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1.7.5 Safety function of the boiler
1.7 Description of function
Control unit
1.7.1 Technical description The control unit is designed according to valid EU
The boiler is designed according to valid norms and rules norms and is certified.
ČSN EN and IEC. The safety of the boiler, energy saving The control unit has a protection against below and
and sound was important matter during the boiler over voltage
designing. The control unit is protected by system Watch Dog-
Timer with time 512 ms against its processor
1.7.2 Principle of boiler operation “blocking”. In case that the processor is blocking the
IThe insulated boiler body with volume is a reservoir automatic reset function is activated and then the
where water is heated by electric heating elements. In program is going with all parameters set from the point
dependency of heat request there are connected 1 = 2, 5 where it was broken.
kW, 2 = 5 kW or 3 = 7, 5 kW heating elements.
Circulation of water is through the pump. Safety of boiler Protection against overheating
operation is monitoring by several independent sensors. The boiler has a emergency thermostat set for 100° C.
Whole heating process and pump operation is controlled In case of boiler overheating heating elements are put
by the control unit with display and push touch buttons. out of operation independently to the control unit. This
The button 0/1 is for switching off the boiler out of breakdown is signalling on the display as E2. This
operation . breakdown could be repaired only by authorized
service man.
1.7.3 Control unit and control boardControl
Protection against lost of heating water
unit has several functions which assure basic
pressure
characteristics, mainly:
The boiler is equipped with a pressure switcher which
safety functions assure protection against the
detriment of health and property control minimal pressure in heating system 0,4 bar,
user´s functions functions set by user when the function reliability of deaerate valves is
operation functions internal functions of control unit assured, it means that the boiler has sufficient volume
import for sound operation of the boiler, but un-get-at- of water.
able for user In case of lost of heating water pressure below 0,4 bar
Control unit works with below mentioned inlet signals: the boiler signs the breakdown E3 and heating
temperature of heating water (sensor NTC) elements are put out of operation independently to the
minimal operation pressure (switcher 230 V) control unit.
maximal operation pressure (switcher 230 V) This breakdown could be repaired after the control of
room thermostat (switcher 24 V) tightness of water ways and after water filling over 0,4
request service utility water (switcher 230 V). bar. After that the boiler is automatically reset and
Control unit controls: returned to normal operation.
3 heating elements
pump operation Boiler protection against over and below voltage
in supply electrical net
1.7.4 Protection function of boiler The control unit is equipped with function assuring
putting the boiler out of operation if the voltage is
Antifreeze protection of the boiler below 150 V or over 250 V. This stage is marked on the
This function protects the boiler against freeze and is display with the blinking point in the low right corner of
active in the mode STAND-BY. the display.
Circulation pump and the boiler are in operation, if When the voltage is OK = in the scale 150 250 V then
temperature of heating water decreases below C. In the boiler returns to normal operation.
this case the boiler assures minimal level of heating
and the system is mildly warm, the boiler heats to 15° Boiler protection against overpressure of
C temperature of heating water and after that the heating water
boiler set back to mode that it start to operate from. The boiler pump is equipped with pressure safety valve
If the boiler is switch off or out of electric supply, this set for 3 bars. In case of the overpressure more than 3
function is not active. bars the leakage of water occurs from the valve till the
pressure of water in heating system is not below
Unlocking protection of heating system maximal requested level.
It is active at all times if the circulation pump or 3-ways This valve is in its operation automatically.
valve is more than 24 hours out off operation to protect
blocking of the pump or the valve due to its small parts.
This function avoids blocking of the pump rotor in
mode STAND-BY and elongates its lifetime.
The pump works 1 per day for 10 s.
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