| 摘要 |
PURPOSE:To prevent a circulation pump from racing, by suspending the action of a freezeproof detector part when water is not available in a hot water reservoir. CONSTITUTION:A rustproof electrode 17 is provided within a hot water reservoir 1, rust prevention is carried out while ice is available, and a relay 22 is excited while the rust prevention is being done by a detector part 21, through which a contact point 23 is closed, operation of a freezeproof detector part 24 which is in series with the contact point 23 is made possible, and as for freezeproof operation a circulation pump 5 is driven by closing a contact point 27 with a relay 26. 11 is a heat pump unit and 18 is a transformer connected in parallel with the pump 5. |
