Electrical bare wire continuous heater and method for controlling the same

Abstract

The present invention relates to an electrical bare wire continuous heater and a method for controlling the same. The electrical bare wire continuous heater comprises: a channel assembly having a water inlet channel and a water outlet channel which are electrically conductive and electrically connected with earth potential, wherein the channel assembly comprises at least one channel which is used for guiding the water and is not electrically conductive, channel end portions of the channel assembly are respectively provided with the water inlet channel and the water outlet channel; electrical bare wire heating devices for heating the water flowing through the channel assembly; and an electronic control device for adjusting heating power of the bare wire heating devices, wherein the control device comprises an electric conductivity measuring device for determining an electric conductivity value of the water flowing through the channel assembly and is characterized that the control device comprises an evaluation unit used for measuring a hypothetical electric leakage current value based on the electric conductivity value and at least one predetermined device parameter which is limited by the structure type, and the control device is configured to reduce the heating power of the bare wire heating devices as long as the hypothetical electric leakage current value exceeds a predetermined electric leakage current threshold value.

Description

technical field [0001] The invention relates to an electric bare-wire continuous heater (Blankdrahtdurchlauferhitzer) for preparing hot water, comprising: a water inlet channel (Wasserzulaufkanal) with an to an external, first water supply line) and an electrically conductive water discharge channel (Wasserablaufkanal) (Wasserablaufkanal) that is electrically conductive and connected to ground potential (which is set up to be connected to an external, second water line that leads out of water) A channel assembly, wherein the channel assembly comprises at least one non-conductive channel leading water, at the channel ends of which a water inlet channel and a water outlet channel are respectively arranged; an electrical bare wire heating for heating the water flowing through the channel assembly is provided device; set up an electronic control device for regulating the heating power of the bare wire heating device, wherein the control device includes a conductivity measuring dev...

AI Technical Summary

Problems solved by technology

[0004] Disadvantageously, with the conductivity measurement of the continuous heater known from document DE 84 28 975 only a lack of water is detected in order to switch off the heating coil in this case and thereby prevent overheating of the heating coil (which may be accompanied by destruction of the heating coil)

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