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3. Control and signalling
The electric boiler is designed for unmanned operation. After switching on of the main power supply switch there
is a green signal light lit on the control panel (see the picture of the control panel) signalling, that the electric boiler
is connected to the mains. The white general remote control LED diode signalizes, that the contactor controlled by
the general remote control is switched on and also signalizes if there is an interruption of the lower tariff of the direct
heating rate. the LED diode is on when the lower tariff is active.
Control panel (Diagram 2)
1. Indicator of boiler water pressure
2. Indicator of heating water temperature
3. Indication of general remote control mode
4. Output level switchControl
5. Wheel of the boiler operating thermostat
6. Indication of boiler connection to the mains
7. Indication of 1st – 3rd output level
8. Indication of boiler overheating and boiler water pressure decrease
Two switches located in the lower part of the control panel allow the user to
choose the output levels
according to the next table:
Output range (kW) 9 12 15 18 21 24
I 00661212
I+II 369121518
I+III 662121818
I+II+III 9 12 15 18 21 24
Lit LED diodes II and III above switches signalize that switches are turned on
and that the appropriate heating elements inside the electric boiler are heating. LED diode I signalizes that the first
output level is switched on and also signalizes the moment when the boiler is switched on/off by the indoor temperature
controller or by a boiler thermostat, when the ripple control is switched on. If there are two or more electric boilers
working in a cascade connection, the second electric boiler always turns on with a delay after switch-on of the
bottom switch of the preceding boiler. Along with the boiler thermostat, the maximum heating water temperature
can be set, heated in the electric boiler. The boiler thermostat has to be set in accordance with the mounting
company instructions, because the maximum heating water temperature depends on the type of heating system
(floor heating, fitting of thermostatic heads, heating of hot water). Please set the indoor temperature controller
according to the user instructions. When using classical central heating with heating bodies and with an indoor
temperature controller it is necessary to set the boiler thermostat to a higher temperature - e.g. to 80 °C. Do not
however be suprised that the water in the heating system will not reach that temperature. The indoor temperature
controller will stabilize the water temperature on a level necessary for reaching the required indoor air temperature.
By setting the boiler thermostat to a higher temperature, prevention of the switch-off of the electric boiler is achieved
when the set temperature of the water is too low so as to not influence indoor temperature room regulation. The
boiler operating thermostat has a limiting function when control is executed in this way.
Output preset value depends on heat loss in your flat or house, on external temperature, on required indoor
temperature, or if you use your electric boiler also for the heating of hot water. Full output operation at temperatures
around or above 0°C will not cause damage to the electric boiler.
When heating two flats it is necessary to set output so as to be sufficient for covering losses for both flats.
The electric boiler is equipped with a safety thermal cut-out – safety thermostat and pressure sensor for securing
of safe operation. The safety thermostat will shut down the boiler irreversibly when the water exceeds the critical
temperature (100 °C). This will be signalized by a yellow signal light. When a reaction of this kind does not occur,
call a service engineer immediately in order to detect the true cause, repair the boiler and put it into operation again.
Annotation: no any time itś must be a warranty revision.
Never try to repair the boiler yourself! This situation is rare and will not be encountered on a regular basis. The
pressure sensor prevents the boiler switch-on if there is a leakage of water from the heating system and if the water
pressure drops below 0,8 Bar, so that the heating elements are protected from damage in case of operation without
Diagram 2
HDO
1
2
3
4
5
6
7
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