ELECTRONIC THERMAL-PROTECTOR FOR ELECTRIC WATER BOILERS

摘要

It is described a control device (R) which can perform heat regulation and thermal protection procedures in electric water boilers. During regular operating conditions, the beat regulation procedure is in progress and the power supply to the electrical resistances (2) is enabled or cut off by means (3) capable of preventing the passage of current inside the electrical circuit (1). In the event of anomalous operating conditions, the thermal protection procedure is activated; it shuts the circuit (1) by opening the two relays (4). As per the invention, a single electronic device (7, 8, 9, 10) receives information from one or more temperature sensors l: (6), manages said heat regulation and thermal protection procedures and decides whether the heat regulation procedure is to be maintained or whether the thermal protection procedure is to be activated by opening both relays (4). A hardware logic circuit (8) performing the function pf watch-dog (8) supervising the correctness of the operations is featured. The invention also features the possibility for the user to reset the heat regulation procedure manually once the anomaly no longer subsists and up to a maximum number of reset attempts.