| 摘要 |
<p>A combustion apparatus can minimize a burner ignition failure by optimizing control on an air volume supplied during burner ignition at startup of combustion in accordance with a negative pressure state in a chamber. Further, during combustion control, the combustion apparatus detects a negative pressure state in the chamber from a flame rod current and an output of a carbon monoxide sensor to increase a supplied air volume during a period of time, in which relieving of the negative pressure state in the chamber is retarded when a combustion capacity is lowered, thereby avoiding a deficiency of the supplied air quantity. Exhaust gas can be surely discharged outside of the chamber by setting a post fan control air supply capacity after combustion in accordance with the negative pressure state in the chamber. Further, a check valve adapted to close by self-weight and open by an exhaust gas pressure is provided in an exhaust gas path to surely prevent an exhaust gas from counterflowing into the combustion chamber from an exhaust port when the chamber becomes negative in pressure. Further, a flame rod current detects the negative pressure state in the chamber and releasing of such state, and an air supply capacity of a combustion fan is correspondingly controlled to maintain an optimum air volume.</p> |
