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It reduces fuel consumption, wear on boiler parts and burner emissions by actively managing the burner, in conjunction with the boiler aquastat, to properly match the boiler output to the required load. Operation After installation, setting the toggle switch on the unit to the ‘ON’ position activates the device. The LCD display indicates the various ‘modes’ of the device, and sensed temperatures. The possible messages and their explanation are: ‘STANDBY MODE’ - The boiler is operating under its