| 摘要 |
PURPOSE:To prevent non-uniform temprature in hot-water to be supplied, by providing a circuit which forcibly makes a burner burn for a predetermined time when supplying of hot-water is started again, even if the temperature in water near a thermistor has been raised to a set temperature. CONSTITUTION:A method of control to obtain a predetermined uniform temperature in hot-water to be supplied is as follows, after the water temperature near a thermistor 6 exceeds a set temperature (T2), and a burner 4 ceases burning after a burner 5 has stopped burning, and supplying of hot-water is once stopped, and is started again after a certain time has passed. When supplying of hot- water is started again at the time (t1), decoders 73a and 73b output signals based on the counted values (m1) and (m2), respectively, and high level signals are output from a processing circuit 74 from a counting time (m1) to a counting time (m2). As a result, signals are fed into solenoid-operated valves 31 and 41 through AND gates 35 and 45, respectively, and the burner 4 burns as long as a time (t) only. By this method, a sandwiched conditio of hot-water by cold water can be prevented, and ununiform distribution of water temperature in a heat exchanger can be dissolved. |
