Importance

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Abstract

A water heater is disclosed having a main burner for heating a heat exchanger and a standing burner, and is also provided with an electromagnetic safety valve which is opened by a manual operation member and which is kept in its valve open condition by the electric current from a thermocouple element exposed to the standing burner and a water pressure sensitive member such that it opens in response to a supply of water to the heat exchanger (that is, the water flow is turned on). Both the electromagnetic safety valve and the water pressure sensitive valve are interposed in a fuel passage connected to the main burner. A standing burner fuel passage is connected on one end to the standing burner and is connected at its other end to a point located in between the two valves. Additionally there is provided a control circuit which has a capacitor, a discharging circuit for the capacitor having a solenoid operating the electromagnetic safety valve, and a changeover switch adapted to be switched by the manual operation member for charging or to the discharging circuit for discharging. A subsidiary discharge circuit for the capacitor is further provided having a switch which is interposed therein, and adapted to be closed when the supply of water to the heat exchanger is on. The subsidiary discharging circuit is in parallel with the foregoing discharging circuit, and a resistance is interposed between the two discharging circuits. Thus, when the control switch is closed and the subsidiary discharging circuit conducts, the solenoid does not become actuated and the electromagnetic safety valve is closed.

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First Claim