| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce loss cost by preventing wasteful replacement of components by clarifying the cause of abnormality in protection of high pressure. <P>SOLUTION: This control device of a heat pump type water heater comprises a switch means 2 at one side of an AC input line for switching on/off the AC line, a pressure switch 15 for switching on/off according to a state of refrigerant pressure, a control portion 10 for operating and controlling a signal of the pressure switch, a switch cutoff means 16 connected to input a signal to the control portion and to cut off the switch means by a circuit not passing through the control portion, and resistors 17, 18 disposed on power sources of the switch means and the pressure switch, and the abnormality of a printed board power source circuit is determined when a voltage value divided by the resistors is less than a prescribed value. <P>COPYRIGHT: (C)2008,JPO&INPIT |
