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The change made in this addendum allows the use ofR744 as a secondary coolant or refrigerant in certain situations.It allows limited releases of R744 to the atmosphere duringunusual events, such as an extended power failure withcoincident heat gains that would otherwise cause system pressuresto rise above component design pressures. Refrigerantvented to atmosphere during a power failure is likely to be a"de minimus" quantity compared to losses from other causessuch as normal leakage in even the best maintained commercialand industrial systems.

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Published: 2009 ANSI: ANSI Approved Number of Pages: 6 File Size: 1 file , 380 KB