5
Safety switch contactor
A safety 3-phase contactor is integrated in the electric power branches on the boiler inlet.
In emergency cases and in other abnormal conditions, the contactor can cut off current from the heating rods,
thus preventing any dangerous situations.
Overheating protection
If the heating water temperature exceeds 95°C, overheating error E.3 is reported. The error will be cleared when
the temperature drops below 91°C.
Uniform load on the heating rods
The principle of uniform load on the heating rods helps to increase their service life. The rod which was
connected first will be the first one to be disconnected in the regulation cycle, which leads to increased overall
reliability and a longer service life of the appliance. The processor evaluates the time of operation of the
individual heating rods and switches them on in such a way so that the boiler (boiler body) is under uniform
thermal load, if possible, and
the rods are under uniform operating load.
Switching system of the boiler by HDO
The THERM ELN boiler signals and responds to commands from the HDO receiver from the external
switchboard. The receiver output shall be a signal connected with the neutral wire which is connected to the
HDO/N terminal. This remote control method makes it possible to operate the boiler when the tariff rate is low,
thus considerably reducing the electricity costs.
!!!
In case of other methods of HDO receiver installation, with a phase (HDO/L1 -L3) as the output, transfer to
the N level (neutral wire) needs to be ensured in the external switchboard by installing an auxiliary relay etc.!!!
Analogue signal control
The heating water output temperature can be controlled within the given range by analogue signal – control
voltage from 0 to 10V.
Auto-diagnostics, clear signals and service messages
The THERM ELN electric boiler features a very useful auto-diagnostics system - especially for service
purposes. This feature helps to eliminate any boiler defects quickly and effectively.
