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Refrigeration Installations Course: • Refrigeration Installations. GRA Course... In this video I explain to you how the cascade refrigeration installation works, which uses R134a in the high pressure part, while the medium and low pressure uses CO2, which is pumped to the medium temperature evaporators on the one hand and expanded to the low temperature evaporators on the other. Air Conditioning Course: • Air Conditioning Installations Canal ACadenas: https://www.acadenas.com