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Thread: R-290 added to cascade low stage
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09-02-2012, 07:25 PM #1
R-290 added to cascade low stage
It is common practice to add a small amount of propane to the low stage in a cascade system. I know that someone, ASHRAE maybe, had defined a minimum ratio of propane to refrigerant for flammability reasons, does anyone know what that is or where I can find it in writing?