| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent shortage of high voltage-side output to supply power to a fan motor driving circuit in pre-purge and post-purge, in a combustion device in which power is supplied to a fuel valve driving circuit from a low voltage-side output of a transformer, and power is supplied to the fan motor driving circuit for combustion from the high voltage-side output of the transformer.SOLUTION: In a case when a fan motor 51 to which power source is supplied from a high voltage-side output, is driven without driving fuel valves 41, 42 to which power is supplied from a low voltage-side output of a transformer 14, lowering of driving voltage of the fan motor 51 is prevented by outputting bleeder electric current to bleeder resistance 23 from the low voltage-side output, thus pre-purge operation and post-purge operation can be performed with proper fan motor rotating speed while suppressing increase in size of an apparatus and loss of electric power.</p> |
