Boiler Elterm 15/9 kw from 2000 - instruction and principle of operation

Does anyone have knowledge or a diagram of all electrical equipment, a boiler with connecting wires to switches and contactors (I found a diagram of the controller itself). I bought such a boiler for emergency heating of the house, but all the wires and cubes are damaged. I checked the heaters briefly and they work. Does anyone know how this stove behaves after reaching the required temperature, how it turns on the pump, how it turns on and when it is more or less powerful. Maybe some instruction with the principle of operation? Thanks in advance for your help.

Some time passed, I repaired the furnace, the transformer and one of the two thermal switches were damaged.
The stove is connected to the central heating installation and it works, but I do not fully understand its operation when it reaches the set temperature on the boiler.
Namely, it turns off and after 30 seconds it turns off the central heating pump and there is a stoppage until the temperature on the stove drops and turns on again. Downtimes are longer than the heating time, so that the radiators heat up, cool down again and the temperature does not necessarily rise at home. It could be so, if the temperature in the house was obtained, then this furnace could maintain it.
The question is, has anyone dealt with such a boiler?
I partially explained to myself, the mixing valve was set to 3, I changed it to 5 and at home 23 * C, but something does not work with the room thermostat because whether the thermostat is on or off, the stove works the same.
Does anyone have any idea with this thermostat? I would probably save a lot, because the room thermostat does not disconnect the stove despite the fact that the temperature is reached.

Someone will probably think that Azuks is a strange guy. Sam started the post and replies in it.
I came m with a room thermostat, the previous owner made a bridge in the plug to the room controller (maybe it had a damaged one) and the stove was heating all the time. I removed the bridge and the boiler responds to the room controller, now I will be able to assess what costs I will incur by heating the house electrically.
It is a plug of this kind, the second fourth and fifth ache were blocked. I only left 2 of 4 blocked.