| 摘要 |
PROBLEM TO BE SOLVED: To prevent ignition failure of a burner caused by water sealing of a gas injection nozzle in a heat source machine.SOLUTION: A heat source machine 1 includes a burner 22 for burning a fuel gas, a combustion fan 21 for sending combustion air to the burner 22, a heat exchanger 23 heated by a combustion exhaust gas discharged from the burner 22 to produce hot water, and a flame detector 39 detecting presence or absence of combustion flame in the burner 22, and the burner 22 is constituted to guide a fuel gas injected from a gas injection nozzle 411 into a burner body 42 with the peripheral combustion air and to ignite and burn the same at an outer part of a burner port. The heat source machine includes an outside air temperature sensor 31 detecting a temperature of the external of a heat source machine body. When a detection temperature of the outside air temperature sensor 31 is a reference temperature or less in ignition failure where the combustion flame is not detected by the flame detector 39 in spite of executing an igniting motion, an amount of supply of the fuel gas to the burner 22 is determined to an amount of supply in water sealing which is more than that in a normal ignition, and then the igniting motion is executed again. |
