Patent ID: 7824177
Filing Date: 2010-11-02
Classification: F23N

Abstract:
1. A combustion apparatus, comprising: a burner provided in a combustion chamber; a fan that takes in combustion air from an air supply port and supplies the combustion air to the burner; a combustion control means that ignites the burner after performing prepurge, which involves exhausting air from the combustion chamber by rotating the fan for a prescribed time prior to igniting the burner; and a gas detection means that is provided between the air supply port and the fan and detects the concentration of a combustible gas, wherein the combustion control means ascertains, before starting the prepurge, whether a combustible gas of a preset maximum concentration or higher is detected by use of the gas detection means and prohibits the prepurge when a combustible gas of the maximum concentration or higher has been detected, wherein the maximum concentration is set lower than a concentration at which gas ignites.