Why CFC domestic refrigerators of 375 grams charge and above of R12 should not be retrofitted with HC blends?
The LFL is 35grams/cu m for HC refrigerant. Assuming a factor of safety of 4, this figure is further reduced to 8 grams/cu m of given space. In a typical room in an Indian home, of 3 X 3 X 2.5 m as shown in the example in the manual, the maximum permissible HC present can be 8 X 3 X 3 X 2.5 = 180 grams of HCs. A refrigerant charge of about 450 grams R12 translates into 180 grams of equivalent HC blend charge. However this will hold good if the entire HC charge of 180 grams were to be uniformly dispersed in the room. This never happens in practice as HC is heavier and stratifies in the room, leading to the possibility of reaching the LFL level at some strata. To be still safer therefore and considering the possibility of even smaller rooms, the upper limit has been kept at 375 grams of CFC for Domestic refrigerators.
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