| 摘要 |
A refrigeration installation provided with a plurality of stages having different vaporisation pressures A, B, mounted in series, and having specific usage points 1, 2, at least one of which is intended for foodstuffs kept at low temperature, comprises a safe-operation device 22 for foodstuffs kept at low temperature, which, in the event of an operational failure of a stage A of the installation having usage points 1 intended for these foodstuffs kept at low temperature, activates the motor-compressor sets of a downstream stage B of the installation so that they draw in the refrigerating vapour of the usage points 1, 2 of these two stages A, B and operate in order to provide refrigeration to the usage points predetermined as priority points, in particular those intended for the foodstuffs kept at low temperature. <IMAGE>
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