The partially or fully automatically controlled burner is adjusted with infinite modulation within a defined control range via a servomotor (8) by means of electrical signals. The adjusted burner output corresponds as closely as possible to the momentary heat requirement of the heating plant. The controller (7) according to the invention is integrated in the burner and receives the actual running time signals, records them and compares them with a preset reference running time value, and when required emits an electrical correction signal for an ON or OFF motion to the servomotor (8), which is adjusted by fuel/air setting elements via a gas/air linkage rods. A change in the actual burner running time to the preset reference running time thus results, with a modulated matching of the burner output to the heat requirement. The controller (7) can according to the invention be equipped with a single chip microprocessor which produces the required electrical displacement signals for the modulated burner control by constantly comparing the actual running time with the preset reference running time by means of automatically proceeding computation operations, and passes them to the servomotor (8). For practical use, an on/off signal of the usual boiler thermostat is sufficient to make possible the method of working, according to the invention as described above, of the controller (7) with microprocessor. In Fig. 1, the controller (7), integrated with the burner, is shown in a diagram of a commercial modulated fan burner. IMAGE
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