| 摘要 |
PURPOSE:To provide a controller for a hot-water supplying heater which has a single temeperature sensor and can set and control the heating temperature and the hot-water temperature independently of each other by enabling the switch for hot- water supply to regulate a proportional control valve under the hot-water supplying condition. CONSTITUTION:When the pilot flame has been lighted with the main fuel supplying valve 6 opened, turning on a heating switch 14, e.g., for heating operation, causes a proportional control circuit 16 to be energized as well as a switching circuit 24 so that a transistor Tr34 is turned on causing a resistor 25 for heating to be connected to a temperature sensor 15 in series. At the same time, a relay 18 actuates a circulating pump 20 to operate. In the control circuit 16, the detection signal obtained by the sensor 15 and resistors R35, 36 and 25 is inputted to an operational amplifier 45, where the deviation between said detection signal and the temperature set by resistors 37 and 38 is obtained and amplified in transistors Tr46 and 47 before being outputted to a proportional control valve 17 to perform temperature control. |
