| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump unit and a heat pump type water heater equipped with the heat pump unit capable of detecting the occurrence of a low voltage abnormality of a power source as early as possible to stop an active filter and reducing a risk of causing an overvoltage and an overcurrent when the low voltage abnormality is restored, compared to a conventional one. <P>SOLUTION: The heat pump unit is constituted to stop the active filter and a compressor almost simultaneously (Figs.3(e) and (f)) when an input voltage V11 (Fig.3(b)) to the active filter (a boosting means) reaches a preset lower limit voltage (e.g., 230V) or lower (time t31 in Fig.3). <P>COPYRIGHT: (C)2009,JPO&INPIT |
