To an air conditioning or refrigeration system comprising a secondary loop cooling system (110) for use with a vapor compression system (120) having a bypass line (148) for bypassing a storage vessel (138) in a secondary loop system . The bypass allows the air conditioning or refrigeration system to cool more quickly. In the secondary loop cooling system, a non-combustible cooling fluid is used which is particularly useful when the refrigerant used in the vapor compression system is combustible.
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