| 摘要 |
PURPOSE:To prevent deterioration of characteristics of hot-water delivery by a method wherein a water amount correcting unit, correcting a control water amount so as to have a given water amount difference with respect to minimum operating water amount and preset cock closing deciding water amount, is provided. CONSTITUTION:A water amount operating unit 161 operates a signal from a water amount detector 6 into water amount. Water amount signal is outputted into a water amount deciding unit 162 and servomotor drive circuit 17. The water amount deciding unit 162 outputs a combustion starting signal for a combustion control circuit 22 when the water amount is 2l/min or more and outputs a combustion stopping signal when the second set water amount Q2 is 1.5l/min or less. The water amount correcting unit 164 corrects the control water amount QO' operated in a controlled water amount operating unit 163. When the control water amount QO' is less than the second set water amount Q2 added with a given amount, the control water amount QO' is outputted into the servomotor drive circuit 17 as the fourth set water amount Q4, however, when the control water amount QO' is less than the third set water amount Q1, the same amount as the third set water amount Q2 is outputted into the servomotor drive circuit 17 while the control water amount QO itself is outputted into the servomotor drive circuit 17 in case the control water amount is except above cases. |
