| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of properly making a boiling-up temperature approach a target boiling-up temperature even when performances of water circulation pumps vary with respect to each product. <P>SOLUTION: Within a range of variability of each product of the water circulation pumps, a first variation rate ΔQ1/ΔV of the first water circulation pump has a maximum value, and a second variation rate ΔQ2/ΔV of the second water circulation pump has a minimum value. When a discharge flow rate Q of the water circulation pump 12 is changed, a control signal V output to the water circulation pump 12 is determined on the basis of the first variation rate ΔQ1/ΔV, when an absolute value of the variation ΔQ of the discharge flow rate is more than a predetermined reference value ΔQK, and the control signal V output to the water circulation pump 12 is determined on the basis of the second variation rate ΔQ2/ΔV, when the absolute value of the variation ΔQ of the discharge flow rate is less than the predetermined reference value ΔQK. <P>COPYRIGHT: (C)2011,JPO&INPIT |
