| 摘要 |
PURPOSE:To prevent the appliance from freezing by a structure wherein a honeycomb heater is installed on the exterior part of a combustion appliance in order to introduce the hot air generated by the honeycomb heater into the appliance by means of an exhaust fan. CONSTITUTION:A water inflowing part 2, a hot water outflowing part 3 and a gas inlet part 4 are mounted on an exterior part 1. In addition, a gas block part 6, which opens and closes a gas valve and adjusts and controls the gas flow, a heat exchanger 7, which turns the water flowing in an appliance into hot water, and a gas burner 8 are provided. Further, an exhaust fan 10 to discharge combustion gas is provided above the heat exchanger 7. Furthermore, an honeycomb heater 12 is provided on the exterior part 1. When the outside air temperature or water temperature lowers down to a temperature, at which the appliance may freeze, under the state that the appliance is out of use, a freezing preventive thermoswitch turns ON, causing to run the exhaust fan at low speed and at the same time to flow current through the honeycomb heater 12 so as to introduce the hot air produced by the heat generated in the honeycomb heater 12 in a hot water supplier in order to fill the supplier with the hot air, resulting in warming a water circuit part and consequently preventing it from freezing. |
