摘要 |
PURPOSE:To enable to prevent the trouble due to freezing from occurring by a method wherein a heater for prevention of freezing is put in operation only at the time when the ambient temperature is low. CONSTITUTION:The combustion controlling equipment and its safety device for gas firing hot water supply equipment or the like is equipped with a power transformer T to step down commericial supply voltage, a main and a flow controllers MC and FC, which perform operations necessary for the ignition of the burner of the hot water supply equipment in due order in response to the actuation of a water flow switch S4 and the heater FH for prevention of the freezing of water in the hot water supply equipment. In this case, when the temperature of the water in the equipment is high enough to eliminate the fear of freezing at the turning-on of a source switch 1, the power supply to the heater FH is rendered to be stopped by turning-off a water temperature switch WS. On the other hand, when the water temperature switch WS is turned on by the lowering of the temperature of the water in the equipment, the hot water supply equipment is protected from being frozen with the power supply to the heater FH. |