A CO controller is used in a boiler, which has a theoretical maximum thermal efficiency when the combustion is exactly stoichiometric. The gun stock being mounted using the original gun stock mounting means without modification after removal of the original gun stock. The segmental disks, in each case, being arranged in pairs on an axis of rotation, are non-rotatably mutually connected along their chord-type boundaries such that corresponding straight-line guides, particularly for the working slider, are arranged in these connections. The equipment provides functions of measuring a voltage, a resistance, an inductance, capacitance, a frequency, the number of pulses, and the voltage level of a logic signal; verifying diode polarities, measuring the voltage level of a pulse signal, and modes generating a rectangular pulse train and a PWM signal by the simple combinations of two switches. The switch-to service also assigns a work queue to the work element block.