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The RBU-5 is a 5 stage backup system functioning in two distinct capacities. In the event of general failure of the controller the RBU-5 will operate according to the settings for the current temperature. Another roll of the RBU-5 is monitoring the temperature readings using thermostats. If the temperature will rise/fall above/below the thermostat settings, the backup system will take control and use Fans/Heaters to stabilize the house.