| 摘要 |
PURPOSE:To make it possible to measure the temperature of feed water without using a thermistor by a method wherein a hot water temperature detector and a memory circuit for storing the output of the hot water temperature detector immediately before the starting of a heat source are provided. CONSTITUTION:Water having a temperature equal to the temperature of feed water flows through a hot water temperature detecting thermistor 4 in the time interval from the time of serving hot water up to the time when a flow switch 7 goes ON, so that the feed water temperature is reached immediately before the switch 7 makes ON. In this case, a switch 13A is ON, a voltage corresponding to the temperature of the feed water is applied on a capacitor 13B in the memory circuit 13 and the output of the capacitor 13B is applied on a control circuit 12 as a feed water temperature signal through an operational amplifier 13C to thereby control the combustion of a burner 1. |
