| 摘要 |
PURPOSE:To shorten automatic hot water supplying time by storing a hot water quantity to a reference level and a hot water quantity from it to a set level, dropping hot water less by an adjusting hot water quantity than the hot water quantity to the reference level in a bathtub, confirming an adapter level or less of water level by a circulation determination, and dropping hot water more by the adjusting hot water quantity than the hot water quantity from the reference level to the set level in the bathtub. CONSTITUTION:When an automatic hot water supply switch is closed, a drop switching valve 19 is opened, waters are conveyed bidirectionally by an additional burning circuit 2 to drop hot water of quantity of (Q1-qt) from a hot water circuit 3 in a bathtub 1. The Q1 is hot water quantity when a hot water level exceeds a level of a bath adapter 4, and the (Q1-qt) is hot water quantity when the hot water level becomes a bath adapter level or less to become a circulation determination OFF. That is, the qt is an adjusting hot water quantity for lowering the hot water level from a reference level to the bath adapter level or less (e.g., 30 liters). If the circulation determination is OFF, no remaining water exists or small quantity of remaining water exists in the bathtub 1 when the automatic switch is pressed. Accordingly, waters are continuously conveyed bidirectionally by the circuit 2 to drop the hot water of (Q2+qt) from the circuit 3 to the bathtub 1. Thus, the hot water can be stored to a set level in short time. |
