| 摘要 |
<p>A gas burner arrangement particularly for a fully pre-mix burner for a condensing boiler comprises a main gas burner 1 and an associated pilot gas burner 9, flame detector electrodes 11,12 for monitoring flames produced by the main and pilot gas burners 1 and 9 respectively, and a flame detector 17 operable on the outputs from the flame detector electrodes for monitoring main and pilot flames, an arrangement 20,21 being provided for changing the sensitivity of the flame detector 17 in dependence upon whether a main flame or a pilot flame is being monitored. <IMAGE></p> |
