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The electronic board supplies voltage to the fan's electrical motor 28. The fan starts operating (it can be
5)
heard). By means of air flow a pressure difference is created in the air pressure switch 27. A signal about
draught presence comes to the electronic board 11. If there is no signal, the boiler's launching stops;
A pause for combustion chamber ventilation is held (it is necessary for gas removal in case of previous
6)
failed launching)
The ignition transformer 12 transfers high voltage to the ignition plug 5 on the signal of the electronic
7)
board 11 in~ 10 sec. (a sound of current discharge can be heard);
The electronic board 11 provides a signal for opening the gas valve in the gas supply regulator 9, and
8)
gas comes to the burner block 4;
9) If ignition happened (if the casing is removed, you can see the flame through the glory-hole), an
ionization plug 6 sends a signal to the electronic board about successful ignition. If there is no signal from the
ionization plug, the electronic board 11 repeats the procedure of boiler's launching from the beginning. There
are 2 consecutive launching attempts taken. If both attempts fail, the electronic board stops ignition;
10)The electronic board 11changes voltage in the modulator coil of gas supply regulator 9.The gas
supply regulator increases gas supply to the burner block 4 up to maximal power in order to quickly
warm the heat carrier in the heating system up to the set temperature;
11)The electronic board compares the signal from the CH temperature sensor 16 with the value set by the
user with the buttons К3 and К4 (see p. 3.1, page 8). If the difference of set temperatures is more than 1
°С, the electronic board 11changes voltage on the gas supply regulator 9 in order to change gas supply to
the burner block in accordance with the CH's requirement.
13.4.2 Boiler's operation in DHW mode:
1) DHW flow sensor 23 sends a signal (see p. 13.1, page 27) about presence of water flow in DHW
supply circuit;
2) The electronic board 11 checks the 3 way valve's position;
3) If the 3 way valve18 is in the position, corresponding to the DHW mode, the electronic board supplies
voltage to its electrical motor 19. The electrical motor moves the 3 way valve18 to the position
corresponding to the DHW supply mode. As a result the heat carrier from the primary heat exchanger
is directed to the secondary heat exchanger 3, providing the DHW supply mode this way;
4) The electronic board provides voltage to the pump 7 (voltage presence on the pump's terminals can
be checked with a tester).The pump starts operating (the sound of operating pump can be heard);
5) The electronic board inquires the air pressure switch 27, its contacts must be opened. If the contacts
are closed, the boiler's launching stops;
6) The electronic board provides voltage to the fan's electric motor 28. The fans starts operating (it can
be heard). By means of air flow a pressure difference is created in the air pressure switch 27. A signal
about draught presence comes to the electronic board 11. If there is no signal, the boiler's launching
stops;
7) A pause for combustion chamber ventilation is held (it is necessary for gas removal in case of
previous failed launching);
8) The ignition transformer 12 transfers high voltage to the ignition plug 5 on the signal of the
electronic board in~ 10 sec. (a sound of current discharge can be heard);
9) The electronic board provides a signal for opening the gas valve in the gas supply regulator 9, and
gas comes to the burner block 4;
10)
If ignition happened (if the casing is removed, you can see the flame through the glory-hole),
the ionization plug 6 sends a signal to the electronic board about successful ignition. If there is no
signal from the ionization plug, the electronic board repeats the procedure of boiler's launching from
the beginning. There are 2 consecutive launching attempts taken. If both attempts fail, the electronic
board stops ignition;
11)
The electronic board changes voltage in the modulator coil of gas supply regulator 9.The gas
supply regulator increases gas supply to the burner block up to maximal power in order to quickly
warm the water in the DHW supply system up;
12)
The electronic board compares the signal from the DHW temperature sensor 17 with the value
set by the user with the buttons К1 and К2 (see p. 3.1, page 8). If the difference of set temperatures is
more than 1 °С, the electronic board changes voltage on the gas supply regulator in order to change
gas supply to the burner block in accordance with the CH's requirement.
13.4.3 Boiler's operation in combined mode
In this mode the DHW supply has a priority over heating. In case of no water flow on the DHW supply
line the boiler operates in the heating mode.
If there is water flow in the DHW supply line:
-
DHW flow sensor 23 actuates (see p. 13.1, page 27). A signal about presence of water flow in the
DHW is sent to the electronic board;
-
The electronic board supplies voltage to the electric motor 19 of the 3 way valve18.
- The electric motor moves the 3 way valve18. As a result the heat carrier from the primary heat
exchanger is directed to the secondary heat exchanger 3, providing the DHW priority this way (water
inlet into the heating system is blocked during all the period of water withdrawal in the DHW system).
When water flow in the DHW line stops (there is no signal from DHW flow sensor 23) the boiler is
rendered to the heating mode ( the electronic board supplies voltage to the electric motor and it moves the 3
way valveto the position for the heating mode).
Руководство для технического персонала
32
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