5
5. After the blow-off is finished, the control chamber sends a signal to start ignition and opens
the electromagnetic valve for compressed air line 1. The air goes through the filter
separating moisture that has a pressure regulator and manometer. The amount of
pressure for primary air of line 1 is set within 0.15 - 0.4 MPa.
6. While going through the nozzle primary air causes vacuum on the fuel line and it starts
sucking the heated fuel from the preliminary heater.
7. In the flow of primary air the fuel gets atomized (becomes finely dispersed) and mixes up
with a swirled flow of secondary air.
8. The spark sent to the ignition electrodes inflames air and fuel mix. The photocell marks the
presence of flame, and the ignition process begins.
9. After a while the control chamber sends a signal to open the electromagnetic valve of line
2 (not in NORTEC WB 60/120 burners) and the burner starts working at full power.
10. For models NORTEC WB 60/120 full power of a burner is shown by the amount of primary
air pressure in line 1, and for models NORTEC WB 230/270 it is shown by the amount of
pressure in both inlets.
11. If the fuel level in the preliminary heater gets lower a certain level, the float goes down and
blocks the pump contact. The fuel is added in the heater.
12. If the flame goes out when the fuel runs out because of too high primary air pressure or
due to other reasons, the photocell switches the burner off and the error signal turns on.
Manual restart is needed.
13. If the temperature of the fuel in the heater is lower than it was given on the thermostat, the
burner stops working and heats the fuel up to the given temperature. The restart is
automatic.
4. Design, main elements and sizes of NORTEC WB burners
Pic.3 NORTEC WB burners elements
Pic.4 NORTEC WB burners dimensions
