| 摘要 |
An electric boiler control system, comprising: a series circuit, connected to a power supply source, said series circuit comprising: a heating element, dipped in a water of said boiler; a thermostat employing a first switch, adapted to open when a temperature of said water reaches a first level, and to close when said temperature falls under a second level, wherein said second level is less than said first level; a second switch, serially connected to said first switch; a mechanism for keeping said second switch closed while said series circuit is closed, and keeping said switch open, until closed by a user; a first button, for closing said second switch by a user; and a second button, for opening said second switch by a user. |
