is 2.5 tons; Here I leave the link, on page 21 (38 and 39 of the manual) you will find the nomenclature for Samsung rotary compressors:
https://images.samsung.com/is/content/samsung/p5/global/business/compressor/rotary-compressor/all-rotary-compressor/SAMSUNG-Compressor-Catalogue-2018.pdf
Personally, I have not managed to get a manual of Samsung R22 rotary compressors, but Samsung continues to maintain the nomenclature and always check this manual and based on the calculation already mentioned, you can determine the btu / h capacity of any Samsung rotary compressor.