Siemens LOK16.250A27 Control Box
240v
Burner controls with self-checking flame signal amplifier, for continuously operating multistage or modulating oil or gas burners of medium to high capacity; with air pressure supervision for checked air damper control.

Burner control type LOK16.250A27 features a self-checking flame supervision circuit. That supervision circuit initiates the required safety actions not only in the case of premature or missing flame signals, but also in the event of any kind of fault on the flame detector, the detector cables or the flame signal amplifier that could simulate a flame signal during burner operation.

The burner controls are therefore suited for use in all types of oil- or gas-fired combustion plants where self-checking flame supervision systems are either mandatory or recommendable:
• Burners that operate continuously
• Burners in intermittent operation that, in the case of great heat demand, may operate continuously for more than 14 hours, e.g. in plants using boiler sequencing
• Burners that need to comply with the German TRD 411 and TRD 412 regulations for steam boilers
• Burners in plants where, for specific safety requirements, supervision of the burner by a self-checking flame supervision system seems advisable

The control sequence and the connection circuitry of the LOK16… / LGK16… burner controls are identical to those of the LAL2... and LFL1... respectively (with the exception of type LFL1.148), so that existing combustion plants can also be equipped with self-checking burner controls,
• provided very good flame detector current values are measured in the plant supervised so far by the LFL1..., and
• provided the following types of flame detectors are either installed or can subsequently be fitted: