| 摘要 |
The ventilation system comprises a master controller (10) connected by communication links to slave controllers (12, 14, 16, 18) that regulate the operation of individual fan units (20, 22, 24, 26). The master controller (10) transmits to the slave controllers (12, 14, 16, 18) temperature or rotational speed set points calculated to maintain within the premises desired environmental conditions. At least one slave controller (12, 14, 16, 18) is provided with a temperature sensor (72) allowing the slave controller to modulate the speed of the fan according to the local temperature. This feature is useful in situations when the master controller (10) is no longer capable of sending valid set point data to the slave controller (12, 14, 16, 18), either due to a malfunction of the master controller (10) or because the communication link is interrupted. The local temperature sensor (72) can also be used as backup to the main temperature sensor (34) of the master controller (10). Should the main temperature sensor (34) fail, the master controller reads the temperature remotely, over the communication link and this data is used to continue generating set points data that is transmitted to the slave controllers.
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